1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | * RFC1734 POP3 Authentication
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22 | * RFC1939 POP3 protocol
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23 | * RFC2195 CRAM-MD5 authentication
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24 | * RFC2384 POP URL Scheme
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25 | * RFC2449 POP3 Extension Mechanism
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26 | * RFC2595 Using TLS with IMAP, POP3 and ACAP
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27 | * RFC2831 DIGEST-MD5 authentication
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28 | * RFC4422 Simple Authentication and Security Layer (SASL)
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29 | * RFC4616 PLAIN authentication
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30 | * RFC4752 The Kerberos V5 ("GSSAPI") SASL Mechanism
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31 | * RFC5034 POP3 SASL Authentication Mechanism
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32 | * RFC6749 OAuth 2.0 Authorization Framework
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33 | * Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
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34 | *
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35 | ***************************************************************************/
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36 |
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37 | #include "curl_setup.h"
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38 |
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39 | #ifndef CURL_DISABLE_POP3
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40 |
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41 | #ifdef HAVE_NETINET_IN_H
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42 | #include <netinet/in.h>
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43 | #endif
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44 | #ifdef HAVE_ARPA_INET_H
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45 | #include <arpa/inet.h>
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46 | #endif
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47 | #ifdef HAVE_UTSNAME_H
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48 | #include <sys/utsname.h>
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49 | #endif
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50 | #ifdef HAVE_NETDB_H
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51 | #include <netdb.h>
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52 | #endif
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53 | #ifdef __VMS
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54 | #include <in.h>
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55 | #include <inet.h>
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56 | #endif
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57 |
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58 | #if (defined(NETWARE) && defined(__NOVELL_LIBC__))
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59 | #undef in_addr_t
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60 | #define in_addr_t unsigned long
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61 | #endif
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62 |
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63 | #include <curl/curl.h>
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64 | #include "urldata.h"
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65 | #include "sendf.h"
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66 | #include "hostip.h"
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67 | #include "progress.h"
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68 | #include "transfer.h"
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69 | #include "escape.h"
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70 | #include "http.h" /* for HTTP proxy tunnel stuff */
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71 | #include "socks.h"
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72 | #include "pop3.h"
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73 |
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74 | #include "strtoofft.h"
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75 | #include "strequal.h"
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76 | #include "vtls/vtls.h"
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77 | #include "connect.h"
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78 | #include "strerror.h"
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79 | #include "select.h"
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80 | #include "multiif.h"
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81 | #include "url.h"
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82 | #include "rawstr.h"
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83 | #include "curl_sasl.h"
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84 | #include "curl_md5.h"
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85 | #include "warnless.h"
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86 | #include "curl_printf.h"
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87 | #include "curl_memory.h"
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88 | /* The last #include file should be: */
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89 | #include "memdebug.h"
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90 |
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91 | /* Local API functions */
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92 | static CURLcode pop3_regular_transfer(struct connectdata *conn, bool *done);
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93 | static CURLcode pop3_do(struct connectdata *conn, bool *done);
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94 | static CURLcode pop3_done(struct connectdata *conn, CURLcode status,
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95 | bool premature);
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96 | static CURLcode pop3_connect(struct connectdata *conn, bool *done);
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97 | static CURLcode pop3_disconnect(struct connectdata *conn, bool dead);
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98 | static CURLcode pop3_multi_statemach(struct connectdata *conn, bool *done);
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99 | static int pop3_getsock(struct connectdata *conn, curl_socket_t *socks,
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100 | int numsocks);
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101 | static CURLcode pop3_doing(struct connectdata *conn, bool *dophase_done);
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102 | static CURLcode pop3_setup_connection(struct connectdata *conn);
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103 | static CURLcode pop3_parse_url_options(struct connectdata *conn);
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104 | static CURLcode pop3_parse_url_path(struct connectdata *conn);
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105 | static CURLcode pop3_parse_custom_request(struct connectdata *conn);
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106 | static CURLcode pop3_perform_auth(struct connectdata *conn, const char *mech,
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107 | const char *initresp);
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108 | static CURLcode pop3_continue_auth(struct connectdata *conn, const char *resp);
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109 | static void pop3_get_message(char *buffer, char** outptr);
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110 |
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111 | /*
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112 | * POP3 protocol handler.
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113 | */
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114 |
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115 | const struct Curl_handler Curl_handler_pop3 = {
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116 | "POP3", /* scheme */
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117 | pop3_setup_connection, /* setup_connection */
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118 | pop3_do, /* do_it */
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119 | pop3_done, /* done */
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120 | ZERO_NULL, /* do_more */
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121 | pop3_connect, /* connect_it */
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122 | pop3_multi_statemach, /* connecting */
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123 | pop3_doing, /* doing */
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124 | pop3_getsock, /* proto_getsock */
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125 | pop3_getsock, /* doing_getsock */
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126 | ZERO_NULL, /* domore_getsock */
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127 | ZERO_NULL, /* perform_getsock */
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128 | pop3_disconnect, /* disconnect */
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129 | ZERO_NULL, /* readwrite */
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130 | PORT_POP3, /* defport */
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131 | CURLPROTO_POP3, /* protocol */
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132 | PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY /* flags */
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133 | };
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134 |
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135 | #ifdef USE_SSL
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136 | /*
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137 | * POP3S protocol handler.
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138 | */
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139 |
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140 | const struct Curl_handler Curl_handler_pop3s = {
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141 | "POP3S", /* scheme */
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142 | pop3_setup_connection, /* setup_connection */
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143 | pop3_do, /* do_it */
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144 | pop3_done, /* done */
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145 | ZERO_NULL, /* do_more */
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146 | pop3_connect, /* connect_it */
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147 | pop3_multi_statemach, /* connecting */
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148 | pop3_doing, /* doing */
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149 | pop3_getsock, /* proto_getsock */
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150 | pop3_getsock, /* doing_getsock */
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151 | ZERO_NULL, /* domore_getsock */
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152 | ZERO_NULL, /* perform_getsock */
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153 | pop3_disconnect, /* disconnect */
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154 | ZERO_NULL, /* readwrite */
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155 | PORT_POP3S, /* defport */
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156 | CURLPROTO_POP3S, /* protocol */
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157 | PROTOPT_CLOSEACTION | PROTOPT_SSL
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158 | | PROTOPT_NOURLQUERY /* flags */
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159 | };
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160 | #endif
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161 |
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162 | #ifndef CURL_DISABLE_HTTP
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163 | /*
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164 | * HTTP-proxyed POP3 protocol handler.
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165 | */
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166 |
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167 | static const struct Curl_handler Curl_handler_pop3_proxy = {
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168 | "POP3", /* scheme */
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169 | Curl_http_setup_conn, /* setup_connection */
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170 | Curl_http, /* do_it */
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171 | Curl_http_done, /* done */
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172 | ZERO_NULL, /* do_more */
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173 | ZERO_NULL, /* connect_it */
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174 | ZERO_NULL, /* connecting */
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175 | ZERO_NULL, /* doing */
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176 | ZERO_NULL, /* proto_getsock */
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177 | ZERO_NULL, /* doing_getsock */
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178 | ZERO_NULL, /* domore_getsock */
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179 | ZERO_NULL, /* perform_getsock */
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180 | ZERO_NULL, /* disconnect */
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181 | ZERO_NULL, /* readwrite */
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182 | PORT_POP3, /* defport */
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183 | CURLPROTO_HTTP, /* protocol */
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184 | PROTOPT_NONE /* flags */
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185 | };
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186 |
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187 | #ifdef USE_SSL
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188 | /*
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189 | * HTTP-proxyed POP3S protocol handler.
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190 | */
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191 |
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192 | static const struct Curl_handler Curl_handler_pop3s_proxy = {
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193 | "POP3S", /* scheme */
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194 | Curl_http_setup_conn, /* setup_connection */
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195 | Curl_http, /* do_it */
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196 | Curl_http_done, /* done */
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197 | ZERO_NULL, /* do_more */
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198 | ZERO_NULL, /* connect_it */
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199 | ZERO_NULL, /* connecting */
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200 | ZERO_NULL, /* doing */
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201 | ZERO_NULL, /* proto_getsock */
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202 | ZERO_NULL, /* doing_getsock */
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203 | ZERO_NULL, /* domore_getsock */
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204 | ZERO_NULL, /* perform_getsock */
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205 | ZERO_NULL, /* disconnect */
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206 | ZERO_NULL, /* readwrite */
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207 | PORT_POP3S, /* defport */
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208 | CURLPROTO_HTTP, /* protocol */
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209 | PROTOPT_NONE /* flags */
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210 | };
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211 | #endif
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212 | #endif
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213 |
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214 | /* SASL parameters for the pop3 protocol */
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215 | static const struct SASLproto saslpop3 = {
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216 | "pop", /* The service name */
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217 | '*', /* Code received when continuation is expected */
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218 | '+', /* Code to receive upon authentication success */
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219 | 255 - 8, /* Maximum initial response length (no max) */
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220 | pop3_perform_auth, /* Send authentication command */
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221 | pop3_continue_auth, /* Send authentication continuation */
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222 | pop3_get_message /* Get SASL response message */
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223 | };
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224 |
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225 | #ifdef USE_SSL
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226 | static void pop3_to_pop3s(struct connectdata *conn)
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227 | {
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228 | conn->handler = &Curl_handler_pop3s;
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229 | }
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230 | #else
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231 | #define pop3_to_pop3s(x) Curl_nop_stmt
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232 | #endif
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233 |
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234 | /***********************************************************************
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235 | *
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236 | * pop3_endofresp()
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237 | *
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238 | * Checks for an ending POP3 status code at the start of the given string, but
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239 | * also detects the APOP timestamp from the server greeting and various
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240 | * capabilities from the CAPA response including the supported authentication
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241 | * types and allowed SASL mechanisms.
