[457] | 1 | /**
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| 2 | * @file
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| 3 | * SMTP client module
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| 4 | *
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| 5 | * Author: Simon Goldschmidt
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| 6 | *
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| 7 | * @defgroup smtp SMTP client
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| 8 | * @ingroup apps
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| 9 | *
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| 10 | * This is simple SMTP client for raw API.
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| 11 | * It is a minimal implementation of SMTP as specified in RFC 5321.
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| 12 | *
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| 13 | * Example usage:
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| 14 | @code{.c}
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| 15 | void my_smtp_result_fn(void *arg, u8_t smtp_result, u16_t srv_err, err_t err)
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| 16 | {
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| 17 | printf("mail (%p) sent with results: 0x%02x, 0x%04x, 0x%08x\n", arg,
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| 18 | smtp_result, srv_err, err);
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| 19 | }
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| 20 | static void my_smtp_test(void)
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| 21 | {
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| 22 | smtp_set_server_addr("mymailserver.org");
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| 23 | -> set both username and password as NULL if no auth needed
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| 24 | smtp_set_auth("username", "password");
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| 25 | smtp_send_mail("sender", "recipient", "subject", "body", my_smtp_result_fn,
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| 26 | some_argument);
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| 27 | }
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| 28 | @endcode
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| 29 |
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| 30 | * When using from any other thread than the tcpip_thread (for NO_SYS==0), use
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| 31 | * smtp_send_mail_int()!
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| 32 | *
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| 33 | * SMTP_BODYDH usage:
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| 34 | @code{.c}
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| 35 | int my_smtp_bodydh_fn(void *arg, struct smtp_bodydh *bdh)
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| 36 | {
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| 37 | if(bdh->state >= 10) {
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| 38 | return BDH_DONE;
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| 39 | }
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| 40 | sprintf(bdh->buffer,"Line #%2d\r\n",bdh->state);
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| 41 | bdh->length = strlen(bdh->buffer);
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| 42 | ++bdh->state;
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| 43 | return BDH_WORKING;
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| 44 | }
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| 45 |
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| 46 | smtp_send_mail_bodycback("sender", "recipient", "subject",
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| 47 | my_smtp_bodydh_fn, my_smtp_result_fn, some_argument);
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| 48 | @endcode
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| 49 | *
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| 50 | * @todo:
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| 51 | * - attachments (the main difficulty here is streaming base64-encoding to
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| 52 | * prevent having to allocate a buffer for the whole encoded file at once)
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| 53 | * - test with more mail servers...
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| 54 | *
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| 55 | */
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| 56 |
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| 57 | #include "lwip/apps/smtp.h"
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| 58 |
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| 59 | #if LWIP_TCP && LWIP_CALLBACK_API
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| 60 | #include "lwip/sys.h"
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| 61 | #include "lwip/sockets.h"
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| 62 | #include "lwip/altcp.h"
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| 63 | #include "lwip/dns.h"
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| 64 | #include "lwip/mem.h"
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| 65 | #include "lwip/altcp_tcp.h"
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| 66 | #include "lwip/altcp_tls.h"
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| 67 |
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| 68 | #include <string.h> /* strlen, memcpy */
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| 69 | #include <stdlib.h>
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| 70 |
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| 71 | /** TCP poll interval. Unit is 0.5 sec. */
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| 72 | #define SMTP_POLL_INTERVAL 4
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| 73 | /** TCP poll timeout while sending message body, reset after every
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| 74 | * successful write. 3 minutes */
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| 75 | #define SMTP_TIMEOUT_DATABLOCK ( 3 * 60 * SMTP_POLL_INTERVAL / 2)
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| 76 | /** TCP poll timeout while waiting for confirmation after sending the body.
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| 77 | * 10 minutes */
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| 78 | #define SMTP_TIMEOUT_DATATERM (10 * 60 * SMTP_POLL_INTERVAL / 2)
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| 79 | /** TCP poll timeout while not sending the body.
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| 80 | * This is somewhat lower than the RFC states (5 minutes for initial, MAIL
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| 81 | * and RCPT) but still OK for us here.
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| 82 | * 2 minutes */
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| 83 | #define SMTP_TIMEOUT ( 2 * 60 * SMTP_POLL_INTERVAL / 2)
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| 84 |
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| 85 | /* the various debug levels for this file */
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| 86 | #define SMTP_DEBUG_TRACE (SMTP_DEBUG | LWIP_DBG_TRACE)
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| 87 | #define SMTP_DEBUG_STATE (SMTP_DEBUG | LWIP_DBG_STATE)
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| 88 | #define SMTP_DEBUG_WARN (SMTP_DEBUG | LWIP_DBG_LEVEL_WARNING)
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| 89 | #define SMTP_DEBUG_WARN_STATE (SMTP_DEBUG | LWIP_DBG_LEVEL_WARNING | LWIP_DBG_STATE)
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| 90 | #define SMTP_DEBUG_SERIOUS (SMTP_DEBUG | LWIP_DBG_LEVEL_SERIOUS)
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| 91 |
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| 92 |
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| 93 | #define SMTP_RX_BUF_LEN 255
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| 94 | #define SMTP_TX_BUF_LEN 255
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| 95 | #define SMTP_CRLF "\r\n"
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| 96 | #define SMTP_CRLF_LEN 2
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| 97 |
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| 98 | #define SMTP_RESP_220 "220"
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| 99 | #define SMTP_RESP_235 "235"
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| 100 | #define SMTP_RESP_250 "250"
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| 101 | #define SMTP_RESP_334 "334"
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| 102 | #define SMTP_RESP_354 "354"
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| 103 | #define SMTP_RESP_LOGIN_UNAME "VXNlcm5hbWU6"
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| 104 | #define SMTP_RESP_LOGIN_PASS "UGFzc3dvcmQ6"
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| 105 |
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| 106 | #define SMTP_KEYWORD_AUTH_SP "AUTH "
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| 107 | #define SMTP_KEYWORD_AUTH_EQ "AUTH="
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| 108 | #define SMTP_KEYWORD_AUTH_LEN 5
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| 109 | #define SMTP_AUTH_PARAM_PLAIN "PLAIN"
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| 110 | #define SMTP_AUTH_PARAM_LOGIN "LOGIN"
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| 111 |
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| 112 | #define SMTP_CMD_EHLO_1 "EHLO ["
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| 113 | #define SMTP_CMD_EHLO_1_LEN 6
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| 114 | #define SMTP_CMD_EHLO_2 "]\r\n"
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| 115 | #define SMTP_CMD_EHLO_2_LEN 3
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| 116 | #define SMTP_CMD_AUTHPLAIN_1 "AUTH PLAIN "
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| 117 | #define SMTP_CMD_AUTHPLAIN_1_LEN 11
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| 118 | #define SMTP_CMD_AUTHPLAIN_2 "\r\n"
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| 119 | #define SMTP_CMD_AUTHPLAIN_2_LEN 2
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| 120 | #define SMTP_CMD_AUTHLOGIN "AUTH LOGIN\r\n"
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| 121 | #define SMTP_CMD_AUTHLOGIN_LEN 12
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| 122 | #define SMTP_CMD_MAIL_1 "MAIL FROM: <"
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| 123 | #define SMTP_CMD_MAIL_1_LEN 12
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| 124 | #define SMTP_CMD_MAIL_2 ">\r\n"
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| 125 | #define SMTP_CMD_MAIL_2_LEN 3
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| 126 | #define SMTP_CMD_RCPT_1 "RCPT TO: <"
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| 127 | #define SMTP_CMD_RCPT_1_LEN 10
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| 128 | #define SMTP_CMD_RCPT_2 ">\r\n"
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| 129 | #define SMTP_CMD_RCPT_2_LEN 3
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| 130 | #define SMTP_CMD_DATA "DATA\r\n"
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| 131 | #define SMTP_CMD_DATA_LEN 6
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| 132 | #define SMTP_CMD_HEADER_1 "From: <"
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| 133 | #define SMTP_CMD_HEADER_1_LEN 7
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| 134 | #define SMTP_CMD_HEADER_2 ">\r\nTo: <"
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| 135 | #define SMTP_CMD_HEADER_2_LEN 8
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| 136 | #define SMTP_CMD_HEADER_3 ">\r\nSubject: "
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| 137 | #define SMTP_CMD_HEADER_3_LEN 12
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| 138 | #define SMTP_CMD_HEADER_4 "\r\n\r\n"
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| 139 | #define SMTP_CMD_HEADER_4_LEN 4
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| 140 | #define SMTP_CMD_BODY_FINISHED "\r\n.\r\n"
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| 141 | #define SMTP_CMD_BODY_FINISHED_LEN 5
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| 142 | #define SMTP_CMD_QUIT "QUIT\r\n"
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| 143 | #define SMTP_CMD_QUIT_LEN 6
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| 144 |
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| 145 | #if defined(SMTP_STAT_TX_BUF_MAX) && SMTP_STAT_TX_BUF_MAX
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| 146 | #define SMTP_TX_BUF_MAX(len) LWIP_MACRO(if((len) > smtp_tx_buf_len_max) smtp_tx_buf_len_max = (len);)
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| 147 | #else /* SMTP_STAT_TX_BUF_MAX */
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| 148 | #define SMTP_TX_BUF_MAX(len)
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| 149 | #endif /* SMTP_STAT_TX_BUF_MAX */
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| 150 |
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| 151 | #if SMTP_COPY_AUTHDATA
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| 152 | #define SMTP_USERNAME(session) (session)->username
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| 153 | #define SMTP_PASS(session) (session)->pass
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| 154 | #define SMTP_AUTH_PLAIN_DATA(session) (session)->auth_plain
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| 155 | #define SMTP_AUTH_PLAIN_LEN(session) (session)->auth_plain_len
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| 156 | #else /* SMTP_COPY_AUTHDATA */
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| 157 | #define SMTP_USERNAME(session) smtp_username
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| 158 | #define SMTP_PASS(session) smtp_pass
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| 159 | #define SMTP_AUTH_PLAIN_DATA(session) smtp_auth_plain
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| 160 | #define SMTP_AUTH_PLAIN_LEN(session) smtp_auth_plain_len
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| 161 | #endif /* SMTP_COPY_AUTHDATA */
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| 162 |
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| 163 | #if SMTP_BODYDH
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| 164 | #ifndef SMTP_BODYDH_MALLOC
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| 165 | #define SMTP_BODYDH_MALLOC(size) mem_malloc(size)
