[388] | 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 <inttypes.h>
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| 9 |
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| 10 | int gethostbyaddr_r(const void *a, socklen_t l, int af,
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| 11 | struct hostent *h, char *buf, size_t buflen,
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| 12 | struct hostent **res, int *err)
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| 13 | {
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| 14 | union {
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| 15 | struct sockaddr_in sin;
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| 16 | struct sockaddr_in6 sin6;
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| 17 | } sa = { .sin.sin_family = af };
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| 18 | socklen_t sl = af==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin;
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| 19 | int i;
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| 20 |
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| 21 | *res = 0;
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| 22 |
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| 23 | /* Load address argument into sockaddr structure */
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| 24 | if (af==AF_INET6 && l==16) memcpy(&sa.sin6.sin6_addr, a, 16);
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| 25 | else if (af==AF_INET && l==4) memcpy(&sa.sin.sin_addr, a, 4);
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| 26 | else {
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| 27 | *err = NO_RECOVERY;
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| 28 | return EINVAL;
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| 29 | }
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| 30 |
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| 31 | /* Align buffer and check for space for pointers and ip address */
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| 32 | i = (uintptr_t)buf & sizeof(char *)-1;
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| 33 | if (!i) i = sizeof(char *);
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| 34 | if (buflen <= 5*sizeof(char *)-i + l) return ERANGE;
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| 35 | buf += sizeof(char *)-i;
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| 36 | buflen -= 5*sizeof(char *)-i + l;
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| 37 |
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| 38 | h->h_addr_list = (void *)buf;
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| 39 | buf += 2*sizeof(char *);
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| 40 | h->h_aliases = (void *)buf;
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| 41 | buf += 2*sizeof(char *);
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| 42 |
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| 43 | h->h_addr_list[0] = buf;
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| 44 | memcpy(h->h_addr_list[0], a, l);
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| 45 | buf += l;
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| 46 | h->h_addr_list[1] = 0;
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| 47 | h->h_aliases[0] = buf;
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| 48 | h->h_aliases[1] = 0;
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| 49 |
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| 50 | switch (getnameinfo((void *)&sa, sl, buf, buflen, 0, 0, 0)) {
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| 51 | case EAI_AGAIN:
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| 52 | *err = TRY_AGAIN;
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| 53 | return EAGAIN;
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| 54 | case EAI_OVERFLOW:
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| 55 | return ERANGE;
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| 56 | default:
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| 57 | case EAI_MEMORY:
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| 58 | case EAI_SYSTEM:
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| 59 | case EAI_FAIL:
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| 60 | *err = NO_RECOVERY;
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| 61 | return errno;
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| 62 | case 0:
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| 63 | break;
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| 64 | }
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| 65 |
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| 66 | h->h_addrtype = af;
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| 67 | h->h_length = l;
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| 68 | h->h_name = h->h_aliases[0];
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| 69 | *res = h;
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| 70 | return 0;
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| 71 | }
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