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242 | */
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243 | static bool pop3_endofresp(struct connectdata *conn, char *line, size_t len,
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244 | int *resp)
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245 | {
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246 | struct pop3_conn *pop3c = &conn->proto.pop3c;
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247 |
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248 | /* Do we have an error response? */
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249 | if(len >= 4 && !memcmp("-ERR", line, 4)) {
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250 | *resp = '-';
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251 |
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252 | return TRUE;
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253 | }
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254 |
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255 | /* Are we processing CAPA command responses? */
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256 | if(pop3c->state == POP3_CAPA) {
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257 | /* Do we have the terminating line? */
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258 | if(len >= 1 && !memcmp(line, ".", 1))
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259 | /* Treat the response as a success */
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260 | *resp = '+';
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261 | else
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262 | /* Treat the response as an untagged continuation */
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263 | *resp = '*';
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264 |
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265 | return TRUE;
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266 | }
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267 |
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268 | /* Do we have a success response? */
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269 | if(len >= 3 && !memcmp("+OK", line, 3)) {
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270 | *resp = '+';
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271 |
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272 | return TRUE;
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273 | }
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274 |
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275 | /* Do we have a continuation response? */
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276 | if(len >= 1 && !memcmp("+", line, 1)) {
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277 | *resp = '*';
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278 |
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279 | return TRUE;
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280 | }
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281 |
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282 | return FALSE; /* Nothing for us */
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283 | }
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284 |
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285 | /***********************************************************************
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286 | *
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287 | * pop3_get_message()
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288 | *
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289 | * Gets the authentication message from the response buffer.
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290 | */
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291 | static void pop3_get_message(char *buffer, char** outptr)
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292 | {
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293 | size_t len = 0;
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294 | char* message = NULL;
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295 |
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296 | /* Find the start of the message */
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297 | for(message = buffer + 2; *message == ' ' || *message == '\t'; message++)
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298 | ;
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299 |
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300 | /* Find the end of the message */
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301 | for(len = strlen(message); len--;)
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302 | if(message[len] != '\r' && message[len] != '\n' && message[len] != ' ' &&
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303 | message[len] != '\t')
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304 | break;
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305 |
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306 | /* Terminate the message */
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307 | if(++len) {
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308 | message[len] = '\0';
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309 | }
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310 |
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311 | *outptr = message;
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312 | }
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313 |
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314 | /***********************************************************************
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315 | *
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316 | * state()
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317 | *
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318 | * This is the ONLY way to change POP3 state!
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319 | */
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320 | static void state(struct connectdata *conn, pop3state newstate)
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321 | {
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322 | struct pop3_conn *pop3c = &conn->proto.pop3c;
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323 | #if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
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324 | /* for debug purposes */
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325 | static const char * const names[] = {
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326 | "STOP",
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327 | "SERVERGREET",
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328 | "CAPA",
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329 | "STARTTLS",
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330 | "UPGRADETLS",
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331 | "AUTH",
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332 | "APOP",
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333 | "USER",
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334 | "PASS",
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335 | "COMMAND",
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336 | "QUIT",
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337 | /* LAST */
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338 | };
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339 |
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340 | if(pop3c->state != newstate)
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341 | infof(conn->data, "POP3 %p state change from %s to %s\n",
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342 | (void *)pop3c, names[pop3c->state], names[newstate]);
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343 | #endif
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344 |
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345 | pop3c->state = newstate;
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346 | }
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347 |
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348 | /***********************************************************************
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349 | *
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350 | * pop3_perform_capa()
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351 | *
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352 | * Sends the CAPA command in order to obtain a list of server side supported
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353 | * capabilities.
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354 | */
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355 | static CURLcode pop3_perform_capa(struct connectdata *conn)
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356 | {
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357 | CURLcode result = CURLE_OK;
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358 | struct pop3_conn *pop3c = &conn->proto.pop3c;
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359 |
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360 | pop3c->sasl.authmechs = SASL_AUTH_NONE; /* No known auth. mechanisms yet */
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361 | pop3c->sasl.authused = SASL_AUTH_NONE; /* Clear the auth. mechanism used */
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362 | pop3c->tls_supported = FALSE; /* Clear the TLS capability */
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363 |
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364 | /* Send the CAPA command */
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365 | result = Curl_pp_sendf(&pop3c->pp, "%s", "CAPA");
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366 |
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367 | if(!result)
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368 | state(conn, POP3_CAPA);
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369 |
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370 | return result;
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371 | }
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372 |
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373 | /***********************************************************************
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374 | *
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375 | * pop3_perform_starttls()
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376 | *
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377 | * Sends the STLS command to start the upgrade to TLS.
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378 | */
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379 | static CURLcode pop3_perform_starttls(struct connectdata *conn)
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380 | {
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381 | CURLcode result = CURLE_OK;
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382 |
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383 | /* Send the STLS command */
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384 | result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", "STLS");
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385 |
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386 | if(!result)
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387 | state(conn, POP3_STARTTLS);
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388 |
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389 | return result;
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390 | }
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391 |
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392 | /***********************************************************************
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393 | *
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394 | * pop3_perform_upgrade_tls()
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395 | *
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396 | * Performs the upgrade to TLS.
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397 | */
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398 | static CURLcode pop3_perform_upgrade_tls(struct connectdata *conn)
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399 | {
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400 | CURLcode result = CURLE_OK;
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401 | struct pop3_conn *pop3c = &conn->proto.pop3c;
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402 |
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403 | /* Start the SSL connection */
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404 | result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &pop3c->ssldone);
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405 |
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406 | if(!result) {
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407 | if(pop3c->state != POP3_UPGRADETLS)
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408 | state(conn, POP3_UPGRADETLS);
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409 |
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410 | if(pop3c->ssldone) {
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411 | pop3_to_pop3s(conn);
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412 | result = pop3_perform_capa(conn);
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413 | }
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414 | }
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415 |
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416 | return result;
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417 | }
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418 |
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419 | /***********************************************************************
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420 | *
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421 | * pop3_perform_user()
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422 | *
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423 | * Sends a clear text USER command to authenticate with.
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424 | */
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425 | static CURLcode pop3_perform_user(struct connectdata *conn)
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426 | {
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427 | CURLcode result = CURLE_OK;
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428 |
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429 | /* Check we have a username and password to authenticate with and end the
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430 | connect phase if we don't */
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431 | if(!conn->bits.user_passwd) {
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432 | state(conn, POP3_STOP);
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433 |
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434 | return result;
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435 | }
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436 |
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437 | /* Send the USER command */
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438 | result = Curl_pp_sendf(&conn->proto.pop3c.pp, "USER %s",
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439 | conn->user ? conn->user : "");
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440 | if(!result)
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441 | state(conn, POP3_USER);
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442 |
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443 | return result;
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444 | }
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445 |
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446 | #ifndef CURL_DISABLE_CRYPTO_AUTH
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447 | /***********************************************************************
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448 | *
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449 | * pop3_perform_apop()
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450 | *
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451 | * Sends an APOP command to authenticate with.