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| 166 | #define SMTP_BODYDH_FREE(ptr) mem_free(ptr)
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| 167 | #endif
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| 168 |
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| 169 | /* Some internal state return values */
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| 170 | #define BDHALLDATASENT 2
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| 171 | #define BDHSOMEDATASENT 1
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| 172 |
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| 173 | enum bdh_handler_state {
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| 174 | BDH_SENDING, /* Serving the user function generating body content */
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| 175 | BDH_STOP /* User function stopped, closing */
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| 176 | };
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| 177 | #endif
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| 178 |
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| 179 | /** State for SMTP client state machine */
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| 180 | enum smtp_session_state {
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| 181 | SMTP_NULL,
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| 182 | SMTP_HELO,
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| 183 | SMTP_AUTH_PLAIN,
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| 184 | SMTP_AUTH_LOGIN_UNAME,
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| 185 | SMTP_AUTH_LOGIN_PASS,
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| 186 | SMTP_AUTH_LOGIN,
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| 187 | SMTP_MAIL,
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| 188 | SMTP_RCPT,
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| 189 | SMTP_DATA,
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| 190 | SMTP_BODY,
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| 191 | SMTP_QUIT,
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| 192 | SMTP_CLOSED
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| 193 | };
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| 194 |
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| 195 | #ifdef LWIP_DEBUG
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| 196 | /** State-to-string table for debugging */
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| 197 | static const char *smtp_state_str[] = {
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| 198 | "SMTP_NULL",
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| 199 | "SMTP_HELO",
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| 200 | "SMTP_AUTH_PLAIN",
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| 201 | "SMTP_AUTH_LOGIN_UNAME",
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| 202 | "SMTP_AUTH_LOGIN_PASS",
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| 203 | "SMTP_AUTH_LOGIN",
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| 204 | "SMTP_MAIL",
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| 205 | "SMTP_RCPT",
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| 206 | "SMTP_DATA",
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| 207 | "SMTP_BODY",
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| 208 | "SMTP_QUIT",
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| 209 | "SMTP_CLOSED",
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| 210 | };
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| 211 |
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| 212 | static const char *smtp_result_strs[] = {
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| 213 | "SMTP_RESULT_OK",
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| 214 | "SMTP_RESULT_ERR_UNKNOWN",
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| 215 | "SMTP_RESULT_ERR_CONNECT",
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| 216 | "SMTP_RESULT_ERR_HOSTNAME",
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| 217 | "SMTP_RESULT_ERR_CLOSED",
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| 218 | "SMTP_RESULT_ERR_TIMEOUT",
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| 219 | "SMTP_RESULT_ERR_SVR_RESP",
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| 220 | "SMTP_RESULT_ERR_MEM"
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| 221 | };
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| 222 | #endif /* LWIP_DEBUG */
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| 223 |
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| 224 | #if SMTP_BODYDH
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| 225 | struct smtp_bodydh_state {
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| 226 | smtp_bodycback_fn callback_fn; /* The function to call (again) */
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| 227 | u16_t state;
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| 228 | struct smtp_bodydh exposed; /* the user function structure */
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| 229 | };
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| 230 | #endif /* SMTP_BODYDH */
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| 231 |
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| 232 | /** struct keeping the body and state of an smtp session */
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| 233 | struct smtp_session {
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| 234 | /** keeping the state of the smtp session */
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| 235 | enum smtp_session_state state;
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| 236 | /** timeout handling, if this reaches 0, the connection is closed */
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| 237 | u16_t timer;
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| 238 | /** helper buffer for transmit, not used for sending body */
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| 239 | char tx_buf[SMTP_TX_BUF_LEN + 1];
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| 240 | struct pbuf* p;
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| 241 | /** source email address */
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| 242 | const char* from;
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| 243 | /** size of the sourceemail address */
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| 244 | u16_t from_len;
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| 245 | /** target email address */
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| 246 | const char* to;
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| 247 | /** size of the target email address */
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| 248 | u16_t to_len;
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| 249 | /** subject of the email */
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| 250 | const char *subject;
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| 251 | /** length of the subject string */
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| 252 | u16_t subject_len;
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| 253 | /** this is the body of the mail to be sent */
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| 254 | const char* body;
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| 255 | /** this is the length of the body to be sent */
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| 256 | u16_t body_len;
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| 257 | /** amount of data from body already sent */
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| 258 | u16_t body_sent;
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| 259 | /** callback function to call when closed */
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| 260 | smtp_result_fn callback_fn;
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| 261 | /** argument for callback function */
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| 262 | void *callback_arg;
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| 263 | #if SMTP_COPY_AUTHDATA
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| 264 | /** Username to use for this request */
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| 265 | char *username;
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| 266 | /** Password to use for this request */
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| 267 | char *pass;
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| 268 | /** Username and password combined as necessary for PLAIN authentication */
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| 269 | char auth_plain[SMTP_MAX_USERNAME_LEN + SMTP_MAX_PASS_LEN + 3];
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| 270 | /** Length of smtp_auth_plain string (cannot use strlen since it includes \0) */
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| 271 | size_t auth_plain_len;
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| 272 | #endif /* SMTP_COPY_AUTHDATA */
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| 273 | #if SMTP_BODYDH
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| 274 | struct smtp_bodydh_state *bodydh;
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| 275 | #endif /* SMTP_BODYDH */
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| 276 | };
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| 277 |
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| 278 | /** IP address or DNS name of the server to use for next SMTP request */
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| 279 | static char smtp_server[SMTP_MAX_SERVERNAME_LEN + 1];
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| 280 | /** TCP port of the server to use for next SMTP request */
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| 281 | static u16_t smtp_server_port = SMTP_DEFAULT_PORT;
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| 282 | #if LWIP_ALTCP && LWIP_ALTCP_TLS
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| 283 | /** If this is set, mail is sent using SMTPS */
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| 284 | static struct altcp_tls_config *smtp_server_tls_config;
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| 285 | #endif
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| 286 | /** Username to use for the next SMTP request */
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| 287 | static char *smtp_username;
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| 288 | /** Password to use for the next SMTP request */
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| 289 | static char *smtp_pass;
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| 290 | /** Username and password combined as necessary for PLAIN authentication */
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| 291 | static char smtp_auth_plain[SMTP_MAX_USERNAME_LEN + SMTP_MAX_PASS_LEN + 3];
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| 292 | /** Length of smtp_auth_plain string (cannot use strlen since it includes \0) */
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| 293 | static size_t smtp_auth_plain_len;
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| 294 |
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| 295 | #if SMTP_CHECK_DATA
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| 296 | static err_t smtp_verify(const char *data, size_t data_len, u8_t linebreaks_allowed);
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| 297 | #endif /* SMTP_CHECK_DATA */
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| 298 | static err_t smtp_tcp_recv(void *arg, struct altcp_pcb *pcb, struct pbuf *p, err_t err);
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| 299 | static void smtp_tcp_err(void *arg, err_t err);
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| 300 | static err_t smtp_tcp_poll(void *arg, struct altcp_pcb *pcb);
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| 301 | static err_t smtp_tcp_sent(void *arg, struct altcp_pcb *pcb, u16_t len);
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| 302 | static err_t smtp_tcp_connected(void *arg, struct altcp_pcb *pcb, err_t err);
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| 303 | #if LWIP_DNS
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| 304 | static void smtp_dns_found(const char* hostname, const ip_addr_t *ipaddr, void *arg);
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| 305 | #endif /* LWIP_DNS */
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| 306 | #if SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN
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| 307 | static size_t smtp_base64_encode(char* target, size_t target_len, const char* source, size_t source_len);
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| 308 | #endif /* SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN */
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| 309 | static enum smtp_session_state smtp_prepare_mail(struct smtp_session *s, u16_t *tx_buf_len);
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| 310 | static void smtp_send_body(struct smtp_session *s, struct altcp_pcb *pcb);
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| 311 | static void smtp_process(void *arg, struct altcp_pcb *pcb, struct pbuf *p);
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| 312 | #if SMTP_BODYDH
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| 313 | static void smtp_send_body_data_handler(struct smtp_session *s, struct altcp_pcb *pcb);
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| 314 | #endif /* SMTP_BODYDH */
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| 315 |
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| 316 |
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| 317 | #ifdef LWIP_DEBUG
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| 318 | /** Convert an smtp result to a string */
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| 319 | const char*
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| 320 | smtp_result_str(u8_t smtp_result)
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| 321 | {
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| 322 | if (smtp_result >= LWIP_ARRAYSIZE(smtp_result_strs)) {
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| 323 | return "UNKNOWN";
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| 324 | }
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| 325 | return smtp_result_strs[smtp_result];
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| 326 | }
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| 327 |
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| 328 | /** Null-terminates the payload of p for printing out messages.
