diff options
Diffstat (limited to 'libc-top-half/musl/src/network/gethostbyname2_r.c')
-rw-r--r-- | libc-top-half/musl/src/network/gethostbyname2_r.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/network/gethostbyname2_r.c b/libc-top-half/musl/src/network/gethostbyname2_r.c new file mode 100644 index 0000000..fc89487 --- /dev/null +++ b/libc-top-half/musl/src/network/gethostbyname2_r.c @@ -0,0 +1,80 @@ +#define _GNU_SOURCE + +#include <sys/socket.h> +#include <netdb.h> +#include <string.h> +#include <netinet/in.h> +#include <errno.h> +#include <stdint.h> +#include "lookup.h" + +int gethostbyname2_r(const char *name, int af, + struct hostent *h, char *buf, size_t buflen, + struct hostent **res, int *err) +{ + struct address addrs[MAXADDRS]; + char canon[256]; + int i, cnt; + size_t align, need; + + *res = 0; + cnt = __lookup_name(addrs, canon, name, af, AI_CANONNAME); + if (cnt<0) switch (cnt) { + case EAI_NONAME: + *err = HOST_NOT_FOUND; + return ENOENT; + case EAI_AGAIN: + *err = TRY_AGAIN; + return EAGAIN; + default: + case EAI_FAIL: + *err = NO_RECOVERY; + return EBADMSG; + case EAI_MEMORY: + case EAI_SYSTEM: + *err = NO_RECOVERY; + return errno; + } + + h->h_addrtype = af; + h->h_length = af==AF_INET6 ? 16 : 4; + + /* Align buffer */ + align = -(uintptr_t)buf & sizeof(char *)-1; + + need = 4*sizeof(char *); + need += (cnt + 1) * (sizeof(char *) + h->h_length); + need += strlen(name)+1; + need += strlen(canon)+1; + need += align; + + if (need > buflen) return ERANGE; + + buf += align; + h->h_aliases = (void *)buf; + buf += 3*sizeof(char *); + h->h_addr_list = (void *)buf; + buf += (cnt+1)*sizeof(char *); + + for (i=0; i<cnt; i++) { + h->h_addr_list[i] = (void *)buf; + buf += h->h_length; + memcpy(h->h_addr_list[i], addrs[i].addr, h->h_length); + } + h->h_addr_list[i] = 0; + + h->h_name = h->h_aliases[0] = buf; + strcpy(h->h_name, canon); + buf += strlen(h->h_name)+1; + + if (strcmp(h->h_name, name)) { + h->h_aliases[1] = buf; + strcpy(h->h_aliases[1], name); + buf += strlen(h->h_aliases[1])+1; + } else h->h_aliases[1] = 0; + + h->h_aliases[2] = 0; + + *res = h; + return 0; +} |