mirror of
git://git.musl-libc.org/musl
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100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
#define _GNU_SOURCE
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#include <sys/socket.h>
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#include <netdb.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <inttypes.h>
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int gethostbyname2_r(const char *name, int af,
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struct hostent *h, char *buf, size_t buflen,
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struct hostent **res, int *err)
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{
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struct addrinfo hint = {
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.ai_family = af==AF_INET6 ? af : AF_INET,
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.ai_flags = AI_CANONNAME
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};
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struct addrinfo *ai, *p;
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int i;
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size_t need;
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const char *canon;
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af = hint.ai_family;
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/* Align buffer */
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i = (uintptr_t)buf & sizeof(char *)-1;
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if (i) {
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if (buflen < sizeof(char *)-i) {
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errno = ERANGE;
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return -1;
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}
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buf += sizeof(char *)-i;
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buflen -= sizeof(char *)-i;
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}
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getaddrinfo(name, 0, &hint, &ai);
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switch (getaddrinfo(name, 0, &hint, &ai)) {
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case EAI_NONAME:
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*err = HOST_NOT_FOUND;
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return -1;
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case EAI_AGAIN:
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*err = TRY_AGAIN;
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return -1;
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default:
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case EAI_MEMORY:
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case EAI_SYSTEM:
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case EAI_FAIL:
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*err = NO_RECOVERY;
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return -1;
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case 0:
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break;
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}
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h->h_addrtype = af;
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h->h_length = af==AF_INET6 ? 16 : 4;
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canon = ai->ai_canonname ? ai->ai_canonname : name;
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need = 4*sizeof(char *);
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for (i=0, p=ai; p; i++, p=p->ai_next)
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need += sizeof(char *) + h->h_length;
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need += strlen(name)+1;
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need += strlen(canon)+1;
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if (need > buflen) {
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freeaddrinfo(ai);
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errno = ERANGE;
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return -1;
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}
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h->h_aliases = (void *)buf;
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buf += 3*sizeof(char *);
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h->h_addr_list = (void *)buf;
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buf += (i+1)*sizeof(char *);
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h->h_name = h->h_aliases[0] = buf;
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strcpy(h->h_name, canon);
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buf += strlen(h->h_name)+1;
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if (strcmp(h->h_name, name)) {
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h->h_aliases[1] = buf;
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strcpy(h->h_aliases[1], name);
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buf += strlen(h->h_aliases[1])+1;
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} else h->h_aliases[1] = 0;
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h->h_aliases[2] = 0;
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for (i=0, p=ai; p; i++, p=p->ai_next) {
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h->h_addr_list[i] = (void *)buf;
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buf += h->h_length;
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memcpy(h->h_addr_list[i],
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&((struct sockaddr_in *)p->ai_addr)->sin_addr,
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h->h_length);
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}
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h->h_addr_list[i] = 0;
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*res = h;
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freeaddrinfo(ai);
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return 0;
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}
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