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| 329 | * WARNING: use this only if p is not needed any more as the last byte of
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| 330 | * payload is deleted!
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| 331 | */
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| 332 | static const char*
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| 333 | smtp_pbuf_str(struct pbuf* p)
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| 334 | {
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| 335 | if ((p == NULL) || (p->len == 0)) {
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| 336 | return "";
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| 337 | }
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| 338 | ((char*)p->payload)[p->len] = 0;
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| 339 | return (const char*)p->payload;
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| 340 | }
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| 341 | #endif /* LWIP_DEBUG */
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| 342 |
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| 343 | /** @ingroup smtp
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| 344 | * Set IP address or DNS name for next SMTP connection
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| 345 | *
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| 346 | * @param server IP address (in ASCII representation) or DNS name of the server
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| 347 | */
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| 348 | err_t
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| 349 | smtp_set_server_addr(const char* server)
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| 350 | {
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| 351 | size_t len = 0;
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| 352 |
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| 353 | LWIP_ASSERT_CORE_LOCKED();
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| 354 |
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| 355 | if (server != NULL) {
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| 356 | /* strlen: returns length WITHOUT terminating 0 byte */
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| 357 | len = strlen(server);
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| 358 | }
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| 359 | if (len > SMTP_MAX_SERVERNAME_LEN) {
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| 360 | return ERR_MEM;
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| 361 | }
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| 362 | if (len != 0) {
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| 363 | MEMCPY(smtp_server, server, len);
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| 364 | }
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| 365 | smtp_server[len] = 0; /* always OK because of smtp_server[SMTP_MAX_SERVERNAME_LEN + 1] */
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| 366 | return ERR_OK;
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| 367 | }
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| 368 |
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| 369 | /** @ingroup smtp
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| 370 | * Set TCP port for next SMTP connection
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| 371 | *
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| 372 | * @param port TCP port
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| 373 | */
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| 374 | void
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| 375 | smtp_set_server_port(u16_t port)
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| 376 | {
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| 377 | LWIP_ASSERT_CORE_LOCKED();
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| 378 | smtp_server_port = port;
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| 379 | }
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| 380 |
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| 381 | #if LWIP_ALTCP && LWIP_ALTCP_TLS
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| 382 | /** @ingroup smtp
|
---|
| 383 | * Set TLS configuration for next SMTP connection
|
---|
| 384 | *
|
---|
| 385 | * @param tls_config TLS configuration
|
---|
| 386 | */
|
---|
| 387 | void
|
---|
| 388 | smtp_set_tls_config(struct altcp_tls_config *tls_config)
|
---|
| 389 | {
|
---|
| 390 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 391 | smtp_server_tls_config = tls_config;
|
---|
| 392 | }
|
---|
| 393 | #endif
|
---|
| 394 |
|
---|
| 395 | /** @ingroup smtp
|
---|
| 396 | * Set authentication parameters for next SMTP connection
|
---|
| 397 | *
|
---|
| 398 | * @param username login name as passed to the server
|
---|
| 399 | * @param pass password passed to the server together with username
|
---|
| 400 | */
|
---|
| 401 | err_t
|
---|
| 402 | smtp_set_auth(const char* username, const char* pass)
|
---|
| 403 | {
|
---|
| 404 | size_t uname_len = 0;
|
---|
| 405 | size_t pass_len = 0;
|
---|
| 406 |
|
---|
| 407 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 408 |
|
---|
| 409 | memset(smtp_auth_plain, 0xfa, 64);
|
---|
| 410 | if (username != NULL) {
|
---|
| 411 | uname_len = strlen(username);
|
---|
| 412 | if (uname_len > SMTP_MAX_USERNAME_LEN) {
|
---|
| 413 | LWIP_DEBUGF(SMTP_DEBUG_SERIOUS, ("Username is too long, %d instead of %d\n",
|
---|
| 414 | (int)uname_len, SMTP_MAX_USERNAME_LEN));
|
---|
| 415 | return ERR_ARG;
|
---|
| 416 | }
|
---|
| 417 | }
|
---|
| 418 | if (pass != NULL) {
|
---|
| 419 | #if SMTP_SUPPORT_AUTH_LOGIN || SMTP_SUPPORT_AUTH_PLAIN
|
---|
| 420 | pass_len = strlen(pass);
|
---|
| 421 | if (pass_len > SMTP_MAX_PASS_LEN) {
|
---|
| 422 | LWIP_DEBUGF(SMTP_DEBUG_SERIOUS, ("Password is too long, %d instead of %d\n",
|
---|
| 423 | (int)uname_len, SMTP_MAX_USERNAME_LEN));
|
---|
| 424 | return ERR_ARG;
|
---|
| 425 | }
|
---|
| 426 | #else /* SMTP_SUPPORT_AUTH_LOGIN || SMTP_SUPPORT_AUTH_PLAIN */
|
---|
| 427 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("Password not supported as no authentication methods are activated\n"));
|
---|
| 428 | #endif /* SMTP_SUPPORT_AUTH_LOGIN || SMTP_SUPPORT_AUTH_PLAIN */
|
---|
| 429 | }
|
---|
| 430 | *smtp_auth_plain = 0;
|
---|
| 431 | if (username != NULL) {
|
---|
| 432 | smtp_username = smtp_auth_plain + 1;
|
---|
| 433 | strcpy(smtp_username, username);
|
---|
| 434 | }
|
---|
| 435 | if (pass != NULL) {
|
---|
| 436 | smtp_pass = smtp_auth_plain + uname_len + 2;
|
---|
| 437 | strcpy(smtp_pass, pass);
|
---|
| 438 | }
|
---|
| 439 | smtp_auth_plain_len = uname_len + pass_len + 2;
|
---|
| 440 |
|
---|
| 441 | return ERR_OK;
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 | #if SMTP_BODYDH
|
---|
| 445 | static void smtp_free_struct(struct smtp_session *s)
|
---|
| 446 | {
|
---|
| 447 | if (s->bodydh != NULL) {
|
---|
| 448 | SMTP_BODYDH_FREE(s->bodydh);
|
---|
| 449 | }
|
---|
| 450 | SMTP_STATE_FREE(s);
|
---|
| 451 | }
|
---|
| 452 | #else /* SMTP_BODYDH */
|
---|
| 453 | #define smtp_free_struct(x) SMTP_STATE_FREE(x)
|
---|
| 454 | #endif /* SMTP_BODYDH */
|
---|
| 455 |
|
---|
| 456 | static struct altcp_pcb*
|
---|
| 457 | smtp_setup_pcb(struct smtp_session *s, const ip_addr_t* remote_ip)
|
---|
| 458 | {
|
---|
| 459 | struct altcp_pcb* pcb;
|
---|
| 460 | LWIP_UNUSED_ARG(remote_ip);
|
---|
| 461 |
|
---|
| 462 | #if LWIP_ALTCP && LWIP_ALTCP_TLS
|
---|
| 463 | if (smtp_server_tls_config) {
|
---|
| 464 | pcb = altcp_tls_new(smtp_server_tls_config, IP_GET_TYPE(remote_ip));
|
---|
| 465 | } else
|
---|
| 466 | #endif
|
---|
| 467 | {
|
---|
| 468 | pcb = altcp_tcp_new_ip_type(IP_GET_TYPE(remote_ip));
|
---|
| 469 | }
|
---|
| 470 | if (pcb != NULL) {
|
---|
| 471 | altcp_arg(pcb, s);
|
---|
| 472 | altcp_recv(pcb, smtp_tcp_recv);
|
---|
| 473 | altcp_err(pcb, smtp_tcp_err);
|
---|
| 474 | altcp_poll(pcb, smtp_tcp_poll, SMTP_POLL_INTERVAL);
|
---|
| 475 | altcp_sent(pcb, smtp_tcp_sent);
|
---|
| 476 | }
|
---|
| 477 | return pcb;
|
---|
| 478 | }
|
---|
| 479 |
|
---|
| 480 | /** The actual mail-sending function, called by smtp_send_mail and
|
---|
| 481 | * smtp_send_mail_static after setting up the struct smtp_session.
|
---|
| 482 | */
|
---|
| 483 | static err_t
|
---|
| 484 | smtp_send_mail_alloced(struct smtp_session *s)
|
---|
| 485 | {
|
---|
| 486 | err_t err;
|
---|
| 487 | struct altcp_pcb* pcb = NULL;
|
---|
| 488 | ip_addr_t addr;
|
---|
| 489 |
|
---|
| 490 | LWIP_ASSERT("no smtp_session supplied", s != NULL);
|
---|
| 491 |
|
---|
| 492 | #if SMTP_CHECK_DATA
|
---|
| 493 | /* check that body conforms to RFC:
|
---|
| 494 | * - convert all single-CR or -LF in body to CRLF
|
---|
| 495 | * - only 7-bit ASCII is allowed
|
---|
| 496 | */
|
---|
| 497 | if (smtp_verify(s->to, s->to_len, 0) != ERR_OK) {
|
---|
| 498 | err = ERR_ARG;
|
---|
| 499 | goto leave;
|
---|
| 500 | }
|
---|
| 501 | if (smtp_verify(s->from, s->from_len, 0) != ERR_OK) {
|
---|
| 502 | err = ERR_ARG;
|
---|
| 503 | goto leave;
|
---|
| 504 | }
|
---|
| 505 | if (smtp_verify(s->subject, s->subject_len, 0) != ERR_OK) {
|
---|
| 506 | err = ERR_ARG;
|
---|
| 507 | goto leave;
|
---|
| 508 | }
|
---|
| 509 | #if SMTP_BODYDH
|
---|
| 510 | if (s->bodydh == NULL)
|
---|
| 511 | #endif /* SMTP_BODYDH */
|
---|
| 512 | {
|
---|
| 513 | if (smtp_verify(s->body, s->body_len, 0) != ERR_OK) {
|
---|
| 514 | err = ERR_ARG;
|
---|
| 515 | goto leave;
|
---|
| 516 | }
|
---|
| 517 | }
|
---|
| 518 | #endif /* SMTP_CHECK_DATA */
|
---|
| 519 |
|
---|
| 520 | #if SMTP_COPY_AUTHDATA
|
---|
| 521 | /* copy auth data, ensuring the first byte is always zero */
|
---|
| 522 | MEMCPY(s->auth_plain + 1, smtp_auth_plain + 1, smtp_auth_plain_len - 1);
|
---|
| 523 | s->auth_plain_len = smtp_auth_plain_len;
|
---|
| 524 | /* default username and pass is empty string */
|
---|
| 525 | s->username = s->auth_plain;
|
---|
| 526 | s->pass = s->auth_plain;
|
---|
| 527 | if (smtp_username != NULL) {
|
---|
| 528 | s->username += smtp_username - smtp_auth_plain;
|
---|
| 529 | }
|
---|
| 530 | if (smtp_pass != NULL) {
|
---|
| 531 | s->pass += smtp_pass - smtp_auth_plain;
|
---|
| 532 | }
|
---|
| 533 | #endif /* SMTP_COPY_AUTHDATA */
|
---|
| 534 |
|
---|
| 535 | s->state = SMTP_NULL;
|
---|
| 536 | s->timer = SMTP_TIMEOUT;
|
---|
| 537 |
|
---|
| 538 | #if LWIP_DNS
|
---|
| 539 | err = dns_gethostbyname(smtp_server, &addr, smtp_dns_found, s);
|
---|
| 540 | #else /* LWIP_DNS */
|
---|
| 541 | err = ipaddr_aton(smtp_server, &addr) ? ERR_OK : ERR_ARG;
|
---|
| 542 | #endif /* LWIP_DNS */
|
---|
| 543 | if (err == ERR_OK) {
|
---|
| 544 | pcb = smtp_setup_pcb(s, &addr);
|
---|
| 545 | if (pcb == NULL) {
|
---|
| 546 | err = ERR_MEM;
|
---|
| 547 | goto leave;
|
---|
| 548 | }
|
---|
| 549 | err = altcp_connect(pcb, &addr, smtp_server_port, smtp_tcp_connected);
|
---|
| 550 | if (err != ERR_OK) {
|
---|
| 551 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("tcp_connect failed: %d\n", (int)err));
|
---|
| 552 | goto deallocate_and_leave;
|
---|
| 553 | }
|
---|
| 554 | } else if (err != ERR_INPROGRESS) {
|
---|
| 555 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("dns_gethostbyname failed: %d\n", (int)err));
|
---|
| 556 | goto deallocate_and_leave;
|
---|
| 557 | }
|
---|
| 558 | return ERR_OK;
|
---|
| 559 |
|
---|
| 560 | deallocate_and_leave:
|
---|
| 561 | if (pcb != NULL) {
|
---|
| 562 | altcp_arg(pcb, NULL);
|
---|
| 563 | altcp_close(pcb);
|
---|
| 564 | }
|
---|
| 565 | leave:
|
---|
| 566 | smtp_free_struct(s);
|
---|
| 567 | /* no need to call the callback here since we return != ERR_OK */
|
---|
| 568 | return err;
|
---|
| 569 | }
|
---|
| 570 |
|
---|
| 571 | /** @ingroup smtp
|
---|
| 572 | * Send an email via the currently selected server, username and password.
|
---|
| 573 | *
|
---|
| 574 | * @param from source email address (must be NULL-terminated)
|
---|
| 575 | * @param to target email address (must be NULL-terminated)
|
---|
| 576 | * @param subject email subject (must be NULL-terminated)
|
---|
| 577 | * @param body email body (must be NULL-terminated)
|
---|
| 578 | * @param callback_fn callback function
|
---|
| 579 | * @param callback_arg user argument to callback_fn
|
---|
| 580 | * @returns - ERR_OK if structures were allocated and no error occured starting the connection
|
---|
| 581 | * (this does not mean the email has been successfully sent!)
|
---|
| 582 | * - another err_t on error.
|
---|
| 583 | */
|
---|
| 584 | err_t
|
---|
| 585 | smtp_send_mail(const char* from, const char* to, const char* subject, const char* body,
|
---|
| 586 | smtp_result_fn callback_fn, void* callback_arg)
|
---|
| 587 | {
|
---|
| 588 | struct smtp_session* s;
|
---|
| 589 | size_t from_len = strlen(from);
|
---|
| 590 | size_t to_len = strlen(to);
|
---|
| 591 | size_t subject_len = strlen(subject);
|
---|
| 592 | size_t body_len = strlen(body);
|
---|
| 593 | size_t mem_len = sizeof(struct smtp_session);
|
---|
| 594 | char *sfrom, *sto, *ssubject, *sbody;
|
---|
| 595 |
|
---|
| 596 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 597 |
|
---|
| 598 | mem_len += from_len + to_len + subject_len + body_len + 4;
|
---|
| 599 | if (mem_len > 0xffff) {
|
---|
| 600 | /* too long! */
|
---|
| 601 | return ERR_MEM;
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 | /* Allocate memory to keep this email's session state */
|
---|
| 605 | s = (struct smtp_session *)SMTP_STATE_MALLOC((mem_size_t)mem_len);
|
---|
| 606 | if (s == NULL) {
|
---|
| 607 | return ERR_MEM;
|
---|
| 608 | }
|
---|
| 609 | /* initialize the structure */
|
---|
| 610 | memset(s, 0, mem_len);
|
---|
| 611 | s->from = sfrom = (char*)s + sizeof(struct smtp_session);
|
---|
| 612 | s->from_len = (u16_t)from_len;
|
---|
| 613 | s->to = sto = sfrom + from_len + 1;
|
---|
| 614 | s->to_len = (u16_t)to_len;
|
---|
| 615 | s->subject = ssubject = sto + to_len + 1;
|
---|
| 616 | s->subject_len = (u16_t)subject_len;
|
---|
| 617 | s->body = sbody = ssubject + subject_len + 1;
|
---|
| 618 | s->body_len = (u16_t)body_len;
|
---|
| 619 | /* copy source and target email address */
|
---|
| 620 | /* cast to size_t is a hack to cast away constness */
|
---|
| 621 | MEMCPY(sfrom, from, from_len + 1);
|
---|
| 622 | MEMCPY(sto, to, to_len + 1);
|
---|
| 623 | MEMCPY(ssubject, subject, subject_len + 1);
|
---|
| 624 | MEMCPY(sbody, body, body_len + 1);
|
---|
| 625 |
|
---|
| 626 | s->callback_fn = callback_fn;
|
---|
| 627 | s->callback_arg = callback_arg;
|
---|
| 628 |
|
---|
| 629 | /* call the actual implementation of this function */
|
---|
| 630 | return smtp_send_mail_alloced(s);
|
---|
| 631 | }
|
---|
| 632 |
|
---|
| 633 | /** @ingroup smtp
|
---|
| 634 | * Same as smtp_send_mail, but doesn't copy from, to, subject and body into
|
---|
| 635 | * an internal buffer to save memory.
