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-rw-r--r--lib/libc/gen/getgrent.c553
1 files changed, 553 insertions, 0 deletions
diff --git a/lib/libc/gen/getgrent.c b/lib/libc/gen/getgrent.c
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+++ b/lib/libc/gen/getgrent.c
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+/*
+ * Copyright (c) 1989, 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. 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[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <grp.h>
+
+static FILE *_gr_fp;
+static struct group _gr_group;
+static int _gr_stayopen;
+static int grscan(), start_gr();
+#ifdef YP
+#include <rpc/rpc.h>
+#include <rpcsvc/yp_prot.h>
+#include <rpcsvc/ypclnt.h>
+static int _gr_stepping_yp;
+static int _gr_yp_enabled;
+static int _getypgroup(struct group *, const char *, char *);
+static int _nextypgroup(struct group *);
+#endif
+
+/* initial size for malloc and increase steps for realloc */
+#define MAXGRP 64
+#define MAXLINELENGTH 256
+
+static char **members; /* list of group members */
+static int maxgrp; /* current length of **mebers */
+static char *line; /* temp buffer for group line */
+static int maxlinelength; /* current length of *line */
+
+/*
+ * Lines longer than MAXLINELENGTHLIMIT will be count as an error.
+ * <= 0 disable check for maximum line length
+ * 256K is enough for 64,000 uids
+ */
+#define MAXLINELENGTHLIMIT (256 * 1024)
+#define GROUP_IGNORE_COMMENTS 1 /* allow comments in /etc/group */
+
+struct group *
+getgrent()
+{
+ if (!_gr_fp && !start_gr()) {
+ return NULL;
+ }
+
+#ifdef YP
+ if (_gr_stepping_yp) {
+ if (_nextypgroup(&_gr_group))
+ return(&_gr_group);
+ }
+tryagain:
+#endif
+
+ if (!grscan(0, 0, NULL))
+ return(NULL);
+#ifdef YP
+ if(_gr_group.gr_name[0] == '+' && _gr_group.gr_name[1]) {
+ _getypgroup(&_gr_group, &_gr_group.gr_name[1],
+ "group.byname");
+ } else if(_gr_group.gr_name[0] == '+') {
+ if (!_nextypgroup(&_gr_group))
+ goto tryagain;
+ else
+ return(&_gr_group);
+ }
+#endif
+ return(&_gr_group);
+}
+
+struct group *
+getgrnam(name)
+ const char *name;
+{
+ int rval;
+
+ if (!start_gr())
+ return(NULL);
+#ifdef YP
+ tryagain:
+#endif
+ rval = grscan(1, 0, name);
+#ifdef YP
+ if(rval == -1 && (_gr_yp_enabled < 0 || (_gr_yp_enabled &&
+ _gr_group.gr_name[0] == '+'))) {
+ if (!(rval = _getypgroup(&_gr_group, name, "group.byname")))
+ goto tryagain;
+ }
+#endif
+ if (!_gr_stayopen)
+ endgrent();
+ return(rval ? &_gr_group : NULL);
+}
+
+struct group *
+#ifdef __STDC__
+getgrgid(gid_t gid)
+#else
+getgrgid(gid)
+ gid_t gid;
+#endif
+{
+ int rval;
+
+ if (!start_gr())
+ return(NULL);
+#ifdef YP
+ tryagain:
+#endif
+ rval = grscan(1, gid, NULL);
+#ifdef YP
+ if(rval == -1 && _gr_yp_enabled) {
+ char buf[16];
+ snprintf(buf, sizeof buf, "%d", (unsigned)gid);
+ if (!(rval = _getypgroup(&_gr_group, buf, "group.bygid")))
+ goto tryagain;
+ }
+#endif
+ if (!_gr_stayopen)
+ endgrent();
+ return(rval ? &_gr_group : NULL);
+}
+
+static int
+start_gr()
+{
+ if (_gr_fp) {
+ rewind(_gr_fp);
+ return(1);
+ }
+ _gr_fp = fopen(_PATH_GROUP, "r");
+ if(!_gr_fp) return 0;
+#ifdef YP
+ /*
+ * This is a disgusting hack, used to determine when YP is enabled.
+ * This would be easier if we had a group database to go along with
+ * the password database.