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452 | */
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453 | static CURLcode pop3_perform_apop(struct connectdata *conn)
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454 | {
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455 | CURLcode result = CURLE_OK;
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456 | struct pop3_conn *pop3c = &conn->proto.pop3c;
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457 | size_t i;
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458 | MD5_context *ctxt;
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459 | unsigned char digest[MD5_DIGEST_LEN];
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460 | char secret[2 * MD5_DIGEST_LEN + 1];
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461 |
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462 | /* Check we have a username and password to authenticate with and end the
|
---|
463 | connect phase if we don't */
|
---|
464 | if(!conn->bits.user_passwd) {
|
---|
465 | state(conn, POP3_STOP);
|
---|
466 |
|
---|
467 | return result;
|
---|
468 | }
|
---|
469 |
|
---|
470 | /* Create the digest */
|
---|
471 | ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
|
---|
472 | if(!ctxt)
|
---|
473 | return CURLE_OUT_OF_MEMORY;
|
---|
474 |
|
---|
475 | Curl_MD5_update(ctxt, (const unsigned char *) pop3c->apoptimestamp,
|
---|
476 | curlx_uztoui(strlen(pop3c->apoptimestamp)));
|
---|
477 |
|
---|
478 | Curl_MD5_update(ctxt, (const unsigned char *) conn->passwd,
|
---|
479 | curlx_uztoui(strlen(conn->passwd)));
|
---|
480 |
|
---|
481 | /* Finalise the digest */
|
---|
482 | Curl_MD5_final(ctxt, digest);
|
---|
483 |
|
---|
484 | /* Convert the calculated 16 octet digest into a 32 byte hex string */
|
---|
485 | for(i = 0; i < MD5_DIGEST_LEN; i++)
|
---|
486 | snprintf(&secret[2 * i], 3, "%02x", digest[i]);
|
---|
487 |
|
---|
488 | result = Curl_pp_sendf(&pop3c->pp, "APOP %s %s", conn->user, secret);
|
---|
489 |
|
---|
490 | if(!result)
|
---|
491 | state(conn, POP3_APOP);
|
---|
492 |
|
---|
493 | return result;
|
---|
494 | }
|
---|
495 | #endif
|
---|
496 |
|
---|
497 | /***********************************************************************
|
---|
498 | *
|
---|
499 | * pop3_perform_auth()
|
---|
500 | *
|
---|
501 | * Sends an AUTH command allowing the client to login with the given SASL
|
---|
502 | * authentication mechanism.
|
---|
503 | */
|
---|
504 | static CURLcode pop3_perform_auth(struct connectdata *conn,
|
---|
505 | const char *mech,
|
---|
506 | const char *initresp)
|
---|
507 | {
|
---|
508 | CURLcode result = CURLE_OK;
|
---|
509 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
510 |
|
---|
511 | if(initresp) { /* AUTH <mech> ...<crlf> */
|
---|
512 | /* Send the AUTH command with the initial response */
|
---|
513 | result = Curl_pp_sendf(&pop3c->pp, "AUTH %s %s", mech, initresp);
|
---|
514 | }
|
---|
515 | else {
|
---|
516 | /* Send the AUTH command */
|
---|
517 | result = Curl_pp_sendf(&pop3c->pp, "AUTH %s", mech);
|
---|
518 | }
|
---|
519 |
|
---|
520 | return result;
|
---|
521 | }
|
---|
522 |
|
---|
523 | /***********************************************************************
|
---|
524 | *
|
---|
525 | * pop3_continue_auth()
|
---|
526 | *
|
---|
527 | * Sends SASL continuation data or cancellation.
|
---|
528 | */
|
---|
529 | static CURLcode pop3_continue_auth(struct connectdata *conn,
|
---|
530 | const char *resp)
|
---|
531 | {
|
---|
532 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
533 |
|
---|
534 | return Curl_pp_sendf(&pop3c->pp, "%s", resp);
|
---|
535 | }
|
---|
536 |
|
---|
537 | /***********************************************************************
|
---|
538 | *
|
---|
539 | * pop3_perform_authentication()
|
---|
540 | *
|
---|
541 | * Initiates the authentication sequence, with the appropriate SASL
|
---|
542 | * authentication mechanism, falling back to APOP and clear text should a
|
---|
543 | * common mechanism not be available between the client and server.
|
---|
544 | */
|
---|
545 | static CURLcode pop3_perform_authentication(struct connectdata *conn)
|
---|
546 | {
|
---|
547 | CURLcode result = CURLE_OK;
|
---|
548 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
549 | saslprogress progress = SASL_IDLE;
|
---|
550 |
|
---|
551 | /* Check we have enough data to authenticate with and end the
|
---|
552 | connect phase if we don't */
|
---|
553 | if(!Curl_sasl_can_authenticate(&pop3c->sasl, conn)) {
|
---|
554 | state(conn, POP3_STOP);
|
---|
555 | return result;
|
---|
556 | }
|
---|
557 |
|
---|
558 | if(pop3c->authtypes & pop3c->preftype & POP3_TYPE_SASL) {
|
---|
559 | /* Calculate the SASL login details */
|
---|
560 | result = Curl_sasl_start(&pop3c->sasl, conn, FALSE, &progress);
|
---|
561 |
|
---|
562 | if(!result)
|
---|
563 | if(progress == SASL_INPROGRESS)
|
---|
564 | state(conn, POP3_AUTH);
|
---|
565 | }
|
---|
566 |
|
---|
567 | if(!result && progress == SASL_IDLE) {
|
---|
568 | #ifndef CURL_DISABLE_CRYPTO_AUTH
|
---|
569 | if(pop3c->authtypes & pop3c->preftype & POP3_TYPE_APOP)
|
---|
570 | /* Perform APOP authentication */
|
---|
571 | result = pop3_perform_apop(conn);
|
---|
572 | else
|
---|
573 | #endif
|
---|
574 | if(pop3c->authtypes & pop3c->preftype & POP3_TYPE_CLEARTEXT)
|
---|
575 | /* Perform clear text authentication */
|
---|
576 | result = pop3_perform_user(conn);
|
---|
577 | else {
|
---|
578 | /* Other mechanisms not supported */
|
---|
579 | infof(conn->data, "No known authentication mechanisms supported!\n");
|
---|
580 | result = CURLE_LOGIN_DENIED;
|
---|
581 | }
|
---|
582 | }
|
---|
583 |
|
---|
584 | return result;
|
---|
585 | }
|
---|
586 |
|
---|
587 | /***********************************************************************
|
---|
588 | *
|
---|
589 | * pop3_perform_command()
|
---|
590 | *
|
---|
591 | * Sends a POP3 based command.
|
---|
592 | */
|
---|
593 | static CURLcode pop3_perform_command(struct connectdata *conn)
|
---|
594 | {
|
---|
595 | CURLcode result = CURLE_OK;
|
---|
596 | struct SessionHandle *data = conn->data;
|
---|
597 | struct POP3 *pop3 = data->req.protop;
|
---|
598 | const char *command = NULL;
|
---|
599 |
|
---|
600 | /* Calculate the default command */
|
---|
601 | if(pop3->id[0] == '\0' || conn->data->set.ftp_list_only) {
|
---|
602 | command = "LIST";
|
---|
603 |
|
---|
604 | if(pop3->id[0] != '\0')
|
---|
605 | /* Message specific LIST so skip the BODY transfer */
|
---|
606 | pop3->transfer = FTPTRANSFER_INFO;
|
---|
607 | }
|
---|
608 | else
|
---|
609 | command = "RETR";
|
---|
610 |
|
---|
611 | /* Send the command */
|
---|
612 | if(pop3->id[0] != '\0')
|
---|
613 | result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s %s",
|
---|
614 | (pop3->custom && pop3->custom[0] != '\0' ?
|
---|
615 | pop3->custom : command), pop3->id);
|
---|
616 | else
|
---|
617 | result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s",
|
---|
618 | (pop3->custom && pop3->custom[0] != '\0' ?
|
---|
619 | pop3->custom : command));
|
---|
620 |
|
---|
621 | if(!result)
|
---|
622 | state(conn, POP3_COMMAND);
|
---|
623 |
|
---|
624 | return result;
|
---|
625 | }
|
---|
626 |
|
---|
627 | /***********************************************************************
|
---|
628 | *
|
---|
629 | * pop3_perform_quit()
|
---|
630 | *
|
---|
631 | * Performs the quit action prior to sclose() be called.