|
---|
| 636 | * WARNING: the above data must stay untouched until the callback function is
|
---|
| 637 | * called (unless the function returns != ERR_OK)
|
---|
| 638 | */
|
---|
| 639 | err_t
|
---|
| 640 | smtp_send_mail_static(const char *from, const char* to, const char* subject,
|
---|
| 641 | const char* body, smtp_result_fn callback_fn, void* callback_arg)
|
---|
| 642 | {
|
---|
| 643 | struct smtp_session* s;
|
---|
| 644 | size_t len;
|
---|
| 645 |
|
---|
| 646 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 647 |
|
---|
| 648 | s = (struct smtp_session*)SMTP_STATE_MALLOC(sizeof(struct smtp_session));
|
---|
| 649 | if (s == NULL) {
|
---|
| 650 | return ERR_MEM;
|
---|
| 651 | }
|
---|
| 652 | memset(s, 0, sizeof(struct smtp_session));
|
---|
| 653 | /* initialize the structure */
|
---|
| 654 | s->from = from;
|
---|
| 655 | len = strlen(from);
|
---|
| 656 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 657 | s->from_len = (u16_t)len;
|
---|
| 658 | s->to = to;
|
---|
| 659 | len = strlen(to);
|
---|
| 660 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 661 | s->to_len = (u16_t)len;
|
---|
| 662 | s->subject = subject;
|
---|
| 663 | len = strlen(subject);
|
---|
| 664 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 665 | s->subject_len = (u16_t)len;
|
---|
| 666 | s->body = body;
|
---|
| 667 | len = strlen(body);
|
---|
| 668 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 669 | s->body_len = (u16_t)len;
|
---|
| 670 | s->callback_fn = callback_fn;
|
---|
| 671 | s->callback_arg = callback_arg;
|
---|
| 672 | /* call the actual implementation of this function */
|
---|
| 673 | return smtp_send_mail_alloced(s);
|
---|
| 674 | }
|
---|
| 675 |
|
---|
| 676 |
|
---|
| 677 | /** @ingroup smtp
|
---|
| 678 | * Same as smtp_send_mail but takes a struct smtp_send_request as single
|
---|
| 679 | * parameter which contains all the other parameters.
|
---|
| 680 | * To be used with tcpip_callback to send mail from interrupt context or from
|
---|
| 681 | * another thread.
|
---|
| 682 | *
|
---|
| 683 | * WARNING: server and authentication must stay untouched until this function has run!
|
---|
| 684 | *
|
---|
| 685 | * Usage example:
|
---|
| 686 | * - allocate a struct smtp_send_request (in a way that is allowed in interrupt context)
|
---|
| 687 | * - fill the members of the struct as if calling smtp_send_mail
|
---|
| 688 | * - specify a callback_function
|
---|
| 689 | * - set callback_arg to the structure itself
|
---|
| 690 | * - call this function
|
---|
| 691 | * - wait for the callback function to be called
|
---|
| 692 | * - in the callback function, deallocate the structure (passed as arg)
|
---|
| 693 | */
|
---|
| 694 | void
|
---|
| 695 | smtp_send_mail_int(void *arg)
|
---|
| 696 | {
|
---|
| 697 | struct smtp_send_request *req = (struct smtp_send_request*)arg;
|
---|
| 698 | err_t err;
|
---|
| 699 |
|
---|
| 700 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 701 | LWIP_ASSERT("smtp_send_mail_int: no argument given", arg != NULL);
|
---|
| 702 |
|
---|
| 703 | if (req->static_data) {
|
---|
| 704 | err = smtp_send_mail_static(req->from, req->to, req->subject, req->body,
|
---|
| 705 | req->callback_fn, req->callback_arg);
|
---|
| 706 | } else {
|
---|
| 707 | err = smtp_send_mail(req->from, req->to, req->subject, req->body,
|
---|
| 708 | req->callback_fn, req->callback_arg);
|
---|
| 709 | }
|
---|
| 710 | if ((err != ERR_OK) && (req->callback_fn != NULL)) {
|
---|
| 711 | req->callback_fn(req->callback_arg, SMTP_RESULT_ERR_UNKNOWN, 0, err);
|
---|
| 712 | }
|
---|
| 713 | }
|
---|
| 714 |
|
---|
| 715 | #if SMTP_CHECK_DATA
|
---|
| 716 | /** Verify that a given string conforms to the SMTP rules
|
---|
| 717 | * (7-bit only, no single CR or LF,
|
---|
| 718 | * @todo: no line consisting of a single dot only)
|
---|
| 719 | */
|
---|
| 720 | static err_t
|
---|
| 721 | smtp_verify(const char *data, size_t data_len, u8_t linebreaks_allowed)
|
---|
| 722 | {
|
---|
| 723 | size_t i;
|
---|
| 724 | u8_t last_was_cr = 0;
|
---|
| 725 | for (i = 0; i < data_len; i++) {
|
---|
| 726 | char current = data[i];
|
---|
| 727 | if ((current & 0x80) != 0) {
|
---|
| 728 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("smtp_verify: no 8-bit data supported: %s\n", data));
|
---|
| 729 | return ERR_ARG;
|
---|
| 730 | }
|
---|
| 731 | if (current == '\r') {
|
---|
| 732 | if (!linebreaks_allowed) {
|
---|
| 733 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("smtp_verify: found CR where no linebreaks allowed: %s\n", data));
|
---|
| 734 | return ERR_ARG;
|
---|
| 735 | }
|
---|
| 736 | if (last_was_cr) {
|
---|
| 737 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("smtp_verify: found double CR: %s\n", data));
|
---|
| 738 | return ERR_ARG;
|
---|
| 739 | }
|
---|
| 740 | last_was_cr = 1;
|
---|
| 741 | } else {
|
---|
| 742 | if (current == '\n') {
|
---|
| 743 | if (!last_was_cr) {
|
---|
| 744 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("smtp_verify: found LF without CR before: %s\n", data));
|
---|
| 745 | return ERR_ARG;
|
---|
| 746 | }
|
---|
| 747 | }
|
---|
| 748 | last_was_cr = 0;
|
---|
| 749 | }
|
---|
| 750 | }
|
---|
| 751 | return ERR_OK;
|
---|
| 752 | }
|
---|
| 753 | #endif /* SMTP_CHECK_DATA */
|
---|
| 754 |
|
---|
| 755 | /** Frees the smtp_session and calls the callback function */
|
---|
| 756 | static void
|
---|
| 757 | smtp_free(struct smtp_session *s, u8_t result, u16_t srv_err, err_t err)
|
---|
| 758 | {
|
---|
| 759 | smtp_result_fn fn = s->callback_fn;
|
---|
| 760 | void *arg = s->callback_arg;
|
---|
| 761 | if (s->p != NULL) {
|
---|
| 762 | pbuf_free(s->p);
|
---|
| 763 | }
|
---|
| 764 | smtp_free_struct(s);
|
---|
| 765 | if (fn != NULL) {
|
---|
| 766 | fn(arg, result, srv_err, err);
|
---|
| 767 | }
|
---|
| 768 | }
|
---|
| 769 |
|
---|
| 770 | /** Try to close a pcb and free the arg if successful */
|
---|
| 771 | static void
|
---|
| 772 | smtp_close(struct smtp_session *s, struct altcp_pcb *pcb, u8_t result,
|
---|
| 773 | u16_t srv_err, err_t err)
|
---|
| 774 | {
|
---|
| 775 | if (pcb != NULL) {
|
---|
| 776 | altcp_arg(pcb, NULL);
|
---|
| 777 | if (altcp_close(pcb) == ERR_OK) {
|
---|
| 778 | if (s != NULL) {
|
---|
| 779 | smtp_free(s, result, srv_err, err);
|
---|
| 780 | }
|
---|
| 781 | } else {
|
---|
| 782 | /* close failed, set back arg */
|
---|
| 783 | altcp_arg(pcb, s);
|
---|
| 784 | }
|
---|
| 785 | } else {
|
---|
| 786 | if (s != NULL) {
|
---|
| 787 | smtp_free(s, result, srv_err, err);
|
---|
| 788 | }
|
---|
| 789 | }
|
---|
| 790 | }
|
---|
| 791 |
|
---|
| 792 | /** Raw API TCP err callback: pcb is already deallocated */
|
---|
| 793 | static void
|
---|
| 794 | smtp_tcp_err(void *arg, err_t err)
|
---|
| 795 | {
|
---|
| 796 | LWIP_UNUSED_ARG(err);
|
---|
| 797 | if (arg != NULL) {
|
---|
| 798 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("smtp_tcp_err: connection reset by remote host\n"));
|
---|
| 799 | smtp_free((struct smtp_session*)arg, SMTP_RESULT_ERR_CLOSED, 0, err);
|
---|
| 800 | }
|
---|
| 801 | }
|
---|
| 802 |
|
---|
| 803 | /** Raw API TCP poll callback */
|
---|
| 804 | static err_t
|
---|
| 805 | smtp_tcp_poll(void *arg, struct altcp_pcb *pcb)
|
---|
| 806 | {
|
---|
| 807 | if (arg != NULL) {
|
---|
| 808 | struct smtp_session *s = (struct smtp_session*)arg;
|
---|
| 809 | if (s->timer != 0) {
|
---|
| 810 | s->timer--;
|
---|
| 811 | }
|
---|
| 812 | }
|
---|
| 813 | smtp_process(arg, pcb, NULL);
|
---|
| 814 | return ERR_OK;
|
---|
| 815 | }
|
---|
| 816 |
|
---|
| 817 | /** Raw API TCP sent callback */
|
---|
| 818 | static err_t
|
---|
| 819 | smtp_tcp_sent(void *arg, struct altcp_pcb *pcb, u16_t len)
|
---|
| 820 | {
|
---|
| 821 | LWIP_UNUSED_ARG(len);
|
---|
| 822 |
|
---|
| 823 | smtp_process(arg, pcb, NULL);
|
---|
| 824 |
|
---|
| 825 | return ERR_OK;
|
---|
| 826 | }
|
---|
| 827 |
|
---|
| 828 | /** Raw API TCP recv callback */
|
---|
| 829 | static err_t
|
---|
| 830 | smtp_tcp_recv(void *arg, struct altcp_pcb *pcb, struct pbuf *p, err_t err)
|
---|
| 831 | {
|
---|
| 832 | LWIP_UNUSED_ARG(err);
|
---|
| 833 | if (p != NULL) {
|
---|
| 834 | altcp_recved(pcb, p->tot_len);
|
---|
| 835 | smtp_process(arg, pcb, p);
|
---|
| 836 | } else {
|
---|
| 837 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("smtp_tcp_recv: connection closed by remote host\n"));
|
---|
| 838 | smtp_close((struct smtp_session*)arg, pcb, SMTP_RESULT_ERR_CLOSED, 0, err);
|
---|
| 839 | }
|
---|
| 840 | return ERR_OK;
|
---|
| 841 | }
|
---|
| 842 |
|
---|
| 843 | static err_t
|
---|
| 844 | smtp_tcp_connected(void *arg, struct altcp_pcb *pcb, err_t err)
|
---|
| 845 | {
|
---|
| 846 | LWIP_UNUSED_ARG(arg);
|
---|
| 847 |
|
---|
| 848 | if (err == ERR_OK) {
|
---|
| 849 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_connected: Waiting for 220\n"));
|
---|
| 850 | } else {
|
---|
| 851 | /* shouldn't happen, but we still check 'err', only to be sure */
|
---|
| 852 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("smtp_connected: %d\n", (int)err));
|
---|
| 853 | smtp_close((struct smtp_session*)arg, pcb, SMTP_RESULT_ERR_CONNECT, 0, err);
|
---|
| 854 | }
|
---|
| 855 | return ERR_OK;
|
---|
| 856 | }
|
---|
| 857 |
|
---|
| 858 | #if LWIP_DNS
|
---|
| 859 | /** DNS callback
|
---|
| 860 | * If ipaddr is non-NULL, resolving succeeded, otherwise it failed.