+ */
+ {
+ char *line;
+ size_t linelen;
+ _gr_yp_enabled = 0;
+ while((line = fgetln(_gr_fp, &linelen)) != NULL) {
+ if(line[0] == '+') {
+ if(line[1] && line[1] != ':' && !_gr_yp_enabled) {
+ _gr_yp_enabled = 1;
+ } else {
+ _gr_yp_enabled = -1;
+ break;
+ }
+ }
+ }
+ rewind(_gr_fp);
+ }
+#endif
+
+ if (maxlinelength == 0) {
+ if ((line = (char *)malloc(sizeof(char) *
+ MAXLINELENGTH)) == NULL)
+ return(0);
+ maxlinelength += MAXLINELENGTH;
+ }
+
+ if (maxgrp == 0) {
+ if ((members = (char **)malloc(sizeof(char **) *
+ MAXGRP)) == NULL)
+ return(0);
+ maxgrp += MAXGRP;
+ }
+
+ return 1;
+}
+
+int
+setgrent()
+{
+ return(setgroupent(0));
+}
+
+int
+setgroupent(stayopen)
+ int stayopen;
+{
+ if (!start_gr())
+ return(0);
+ _gr_stayopen = stayopen;
+#ifdef YP
+ _gr_stepping_yp = 0;
+#endif
+ return(1);
+}
+
+void
+endgrent()
+{
+#ifdef YP
+ _gr_stepping_yp = 0;
+#endif
+ if (_gr_fp) {
+ (void)fclose(_gr_fp);
+ _gr_fp = NULL;
+ }
+}
+
+static int
+grscan(search, gid, name)
+ register int search, gid;
+ register char *name;
+{
+ register char *cp, **m;
+ char *bp;
+
+
+#ifdef YP
+ int _ypfound;
+#endif
+ for (;;) {
+#ifdef YP
+ _ypfound = 0;
+#endif
+ if (fgets(line, maxlinelength, _gr_fp) == NULL)
+ return(0);
+
+ if (!index(line, '\n')) {
+ do {
+ if (feof(_gr_fp))
+ return(0);
+
+ /* don't allocate infinite memory */
+ if (MAXLINELENGTHLIMIT > 0 &&
+ maxlinelength >= MAXLINELENGTHLIMIT)
+ return(0);
+
+ if ((line = (char *)reallocf(line,
+ sizeof(char) *
+ (maxlinelength + MAXLINELENGTH))) == NULL)
+ return(0);
+
+ if (fgets(line + maxlinelength - 1,
+ MAXLINELENGTH + 1, _gr_fp) == NULL)
+ return(0);
+
+ maxlinelength += MAXLINELENGTH;
+ } while (!index(line + maxlinelength -
+ MAXLINELENGTH - 1, '\n'));
+ }
+
+#ifdef GROUP_IGNORE_COMMENTS
+ /*
+ * Ignore comments: ^[ \t]*#
+ */
+ for (cp = line; *cp != '\0'; cp++)
+ if (*cp != ' ' && *cp != '\t')
+ break;
+ if (*cp == '#' || *cp == '\0')
+ continue;
+#endif
+
+ bp = line;
+
+ if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
+ break;
+#ifdef YP
+ /*
+ * XXX We need to be careful to avoid proceeding
+ * past this point under certain circumstances or
+ * we risk dereferencing null pointers down below.
+ */
+ if (_gr_group.gr_name[0] == '+') {
+ if (strlen(_gr_group.gr_name) == 1) {
+ switch(search) {
+ case 0:
+ return(1);
+ case 1:
+ return(-1);
+ default:
+ return(0);
+ }
+ } else {
+ cp = &_gr_group.gr_name[1];
+ if (search && name != NULL)
+ if (strcmp(cp, name))
+ continue;
+ if (!_getypgroup(&_gr_group, cp,
+ "group.byname"))
+ continue;
+ if (search && name == NULL)
+ if (gid != _gr_group.gr_gid)
+ continue;
+ /* We're going to override -- tell the world. */
+ _ypfound++;
+ }
+ }
+#else
+ if (_gr_group.gr_name[0] == '+')
+ continue;
+#endif /* YP */
+ if (search && name) {
+ if(strcmp(_gr_group.gr_name, name)) {
+ continue;
+ }
+ }
+#ifdef YP
+ if ((cp = strsep(&bp, ":\n")) == NULL)
+ if (_ypfound)
+ return(1);
+ else
+ break;
+ if (strlen(cp) || !_ypfound)
+ _gr_group.gr_passwd = cp;
+#else
+ if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
+ break;
+#endif
+ if (!(cp = strsep(&bp, ":\n")))
+#ifdef YP
+ if (_ypfound)
+ return(1);
+ else
+#endif
+ continue;
+#ifdef YP
+ /*
+ * Hurm. Should we be doing this? We allow UIDs to
+ * be overridden -- what about GIDs?