|
---|
632 | */
|
---|
633 | static CURLcode pop3_perform_quit(struct connectdata *conn)
|
---|
634 | {
|
---|
635 | CURLcode result = CURLE_OK;
|
---|
636 |
|
---|
637 | /* Send the QUIT command */
|
---|
638 | result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", "QUIT");
|
---|
639 |
|
---|
640 | if(!result)
|
---|
641 | state(conn, POP3_QUIT);
|
---|
642 |
|
---|
643 | return result;
|
---|
644 | }
|
---|
645 |
|
---|
646 | /* For the initial server greeting */
|
---|
647 | static CURLcode pop3_state_servergreet_resp(struct connectdata *conn,
|
---|
648 | int pop3code,
|
---|
649 | pop3state instate)
|
---|
650 | {
|
---|
651 | CURLcode result = CURLE_OK;
|
---|
652 | struct SessionHandle *data = conn->data;
|
---|
653 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
654 | const char *line = data->state.buffer;
|
---|
655 | size_t len = strlen(line);
|
---|
656 | size_t i;
|
---|
657 |
|
---|
658 | (void)instate; /* no use for this yet */
|
---|
659 |
|
---|
660 | if(pop3code != '+') {
|
---|
661 | failf(data, "Got unexpected pop3-server response");
|
---|
662 | result = CURLE_FTP_WEIRD_SERVER_REPLY;
|
---|
663 | }
|
---|
664 | else {
|
---|
665 | /* Does the server support APOP authentication? */
|
---|
666 | if(len >= 4 && line[len - 2] == '>') {
|
---|
667 | /* Look for the APOP timestamp */
|
---|
668 | for(i = 3; i < len - 2; ++i) {
|
---|
669 | if(line[i] == '<') {
|
---|
670 | /* Calculate the length of the timestamp */
|
---|
671 | size_t timestamplen = len - 1 - i;
|
---|
672 | if(!timestamplen)
|
---|
673 | break;
|
---|
674 |
|
---|
675 | /* Allocate some memory for the timestamp */
|
---|
676 | pop3c->apoptimestamp = (char *)calloc(1, timestamplen + 1);
|
---|
677 |
|
---|
678 | if(!pop3c->apoptimestamp)
|
---|
679 | break;
|
---|
680 |
|
---|
681 | /* Copy the timestamp */
|
---|
682 | memcpy(pop3c->apoptimestamp, line + i, timestamplen);
|
---|
683 | pop3c->apoptimestamp[timestamplen] = '\0';
|
---|
684 |
|
---|
685 | /* Store the APOP capability */
|
---|
686 | pop3c->authtypes |= POP3_TYPE_APOP;
|
---|
687 | break;
|
---|
688 | }
|
---|
689 | }
|
---|
690 | }
|
---|
691 |
|
---|
692 | result = pop3_perform_capa(conn);
|
---|
693 | }
|
---|
694 |
|
---|
695 | return result;
|
---|
696 | }
|
---|
697 |
|
---|
698 | /* For CAPA responses */
|
---|
699 | static CURLcode pop3_state_capa_resp(struct connectdata *conn, int pop3code,
|
---|
700 | pop3state instate)
|
---|
701 | {
|
---|
702 | CURLcode result = CURLE_OK;
|
---|
703 | struct SessionHandle *data = conn->data;
|
---|
704 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
705 | const char *line = data->state.buffer;
|
---|
706 | size_t len = strlen(line);
|
---|
707 | size_t wordlen;
|
---|
708 |
|
---|
709 | (void)instate; /* no use for this yet */
|
---|
710 |
|
---|
711 | /* Do we have a untagged continuation response? */
|
---|
712 | if(pop3code == '*') {
|
---|
713 | /* Does the server support the STLS capability? */
|
---|
714 | if(len >= 4 && !memcmp(line, "STLS", 4))
|
---|
715 | pop3c->tls_supported = TRUE;
|
---|
716 |
|
---|
717 | /* Does the server support clear text authentication? */
|
---|
718 | else if(len >= 4 && !memcmp(line, "USER", 4))
|
---|
719 | pop3c->authtypes |= POP3_TYPE_CLEARTEXT;
|
---|
720 |
|
---|
721 | /* Does the server support SASL based authentication? */
|
---|
722 | else if(len >= 5 && !memcmp(line, "SASL ", 5)) {
|
---|
723 | pop3c->authtypes |= POP3_TYPE_SASL;
|
---|
724 |
|
---|
725 | /* Advance past the SASL keyword */
|
---|
726 | line += 5;
|
---|
727 | len -= 5;
|
---|
728 |
|
---|
729 | /* Loop through the data line */
|
---|
730 | for(;;) {
|
---|
731 | size_t llen;
|
---|
732 | unsigned int mechbit;
|
---|
733 |
|
---|
734 | while(len &&
|
---|
735 | (*line == ' ' || *line == '\t' ||
|
---|
736 | *line == '\r' || *line == '\n')) {
|
---|
737 |
|
---|
738 | line++;
|
---|
739 | len--;
|
---|
740 | }
|
---|
741 |
|
---|
742 | if(!len)
|
---|
743 | break;
|
---|
744 |
|
---|
745 | /* Extract the word */
|
---|
746 | for(wordlen = 0; wordlen < len && line[wordlen] != ' ' &&
|
---|
747 | line[wordlen] != '\t' && line[wordlen] != '\r' &&
|
---|
748 | line[wordlen] != '\n';)
|
---|
749 | wordlen++;
|
---|
750 |
|
---|
751 | /* Test the word for a matching authentication mechanism */
|
---|
752 | if((mechbit = Curl_sasl_decode_mech(line, wordlen, &llen)) &&
|
---|
753 | llen == wordlen)
|
---|
754 | pop3c->sasl.authmechs |= mechbit;
|
---|
755 |
|
---|
756 | line += wordlen;
|
---|
757 | len -= wordlen;
|
---|
758 | }
|
---|
759 | }
|
---|
760 | }
|
---|
761 | else if(pop3code == '+') {
|
---|
762 | if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) {
|
---|
763 | /* We don't have a SSL/TLS connection yet, but SSL is requested */
|
---|
764 | if(pop3c->tls_supported)
|
---|
765 | /* Switch to TLS connection now */
|
---|
766 | result = pop3_perform_starttls(conn);
|
---|
767 | else if(data->set.use_ssl == CURLUSESSL_TRY)
|
---|
768 | /* Fallback and carry on with authentication */
|
---|
769 | result = pop3_perform_authentication(conn);
|
---|
770 | else {
|
---|
771 | failf(data, "STLS not supported.");
|
---|
772 | result = CURLE_USE_SSL_FAILED;
|
---|
773 | }
|
---|
774 | }
|
---|
775 | else
|
---|
776 | result = pop3_perform_authentication(conn);
|
---|
777 | }
|
---|
778 | else {
|
---|
779 | /* Clear text is supported when CAPA isn't recognised */
|
---|
780 | pop3c->authtypes |= POP3_TYPE_CLEARTEXT;
|
---|
781 |
|
---|
782 | result = pop3_perform_authentication(conn);
|
---|
783 | }
|
---|
784 |
|
---|
785 | return result;
|
---|
786 | }
|
---|
787 |
|
---|
788 | /* For STARTTLS responses */
|
---|
789 | static CURLcode pop3_state_starttls_resp(struct connectdata *conn,
|
---|
790 | int pop3code,
|
---|
791 | pop3state instate)
|
---|
792 | {
|
---|
793 | CURLcode result = CURLE_OK;
|
---|
794 | struct SessionHandle *data = conn->data;
|
---|
795 |
|
---|
796 | (void)instate; /* no use for this yet */
|
---|
797 |
|
---|
798 | if(pop3code != '+') {
|
---|
799 | if(data->set.use_ssl != CURLUSESSL_TRY) {
|
---|
800 | failf(data, "STARTTLS denied. %c", pop3code);
|
---|
801 | result = CURLE_USE_SSL_FAILED;
|
---|
802 | }
|
---|
803 | else
|
---|
804 | result = pop3_perform_authentication(conn);
|
---|
805 | }
|
---|
806 | else
|
---|
807 | result = pop3_perform_upgrade_tls(conn);
|
---|
808 |
|
---|
809 | return result;
|
---|
810 | }
|
---|
811 |
|
---|
812 | /* For SASL authentication responses */
|
---|
813 | static CURLcode pop3_state_auth_resp(struct connectdata *conn,
|
---|
814 | int pop3code,
|
---|
815 | pop3state instate)
|
---|
816 | {
|
---|
817 | CURLcode result = CURLE_OK;
|
---|
818 | struct SessionHandle *data = conn->data;
|
---|
819 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
820 | saslprogress progress;
|
---|
821 |
|
---|
822 | (void)instate; /* no use for this yet */
|
---|
823 |
|
---|
824 | result = Curl_sasl_continue(&pop3c->sasl, conn, pop3code, &progress);
|
---|
825 | if(!result)
|
---|
826 | switch(progress) {
|
---|
827 | case SASL_DONE:
|
---|
828 | state(conn, POP3_STOP); /* Authenticated */
|
---|
829 | break;
|
---|
830 | case SASL_IDLE: /* No mechanism left after cancellation */
|
---|
831 | #ifndef CURL_DISABLE_CRYPTO_AUTH
|
---|
832 | if(pop3c->authtypes & pop3c->preftype & POP3_TYPE_APOP)
|
---|
833 | /* Perform APOP authentication */
|
---|
834 | result = pop3_perform_apop(conn);
|
---|
835 | else
|
---|
836 | #endif
|
---|
837 | if(pop3c->authtypes & pop3c->preftype & POP3_TYPE_CLEARTEXT)
|
---|
838 | /* Perform clear text authentication */
|
---|
839 | result = pop3_perform_user(conn);
|
---|
840 | else {
|
---|
841 | failf(data, "Authentication cancelled");
|
---|
842 | result = CURLE_LOGIN_DENIED;
|
---|
843 | }
|
---|
844 | break;
|
---|
845 | default:
|
---|
846 | break;
|
---|
847 | }
|
---|
848 |
|
---|
849 | return result;
|
---|
850 | }
|
---|
851 |
|
---|
852 | #ifndef CURL_DISABLE_CRYPTO_AUTH
|
---|
853 | /* For APOP responses */
|
---|
854 | static CURLcode pop3_state_apop_resp(struct connectdata *conn, int pop3code,
|
---|
855 | pop3state instate)
|
---|
856 | {
|
---|
857 | CURLcode result = CURLE_OK;
|
---|
858 | struct SessionHandle *data = conn->data;
|
---|
859 |
|
---|
860 | (void)instate; /* no use for this yet */
|
---|
861 |
|
---|
862 | if(pop3code != '+') {
|
---|
863 | failf(data, "Authentication failed: %d", pop3code);
|
---|
864 | result = CURLE_LOGIN_DENIED;
|
---|
865 | }
|
---|
866 | else
|
---|
867 | /* End of connect phase */
|
---|
868 | state(conn, POP3_STOP);
|
---|
869 |
|
---|
870 | return result;
|
---|
871 | }
|
---|
872 | #endif
|
---|
873 |