|
---|
| 861 | */
|
---|
| 862 | static void
|
---|
| 863 | smtp_dns_found(const char* hostname, const ip_addr_t *ipaddr, void *arg)
|
---|
| 864 | {
|
---|
| 865 | struct smtp_session *s = (struct smtp_session*)arg;
|
---|
| 866 | struct altcp_pcb *pcb;
|
---|
| 867 | err_t err;
|
---|
| 868 | u8_t result;
|
---|
| 869 |
|
---|
| 870 | LWIP_UNUSED_ARG(hostname);
|
---|
| 871 |
|
---|
| 872 | if (ipaddr != NULL) {
|
---|
| 873 | pcb = smtp_setup_pcb(s, ipaddr);
|
---|
| 874 | if (pcb != NULL) {
|
---|
| 875 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_dns_found: hostname resolved, connecting\n"));
|
---|
| 876 | err = altcp_connect(pcb, ipaddr, smtp_server_port, smtp_tcp_connected);
|
---|
| 877 | if (err == ERR_OK) {
|
---|
| 878 | return;
|
---|
| 879 | }
|
---|
| 880 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("tcp_connect failed: %d\n", (int)err));
|
---|
| 881 | result = SMTP_RESULT_ERR_CONNECT;
|
---|
| 882 | } else {
|
---|
| 883 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_dns_found: failed to allocate tcp pcb\n"));
|
---|
| 884 | result = SMTP_RESULT_ERR_MEM;
|
---|
| 885 | err = ERR_MEM;
|
---|
| 886 | }
|
---|
| 887 | } else {
|
---|
| 888 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("smtp_dns_found: failed to resolve hostname: %s\n",
|
---|
| 889 | hostname));
|
---|
| 890 | pcb = NULL;
|
---|
| 891 | result = SMTP_RESULT_ERR_HOSTNAME;
|
---|
| 892 | err = ERR_ARG;
|
---|
| 893 | }
|
---|
| 894 | smtp_close(s, pcb, result, 0, err);
|
---|
| 895 | }
|
---|
| 896 | #endif /* LWIP_DNS */
|
---|
| 897 |
|
---|
| 898 | #if SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN
|
---|
| 899 |
|
---|
| 900 | /** Table 6-bit-index-to-ASCII used for base64-encoding */
|
---|
| 901 | static const char base64_table[] = {
|
---|
| 902 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
|
---|
| 903 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
|
---|
| 904 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
|
---|
| 905 | 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
|
---|
| 906 | 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
|
---|
| 907 | 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
|
---|
| 908 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
|
---|
| 909 | '+', '/'
|
---|
| 910 | };
|
---|
| 911 |
|
---|
| 912 | /** Base64 encoding */
|
---|
| 913 | static size_t
|
---|
| 914 | smtp_base64_encode(char* target, size_t target_len, const char* source, size_t source_len)
|
---|
| 915 | {
|
---|
| 916 | size_t i;
|
---|
| 917 | s8_t j;
|
---|
| 918 | size_t target_idx = 0;
|
---|
| 919 | size_t longer = (source_len % 3) ? (3 - (source_len % 3)) : 0;
|
---|
| 920 | size_t source_len_b64 = source_len + longer;
|
---|
| 921 | size_t len = (((source_len_b64) * 4) / 3);
|
---|
| 922 | u8_t x = 5;
|
---|
| 923 | u8_t current = 0;
|
---|
| 924 | LWIP_UNUSED_ARG(target_len);
|
---|
| 925 |
|
---|
| 926 | LWIP_ASSERT("target_len is too short", target_len >= len);
|
---|
| 927 |
|
---|
| 928 | for (i = 0; i < source_len_b64; i++) {
|
---|
| 929 | u8_t b = (i < source_len ? (u8_t)source[i] : 0);
|
---|
| 930 | for (j = 7; j >= 0; j--, x--) {
|
---|
| 931 | if ((b & (1 << j)) != 0) {
|
---|
| 932 | current = (u8_t)(current | (1U << x));
|
---|
| 933 | }
|
---|
| 934 | if (x == 0) {
|
---|
| 935 | target[target_idx++] = base64_table[current];
|
---|
| 936 | x = 6;
|
---|
| 937 | current = 0;
|
---|
| 938 | }
|
---|
| 939 | }
|
---|
| 940 | }
|
---|
| 941 | for (i = len - longer; i < len; i++) {
|
---|
| 942 | target[i] = '=';
|
---|
| 943 | }
|
---|
| 944 | return len;
|
---|
| 945 | }
|
---|
| 946 | #endif /* SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN */
|
---|
| 947 |
|
---|
| 948 | /** Parse pbuf to see if it contains the beginning of an answer.
|
---|
| 949 | * If so, it returns the contained response code as number between 1 and 999.
|
---|
| 950 | * If not, zero is returned.
|
---|
| 951 | *
|
---|
| 952 | * @param s smtp session struct
|
---|
| 953 | */
|
---|
| 954 | static u16_t
|
---|
| 955 | smtp_is_response(struct smtp_session *s)
|
---|
| 956 | {
|
---|
| 957 | char digits[4];
|
---|
| 958 | long num;
|
---|
| 959 |
|
---|
| 960 | if (s->p == NULL) {
|
---|
| 961 | return 0;
|
---|
| 962 | }
|
---|
| 963 | /* copy three digits and convert them to int */
|
---|
| 964 | if (pbuf_copy_partial(s->p, digits, 3, 0) != 3) {
|
---|
| 965 | /* pbuf was too short */
|
---|
| 966 | return 0;
|
---|
| 967 | }
|
---|
| 968 | digits[3] = 0;
|
---|
| 969 | num = strtol(digits, NULL, 10);
|
---|
| 970 | if ((num <= 0) || (num >= 1000)) {
|
---|
| 971 | /* failed to find response code at start of line */
|
---|
| 972 | return 0;
|
---|
| 973 | }
|
---|
| 974 | return (u16_t)num;
|
---|
| 975 | }
|
---|
| 976 |
|
---|
| 977 | /** Parse pbuf to see if it contains a fully received answer.
|
---|
| 978 | * If one is found, ERR_OK is returned.
|
---|
| 979 | * If none is found, ERR_VAL is returned.
|
---|
| 980 | *
|
---|
| 981 | * A fully received answer is a 3-digit number followed by a space,
|
---|
| 982 | * some string and a CRLF as line ending.
|
---|
| 983 | *
|
---|
| 984 | * @param s smtp session struct
|
---|
| 985 | */
|
---|
| 986 | static err_t
|
---|
| 987 | smtp_is_response_finished(struct smtp_session *s)
|
---|
| 988 | {
|
---|
| 989 | u8_t sp;
|
---|
| 990 | u16_t crlf;
|
---|
| 991 | u16_t offset;
|
---|
| 992 |
|
---|
| 993 | if (s->p == NULL) {
|
---|
| 994 | return ERR_VAL;
|
---|
| 995 | }
|
---|
| 996 | offset = 0;
|
---|
| 997 | again:
|
---|
| 998 | /* We could check the response number here, but we trust the
|
---|
| 999 | * protocol definition which says the client can rely on it being
|
---|
| 1000 | * the same on every line. */
|
---|
| 1001 |
|
---|
| 1002 | /* find CRLF */
|
---|
| 1003 | if (offset > 0xFFFF - 4) {
|
---|
| 1004 | /* would overflow */
|
---|
| 1005 | return ERR_VAL;
|
---|
| 1006 | }
|
---|
| 1007 | crlf = pbuf_memfind(s->p, SMTP_CRLF, SMTP_CRLF_LEN, (u16_t)(offset + 4));
|
---|
| 1008 | if (crlf == 0xFFFF) {
|
---|
| 1009 | /* no CRLF found */
|
---|
| 1010 | return ERR_VAL;
|
---|
| 1011 | }
|
---|
| 1012 | sp = pbuf_get_at(s->p, (u16_t)(offset + 3));
|
---|
| 1013 | if (sp == '-') {
|
---|
| 1014 | /* no space after response code -> try next line */
|
---|
| 1015 | offset = (u16_t)(crlf + 2);
|
---|
| 1016 | if (offset < crlf) {
|
---|
| 1017 | /* overflow */
|
---|
| 1018 | return ERR_VAL;
|
---|
| 1019 | }
|
---|
| 1020 | goto again;
|
---|
| 1021 | } else if (sp == ' ') {
|
---|
| 1022 | /* CRLF found after response code + space -> valid response */
|
---|
| 1023 | return ERR_OK;
|
---|
| 1024 | }
|
---|
| 1025 | /* sp contains invalid character */
|
---|
| 1026 | return ERR_VAL;
|
---|
| 1027 | }
|
---|
| 1028 |
|
---|
| 1029 | /** Prepare HELO/EHLO message */
|
---|
| 1030 | static enum smtp_session_state
|
---|
| 1031 | smtp_prepare_helo(struct smtp_session *s, u16_t *tx_buf_len, struct altcp_pcb *pcb)
|
---|
| 1032 | {
|
---|
| 1033 | size_t ipa_len;
|
---|
| 1034 | const char *ipa = ipaddr_ntoa(altcp_get_ip(pcb, 1));
|
---|
| 1035 | LWIP_ASSERT("ipaddr_ntoa returned NULL", ipa != NULL);
|
---|
| 1036 | ipa_len = strlen(ipa);
|
---|
| 1037 | LWIP_ASSERT("string too long", ipa_len <= (SMTP_TX_BUF_LEN-SMTP_CMD_EHLO_1_LEN-SMTP_CMD_EHLO_2_LEN));
|
---|
| 1038 |
|
---|
| 1039 | *tx_buf_len = (u16_t)(SMTP_CMD_EHLO_1_LEN + (u16_t)ipa_len + SMTP_CMD_EHLO_2_LEN);
|
---|
| 1040 | LWIP_ASSERT("tx_buf overflow detected", *tx_buf_len <= SMTP_TX_BUF_LEN);
|
---|
| 1041 |
|
---|
| 1042 | SMEMCPY(s->tx_buf, SMTP_CMD_EHLO_1, SMTP_CMD_EHLO_1_LEN);
|
---|
| 1043 | MEMCPY(&s->tx_buf[SMTP_CMD_EHLO_1_LEN], ipa, ipa_len);
|
---|
| 1044 | SMEMCPY(&s->tx_buf[SMTP_CMD_EHLO_1_LEN + ipa_len], SMTP_CMD_EHLO_2, SMTP_CMD_EHLO_2_LEN);
|
---|
| 1045 | return SMTP_HELO;
|
---|
| 1046 | }
|
---|
| 1047 |
|
---|
| 1048 | #if SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN
|
---|
| 1049 | /** Parse last server response (in rx_buf) for supported authentication method,
|
---|
| 1050 | * create data to send out (to tx_buf), set tx_data_len correctly
|
---|
| 1051 | * and return the next state.
