getservice.c 7.4 KB

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  1. /*
  2. ** services.c /etc/services access functions
  3. **
  4. ** This file is part of the NYS Library.
  5. **
  6. ** The NYS Library is free software; you can redistribute it and/or
  7. ** modify it under the terms of the GNU Library General Public License as
  8. ** published by the Free Software Foundation; either version 2 of the
  9. ** License, or (at your option) any later version.
  10. **
  11. ** The NYS Library is distributed in the hope that it will be useful,
  12. ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. ** Library General Public License for more details.
  15. **
  16. ** You should have received a copy of the GNU Library General Public
  17. ** License along with the NYS Library; see the file COPYING.LIB. If
  18. ** not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  19. ** Cambridge, MA 02139, USA.
  20. **
  21. **
  22. ** Copyright (c) 1983 Regents of the University of California.
  23. ** All rights reserved.
  24. **
  25. ** Redistribution and use in source and binary forms, with or without
  26. ** modification, are permitted provided that the following conditions
  27. ** are met:
  28. ** 1. Redistributions of source code must retain the above copyright
  29. ** notice, this list of conditions and the following disclaimer.
  30. ** 2. Redistributions in binary form must reproduce the above copyright
  31. ** notice, this list of conditions and the following disclaimer in the
  32. ** documentation and/or other materials provided with the distribution.
  33. ** 3. All advertising materials mentioning features or use of this software
  34. ** must display the following acknowledgement:
  35. ** This product includes software developed by the University of
  36. ** California, Berkeley and its contributors.
  37. ** 4. Neither the name of the University nor the names of its contributors
  38. ** may be used to endorse or promote products derived from this software
  39. ** without specific prior written permission.
  40. **
  41. ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  42. ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43. ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44. ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  45. ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46. ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47. ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48. ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49. ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50. ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51. ** SUCH DAMAGE.
  52. */
  53. #define strpbrk __strpbrk
  54. #define atoi __atoi
  55. #define rewind __rewind
  56. #define fgets __fgets
  57. #define __FORCE_GLIBC
  58. #define _GNU_SOURCE
  59. #include <features.h>
  60. #include <sys/types.h>
  61. #include <sys/socket.h>
  62. #include <netdb.h>
  63. #include <stdio.h>
  64. #include <string.h>
  65. #include <stdlib.h>
  66. #include <netinet/in.h>
  67. #include <arpa/inet.h>
  68. #include <errno.h>
  69. #ifdef __UCLIBC_HAS_THREADS__
  70. # include <pthread.h>
  71. static pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
  72. #endif
  73. #define LOCK __pthread_mutex_lock(&mylock)
  74. #define UNLOCK __pthread_mutex_unlock(&mylock)
  75. #define MAXALIASES 35
  76. #define SBUFSIZE (BUFSIZ + 1 + (sizeof(char *) * MAXALIASES))
  77. static FILE *servf = NULL;
  78. static struct servent serv;
  79. static char *servbuf = NULL;
  80. static int serv_stayopen;
  81. static void __initbuf(void)
  82. {
  83. if (!servbuf) {
  84. servbuf = malloc(SBUFSIZE);
  85. if (!servbuf)
  86. abort();
  87. }
  88. }
  89. extern void attribute_hidden __setservent(int f)
  90. {
  91. LOCK;
  92. if (servf == NULL)
  93. servf = fopen(_PATH_SERVICES, "r" );
  94. else
  95. rewind(servf);
  96. serv_stayopen |= f;
  97. UNLOCK;
  98. }
  99. strong_alias(__setservent,setservent)
  100. extern void attribute_hidden __endservent(void)
  101. {
  102. LOCK;
  103. if (servf) {
  104. fclose(servf);
  105. servf = NULL;
  106. }
  107. serv_stayopen = 0;