|
---|
874 | /* For USER responses */
|
---|
875 | static CURLcode pop3_state_user_resp(struct connectdata *conn, int pop3code,
|
---|
876 | pop3state instate)
|
---|
877 | {
|
---|
878 | CURLcode result = CURLE_OK;
|
---|
879 | struct SessionHandle *data = conn->data;
|
---|
880 |
|
---|
881 | (void)instate; /* no use for this yet */
|
---|
882 |
|
---|
883 | if(pop3code != '+') {
|
---|
884 | failf(data, "Access denied. %c", pop3code);
|
---|
885 | result = CURLE_LOGIN_DENIED;
|
---|
886 | }
|
---|
887 | else
|
---|
888 | /* Send the PASS command */
|
---|
889 | result = Curl_pp_sendf(&conn->proto.pop3c.pp, "PASS %s",
|
---|
890 | conn->passwd ? conn->passwd : "");
|
---|
891 | if(!result)
|
---|
892 | state(conn, POP3_PASS);
|
---|
893 |
|
---|
894 | return result;
|
---|
895 | }
|
---|
896 |
|
---|
897 | /* For PASS responses */
|
---|
898 | static CURLcode pop3_state_pass_resp(struct connectdata *conn, int pop3code,
|
---|
899 | pop3state instate)
|
---|
900 | {
|
---|
901 | CURLcode result = CURLE_OK;
|
---|
902 | struct SessionHandle *data = conn->data;
|
---|
903 |
|
---|
904 | (void)instate; /* no use for this yet */
|
---|
905 |
|
---|
906 | if(pop3code != '+') {
|
---|
907 | failf(data, "Access denied. %c", pop3code);
|
---|
908 | result = CURLE_LOGIN_DENIED;
|
---|
909 | }
|
---|
910 | else
|
---|
911 | /* End of connect phase */
|
---|
912 | state(conn, POP3_STOP);
|
---|
913 |
|
---|
914 | return result;
|
---|
915 | }
|
---|
916 |
|
---|
917 | /* For command responses */
|
---|
918 | static CURLcode pop3_state_command_resp(struct connectdata *conn,
|
---|
919 | int pop3code,
|
---|
920 | pop3state instate)
|
---|
921 | {
|
---|
922 | CURLcode result = CURLE_OK;
|
---|
923 | struct SessionHandle *data = conn->data;
|
---|
924 | struct POP3 *pop3 = data->req.protop;
|
---|
925 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
926 | struct pingpong *pp = &pop3c->pp;
|
---|
927 |
|
---|
928 | (void)instate; /* no use for this yet */
|
---|
929 |
|
---|
930 | if(pop3code != '+') {
|
---|
931 | state(conn, POP3_STOP);
|
---|
932 | return CURLE_RECV_ERROR;
|
---|
933 | }
|
---|
934 |
|
---|
935 | /* This 'OK' line ends with a CR LF pair which is the two first bytes of the
|
---|
936 | EOB string so count this is two matching bytes. This is necessary to make
|
---|
937 | the code detect the EOB if the only data than comes now is %2e CR LF like
|
---|
938 | when there is no body to return. */
|
---|
939 | pop3c->eob = 2;
|
---|
940 |
|
---|
941 | /* But since this initial CR LF pair is not part of the actual body, we set
|
---|
942 | the strip counter here so that these bytes won't be delivered. */
|
---|
943 | pop3c->strip = 2;
|
---|
944 |
|
---|
945 | if(pop3->transfer == FTPTRANSFER_BODY) {
|
---|
946 | /* POP3 download */
|
---|
947 | Curl_setup_transfer(conn, FIRSTSOCKET, -1, FALSE, NULL, -1, NULL);
|
---|
948 |
|
---|
949 | if(pp->cache) {
|
---|
950 | /* The header "cache" contains a bunch of data that is actually body
|
---|
951 | content so send it as such. Note that there may even be additional
|
---|
952 | "headers" after the body */
|
---|
953 |
|
---|
954 | if(!data->set.opt_no_body) {
|
---|
955 | result = Curl_pop3_write(conn, pp->cache, pp->cache_size);
|
---|
956 | if(result)
|
---|
957 | return result;
|
---|
958 | }
|
---|
959 |
|
---|
960 | /* Free the cache */
|
---|
961 | Curl_safefree(pp->cache);
|
---|
962 |
|
---|
963 | /* Reset the cache size */
|
---|
964 | pp->cache_size = 0;
|
---|
965 | }
|
---|
966 | }
|
---|
967 |
|
---|
968 | /* End of DO phase */
|
---|
969 | state(conn, POP3_STOP);
|
---|
970 |
|
---|
971 | return result;
|
---|
972 | }
|
---|
973 |
|
---|
974 | static CURLcode pop3_statemach_act(struct connectdata *conn)
|
---|
975 | {
|
---|
976 | CURLcode result = CURLE_OK;
|
---|
977 | curl_socket_t sock = conn->sock[FIRSTSOCKET];
|
---|
978 | int pop3code;
|
---|
979 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
980 | struct pingpong *pp = &pop3c->pp;
|
---|
981 | size_t nread = 0;
|
---|
982 |
|
---|
983 | /* Busy upgrading the connection; right now all I/O is SSL/TLS, not POP3 */
|
---|
984 | if(pop3c->state == POP3_UPGRADETLS)
|
---|
985 | return pop3_perform_upgrade_tls(conn);
|
---|
986 |
|
---|
987 | /* Flush any data that needs to be sent */
|
---|
988 | if(pp->sendleft)
|
---|
989 | return Curl_pp_flushsend(pp);
|
---|
990 |
|
---|
991 | do {
|
---|
992 | /* Read the response from the server */
|
---|
993 | result = Curl_pp_readresp(sock, pp, &pop3code, &nread);
|
---|
994 | if(result)
|
---|
995 | return result;
|
---|
996 |
|
---|
997 | if(!pop3code)
|
---|
998 | break;
|
---|
999 |
|
---|
1000 | /* We have now received a full POP3 server response */
|
---|
1001 | switch(pop3c->state) {
|
---|
1002 | case POP3_SERVERGREET:
|
---|
1003 | result = pop3_state_servergreet_resp(conn, pop3code, pop3c->state);
|
---|
1004 | break;
|
---|
1005 |
|
---|
1006 | case POP3_CAPA:
|
---|
1007 | result = pop3_state_capa_resp(conn, pop3code, pop3c->state);
|
---|
1008 | break;
|
---|
1009 |
|
---|
1010 | case POP3_STARTTLS:
|
---|
1011 | result = pop3_state_starttls_resp(conn, pop3code, pop3c->state);
|
---|
1012 | break;
|
---|
1013 |
|
---|
1014 | case POP3_AUTH:
|
---|
1015 | result = pop3_state_auth_resp(conn, pop3code, pop3c->state);
|
---|
1016 | break;
|
---|
1017 |
|
---|
1018 | #ifndef CURL_DISABLE_CRYPTO_AUTH
|
---|
1019 | case POP3_APOP:
|
---|
1020 | result = pop3_state_apop_resp(conn, pop3code, pop3c->state);
|
---|
1021 | break;
|
---|
1022 | #endif
|
---|
1023 |
|
---|
1024 | case POP3_USER:
|
---|
1025 | result = pop3_state_user_resp(conn, pop3code, pop3c->state);
|
---|
1026 | break;
|
---|
1027 |
|
---|
1028 | case POP3_PASS:
|
---|
1029 | result = pop3_state_pass_resp(conn, pop3code, pop3c->state);
|
---|
1030 | break;
|
---|
1031 |
|
---|
1032 | case POP3_COMMAND:
|
---|
1033 | result = pop3_state_command_resp(conn, pop3code, pop3c->state);
|
---|
1034 | break;
|
---|
1035 |
|
---|
1036 | case POP3_QUIT:
|
---|
1037 | /* fallthrough, just stop! */
|
---|
1038 | default:
|
---|
1039 | /* internal error */
|
---|
1040 | state(conn, POP3_STOP);
|
---|
1041 | break;
|
---|
1042 | }
|
---|
1043 | } while(!result && pop3c->state != POP3_STOP && Curl_pp_moredata(pp));
|
---|
1044 |
|
---|
1045 | return result;
|
---|
1046 | }
|
---|
1047 |
|
---|
1048 | /* Called repeatedly until done from multi.c */
|
---|
1049 | static CURLcode pop3_multi_statemach(struct connectdata *conn, bool *done)
|
---|
1050 | {
|
---|
1051 | CURLcode result = CURLE_OK;
|
---|
1052 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
1053 |
|
---|
1054 | if((conn->handler->flags & PROTOPT_SSL) && !pop3c->ssldone) {
|
---|
1055 | result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &pop3c->ssldone);
|
---|
1056 | if(result || !pop3c->ssldone)
|
---|
1057 | return result;
|
---|
1058 | }
|
---|
1059 |
|
---|
1060 | result = Curl_pp_statemach(&pop3c->pp, FALSE);
|
---|
1061 | *done = (pop3c->state == POP3_STOP) ? TRUE : FALSE;
|
---|
1062 |
|
---|
1063 | return result;
|
---|
1064 | }
|
---|
1065 |
|
---|
1066 | static CURLcode pop3_block_statemach(struct connectdata *conn)
|
---|
1067 | {
|
---|
1068 | CURLcode result = CURLE_OK;
|
---|
1069 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
1070 |
|
---|
1071 | while(pop3c->state != POP3_STOP && !result)
|
---|
1072 | result = Curl_pp_statemach(&pop3c->pp, TRUE);
|
---|
1073 |
|
---|
1074 | return result;
|
---|
1075 | }
|
---|
1076 |
|
---|
1077 | /* Allocate and initialize the POP3 struct for the current SessionHandle if
|
---|
1078 | required */
|
---|
1079 | static CURLcode pop3_init(struct connectdata *conn)
|
---|
1080 | {
|
---|
1081 | CURLcode result = CURLE_OK;
|
---|
1082 | struct SessionHandle *data = conn->data;
|
---|
1083 | struct POP3 *pop3;
|
---|
1084 |
|
---|
1085 | pop3 = data->req.protop = calloc(sizeof(struct POP3), 1);
|
---|
1086 | if(!pop3)
|
---|
1087 | result = CURLE_OUT_OF_MEMORY;
|
---|
1088 |
|
---|
1089 | return result;
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | /* For the POP3 "protocol connect" and "doing" phases only */
|
---|
1093 | static int pop3_getsock(struct connectdata *conn, curl_socket_t *socks,
|
---|
1094 | int numsocks)
|
---|
1095 | {
|
---|
1096 | return Curl_pp_getsock(&conn->proto.pop3c.pp, socks, numsocks);
|
---|
1097 | }
|
---|
1098 |
|
---|
1099 | /***********************************************************************
|
---|
1100 | *
|
---|
1101 | * pop3_connect()
|
---|
1102 | *
|
---|
1103 | * This function should do everything that is to be considered a part of the
|
---|
1104 | * connection phase.
