diff options
Diffstat (limited to 'lib/libc/asr/gethostnamadr.c')
| -rw-r--r-- | lib/libc/asr/gethostnamadr.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/lib/libc/asr/gethostnamadr.c b/lib/libc/asr/gethostnamadr.c new file mode 100644 index 00000000000..8bce1116d28 --- /dev/null +++ b/lib/libc/asr/gethostnamadr.c @@ -0,0 +1,153 @@ +/* $OpenBSD: gethostnamadr.c,v 1.1 2012/09/08 11:08:21 eric Exp $ */ +/* + * Copyright (c) 2012 Eric Faurot <eric@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/types.h> +#include <netinet/in.h> + +#include <errno.h> +#include <resolv.h> +#include <stdlib.h> +#include <string.h> + +#include "asr.h" + +static struct hostent *_gethostbyname(const char *, int); +static void _fillhostent(const struct hostent *, struct hostent *, char *buf, + size_t); + +static struct hostent _hostent; +static char _entbuf[4096]; + +static char *_empty[] = { NULL, }; + +static void +_fillhostent(const struct hostent *h, struct hostent *r, char *buf, size_t len) +{ + char **ptr, *end, *pos; + size_t n, i; + int naliases, naddrs; + + end = buf + len; + ptr = (char**)buf; /* XXX align */ + + for (naliases = 0; h->h_aliases[naliases]; naliases++) + ; + for (naddrs = 0; h->h_addr_list[naddrs]; naddrs++) + ; + + r->h_name = NULL; + r->h_addrtype = h->h_addrtype; + r->h_length = h->h_length; + r->h_aliases = ptr; + r->h_addr_list = ptr + naliases + 1; + + pos = (char*)(ptr + (naliases + 1) + (naddrs + 1)); + if (pos > end) { + r->h_aliases = _empty; + r->h_addr_list = _empty; + return; + } + bzero(ptr, pos - (char*)ptr); + + n = strlcpy(pos, h->h_name, end - pos); + if (n >= end - pos) + return; + r->h_name = pos; + pos += n + 1; + + for(i = 0; i < naliases; i++) { + n = strlcpy(pos, h->h_aliases[i], end - pos); + if (n >= end - pos) + return; + r->h_aliases[i] = pos; + pos += n + 1; + } + + for(i = 0; i < naddrs; i++) { + if (r->h_length > end - pos) + return; + memmove(pos, h->h_addr_list[i], r->h_length); + r->h_addr_list[i] = pos; + pos += r->h_length; + } +} + +static struct hostent * +_gethostbyname(const char *name, int af) +{ + struct async *as; + struct async_res ar; + + if (af == -1) + as = gethostbyname_async(name, NULL); + else + as = gethostbyname2_async(name, af, NULL); + + if (as == NULL) { + h_errno = NETDB_INTERNAL; + return (NULL); + } + + async_run_sync(as, &ar); + + errno = ar.ar_errno; + h_errno = ar.ar_h_errno; + if (ar.ar_hostent == NULL) + return (NULL); + + _fillhostent(ar.ar_hostent, &_hostent, _entbuf, sizeof(_entbuf)); + free(ar.ar_hostent); + + return (&_hostent); +} + +struct hostent * +gethostbyname(const char *name) +{ + return _gethostbyname(name, -1); +} + +struct hostent * +gethostbyname2(const char *name, int af) +{ + return _gethostbyname(name, af); +} + +struct hostent * +gethostbyaddr(const void *addr, socklen_t len, int af) +{ + struct async *as; + struct async_res ar; + + as = gethostbyaddr_async(addr, len, af, NULL); + if (as == NULL) { + h_errno = NETDB_INTERNAL; + return (NULL); + } + + async_run_sync(as, &ar); + + errno = ar.ar_errno; + h_errno = ar.ar_h_errno; + if (ar.ar_hostent == NULL) + return (NULL); + + _fillhostent(ar.ar_hostent, &_hostent, _entbuf, sizeof(_entbuf)); + free(ar.ar_hostent); + + return (&_hostent); +} |