+ */
+ if (!_ypfound)
+#endif
+ _gr_group.gr_gid = atoi(cp);
+ if (search && name == NULL && _gr_group.gr_gid != gid)
+ continue;
+ cp = NULL;
+ if (bp == NULL) /* !!! Must check for this! */
+ break;
+#ifdef YP
+ if ((cp = strsep(&bp, ":\n")) == NULL)
+ break;
+
+ if (!strlen(cp) && _ypfound)
+ return(1);
+ else
+ members[0] = NULL;
+ bp = cp;
+ cp = NULL;
+#endif
+ for (m = members; ; bp++) {
+ if (m == (members + maxgrp - 1)) {
+ if ((members = (char **)
+ reallocf(members,
+ sizeof(char **) *
+ (maxgrp + MAXGRP))) == NULL)
+ return(0);
+ m = members + maxgrp - 1;
+ maxgrp += MAXGRP;
+ }
+ if (*bp == ',') {
+ if (cp) {
+ *bp = '\0';
+ *m++ = cp;
+ cp = NULL;
+ }
+ } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
+ if (cp) {
+ *bp = '\0';
+ *m++ = cp;
+ }
+ break;
+ } else if (cp == NULL)
+ cp = bp;
+
+ }
+ _gr_group.gr_mem = members;
+ *m = NULL;
+ return(1);
+ }
+ /* NOTREACHED */
+ return (0);
+}
+
+#ifdef YP
+
+static int
+_gr_breakout_yp(struct group *gr, char *result)
+{
+ char *s, *cp;
+ char **m;
+
+ /*
+ * XXX If 's' ends up being a NULL pointer, punt on this group.
+ * It means the NIS group entry is badly formatted and should
+ * be skipped.
+ */
+ if ((s = strsep(&result, ":")) == NULL) return 0; /* name */
+ gr->gr_name = s;
+
+ if ((s = strsep(&result, ":")) == NULL) return 0; /* password */
+ gr->gr_passwd = s;
+
+ if ((s = strsep(&result, ":")) == NULL) return 0; /* gid */
+ gr->gr_gid = atoi(s);
+
+ if ((s = result) == NULL) return 0;
+ cp = 0;
+
+ for (m = members; ; s++) {
+ if (m == members + maxgrp - 1) {
+ if ((members = (char **)reallocf(members,
+ sizeof(char **) * (maxgrp + MAXGRP))) == NULL)
+ return(0);
+ m = members + maxgrp - 1;
+ maxgrp += MAXGRP;
+ }
+ if (*s == ',') {
+ if (cp) {
+ *s = '\0';
+ *m++ = cp;
+ cp = NULL;
+ }
+ } else if (*s == '\0' || *s == '\n' || *s == ' ') {
+ if (cp) {
+ *s = '\0';
+ *m++ = cp;
+ }
+ break;
+ } else if (cp == NULL) {
+ cp = s;
+ }
+ }
+ _gr_group.gr_mem = members;
+ *m = NULL;
+
+ return 1;
+}
+
+static char *_gr_yp_domain;
+
+static int
+_getypgroup(struct group *gr, const char *name, char *map)
+{
+ char *result, *s;
+ static char resultbuf[YPMAXRECORD + 2];
+ int resultlen;
+
+ if(!_gr_yp_domain) {
+ if(yp_get_default_domain(&_gr_yp_domain))
+ return 0;
+ }
+
+ if(yp_match(_gr_yp_domain, map, name, strlen(name),
+ &result, &resultlen))
+ return 0;
+
+ s = strchr(result, '\n');
+ if(s) *s = '\0';
+
+ if(resultlen >= sizeof resultbuf) return 0;
+ strncpy(resultbuf, result, resultlen);
+ resultbuf[resultlen] = '\0';
+ free(result);
+ return(_gr_breakout_yp(gr, resultbuf));
+
+}
+
+
+static int
+_nextypgroup(struct group *gr)
+{
+ static char *key;
+ static int keylen;
+ char *lastkey, *result;
+ static char resultbuf[YPMAXRECORD + 2];
+ int resultlen;
+ int rv;
+
+ if(!_gr_yp_domain) {
+ if(yp_get_default_domain(&_gr_yp_domain))
+ return 0;
+ }
+
+ if(!_gr_stepping_yp) {
+ if(key) free(key);
+ rv = yp_first(_gr_yp_domain, "group.byname",
+ &key, &keylen, &result, &resultlen);
+ if(rv) {
+ return 0;
+ }
+ _gr_stepping_yp = 1;
+ goto unpack;
+ } else {
+tryagain:
+ lastkey = key;
+ rv = yp_next(_gr_yp_domain, "group.byname", key, keylen,
+ &key, &keylen, &result, &resultlen);
+ free(lastkey);
+unpack:
+ if(rv) {
+ _gr_stepping_yp = 0;
+ return 0;
+ }
+
+ if(resultlen > sizeof(resultbuf)) {
+ free(result);
+ goto tryagain;
+ }
+
+ strncpy(resultbuf, result, resultlen);
+ resultbuf[resultlen] = '\0';
+ free(result);
+ if((result = strchr(resultbuf, '\n')) != NULL)
+ *result = '\0';
+ if (_gr_breakout_yp(gr, resultbuf))
+ return(1);
+ else
+ goto tryagain;
+ }
+}
+
+#endif /* YP */
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