|
---|
1105 | *
|
---|
1106 | * The variable 'done' points to will be TRUE if the protocol-layer connect
|
---|
1107 | * phase is done when this function returns, or FALSE if not.
|
---|
1108 | */
|
---|
1109 | static CURLcode pop3_connect(struct connectdata *conn, bool *done)
|
---|
1110 | {
|
---|
1111 | CURLcode result = CURLE_OK;
|
---|
1112 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
1113 | struct pingpong *pp = &pop3c->pp;
|
---|
1114 |
|
---|
1115 | *done = FALSE; /* default to not done yet */
|
---|
1116 |
|
---|
1117 | /* We always support persistent connections in POP3 */
|
---|
1118 | connkeep(conn, "POP3 default");
|
---|
1119 |
|
---|
1120 | /* Set the default response time-out */
|
---|
1121 | pp->response_time = RESP_TIMEOUT;
|
---|
1122 | pp->statemach_act = pop3_statemach_act;
|
---|
1123 | pp->endofresp = pop3_endofresp;
|
---|
1124 | pp->conn = conn;
|
---|
1125 |
|
---|
1126 | /* Set the default preferred authentication type and mechanism */
|
---|
1127 | pop3c->preftype = POP3_TYPE_ANY;
|
---|
1128 | Curl_sasl_init(&pop3c->sasl, &saslpop3);
|
---|
1129 |
|
---|
1130 | /* Initialise the pingpong layer */
|
---|
1131 | Curl_pp_init(pp);
|
---|
1132 |
|
---|
1133 | /* Parse the URL options */
|
---|
1134 | result = pop3_parse_url_options(conn);
|
---|
1135 | if(result)
|
---|
1136 | return result;
|
---|
1137 |
|
---|
1138 | /* Start off waiting for the server greeting response */
|
---|
1139 | state(conn, POP3_SERVERGREET);
|
---|
1140 |
|
---|
1141 | result = pop3_multi_statemach(conn, done);
|
---|
1142 |
|
---|
1143 | return result;
|
---|
1144 | }
|
---|
1145 |
|
---|
1146 | /***********************************************************************
|
---|
1147 | *
|
---|
1148 | * pop3_done()
|
---|
1149 | *
|
---|
1150 | * The DONE function. This does what needs to be done after a single DO has
|
---|
1151 | * performed.
|
---|
1152 | *
|
---|
1153 | * Input argument is already checked for validity.
|
---|
1154 | */
|
---|
1155 | static CURLcode pop3_done(struct connectdata *conn, CURLcode status,
|
---|
1156 | bool premature)
|
---|
1157 | {
|
---|
1158 | CURLcode result = CURLE_OK;
|
---|
1159 | struct SessionHandle *data = conn->data;
|
---|
1160 | struct POP3 *pop3 = data->req.protop;
|
---|
1161 |
|
---|
1162 | (void)premature;
|
---|
1163 |
|
---|
1164 | if(!pop3)
|
---|
1165 | /* When the easy handle is removed from the multi interface while libcurl
|
---|
1166 | is still trying to resolve the host name, the POP3 struct is not yet
|
---|
1167 | initialized. However, the removal action calls Curl_done() which in
|
---|
1168 | turn calls this function, so we simply return success. */
|
---|
1169 | return CURLE_OK;
|
---|
1170 |
|
---|
1171 | if(status) {
|
---|
1172 | connclose(conn, "POP3 done with bad status");
|
---|
1173 | result = status; /* use the already set error code */
|
---|
1174 | }
|
---|
1175 |
|
---|
1176 | /* Cleanup our per-request based variables */
|
---|
1177 | Curl_safefree(pop3->id);
|
---|
1178 | Curl_safefree(pop3->custom);
|
---|
1179 |
|
---|
1180 | /* Clear the transfer mode for the next request */
|
---|
1181 | pop3->transfer = FTPTRANSFER_BODY;
|
---|
1182 |
|
---|
1183 | return result;
|
---|
1184 | }
|
---|
1185 |
|
---|
1186 | /***********************************************************************
|
---|
1187 | *
|
---|
1188 | * pop3_perform()
|
---|
1189 | *
|
---|
1190 | * This is the actual DO function for POP3. Get a message/listing according to
|
---|
1191 | * the options previously setup.
|
---|
1192 | */
|
---|
1193 | static CURLcode pop3_perform(struct connectdata *conn, bool *connected,
|
---|
1194 | bool *dophase_done)
|
---|
1195 | {
|
---|
1196 | /* This is POP3 and no proxy */
|
---|
1197 | CURLcode result = CURLE_OK;
|
---|
1198 | struct POP3 *pop3 = conn->data->req.protop;
|
---|
1199 |
|
---|
1200 | DEBUGF(infof(conn->data, "DO phase starts\n"));
|
---|
1201 |
|
---|
1202 | if(conn->data->set.opt_no_body) {
|
---|
1203 | /* Requested no body means no transfer */
|
---|
1204 | pop3->transfer = FTPTRANSFER_INFO;
|
---|
1205 | }
|
---|
1206 |
|
---|
1207 | *dophase_done = FALSE; /* not done yet */
|
---|
1208 |
|
---|
1209 | /* Start the first command in the DO phase */
|
---|
1210 | result = pop3_perform_command(conn);
|
---|
1211 | if(result)
|
---|
1212 | return result;
|
---|
1213 |
|
---|
1214 | /* Run the state-machine */
|
---|
1215 | result = pop3_multi_statemach(conn, dophase_done);
|
---|
1216 |
|
---|
1217 | *connected = conn->bits.tcpconnect[FIRSTSOCKET];
|
---|
1218 |
|
---|
1219 | if(*dophase_done)
|
---|
1220 | DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
---|
1221 |
|
---|
1222 | return result;
|
---|
1223 | }
|
---|
1224 |
|
---|
1225 | /***********************************************************************
|
---|
1226 | *
|
---|
1227 | * pop3_do()
|
---|
1228 | *
|
---|
1229 | * This function is registered as 'curl_do' function. It decodes the path
|
---|
1230 | * parts etc as a wrapper to the actual DO function (pop3_perform).
|
---|
1231 | *
|
---|
1232 | * The input argument is already checked for validity.
