/* ** protocols.c /etc/protocols access functions ** ** This file is part of the NYS Library. ** ** The NYS Library is free software; you can redistribute it and/or ** modify it under the terms of the GNU Library General Public License as ** published by the Free Software Foundation; either version 2 of the ** License, or (at your option) any later version. ** ** The NYS Library is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ** Library General Public License for more details. ** ** You should have received a copy of the GNU Library General Public ** License along with the NYS Library; see the file COPYING.LIB. If ** not, write to the Free Software Foundation, Inc., 675 Mass Ave, ** Cambridge, MA 02139, USA. ** ** ** 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. */ #define __FORCE_GLIBC #define _GNU_SOURCE #include <features.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #ifdef __UCLIBC_HAS_THREADS__ #include <pthread.h> static pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; # define LOCK __pthread_mutex_lock(&mylock) # define UNLOCK __pthread_mutex_unlock(&mylock); #else # define LOCK # define UNLOCK #endif #define MAXALIASES 35 #define SBUFSIZE (BUFSIZ + 1 + (sizeof(char *) * MAXALIASES)) static FILE *protof = NULL; static struct protoent proto; static char *static_aliases = NULL; static int proto_stayopen; static void __initbuf(void) { if (!static_aliases) { static_aliases = malloc(SBUFSIZE); if (!static_aliases) abort(); } } void setprotoent(int f) { LOCK; if (protof == NULL) protof = fopen(_PATH_PROTOCOLS, "r" ); else rewind(protof); proto_stayopen |= f; UNLOCK; } void endprotoent(void) { LOCK; if (protof) { fclose(protof); protof = NULL; } proto_stayopen = 0; UNLOCK; } int getprotoent_r(struct protoent *result_buf, char *buf, size_t buflen, struct protoent **result) { char *p; register char *cp, **q; char **proto_aliases; char *line; *result = NULL; if (buflen < sizeof(*proto_aliases)*MAXALIASES) { errno=ERANGE; return errno; } LOCK; proto_aliases=(char **)buf; buf+=sizeof(*proto_aliases)*MAXALIASES; buflen-=sizeof(*proto_aliases)*MAXALIASES; if (buflen < BUFSIZ+1) { UNLOCK; errno=ERANGE; return errno; } line=buf; buf+=BUFSIZ+1; buflen-=BUFSIZ+1; if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL) { UNLOCK; return errno; } again: if ((p = fgets(line, BUFSIZ, protof)) == NULL) { UNLOCK; return TRY_AGAIN; } if (*p == '#') goto again; cp = strpbrk(p, "#\n"); if (cp == NULL) goto again; *cp = '\0'; result_buf->p_name = p; cp = strpbrk(p, " \t"); if (cp == NULL) goto again; *cp++ = '\0'; while (*cp == ' ' || *cp == '\t') cp++; p = strpbrk(cp, " \t"); if (p != NULL) *p++ = '\0'; result_buf->p_proto = atoi(cp); q = result_buf->p_aliases = proto_aliases; if (p != NULL) { cp = p; while (cp && *cp) { if (*cp == ' ' || *cp == '\t') { cp++; continue; } if (q < &proto_aliases[MAXALIASES - 1]) *q++ = cp; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; } } *q = NULL; *result=result_buf; UNLOCK; return 0; } struct protoent * getprotoent(void) { struct protoent *result; __initbuf(); getprotoent_r(&proto, static_aliases, SBUFSIZE, &result); return result; } int getprotobyname_r(const char *name, struct protoent *result_buf, char *buf, size_t buflen, struct protoent **result) { register char **cp; int ret; LOCK; setprotoent(proto_stayopen); while (!(ret=getprotoent_r(result_buf, buf, buflen, result))) { if (strcmp(result_buf->p_name, name) == 0) break; for (cp = result_buf->p_aliases; *cp != 0; cp++) if (strcmp(*cp, name) == 0) goto found; } found: if (!proto_stayopen) endprotoent(); UNLOCK; return *result?0:ret; } struct protoent * getprotobyname(const char *name) { struct protoent *result; __initbuf(); getprotobyname_r(name, &proto, static_aliases, SBUFSIZE, &result); return result; } int getprotobynumber_r (int proto_num, struct protoent *result_buf, char *buf, size_t buflen, struct protoent **result) { int ret; LOCK; setprotoent(proto_stayopen); while (!(ret=getprotoent_r(result_buf, buf, buflen, result))) if (result_buf->p_proto == proto_num) break; if (!proto_stayopen) endprotoent(); UNLOCK; return *result?0:ret; } struct protoent * getprotobynumber(int proto_num) { struct protoent *result; __initbuf(); getprotobynumber_r(proto_num, &proto, static_aliases, SBUFSIZE, &result); return result; }