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author | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
commit | 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch) | |
tree | 6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/network/gethostbyaddr_r.c | |
download | musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.xz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.zip |
initial check-in, version 0.5.0 v0.5.0
Diffstat (limited to 'src/network/gethostbyaddr_r.c')
-rw-r--r-- | src/network/gethostbyaddr_r.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/network/gethostbyaddr_r.c b/src/network/gethostbyaddr_r.c new file mode 100644 index 00000000..cdb1d503 --- /dev/null +++ b/src/network/gethostbyaddr_r.c @@ -0,0 +1,71 @@ +#define _GNU_SOURCE + +#include <sys/socket.h> +#include <netdb.h> +#include <string.h> +#include <netinet/in.h> +#include <errno.h> +#include <inttypes.h> + +int gethostbyaddr_r(const void *a, socklen_t l, int af, + struct hostent *h, char *buf, size_t buflen, + struct hostent **res, int *err) +{ + union { + struct sockaddr_in sin; + struct sockaddr_in6 sin6; + } sa = { .sin.sin_family = af }; + socklen_t sl = af==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin; + int i; + + /* Load address argument into sockaddr structure */ + if (af==AF_INET6 && l==16) memcpy(&sa.sin6.sin6_addr, a, 16); + else if (af==AF_INET && l==4) memcpy(&sa.sin.sin_addr, a, 4); + else { + *err = NO_RECOVERY; + return -1; + } + + /* Align buffer and check for space for pointers and ip address */ + i = (uintptr_t)buf & sizeof(char *)-1; + if (!i) i = sizeof(char *); + if (buflen <= 5*sizeof(char *)-i + l) { + errno = ERANGE; + return -1; + } + buf += sizeof(char *)-i; + buflen -= 5*sizeof(char *)-i + l; + + h->h_addr_list = (void *)buf; + buf += 2*sizeof(char *); + h->h_aliases = (void *)buf; + buf += 2*sizeof(char *); + + h->h_addr_list[0] = buf; + memcpy(h->h_addr_list[0], a, l); + buf += l; + h->h_addr_list[1] = 0; + h->h_aliases[0] = buf; + h->h_aliases[1] = 0; + + switch (getnameinfo((void *)&sa, sl, buf, buflen, 0, 0, 0)) { + case EAI_AGAIN: + *err = TRY_AGAIN; + return -1; + case EAI_OVERFLOW: + errno = ERANGE; + default: + case EAI_MEMORY: + case EAI_SYSTEM: + case EAI_FAIL: + *err = NO_RECOVERY; + return -1; + case 0: + break; + } + + h->h_addrtype = af; + h->h_name = h->h_aliases[0]; + *res = h; + return 0; +} |