|
---|
1233 | */
|
---|
1234 | static CURLcode pop3_do(struct connectdata *conn, bool *done)
|
---|
1235 | {
|
---|
1236 | CURLcode result = CURLE_OK;
|
---|
1237 |
|
---|
1238 | *done = FALSE; /* default to false */
|
---|
1239 |
|
---|
1240 | /* Parse the URL path */
|
---|
1241 | result = pop3_parse_url_path(conn);
|
---|
1242 | if(result)
|
---|
1243 | return result;
|
---|
1244 |
|
---|
1245 | /* Parse the custom request */
|
---|
1246 | result = pop3_parse_custom_request(conn);
|
---|
1247 | if(result)
|
---|
1248 | return result;
|
---|
1249 |
|
---|
1250 | result = pop3_regular_transfer(conn, done);
|
---|
1251 |
|
---|
1252 | return result;
|
---|
1253 | }
|
---|
1254 |
|
---|
1255 | /***********************************************************************
|
---|
1256 | *
|
---|
1257 | * pop3_disconnect()
|
---|
1258 | *
|
---|
1259 | * Disconnect from an POP3 server. Cleanup protocol-specific per-connection
|
---|
1260 | * resources. BLOCKING.
|
---|
1261 | */
|
---|
1262 | static CURLcode pop3_disconnect(struct connectdata *conn, bool dead_connection)
|
---|
1263 | {
|
---|
1264 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
1265 |
|
---|
1266 | /* We cannot send quit unconditionally. If this connection is stale or
|
---|
1267 | bad in any way, sending quit and waiting around here will make the
|
---|
1268 | disconnect wait in vain and cause more problems than we need to. */
|
---|
1269 |
|
---|
1270 | /* The POP3 session may or may not have been allocated/setup at this
|
---|
1271 | point! */
|
---|
1272 | if(!dead_connection && pop3c->pp.conn && pop3c->pp.conn->bits.protoconnstart)
|
---|
1273 | if(!pop3_perform_quit(conn))
|
---|
1274 | (void)pop3_block_statemach(conn); /* ignore errors on QUIT */
|
---|
1275 |
|
---|
1276 | /* Disconnect from the server */
|
---|
1277 | Curl_pp_disconnect(&pop3c->pp);
|
---|
1278 |
|
---|
1279 | /* Cleanup the SASL module */
|
---|
1280 | Curl_sasl_cleanup(conn, pop3c->sasl.authused);
|
---|
1281 |
|
---|
1282 | /* Cleanup our connection based variables */
|
---|
1283 | Curl_safefree(pop3c->apoptimestamp);
|
---|
1284 |
|
---|
1285 | return CURLE_OK;
|
---|
1286 | }
|
---|
1287 |
|
---|
1288 | /* Call this when the DO phase has completed */
|
---|
1289 | static CURLcode pop3_dophase_done(struct connectdata *conn, bool connected)
|
---|
1290 | {
|
---|
1291 | (void)conn;
|
---|
1292 | (void)connected;
|
---|
1293 |
|
---|
1294 | return CURLE_OK;
|
---|
1295 | }
|
---|
1296 |
|
---|
1297 | /* Called from multi.c while DOing */
|
---|
1298 | static CURLcode pop3_doing(struct connectdata *conn, bool *dophase_done)
|
---|
1299 | {
|
---|
1300 | CURLcode result = pop3_multi_statemach(conn, dophase_done);
|
---|
1301 |
|
---|
1302 | if(result)
|
---|
1303 | DEBUGF(infof(conn->data, "DO phase failed\n"));
|
---|
1304 | else if(*dophase_done) {
|
---|
1305 | result = pop3_dophase_done(conn, FALSE /* not connected */);
|
---|
1306 |
|
---|
1307 | DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
---|
1308 | }
|
---|
1309 |
|
---|
1310 | return result;
|
---|
1311 | }
|
---|
1312 |
|
---|
1313 | /***********************************************************************
|
---|
1314 | *
|
---|
1315 | * pop3_regular_transfer()
|
---|
1316 | *
|
---|
1317 | * The input argument is already checked for validity.
|
---|
1318 | *
|
---|
1319 | * Performs all commands done before a regular transfer between a local and a
|
---|
1320 | * remote host.
|
---|
1321 | */
|
---|
1322 | static CURLcode pop3_regular_transfer(struct connectdata *conn,
|
---|
1323 | bool *dophase_done)
|
---|
1324 | {
|
---|
1325 | CURLcode result = CURLE_OK;
|
---|
1326 | bool connected = FALSE;
|
---|
1327 | struct SessionHandle *data = conn->data;
|
---|
1328 |
|
---|
1329 | /* Make sure size is unknown at this point */
|
---|
1330 | data->req.size = -1;
|
---|
1331 |
|
---|
1332 | /* Set the progress data */
|
---|
1333 | Curl_pgrsSetUploadCounter(data, 0);
|
---|
1334 | Curl_pgrsSetDownloadCounter(data, 0);
|
---|
1335 | Curl_pgrsSetUploadSize(data, -1);
|
---|
1336 | Curl_pgrsSetDownloadSize(data, -1);
|
---|
1337 |
|
---|
1338 | /* Carry out the perform */
|
---|
1339 | result = pop3_perform(conn, &connected, dophase_done);
|
---|
1340 |
|
---|
1341 | /* Perform post DO phase operations if necessary */
|
---|
1342 | if(!result && *dophase_done)
|
---|
1343 | result = pop3_dophase_done(conn, connected);
|
---|
1344 |
|
---|
1345 | return result;
|
---|
1346 | }
|
---|
1347 |
|
---|
1348 | static CURLcode pop3_setup_connection(struct connectdata *conn)
|
---|
1349 | {
|
---|
1350 | struct SessionHandle *data = conn->data;
|
---|
1351 |
|
---|
1352 | /* Initialise the POP3 layer */
|
---|
1353 | CURLcode result = pop3_init(conn);
|
---|
1354 | if(result)
|
---|
1355 | return result;
|
---|
1356 |
|
---|
1357 | if(conn->bits.httpproxy && !data->set.tunnel_thru_httpproxy) {
|
---|
1358 | /* Unless we have asked to tunnel POP3 operations through the proxy, we
|
---|
1359 | switch and use HTTP operations only */
|
---|
1360 | #ifndef CURL_DISABLE_HTTP
|
---|
1361 | if(conn->handler == &Curl_handler_pop3)
|
---|
1362 | conn->handler = &Curl_handler_pop3_proxy;
|
---|
1363 | else {
|
---|
1364 | #ifdef USE_SSL
|
---|
1365 | conn->handler = &Curl_handler_pop3s_proxy;
|
---|
1366 | #else
|
---|
1367 | failf(data, "POP3S not supported!");
|
---|
1368 | return CURLE_UNSUPPORTED_PROTOCOL;
|
---|
1369 | #endif
|
---|
1370 | }
|
---|
1371 |
|
---|
1372 | /* set it up as an HTTP connection instead */
|
---|
1373 | return conn->handler->setup_connection(conn);
|
---|
1374 | #else
|
---|
1375 | failf(data, "POP3 over http proxy requires HTTP support built-in!");
|
---|
1376 | return CURLE_UNSUPPORTED_PROTOCOL;
|
---|
1377 | #endif
|
---|
1378 | }
|
---|
1379 |
|
---|
1380 | data->state.path++; /* don't include the initial slash */
|
---|
1381 |
|
---|
1382 | return CURLE_OK;
|
---|
1383 | }
|
---|
1384 |
|
---|
1385 | /***********************************************************************
|
---|
1386 | *
|
---|
1387 | * pop3_parse_url_options()
|
---|
1388 | *
|
---|
1389 | * Parse the URL login options.
|
---|
1390 | */
|
---|
1391 | static CURLcode pop3_parse_url_options(struct connectdata *conn)
|
---|
1392 | {
|
---|
1393 | CURLcode result = CURLE_OK;
|
---|
1394 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
1395 | const char *ptr = conn->options;
|
---|
1396 |
|
---|
1397 | pop3c->sasl.resetprefs = TRUE;
|
---|
1398 |
|
---|
1399 | while(!result && ptr && *ptr) {
|
---|
1400 | const char *key = ptr;
|
---|
1401 | const char *value;
|
---|
1402 |
|
---|
1403 | while(*ptr && *ptr != '=')
|
---|
1404 | ptr++;
|
---|
1405 |
|
---|
1406 | value = ptr + 1;
|
---|
1407 |
|
---|
1408 | while(*ptr && *ptr != ';')
|
---|
1409 | ptr++;
|
---|
1410 |
|
---|
1411 | if(strnequal(key, "AUTH=", 5)) {
|
---|
1412 | result = Curl_sasl_parse_url_auth_option(&pop3c->sasl,
|
---|
1413 | value, ptr - value);
|
---|
1414 |
|
---|
1415 | if(result && strnequal(value, "+APOP", ptr - value)) {
|
---|
1416 | pop3c->preftype = POP3_TYPE_APOP;
|
---|
1417 | pop3c->sasl.prefmech = SASL_AUTH_NONE;
|
---|
1418 | result = CURLE_OK;
|
---|
1419 | }
|
---|
1420 | }
|
---|
1421 | else
|
---|
1422 | result = CURLE_URL_MALFORMAT;
|
---|
1423 |
|
---|
1424 | if(*ptr == ';')
|
---|
1425 | ptr++;
|
---|
1426 | }
|
---|
1427 |
|
---|
1428 | if(pop3c->preftype != POP3_TYPE_APOP)
|
---|
1429 | switch(pop3c->sasl.prefmech) {
|
---|
1430 | case SASL_AUTH_NONE:
|
---|
1431 | pop3c->preftype = POP3_TYPE_NONE;
|
---|
1432 | break;
|
---|
1433 | case SASL_AUTH_DEFAULT:
|
---|
1434 | pop3c->preftype = POP3_TYPE_ANY;
|
---|
1435 | break;
|
---|
1436 | default:
|
---|
1437 | pop3c->preftype = POP3_TYPE_SASL;
|
---|
1438 | break;
|
---|
1439 | }
|
---|
1440 |
|
---|
1441 | return result;
|
---|
1442 | }
|
---|
1443 |
|
---|
1444 | /***********************************************************************
|
---|
1445 | *
|
---|
1446 | * pop3_parse_url_path()
|
---|
1447 | *
|
---|
1448 | * Parse the URL path into separate path components.
