/* $OpenBSD: getservent.c,v 1.15 2015/09/14 07:38:38 guenther Exp $ */ /* * Copyright (c) 1983, 1993 * The 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. 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. */ #include <sys/types.h> #include <sys/socket.h> #include <errno.h> #include <limits.h> #include <netdb.h> #include <stdio.h> #include <string.h> #include <stdlib.h> void setservent_r(int f, struct servent_data *sd) { if (sd->fp == NULL) sd->fp = fopen(_PATH_SERVICES, "re" ); else rewind(sd->fp); sd->stayopen |= f; } DEF_WEAK(setservent_r); void endservent_r(struct servent_data *sd) { if (sd->fp) { fclose(sd->fp); sd->fp = NULL; } free(sd->aliases); sd->aliases = NULL; sd->maxaliases = 0; free(sd->line); sd->line = NULL; sd->stayopen = 0; } DEF_WEAK(endservent_r); int getservent_r(struct servent *se, struct servent_data *sd) { char *p, *cp, **q, *endp; size_t len; long l; int serrno; if (sd->fp == NULL && (sd->fp = fopen(_PATH_SERVICES, "re" )) == NULL) return (-1); again: if ((p = fgetln(sd->fp, &len)) == NULL) return (-1); if (len == 0 || *p == '#' || *p == '\n') goto again; if (p[len-1] == '\n') len--; if ((cp = memchr(p, '#', len)) != NULL) len = cp - p; cp = realloc(sd->line, len + 1); if (cp == NULL) return (-1); sd->line = se->s_name = memcpy(cp, p, len); cp[len] = '\0'; p = strpbrk(cp, " \t"); if (p == NULL) goto again; *p++ = '\0'; while (*p == ' ' || *p == '\t') p++; cp = strpbrk(p, ",/"); if (cp == NULL) goto again; *cp++ = '\0'; l = strtol(p, &endp, 10); if (endp == p || *endp != '\0' || l < 0 || l > USHRT_MAX) goto again; se->s_port = htons((in_port_t)l); se->s_proto = cp; if (sd->aliases == NULL) { sd->maxaliases = 10; sd->aliases = calloc(sd->maxaliases, sizeof(char *)); if (sd->aliases == NULL) { serrno = errno; endservent_r(sd); errno = serrno; return (-1); } } q = se->s_aliases = sd->aliases; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; while (cp && *cp) { if (*cp == ' ' || *cp == '\t') { cp++; continue; } if (q == &se->s_aliases[sd->maxaliases - 1]) { p = reallocarray(se->s_aliases, sd->maxaliases, 2 * sizeof(char *)); if (p == NULL) { serrno = errno; endservent_r(sd); errno = serrno; return (-1); } sd->maxaliases *= 2; q = (char **)p + (q - se->s_aliases); se->s_aliases = sd->aliases = (char **)p; } *q++ = cp; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; } *q = NULL; return (0); } DEF_WEAK(getservent_r); struct servent_data _servent_data; /* shared with getservby{name,port}.c */ void setservent(int f) { setservent_r(f, &_servent_data); } void endservent(void) { endservent_r(&_servent_data); } struct servent * getservent(void) { static struct servent serv; if (getservent_r(&serv, &_servent_data) != 0) return (NULL); return (&serv); }