getproto.c 6.7 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265
  1. /*
  2. ** protocols.c /etc/protocols 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 __FORCE_GLIBC
  55. #define _GNU_SOURCE
  56. #include <features.h>
  57. #include <sys/types.h>
  58. #include <sys/socket.h>
  59. #include <netdb.h>
  60. #include <stdio.h>
  61. #include <stdlib.h>
  62. #include <string.h>
  63. #include <errno.h>
  64. #ifdef __UCLIBC_HAS_THREADS__
  65. # include <pthread.h>
  66. static pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
  67. #endif
  68. #define LOCK __pthread_mutex_lock(&mylock)
  69. #define UNLOCK __pthread_mutex_unlock(&mylock)
  70. #define MAXALIASES 35
  71. #define SBUFSIZE (BUFSIZ + 1 + (sizeof(char *) * MAXALIASES))
  72. static FILE *protof = NULL;
  73. static struct protoent proto;
  74. static char *static_aliases = NULL;
  75. static int proto_stayopen;
  76. static void __initbuf(void)
  77. {
  78. if (!static_aliases) {
  79. static_aliases = malloc(SBUFSIZE);
  80. if (!static_aliases)
  81. abort();
  82. }
  83. }
  84. void setprotoent(int f)
  85. {
  86. LOCK;
  87. if (protof == NULL)
  88. protof = fopen(_PATH_PROTOCOLS, "r" );
  89. else
  90. rewind(protof);
  91. proto_stayopen |= f;
  92. UNLOCK;
  93. }
  94. void endprotoent(void)
  95. {
  96. LOCK;
  97. if (protof) {
  98. fclose(protof);
  99. protof = NULL;
  100. }
  101. proto_stayopen = 0;
  102. UNLOCK;
  103. }
  104. int getprotoent_r(struct protoent *result_buf,
  105. char *buf, size_t buflen,
  106. struct protoent **result)
  107. {
  108. char *p;
  109. register char *cp, **q;
  110. char **proto_aliases;
  111. char *line;
  112. *result = NULL;
  113. if (buflen < sizeof(*proto_aliases)*MAXALIASES) {
  114. errno=ERANGE;
  115. return errno;
  116. }
  117. LOCK;
  118. proto_aliases=(char **)buf;
  119. buf+=sizeof(*proto_aliases)*MAXALIASES;
  120. buflen-=sizeof(*proto_aliases)*MAXALIASES;
  121. if (buflen < BUFSIZ+1) {
  122. UNLOCK;
  123. errno=ERANGE;
  124. return errno;
  125. }
  126. line=buf;
  127. buf+=BUFSIZ+1;
  128. buflen-=BUFSIZ+1;
  129. if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL) {
  130. UNLOCK;
  131. return errno;
  132. }
  133. again:
  134. if ((p = fgets(line, BUFSIZ, protof)) == NULL) {
  135. UNLOCK;
  136. return TRY_AGAIN;
  137. }
  138. if (*p == '#')
  139. goto again;
  140. cp = strpbrk(p, "#\n");
  141. if (cp == NULL)
  142. goto again;
  143. *cp = '\0';
  144. result_buf->p_name = p;
  145. cp = strpbrk(p, " \t");
  146. if (cp == NULL)
  147. goto again;
  148. *cp++ = '\0';
  149. while (*cp == ' ' || *cp == '\t')
  150. cp++;
  151. p = strpbrk(cp, " \t");
  152. if (p != NULL)
  153. *p++ = '\0';
  154. result_buf->p_proto = atoi(cp);
  155. q = result_buf->p_aliases = proto_aliases;
  156. if (p != NULL) {
  157. cp = p;
  158. while (cp && *cp) {
  159. if (*cp == ' ' || *cp == '\t') {
  160. cp++;
  161. continue;
  162. }
  163. if (q < &proto_aliases[MAXALIASES - 1])
  164. *q++ = cp;
  165. cp = strpbrk(cp, " \t");
  166. if (cp != NULL)
  167. *cp++ = '\0';
  168. }
  169. }
  170. *q = NULL;
  171. *result=result_buf;
  172. UNLOCK;
  173. return 0;
  174. }
  175. struct protoent * getprotoent(void)
  176. {
  177. struct protoent *result;
  178. __initbuf();
  179. getprotoent_r(&proto, static_aliases, SBUFSIZE, &result);
  180. return result;
  181. }
  182. int getprotobyname_r(const char *name,
  183. struct protoent *result_buf,
  184. char *buf, size_t buflen,
  185. struct protoent **result)
  186. {
  187. register char **cp;
  188. int ret;
  189. LOCK;
  190. setprotoent(proto_stayopen);
  191. while (!(ret=getprotoent_r(result_buf, buf, buflen, result))) {
  192. if (__strcmp(result_buf->p_name, name) == 0)
  193. break;
  194. for (cp = result_buf->p_aliases; *cp != 0; cp++)
  195. if (__strcmp(*cp, name) == 0)
  196. goto found;
  197. }
  198. found:
  199. if (!proto_stayopen)
  200. endprotoent();
  201. UNLOCK;
  202. return *result?0:ret;
  203. }
  204. struct protoent * getprotobyname(const char *name)
  205. {
  206. struct protoent *result;
  207. __initbuf();
  208. getprotobyname_r(name, &proto, static_aliases, SBUFSIZE, &result);
  209. return result;
  210. }
  211. int getprotobynumber_r (int proto_num,
  212. struct protoent *result_buf,
  213. char *buf, size_t buflen,
  214. struct protoent **result)
  215. {
  216. int ret;
  217. LOCK;
  218. setprotoent(proto_stayopen);
  219. while (!(ret=getprotoent_r(result_buf, buf, buflen, result)))
  220. if (result_buf->p_proto == proto_num)
  221. break;
  222. if (!proto_stayopen)
  223. endprotoent();
  224. UNLOCK;
  225. return *result?0:ret;
  226. }
  227. struct protoent * getprotobynumber(int proto_num)
  228. {
  229. struct protoent *result;
  230. __initbuf();
  231. getprotobynumber_r(proto_num, &proto, static_aliases,
  232. SBUFSIZE, &result);
  233. return result;
  234. }