|
---|
1449 | */
|
---|
1450 | static CURLcode pop3_parse_url_path(struct connectdata *conn)
|
---|
1451 | {
|
---|
1452 | /* The POP3 struct is already initialised in pop3_connect() */
|
---|
1453 | struct SessionHandle *data = conn->data;
|
---|
1454 | struct POP3 *pop3 = data->req.protop;
|
---|
1455 | const char *path = data->state.path;
|
---|
1456 |
|
---|
1457 | /* URL decode the path for the message ID */
|
---|
1458 | return Curl_urldecode(data, path, 0, &pop3->id, NULL, TRUE);
|
---|
1459 | }
|
---|
1460 |
|
---|
1461 | /***********************************************************************
|
---|
1462 | *
|
---|
1463 | * pop3_parse_custom_request()
|
---|
1464 | *
|
---|
1465 | * Parse the custom request.
|
---|
1466 | */
|
---|
1467 | static CURLcode pop3_parse_custom_request(struct connectdata *conn)
|
---|
1468 | {
|
---|
1469 | CURLcode result = CURLE_OK;
|
---|
1470 | struct SessionHandle *data = conn->data;
|
---|
1471 | struct POP3 *pop3 = data->req.protop;
|
---|
1472 | const char *custom = data->set.str[STRING_CUSTOMREQUEST];
|
---|
1473 |
|
---|
1474 | /* URL decode the custom request */
|
---|
1475 | if(custom)
|
---|
1476 | result = Curl_urldecode(data, custom, 0, &pop3->custom, NULL, TRUE);
|
---|
1477 |
|
---|
1478 | return result;
|
---|
1479 | }
|
---|
1480 |
|
---|
1481 | /***********************************************************************
|
---|
1482 | *
|
---|
1483 | * Curl_pop3_write()
|
---|
1484 | *
|
---|
1485 | * This function scans the body after the end-of-body and writes everything
|
---|
1486 | * until the end is found.
|
---|
1487 | */
|
---|
1488 | CURLcode Curl_pop3_write(struct connectdata *conn, char *str, size_t nread)
|
---|
1489 | {
|
---|
1490 | /* This code could be made into a special function in the handler struct */
|
---|
1491 | CURLcode result = CURLE_OK;
|
---|
1492 | struct SessionHandle *data = conn->data;
|
---|
1493 | struct SingleRequest *k = &data->req;
|
---|
1494 |
|
---|
1495 | struct pop3_conn *pop3c = &conn->proto.pop3c;
|
---|
1496 | bool strip_dot = FALSE;
|
---|
1497 | size_t last = 0;
|
---|
1498 | size_t i;
|
---|
1499 |
|
---|
1500 | /* Search through the buffer looking for the end-of-body marker which is
|
---|
1501 | 5 bytes (0d 0a 2e 0d 0a). Note that a line starting with a dot matches
|
---|
1502 | the eob so the server will have prefixed it with an extra dot which we
|
---|
1503 | need to strip out. Additionally the marker could of course be spread out
|
---|
1504 | over 5 different data chunks. */
|
---|
1505 | for(i = 0; i < nread; i++) {
|
---|
1506 | size_t prev = pop3c->eob;
|
---|
1507 |
|
---|
1508 | switch(str[i]) {
|
---|
1509 | case 0x0d:
|
---|
1510 | if(pop3c->eob == 0) {
|
---|
1511 | pop3c->eob++;
|
---|
1512 |
|
---|
1513 | if(i) {
|
---|
1514 | /* Write out the body part that didn't match */
|
---|
1515 | result = Curl_client_write(conn, CLIENTWRITE_BODY, &str[last],
|
---|
1516 | i - last);
|
---|
1517 |
|
---|
1518 | if(result)
|
---|
1519 | return result;
|
---|
1520 |
|
---|
1521 | last = i;
|
---|
1522 | }
|
---|
1523 | }
|
---|
1524 | else if(pop3c->eob == 3)
|
---|
1525 | pop3c->eob++;
|
---|
1526 | else
|
---|
1527 | /* If the character match wasn't at position 0 or 3 then restart the
|
---|
1528 | pattern matching */
|
---|
1529 | pop3c->eob = 1;
|
---|
1530 | break;
|
---|
1531 |
|
---|
1532 | case 0x0a:
|
---|
1533 | if(pop3c->eob == 1 || pop3c->eob == 4)
|
---|
1534 | pop3c->eob++;
|
---|
1535 | else
|
---|
1536 | /* If the character match wasn't at position 1 or 4 then start the
|
---|
1537 | search again */
|
---|
1538 | pop3c->eob = 0;
|
---|
1539 | break;
|
---|
1540 |
|
---|
1541 | case 0x2e:
|
---|
1542 | if(pop3c->eob == 2)
|
---|
1543 | pop3c->eob++;
|
---|
1544 | else if(pop3c->eob == 3) {
|
---|
1545 | /* We have an extra dot after the CRLF which we need to strip off */
|
---|
1546 | strip_dot = TRUE;
|
---|
1547 | pop3c->eob = 0;
|
---|
1548 | }
|
---|
1549 | else
|
---|
1550 | /* If the character match wasn't at position 2 then start the search
|
---|
1551 | again */
|
---|
1552 | pop3c->eob = 0;
|
---|
1553 | break;
|
---|
1554 |
|
---|
1555 | default:
|
---|
1556 | pop3c->eob = 0;
|
---|
1557 | break;
|
---|
1558 | }
|
---|
1559 |
|
---|
1560 | /* Did we have a partial match which has subsequently failed? */
|
---|
1561 | if(prev && prev >= pop3c->eob) {
|
---|
1562 | /* Strip can only be non-zero for the very first mismatch after CRLF
|
---|
1563 | and then both prev and strip are equal and nothing will be output
|
---|
1564 | below */
|
---|
1565 | while(prev && pop3c->strip) {
|
---|
1566 | prev--;
|
---|
1567 | pop3c->strip--;
|
---|
1568 | }
|
---|
1569 |
|
---|
1570 | if(prev) {
|
---|
1571 | /* If the partial match was the CRLF and dot then only write the CRLF
|
---|
1572 | as the server would have inserted the dot */
|
---|
1573 | result = Curl_client_write(conn, CLIENTWRITE_BODY, (char*)POP3_EOB,
|
---|
1574 | strip_dot ? prev - 1 : prev);
|
---|
1575 |
|
---|
1576 | if(result)
|
---|
1577 | return result;
|
---|
1578 |
|
---|
1579 | last = i;
|
---|
1580 | strip_dot = FALSE;
|
---|
1581 | }
|
---|
1582 | }
|
---|
1583 | }
|
---|
1584 |
|
---|
1585 | if(pop3c->eob == POP3_EOB_LEN) {
|
---|
1586 | /* We have a full match so the transfer is done, however we must transfer
|
---|
1587 | the CRLF at the start of the EOB as this is considered to be part of the
|
---|
1588 | message as per RFC-1939, sect. 3 */
|
---|
1589 | result = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)POP3_EOB, 2);
|
---|
1590 |
|
---|
1591 | k->keepon &= ~KEEP_RECV;
|
---|
1592 | pop3c->eob = 0;
|
---|
1593 |
|
---|
1594 | return result;
|
---|
1595 | }
|
---|
1596 |
|
---|
1597 | if(pop3c->eob)
|
---|
1598 | /* While EOB is matching nothing should be output */
|
---|
1599 | return CURLE_OK;
|
---|
1600 |
|
---|
1601 | if(nread - last) {
|
---|
1602 | result = Curl_client_write(conn, CLIENTWRITE_BODY, &str[last],
|
---|
1603 | nread - last);
|
---|
1604 | }
|
---|
1605 |
|
---|
1606 | return result;
|
---|
1607 | }
|
---|
1608 |
|
---|
1609 | #endif /* CURL_DISABLE_POP3 */
|
---|