|
---|
| 1052 | */
|
---|
| 1053 | static enum smtp_session_state
|
---|
| 1054 | smtp_prepare_auth_or_mail(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1055 | {
|
---|
| 1056 | /* check response for supported authentication method */
|
---|
| 1057 | u16_t auth = pbuf_strstr(s->p, SMTP_KEYWORD_AUTH_SP);
|
---|
| 1058 | if (auth == 0xFFFF) {
|
---|
| 1059 | auth = pbuf_strstr(s->p, SMTP_KEYWORD_AUTH_EQ);
|
---|
| 1060 | }
|
---|
| 1061 | if (auth != 0xFFFF) {
|
---|
| 1062 | u16_t crlf = pbuf_memfind(s->p, SMTP_CRLF, SMTP_CRLF_LEN, auth);
|
---|
| 1063 | if ((crlf != 0xFFFF) && (crlf > auth)) {
|
---|
| 1064 | /* use tx_buf temporarily */
|
---|
| 1065 | u16_t copied = pbuf_copy_partial(s->p, s->tx_buf, (u16_t)(crlf - auth), auth);
|
---|
| 1066 | if (copied != 0) {
|
---|
| 1067 | char *sep = s->tx_buf + SMTP_KEYWORD_AUTH_LEN;
|
---|
| 1068 | s->tx_buf[copied] = 0;
|
---|
| 1069 | #if SMTP_SUPPORT_AUTH_PLAIN
|
---|
| 1070 | /* favour PLAIN over LOGIN since it involves less requests */
|
---|
| 1071 | if (strstr(sep, SMTP_AUTH_PARAM_PLAIN) != NULL) {
|
---|
| 1072 | size_t auth_len;
|
---|
| 1073 | /* server supports AUTH PLAIN */
|
---|
| 1074 | SMEMCPY(s->tx_buf, SMTP_CMD_AUTHPLAIN_1, SMTP_CMD_AUTHPLAIN_1_LEN);
|
---|
| 1075 |
|
---|
| 1076 | /* add base64-encoded string "\0username\0password" */
|
---|
| 1077 | auth_len = smtp_base64_encode(&s->tx_buf[SMTP_CMD_AUTHPLAIN_1_LEN],
|
---|
| 1078 | SMTP_TX_BUF_LEN - SMTP_CMD_AUTHPLAIN_1_LEN, SMTP_AUTH_PLAIN_DATA(s),
|
---|
| 1079 | SMTP_AUTH_PLAIN_LEN(s));
|
---|
| 1080 | LWIP_ASSERT("string too long", auth_len <= (SMTP_TX_BUF_LEN-SMTP_CMD_AUTHPLAIN_1_LEN-SMTP_CMD_AUTHPLAIN_2_LEN));
|
---|
| 1081 | *tx_buf_len = (u16_t)(SMTP_CMD_AUTHPLAIN_1_LEN + SMTP_CMD_AUTHPLAIN_2_LEN + (u16_t)auth_len);
|
---|
| 1082 | SMEMCPY(&s->tx_buf[SMTP_CMD_AUTHPLAIN_1_LEN + auth_len], SMTP_CMD_AUTHPLAIN_2,
|
---|
| 1083 | SMTP_CMD_AUTHPLAIN_2_LEN);
|
---|
| 1084 | return SMTP_AUTH_PLAIN;
|
---|
| 1085 | } else
|
---|
| 1086 | #endif /* SMTP_SUPPORT_AUTH_PLAIN */
|
---|
| 1087 | {
|
---|
| 1088 | #if SMTP_SUPPORT_AUTH_LOGIN
|
---|
| 1089 | if (strstr(sep, SMTP_AUTH_PARAM_LOGIN) != NULL) {
|
---|
| 1090 | /* server supports AUTH LOGIN */
|
---|
| 1091 | *tx_buf_len = SMTP_CMD_AUTHLOGIN_LEN;
|
---|
| 1092 | SMEMCPY(s->tx_buf, SMTP_CMD_AUTHLOGIN, SMTP_CMD_AUTHLOGIN_LEN);
|
---|
| 1093 | return SMTP_AUTH_LOGIN_UNAME;
|
---|
| 1094 | }
|
---|
| 1095 | #endif /* SMTP_SUPPORT_AUTH_LOGIN */
|
---|
| 1096 | }
|
---|
| 1097 | }
|
---|
| 1098 | }
|
---|
| 1099 | }
|
---|
| 1100 | /* server didnt's send correct keywords for AUTH, try sending directly */
|
---|
| 1101 | return smtp_prepare_mail(s, tx_buf_len);
|
---|
| 1102 | }
|
---|
| 1103 | #endif /* SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN */
|
---|
| 1104 |
|
---|
| 1105 | #if SMTP_SUPPORT_AUTH_LOGIN
|
---|
| 1106 | /** Send base64-encoded username */
|
---|
| 1107 | static enum smtp_session_state
|
---|
| 1108 | smtp_prepare_auth_login_uname(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1109 | {
|
---|
| 1110 | size_t base64_len = smtp_base64_encode(s->tx_buf, SMTP_TX_BUF_LEN,
|
---|
| 1111 | SMTP_USERNAME(s), strlen(SMTP_USERNAME(s)));
|
---|
| 1112 | /* @todo: support base64-encoded longer than 64k */
|
---|
| 1113 | LWIP_ASSERT("string too long", base64_len <= 0xffff);
|
---|
| 1114 | LWIP_ASSERT("tx_buf overflow detected", base64_len <= SMTP_TX_BUF_LEN - SMTP_CRLF_LEN);
|
---|
| 1115 | *tx_buf_len = (u16_t)(base64_len + SMTP_CRLF_LEN);
|
---|
| 1116 |
|
---|
| 1117 | SMEMCPY(&s->tx_buf[base64_len], SMTP_CRLF, SMTP_CRLF_LEN);
|
---|
| 1118 | s->tx_buf[*tx_buf_len] = 0;
|
---|
| 1119 | return SMTP_AUTH_LOGIN_PASS;
|
---|
| 1120 | }
|
---|
| 1121 |
|
---|
| 1122 | /** Send base64-encoded password */
|
---|
| 1123 | static enum smtp_session_state
|
---|
| 1124 | smtp_prepare_auth_login_pass(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1125 | {
|
---|
| 1126 | size_t base64_len = smtp_base64_encode(s->tx_buf, SMTP_TX_BUF_LEN,
|
---|
| 1127 | SMTP_PASS(s), strlen(SMTP_PASS(s)));
|
---|
| 1128 | /* @todo: support base64-encoded longer than 64k */
|
---|
| 1129 | LWIP_ASSERT("string too long", base64_len <= 0xffff);
|
---|
| 1130 | LWIP_ASSERT("tx_buf overflow detected", base64_len <= SMTP_TX_BUF_LEN - SMTP_CRLF_LEN);
|
---|
| 1131 | *tx_buf_len = (u16_t)(base64_len + SMTP_CRLF_LEN);
|
---|
| 1132 |
|
---|
| 1133 | SMEMCPY(&s->tx_buf[base64_len], SMTP_CRLF, SMTP_CRLF_LEN);
|
---|
| 1134 | s->tx_buf[*tx_buf_len] = 0;
|
---|
| 1135 | return SMTP_AUTH_LOGIN;
|
---|
| 1136 | }
|
---|
| 1137 | #endif /* SMTP_SUPPORT_AUTH_LOGIN */
|
---|
| 1138 |
|
---|
| 1139 | /** Prepare MAIL message */
|
---|
| 1140 | static enum smtp_session_state
|
---|
| 1141 | smtp_prepare_mail(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1142 | {
|
---|
| 1143 | char *target = s->tx_buf;
|
---|
| 1144 | LWIP_ASSERT("tx_buf overflow detected", s->from_len <= (SMTP_TX_BUF_LEN - SMTP_CMD_MAIL_1_LEN - SMTP_CMD_MAIL_2_LEN));
|
---|
| 1145 | *tx_buf_len = (u16_t)(SMTP_CMD_MAIL_1_LEN + SMTP_CMD_MAIL_2_LEN + s->from_len);
|
---|
| 1146 | target[*tx_buf_len] = 0;
|
---|
| 1147 |
|
---|
| 1148 | SMEMCPY(target, SMTP_CMD_MAIL_1, SMTP_CMD_MAIL_1_LEN);
|
---|
| 1149 | target += SMTP_CMD_MAIL_1_LEN;
|
---|
| 1150 | MEMCPY(target, s->from, s->from_len);
|
---|
| 1151 | target += s->from_len;
|
---|
| 1152 | SMEMCPY(target, SMTP_CMD_MAIL_2, SMTP_CMD_MAIL_2_LEN);
|
---|
| 1153 | return SMTP_MAIL;
|
---|
| 1154 | }
|
---|
| 1155 |
|
---|
| 1156 | /** Prepare RCPT message */
|
---|
| 1157 | static enum smtp_session_state
|
---|
| 1158 | smtp_prepare_rcpt(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1159 | {
|
---|
| 1160 | char *target = s->tx_buf;
|
---|
| 1161 | LWIP_ASSERT("tx_buf overflow detected", s->to_len <= (SMTP_TX_BUF_LEN - SMTP_CMD_RCPT_1_LEN - SMTP_CMD_RCPT_2_LEN));
|
---|
| 1162 | *tx_buf_len = (u16_t)(SMTP_CMD_RCPT_1_LEN + SMTP_CMD_RCPT_2_LEN + s->to_len);
|
---|
| 1163 | target[*tx_buf_len] = 0;
|
---|
| 1164 |
|
---|
| 1165 | SMEMCPY(target, SMTP_CMD_RCPT_1, SMTP_CMD_RCPT_1_LEN);
|
---|
| 1166 | target += SMTP_CMD_RCPT_1_LEN;
|
---|
| 1167 | MEMCPY(target, s->to, s->to_len);
|
---|
| 1168 | target += s->to_len;
|
---|
| 1169 | SMEMCPY(target, SMTP_CMD_RCPT_2, SMTP_CMD_RCPT_2_LEN);
|
---|
| 1170 | return SMTP_RCPT;
|
---|
| 1171 | }
|
---|
| 1172 |
|
---|
| 1173 | /** Prepare header of body */
|
---|
| 1174 | static enum smtp_session_state
|
---|
| 1175 | smtp_prepare_header(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1176 | {
|
---|
| 1177 | char *target = s->tx_buf;
|
---|
| 1178 | int len = SMTP_CMD_HEADER_1_LEN + SMTP_CMD_HEADER_2_LEN +
|
---|
| 1179 | SMTP_CMD_HEADER_3_LEN + SMTP_CMD_HEADER_4_LEN + s->from_len + s->to_len +
|
---|
| 1180 | s->subject_len;
|
---|
| 1181 | LWIP_ASSERT("tx_buf overflow detected", len > 0 && len <= SMTP_TX_BUF_LEN);
|
---|
| 1182 | *tx_buf_len = (u16_t)len;
|
---|
| 1183 | target[*tx_buf_len] = 0;
|
---|
| 1184 |
|
---|
| 1185 | SMEMCPY(target, SMTP_CMD_HEADER_1, SMTP_CMD_HEADER_1_LEN);
|
---|
| 1186 | target += SMTP_CMD_HEADER_1_LEN;
|
---|
| 1187 | MEMCPY(target, s->from, s->from_len);
|
---|
| 1188 | target += s->from_len;
|
---|
| 1189 | SMEMCPY(target, SMTP_CMD_HEADER_2, SMTP_CMD_HEADER_2_LEN);
|
---|
| 1190 | target += SMTP_CMD_HEADER_2_LEN;
|
---|
| 1191 | MEMCPY(target, s->to, s->to_len);
|
---|
| 1192 | target += s->to_len;
|
---|
| 1193 | SMEMCPY(target, SMTP_CMD_HEADER_3, SMTP_CMD_HEADER_3_LEN);
|
---|
| 1194 | target += SMTP_CMD_HEADER_3_LEN;
|
---|
| 1195 | MEMCPY(target, s->subject, s->subject_len);
|
---|
| 1196 | target += s->subject_len;
|
---|
| 1197 | SMEMCPY(target, SMTP_CMD_HEADER_4, SMTP_CMD_HEADER_4_LEN);
|
---|
| 1198 |
|
---|
| 1199 | return SMTP_BODY;
|
---|
| 1200 | }
|
---|
| 1201 |
|
---|
| 1202 | /** Prepare QUIT message */
