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Diffstat (limited to 'mit-pthreads/net/gethostent.c')
| -rw-r--r-- | mit-pthreads/net/gethostent.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/mit-pthreads/net/gethostent.c b/mit-pthreads/net/gethostent.c new file mode 100644 index 00000000000..d6feb7aa164 --- /dev/null +++ b/mit-pthreads/net/gethostent.c @@ -0,0 +1,162 @@ +/* + * Copyright (c) 1983 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +/*static char *sccsid = "from: @(#)gethostent.c 5.8 (Berkeley) 2/24/91";*/ +static char *rcsid = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +#include <pthread.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netdb.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include "res_internal.h" + +static pthread_mutex_t res_file_lock = PTHREAD_MUTEX_INITIALIZER; +static int res_file_stayopen; +static FILE *res_file; + +void sethostent(int stayopen) +{ + pthread_mutex_lock(&res_file_lock); + res_file_stayopen |= stayopen; + if (res_file) + rewind(res_file); + else + res_file = fopen(_PATH_HOSTS, "r"); + pthread_mutex_unlock(&res_file_lock); +} + +void endhostent() +{ + pthread_mutex_lock(&res_file_lock); + if (res_file) + fclose(res_file); + pthread_mutex_unlock(&res_file_lock); +} + +struct hostent *gethostent() +{ + struct res_data *data = _res_init(); + + if (!data) + return NULL; + if (!data->buf) { + data->buf = malloc(sizeof(struct hostent) + HOST_BUFSIZE); + if (!data->buf) { + data->errval = NO_RECOVERY; + return NULL; + } + } + return gethostent_r((struct hostent *) data->buf, + data->buf + sizeof(struct hostent), HOST_BUFSIZE, + &data->errval); +} + +struct hostent *gethostent_r(struct hostent *result, char *buf, int bufsize, + int *errval) +{ + char *p, **alias; + struct in_addr *addr; + int l; + + errno = 0; + pthread_mutex_lock(&res_file_lock); + if (res_file == NULL && (res_file = fopen(_PATH_HOSTS, "r")) == NULL) { + pthread_mutex_unlock(&res_file_lock); + return NULL; + } + while (fgets(buf, bufsize, res_file)) { + if (*buf == '#') + continue; + p = strpbrk(buf, "#\n"); + if (p == NULL) + continue; + l = strlen(buf) + 1; + *p = '\0'; + p = strpbrk(buf, " \t"); + if (p == NULL) + continue; + *p++ = '\0'; + + /* THIS STUFF IS INTERNET SPECIFIC */ + if (SP(SP(SP(buf, char, l), *addr, 1), char *, 3) > buf + bufsize) { + errno = ERANGE; + break; + } + addr = (struct in_addr *) ALIGN(buf + l, struct in_addr); + if (inet_aton(buf, addr) == 0) + continue; + result->h_length = sizeof(*addr); + result->h_addrtype = AF_INET; + result->h_addr_list = (char **) ALIGN(addr + sizeof(*addr), char *); + result->h_addr_list[0] = (char *) addr; + result->h_addr_list[1] = NULL; + result->h_aliases = result->h_addr_list + 2; + while (*p == ' ' || *p == '\t') + p++; + result->h_name = p; + alias = result->h_aliases; + p = strpbrk(p, " \t"); + if (p != NULL) + *p++ = '\0'; + while (p && *p) { + if (*p == ' ' || *p == '\t') { + p++; + continue; + } + if ((char *) &alias[2] > buf + bufsize) { + errno = ERANGE; + break; + } + *alias++ = p; + p = strpbrk(p, " \t"); + if (p != NULL) + *p++ = '\0'; + } + if (p && *p) + break; + *alias = NULL; + pthread_mutex_unlock(&res_file_lock); + return result; + } + + pthread_mutex_unlock(&res_file_lock); + *errval = (errno == ERANGE) ? NO_RECOVERY : 0; + return NULL; +} + |