  108. UNLOCK;
  109. }
  110. strong_alias(__endservent,endservent)
  111. extern int attribute_hidden __getservent_r(struct servent * result_buf,
  112. char * buf, size_t buflen,
  113. struct servent ** result)
  114. {
  115. char *p;
  116. register char *cp, **q;
  117. char **serv_aliases;
  118. char *line;
  119. *result=NULL;
  120. if (buflen < sizeof(*serv_aliases)*MAXALIASES) {
  121. errno=ERANGE;
  122. return errno;
  123. }
  124. LOCK;
  125. serv_aliases=(char **)buf;
  126. buf+=sizeof(*serv_aliases)*MAXALIASES;
  127. buflen-=sizeof(*serv_aliases)*MAXALIASES;
  128. if (buflen < BUFSIZ+1) {
  129. UNLOCK;
  130. errno=ERANGE;
  131. return errno;
  132. }
  133. line=buf;
  134. buf+=BUFSIZ+1;
  135. buflen-=BUFSIZ+1;
  136. if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL) {
  137. UNLOCK;
  138. errno=EIO;
  139. return errno;
  140. }
  141. again:
  142. if ((p = fgets(line, BUFSIZ, servf)) == NULL) {
  143. UNLOCK;
  144. errno=EIO;
  145. return errno;
  146. }
  147. if (*p == '#')
  148. goto again;
  149. cp = strpbrk(p, "#\n");
  150. if (cp == NULL)
  151. goto again;
  152. *cp = '\0';
  153. result_buf->s_name = p;
  154. p = strpbrk(p, " \t");
  155. if (p == NULL)
  156. goto again;
  157. *p++ = '\0';
  158. while (*p == ' ' || *p == '\t')
  159. p++;
  160. cp = strpbrk(p, ",/");
  161. if (cp == NULL)
  162. goto again;
  163. *cp++ = '\0';
  164. result_buf->s_port = htons((u_short)atoi(p));
  165. result_buf->s_proto = cp;
  166. q = result_buf->s_aliases = serv_aliases;
  167. cp = strpbrk(cp, " \t");
  168. if (cp != NULL)
  169. *cp++ = '\0';
  170. while (cp && *cp) {
  171. if (*cp == ' ' || *cp == '\t') {
  172. cp++;
  173. continue;
  174. }
  175. if (q < &serv_aliases[MAXALIASES - 1])
  176. *q++ = cp;
  177. cp = strpbrk(cp, " \t");
  178. if (cp != NULL)
  179. *cp++ = '\0';
  180. }
  181. *q = NULL;
  182. *result=result_buf;
  183. UNLOCK;
  184. return 0;
  185. }
  186. strong_alias(__getservent_r,getservent_r)
  187. struct servent * getservent(void)
  188. {
  189. struct servent *result;
  190. __initbuf();
  191. __getservent_r(&serv, servbuf, SBUFSIZE, &result);
  192. return result;
  193. }
  194. extern int attribute_hidden __getservbyname_r(const char *name, const char *proto,
  195. struct servent * result_buf, char * buf, size_t buflen,
  196. struct servent ** result)
  197. {
  198. register char **cp;
  199. int ret;
  200. LOCK;
  201. __setservent(serv_stayopen);
  202. while (!(ret=__getservent_r(result_buf, buf, buflen, result))) {
  203. if (__strcmp(name, result_buf->s_name) == 0)
  204. goto gotname;
  205. for (cp = result_buf->s_aliases; *cp; cp++)
  206. if (__strcmp(name, *cp) == 0)
  207. goto gotname;
  208. continue;
  209. gotname:
  210. if (proto == 0 || __strcmp(result_buf->s_proto, proto) == 0)
  211. break;
  212. }
  213. if (!serv_stayopen)
  214. __endservent();
  215. UNLOCK;
  216. return *result?0:ret;
  217. }
  218. strong_alias(__getservbyname_r,getservbyname_r)
  219. struct servent *getservbyname(const char *name, const char *proto)
  220. {
  221. struct servent *result;
  222. __initbuf();
  223. __getservbyname_r(name, proto, &serv, servbuf, SBUFSIZE, &result);
  224. return result;
  225. }
  226. extern int attribute_hidden __getservbyport_r(int port, const char *proto,
  227. struct servent * result_buf, char * buf,
  228. size_t buflen, struct servent ** result)
  229. {
  230. int ret;
  231. LOCK;
  232. __setservent(serv_stayopen);
  233. while (!(ret=__getservent_r(result_buf, buf, buflen, result))) {
  234. if (result_buf->s_port != port)
  235. continue;
  236. if (proto == 0 || __strcmp(result_buf->s_proto, proto) == 0)
  237. break;
  238. }
  239. if (!serv_stayopen)
  240. __endservent();
  241. UNLOCK;
  242. return *result?0:ret;
  243. }
  244. strong_alias(__getservbyport_r,getservbyport_r)
  245. struct servent attribute_hidden * __getservbyport(int port, const char *proto)
  246. {
  247. struct servent *result;
  248. __initbuf();
  249. __getservbyport_r(port, proto, &serv, servbuf, SBUFSIZE, &result);
  250. return result;
  251. }
  252. strong_alias(__getservbyport,getservbyport)