|
---|
| 1203 | static enum smtp_session_state
|
---|
| 1204 | smtp_prepare_quit(struct smtp_session *s, u16_t *tx_buf_len)
|
---|
| 1205 | {
|
---|
| 1206 | *tx_buf_len = SMTP_CMD_QUIT_LEN;
|
---|
| 1207 | s->tx_buf[*tx_buf_len] = 0;
|
---|
| 1208 | SMEMCPY(s->tx_buf, SMTP_CMD_QUIT, SMTP_CMD_QUIT_LEN);
|
---|
| 1209 | LWIP_ASSERT("tx_buf overflow detected", *tx_buf_len <= SMTP_TX_BUF_LEN);
|
---|
| 1210 | return SMTP_CLOSED;
|
---|
| 1211 | }
|
---|
| 1212 |
|
---|
| 1213 | /** If in state SMTP_BODY, try to send more body data */
|
---|
| 1214 | static void
|
---|
| 1215 | smtp_send_body(struct smtp_session *s, struct altcp_pcb *pcb)
|
---|
| 1216 | {
|
---|
| 1217 | err_t err;
|
---|
| 1218 |
|
---|
| 1219 | if (s->state == SMTP_BODY) {
|
---|
| 1220 | #if SMTP_BODYDH
|
---|
| 1221 | if (s->bodydh) {
|
---|
| 1222 | smtp_send_body_data_handler(s, pcb);
|
---|
| 1223 | } else
|
---|
| 1224 | #endif /* SMTP_BODYDH */
|
---|
| 1225 | {
|
---|
| 1226 | u16_t send_len = (u16_t)(s->body_len - s->body_sent);
|
---|
| 1227 | if (send_len > 0) {
|
---|
| 1228 | u16_t snd_buf = altcp_sndbuf(pcb);
|
---|
| 1229 | if (send_len > snd_buf) {
|
---|
| 1230 | send_len = snd_buf;
|
---|
| 1231 | }
|
---|
| 1232 | if (send_len > 0) {
|
---|
| 1233 | /* try to send something out */
|
---|
| 1234 | err = altcp_write(pcb, &s->body[s->body_sent], (u16_t)send_len, TCP_WRITE_FLAG_COPY);
|
---|
| 1235 | if (err == ERR_OK) {
|
---|
| 1236 | s->timer = SMTP_TIMEOUT_DATABLOCK;
|
---|
| 1237 | s->body_sent = (u16_t)(s->body_sent + send_len);
|
---|
| 1238 | if (s->body_sent < s->body_len) {
|
---|
| 1239 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_send_body: %d of %d bytes written\n",
|
---|
| 1240 | s->body_sent, s->body_len));
|
---|
| 1241 | }
|
---|
| 1242 | }
|
---|
| 1243 | }
|
---|
| 1244 | }
|
---|
| 1245 | }
|
---|
| 1246 | if (s->body_sent == s->body_len) {
|
---|
| 1247 | /* the whole body has been written, write last line */
|
---|
| 1248 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_send_body: body completely written (%d bytes), appending end-of-body\n",
|
---|
| 1249 | s->body_len));
|
---|
| 1250 | err = altcp_write(pcb, SMTP_CMD_BODY_FINISHED, SMTP_CMD_BODY_FINISHED_LEN, 0);
|
---|
| 1251 | if (err == ERR_OK) {
|
---|
| 1252 | s->timer = SMTP_TIMEOUT_DATATERM;
|
---|
| 1253 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_send_body: end-of-body written, changing state to %s\n",
|
---|
| 1254 | smtp_state_str[SMTP_QUIT]));
|
---|
| 1255 | /* last line written, change state, wait for confirmation */
|
---|
| 1256 | s->state = SMTP_QUIT;
|
---|
| 1257 | }
|
---|
| 1258 | }
|
---|
| 1259 | }
|
---|
| 1260 | }
|
---|
| 1261 |
|
---|
| 1262 | /** State machine-like implementation of an SMTP client.
|
---|
| 1263 | */
|
---|
| 1264 | static void
|
---|
| 1265 | smtp_process(void *arg, struct altcp_pcb *pcb, struct pbuf *p)
|
---|
| 1266 | {
|
---|
| 1267 | struct smtp_session* s = (struct smtp_session*)arg;
|
---|
| 1268 | u16_t response_code = 0;
|
---|
| 1269 | u16_t tx_buf_len = 0;
|
---|
| 1270 | enum smtp_session_state next_state;
|
---|
| 1271 |
|
---|
| 1272 | if (arg == NULL) {
|
---|
| 1273 | /* already closed SMTP connection */
|
---|
| 1274 | if (p != NULL) {
|
---|
| 1275 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("Received %d bytes after closing: %s\n",
|
---|
| 1276 | p->tot_len, smtp_pbuf_str(p)));
|
---|
| 1277 | pbuf_free(p);
|
---|
| 1278 | }
|
---|
| 1279 | return;
|
---|
| 1280 | }
|
---|
| 1281 |
|
---|
| 1282 | next_state = s->state;
|
---|
| 1283 |
|
---|
| 1284 | if (p != NULL) {
|
---|
| 1285 | /* received data */
|
---|
| 1286 | if (s->p == NULL) {
|
---|
| 1287 | s->p = p;
|
---|
| 1288 | } else {
|
---|
| 1289 | pbuf_cat(s->p, p);
|
---|
| 1290 | }
|
---|
| 1291 | } else {
|
---|
| 1292 | /* idle timer, close connection if timed out */
|
---|
| 1293 | if (s->timer == 0) {
|
---|
| 1294 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("smtp_process: connection timed out, closing\n"));
|
---|
| 1295 | smtp_close(s, pcb, SMTP_RESULT_ERR_TIMEOUT, 0, ERR_TIMEOUT);
|
---|
| 1296 | return;
|
---|
| 1297 | }
|
---|
| 1298 | if (s->state == SMTP_BODY) {
|
---|
| 1299 | smtp_send_body(s, pcb);
|
---|
| 1300 | return;
|
---|
| 1301 | }
|
---|
| 1302 | }
|
---|
| 1303 | response_code = smtp_is_response(s);
|
---|
| 1304 | if (response_code) {
|
---|
| 1305 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_process: received response code: %d\n", response_code));
|
---|
| 1306 | if (smtp_is_response_finished(s) != ERR_OK) {
|
---|
| 1307 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_process: partly received response code: %d\n", response_code));
|
---|
| 1308 | /* wait for next packet to complete the respone */
|
---|
| 1309 | return;
|
---|
| 1310 | }
|
---|
| 1311 | } else {
|
---|
| 1312 | if (s->p != NULL) {
|
---|
| 1313 | LWIP_DEBUGF(SMTP_DEBUG_WARN, ("smtp_process: unknown data received (%s)\n",
|
---|
| 1314 | smtp_pbuf_str(s->p)));
|
---|
| 1315 | pbuf_free(s->p);
|
---|
| 1316 | s->p = NULL;
|
---|
| 1317 | }
|
---|
| 1318 | return;
|
---|
| 1319 | }
|
---|
| 1320 |
|
---|
| 1321 | switch(s->state)
|
---|
| 1322 | {
|
---|
| 1323 | case(SMTP_NULL):
|
---|
| 1324 | /* wait for 220 */
|
---|
| 1325 | if (response_code == 220) {
|
---|
| 1326 | /* then send EHLO */
|
---|
| 1327 | next_state = smtp_prepare_helo(s, &tx_buf_len, pcb);
|
---|
| 1328 | }
|
---|
| 1329 | break;
|
---|
| 1330 | case(SMTP_HELO):
|
---|
| 1331 | /* wait for 250 */
|
---|
| 1332 | if (response_code == 250) {
|
---|
| 1333 | #if SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN
|
---|
| 1334 | /* then send AUTH or MAIL */
|
---|
| 1335 | next_state = smtp_prepare_auth_or_mail(s, &tx_buf_len);
|
---|
| 1336 | }
|
---|
| 1337 | break;
|
---|
| 1338 | case(SMTP_AUTH_LOGIN):
|
---|
| 1339 | case(SMTP_AUTH_PLAIN):
|
---|
| 1340 | /* wait for 235 */
|
---|
| 1341 | if (response_code == 235) {
|
---|
| 1342 | #endif /* SMTP_SUPPORT_AUTH_PLAIN || SMTP_SUPPORT_AUTH_LOGIN */
|
---|
| 1343 | /* send MAIL */
|
---|
| 1344 | next_state = smtp_prepare_mail(s, &tx_buf_len);
|
---|
| 1345 | }
|
---|
| 1346 | break;
|
---|
| 1347 | #if SMTP_SUPPORT_AUTH_LOGIN
|
---|
| 1348 | case(SMTP_AUTH_LOGIN_UNAME):
|
---|
| 1349 | /* wait for 334 Username */
|
---|
| 1350 | if (response_code == 334) {
|
---|
| 1351 | if (pbuf_strstr(s->p, SMTP_RESP_LOGIN_UNAME) != 0xFFFF) {
|
---|
| 1352 | /* send username */
|
---|
| 1353 | next_state = smtp_prepare_auth_login_uname(s, &tx_buf_len);
|
---|
| 1354 | }
|
---|
| 1355 | }
|
---|
| 1356 | break;
|
---|
| 1357 | case(SMTP_AUTH_LOGIN_PASS):
|
---|
| 1358 | /* wait for 334 Password */
|
---|
| 1359 | if (response_code == 334) {
|
---|
| 1360 | if (pbuf_strstr(s->p, SMTP_RESP_LOGIN_PASS) != 0xFFFF) {
|
---|
| 1361 | /* send username */
|
---|
| 1362 | next_state = smtp_prepare_auth_login_pass(s, &tx_buf_len);
|
---|
| 1363 | }
|
---|
| 1364 | }
|
---|
| 1365 | break;
|
---|
| 1366 | #endif /* SMTP_SUPPORT_AUTH_LOGIN */
|
---|
| 1367 | case(SMTP_MAIL):
|
---|
| 1368 | /* wait for 250 */
|
---|
| 1369 | if (response_code == 250) {
|
---|
| 1370 | /* send RCPT */
|
---|
| 1371 | next_state = smtp_prepare_rcpt(s, &tx_buf_len);
|
---|
| 1372 | }
|
---|
| 1373 | break;
|
---|
| 1374 | case(SMTP_RCPT):
|
---|
| 1375 | /* wait for 250 */
|
---|
| 1376 | if (response_code == 250) {
|
---|
| 1377 | /* send DATA */
|
---|
| 1378 | SMEMCPY(s->tx_buf, SMTP_CMD_DATA, SMTP_CMD_DATA_LEN);
|
---|
| 1379 | tx_buf_len = SMTP_CMD_DATA_LEN;
|
---|
| 1380 | next_state = SMTP_DATA;
|
---|
| 1381 | }
|
---|
| 1382 | break;
|
---|
| 1383 | case(SMTP_DATA):
|
---|
| 1384 | /* wait for 354 */
|
---|
| 1385 | if (response_code == 354) {
|
---|
| 1386 | /* send email header */
|
---|
| 1387 | next_state = smtp_prepare_header(s, &tx_buf_len);
|
---|
