[444] | 1 | #define _GNU_SOURCE
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| 2 |
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| 3 | #include <sys/socket.h>
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| 4 | #include <netdb.h>
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| 5 | #include <string.h>
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| 6 | #include <netinet/in.h>
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| 7 | #include <errno.h>
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| 8 | #include <stdint.h>
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| 9 | #include "lookup.h"
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| 10 |
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| 11 | int gethostbyname2_r(const char *name, int af,
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| 12 | struct hostent *h, char *buf, size_t buflen,
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| 13 | struct hostent **res, int *err)
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| 14 | {
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| 15 | struct address addrs[MAXADDRS];
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| 16 | char canon[256];
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| 17 | int i, cnt;
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| 18 | size_t align, need;
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| 19 |
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| 20 | *res = 0;
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| 21 | cnt = __lookup_name(addrs, canon, name, af, AI_CANONNAME);
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| 22 | if (cnt<0) switch (cnt) {
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| 23 | case EAI_NONAME:
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| 24 | *err = HOST_NOT_FOUND;
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| 25 | return ENOENT;
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| 26 | case EAI_AGAIN:
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| 27 | *err = TRY_AGAIN;
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| 28 | return EAGAIN;
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| 29 | default:
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| 30 | case EAI_FAIL:
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| 31 | *err = NO_RECOVERY;
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| 32 | return EBADMSG;
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| 33 | case EAI_MEMORY:
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| 34 | case EAI_SYSTEM:
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| 35 | *err = NO_RECOVERY;
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| 36 | return errno;
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| 37 | }
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| 38 |
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| 39 | h->h_addrtype = af;
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| 40 | h->h_length = af==AF_INET6 ? 16 : 4;
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| 41 |
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| 42 | /* Align buffer */
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| 43 | align = -(uintptr_t)buf & sizeof(char *)-1;
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| 44 |
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| 45 | need = 4*sizeof(char *);
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| 46 | need += (cnt + 1) * (sizeof(char *) + h->h_length);
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| 47 | need += strlen(name)+1;
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| 48 | need += strlen(canon)+1;
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| 49 | need += align;
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| 50 |
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| 51 | if (need > buflen) return ERANGE;
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| 52 |
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| 53 | buf += align;
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| 54 | h->h_aliases = (void *)buf;
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| 55 | buf += 3*sizeof(char *);
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| 56 | h->h_addr_list = (void *)buf;
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| 57 | buf += (cnt+1)*sizeof(char *);
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| 58 |
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| 59 | for (i=0; i<cnt; i++) {
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| 60 | h->h_addr_list[i] = (void *)buf;
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| 61 | buf += h->h_length;
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| 62 | memcpy(h->h_addr_list[i], addrs[i].addr, h->h_length);
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| 63 | }
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| 64 | h->h_addr_list[i] = 0;
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| 65 |
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| 66 | h->h_name = h->h_aliases[0] = buf;
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| 67 | strcpy(h->h_name, canon);
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| 68 | buf += strlen(h->h_name)+1;
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| 69 |
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| 70 | if (strcmp(h->h_name, name)) {
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| 71 | h->h_aliases[1] = buf;
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| 72 | strcpy(h->h_aliases[1], name);
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| 73 | buf += strlen(h->h_aliases[1])+1;
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| 74 | } else h->h_aliases[1] = 0;
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| 75 |
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| 76 | h->h_aliases[2] = 0;
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| 77 |
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| 78 | *res = h;
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| 79 | return 0;
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| 80 | }
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