| 1388 | }
|
---|
| 1389 | break;
|
---|
| 1390 | case(SMTP_BODY):
|
---|
| 1391 | /* nothing to be done here, handled somewhere else */
|
---|
| 1392 | break;
|
---|
| 1393 | case(SMTP_QUIT):
|
---|
| 1394 | /* wait for 250 */
|
---|
| 1395 | if (response_code == 250) {
|
---|
| 1396 | /* send QUIT */
|
---|
| 1397 | next_state = smtp_prepare_quit(s, &tx_buf_len);
|
---|
| 1398 | }
|
---|
| 1399 | break;
|
---|
| 1400 | case(SMTP_CLOSED):
|
---|
| 1401 | /* nothing to do, wait for connection closed from server */
|
---|
| 1402 | return;
|
---|
| 1403 | default:
|
---|
| 1404 | LWIP_DEBUGF(SMTP_DEBUG_SERIOUS, ("Invalid state: %d/%s\n", (int)s->state,
|
---|
| 1405 | smtp_state_str[s->state]));
|
---|
| 1406 | break;
|
---|
| 1407 | }
|
---|
| 1408 | if (s->state == next_state) {
|
---|
| 1409 | LWIP_DEBUGF(SMTP_DEBUG_WARN_STATE, ("smtp_process[%s]: unexpected response_code, closing: %d (%s)\n",
|
---|
| 1410 | smtp_state_str[s->state], response_code, smtp_pbuf_str(s->p)));
|
---|
| 1411 | /* close connection */
|
---|
| 1412 | smtp_close(s, pcb, SMTP_RESULT_ERR_SVR_RESP, response_code, ERR_OK);
|
---|
| 1413 | return;
|
---|
| 1414 | }
|
---|
| 1415 | if (tx_buf_len > 0) {
|
---|
| 1416 | SMTP_TX_BUF_MAX(tx_buf_len);
|
---|
| 1417 | if (altcp_write(pcb, s->tx_buf, tx_buf_len, TCP_WRITE_FLAG_COPY) == ERR_OK) {
|
---|
| 1418 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_process[%s]: received command %d (%s)\n",
|
---|
| 1419 | smtp_state_str[s->state], response_code, smtp_pbuf_str(s->p)));
|
---|
| 1420 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_process[%s]: sent %"U16_F" bytes: \"%s\"\n",
|
---|
| 1421 | smtp_state_str[s->state], tx_buf_len, s->tx_buf));
|
---|
| 1422 | s->timer = SMTP_TIMEOUT;
|
---|
| 1423 | pbuf_free(s->p);
|
---|
| 1424 | s->p = NULL;
|
---|
| 1425 | LWIP_DEBUGF(SMTP_DEBUG_STATE, ("smtp_process: changing state from %s to %s\n",
|
---|
| 1426 | smtp_state_str[s->state], smtp_state_str[next_state]));
|
---|
| 1427 | s->state = next_state;
|
---|
| 1428 | if (next_state == SMTP_BODY) {
|
---|
| 1429 | /* try to stream-send body data right now */
|
---|
| 1430 | smtp_send_body(s, pcb);
|
---|
| 1431 | } else if (next_state == SMTP_CLOSED) {
|
---|
| 1432 | /* sent out all data, delete structure */
|
---|
| 1433 | altcp_arg(pcb, NULL);
|
---|
| 1434 | smtp_free(s, SMTP_RESULT_OK, 0, ERR_OK);
|
---|
| 1435 | }
|
---|
| 1436 | }
|
---|
| 1437 | }
|
---|
| 1438 | }
|
---|
| 1439 |
|
---|
| 1440 | #if SMTP_BODYDH
|
---|
| 1441 | /** Elementary sub-function to send data
|
---|
| 1442 | *
|
---|
| 1443 | * @returns: BDHALLDATASENT all data has been written
|
---|
| 1444 | * BDHSOMEDATASENT some data has been written
|
---|
| 1445 | * 0 no data has been written
|
---|
| 1446 | */
|
---|
| 1447 | static int
|
---|
| 1448 | smtp_send_bodyh_data(struct altcp_pcb *pcb, const char **from, u16_t *howmany)
|
---|
| 1449 | {
|
---|
| 1450 | err_t err;
|
---|
| 1451 | u16_t len = *howmany;
|
---|
| 1452 |
|
---|
| 1453 | len = (u16_t)LWIP_MIN(len, altcp_sndbuf(pcb));
|
---|
| 1454 | err = altcp_write(pcb, *from, len, TCP_WRITE_FLAG_COPY);
|
---|
| 1455 | if (err == ERR_OK) {
|
---|
| 1456 | *from += len;
|
---|
| 1457 | if ((*howmany -= len) > 0) {
|
---|
| 1458 | return BDHSOMEDATASENT;
|
---|
| 1459 | }
|
---|
| 1460 | return BDHALLDATASENT;
|
---|
| 1461 | }
|
---|
| 1462 | return 0;
|
---|
| 1463 | }
|
---|
| 1464 |
|
---|
| 1465 | /** Same as smtp_send_mail_static, but uses a callback function to send body data
|
---|
| 1466 | */
|
---|
| 1467 | err_t
|
---|
| 1468 | smtp_send_mail_bodycback(const char *from, const char* to, const char* subject,
|
---|
| 1469 | smtp_bodycback_fn bodycback_fn, smtp_result_fn callback_fn, void* callback_arg)
|
---|
| 1470 | {
|
---|
| 1471 | struct smtp_session* s;
|
---|
| 1472 | size_t len;
|
---|
| 1473 |
|
---|
| 1474 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 1475 |
|
---|
| 1476 | s = (struct smtp_session*)SMTP_STATE_MALLOC(sizeof(struct smtp_session));
|
---|
| 1477 | if (s == NULL) {
|
---|
| 1478 | return ERR_MEM;
|
---|
| 1479 | }
|
---|
| 1480 | memset(s, 0, sizeof(struct smtp_session));
|
---|
| 1481 | s->bodydh = (struct smtp_bodydh_state*)SMTP_BODYDH_MALLOC(sizeof(struct smtp_bodydh_state));
|
---|
| 1482 | if (s->bodydh == NULL) {
|
---|
| 1483 | SMTP_STATE_FREE(s);
|
---|
| 1484 | return ERR_MEM;
|
---|
| 1485 | }
|
---|
| 1486 | memset(s->bodydh, 0, sizeof(struct smtp_bodydh_state));
|
---|
| 1487 | /* initialize the structure */
|
---|
| 1488 | s->from = from;
|
---|
| 1489 | len = strlen(from);
|
---|
| 1490 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 1491 | s->from_len = (u16_t)len;
|
---|
| 1492 | s->to = to;
|
---|
| 1493 | len = strlen(to);
|
---|
| 1494 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 1495 | s->to_len = (u16_t)len;
|
---|
| 1496 | s->subject = subject;
|
---|
| 1497 | len = strlen(subject);
|
---|
| 1498 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 1499 | s->subject_len = (u16_t)len;
|
---|
| 1500 | s->body = NULL;
|
---|
| 1501 | LWIP_ASSERT("string is too long", len <= 0xffff);
|
---|
| 1502 | s->callback_fn = callback_fn;
|
---|
| 1503 | s->callback_arg = callback_arg;
|
---|
| 1504 | s->bodydh->callback_fn = bodycback_fn;
|
---|
| 1505 | s->bodydh->state = BDH_SENDING;
|
---|
| 1506 | /* call the actual implementation of this function */
|
---|
| 1507 | return smtp_send_mail_alloced(s);
|
---|
| 1508 | }
|
---|
| 1509 |
|
---|
| 1510 | static void
|
---|
| 1511 | smtp_send_body_data_handler(struct smtp_session *s, struct altcp_pcb *pcb)
|
---|
| 1512 | {
|
---|
| 1513 | struct smtp_bodydh_state *bdh;
|
---|
| 1514 | int res = 0, ret;
|
---|
| 1515 | LWIP_ASSERT("s != NULL", s != NULL);
|
---|
| 1516 | bdh = s->bodydh;
|
---|
| 1517 | LWIP_ASSERT("bodydh != NULL", bdh != NULL);
|
---|
| 1518 |
|
---|
| 1519 | /* resume any leftovers from prior memory constraints */
|
---|
| 1520 | if (s->body_len) {
|
---|
| 1521 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_send_body_data_handler: resume\n"));
|
---|
| 1522 | if((res = smtp_send_bodyh_data(pcb, (const char **)&s->body, &s->body_len))
|
---|
| 1523 | != BDHALLDATASENT) {
|
---|
| 1524 | s->body_sent = s->body_len - 1;
|
---|
| 1525 | return;
|
---|
| 1526 | }
|
---|
| 1527 | }
|
---|
| 1528 | ret = res;
|
---|
| 1529 | /* all data on buffer has been queued, resume execution */
|
---|
| 1530 | if (bdh->state == BDH_SENDING) {
|
---|
| 1531 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_send_body_data_handler: run\n"));
|
---|
| 1532 | do {
|
---|
| 1533 | ret |= res; /* remember if we once queued something to send */
|
---|
| 1534 | bdh->exposed.length = 0;
|
---|
| 1535 | if (bdh->callback_fn(s->callback_arg, &bdh->exposed) == BDH_DONE) {
|
---|
| 1536 | bdh->state = BDH_STOP;
|
---|
| 1537 | }
|
---|
| 1538 | s->body = bdh->exposed.buffer;
|
---|
| 1539 | s->body_len = bdh->exposed.length;
|
---|
| 1540 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_send_body_data_handler: trying to send %u bytes\n", (unsigned int)s->body_len));
|
---|
| 1541 | } while (s->body_len &&
|
---|
| 1542 | ((res = smtp_send_bodyh_data(pcb, (const char **)&s->body, &s->body_len)) == BDHALLDATASENT)
|
---|
| 1543 | && (bdh->state != BDH_STOP));
|
---|
| 1544 | }
|
---|
| 1545 | if ((bdh->state != BDH_SENDING) && (ret != BDHSOMEDATASENT)) {
|
---|
| 1546 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_send_body_data_handler: stop\n"));
|
---|
| 1547 | s->body_sent = s->body_len;
|
---|
| 1548 | } else {
|
---|
| 1549 | LWIP_DEBUGF(SMTP_DEBUG_TRACE, ("smtp_send_body_data_handler: pause\n"));
|
---|
| 1550 | s->body_sent = s->body_len - 1;
|
---|
| 1551 | }
|
---|
| 1552 | }
|
---|
| 1553 | #endif /* SMTP_BODYDH */
|
---|
| 1554 |
|
---|
| 1555 | #endif /* LWIP_TCP && LWIP_CALLBACK_API */
|
---|