3 * David L. Nugent. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 static const char rcsid[] =
37 #include <sys/types.h>
42 #include <sys/param.h>
48 isingroup(char const * name, char **mem)
52 for (i = 0; mem[i] != NULL; i++)
53 if (strcmp(name, mem[i]) == 0)
59 editgroups(char *name, char **groups)
63 char groupfile[MAXPATHLEN];
64 char grouptmp[MAXPATHLEN];
66 strncpy(groupfile, getgrpath(_GROUP), MAXPATHLEN - 5);
67 groupfile[MAXPATHLEN - 5] = '\0';
68 strcpy(grouptmp, groupfile);
69 strcat(grouptmp, ".new");
71 if ((infd = open(groupfile, O_RDWR | O_CREAT | O_EXLOCK, 0644)) != -1) {
74 if ((infp = fdopen(infd, "r+")) == NULL)
79 if ((outfd = open(grouptmp, O_RDWR | O_CREAT | O_TRUNC, 0644)) != -1) {
82 if ((outfp = fdopen(outfd, "w+")) == NULL)
85 int linelen = PWBUFSZ;
87 int memlen = 200; /* Arbitrary */
88 char *line = malloc(linelen);
89 char *outl = malloc(outlen);
90 char **mems = malloc(memlen * sizeof(char *));
91 int namlen = strlen(name);
93 if (line == NULL || outl == NULL || mems == NULL) {
97 while (fgets(line, linelen, infp) != NULL) {
101 while ((p = strchr(line, '\n')) == NULL)
103 if (extendline(&line, &linelen, linelen + PWBUFSZ) == -1) {
107 if (fgets(line + l, linelen - l, infp) == NULL)
108 break; /* No newline terminator on last line */
110 l = strlen(line) + namlen + 1;
111 if (extendline(&outl, &outlen, l) == -1) {
116 else if (*line == '\n')
122 char const *sep = ":\n";
125 memset(&grp, 0, sizeof grp);
126 for (i = 0; (p = strsep(&cp, sep)) != NULL; i++) {
128 case 0: /* Group name */
131 case 1: /* Group password */
134 case 2: /* Group id */
135 grp.gr_gid = atoi(p);
137 case 3: /* Member list */
141 default: /* Individual members */
143 if (extendarray(&mems, &memlen, mno + 2) == -1) {
151 if (i < 2) /* Bail out - insufficient fields */
155 for (i = mno; i < memlen; i++)
159 * Delete from group, or add to group?
161 if (groups == NULL || isingroup(grp.gr_name, groups) == -1) { /* Delete */
164 while ((idx = isingroup(name, mems)) != -1) {
165 for (i = idx; i < (memlen - 1); i++)
166 mems[i] = mems[i + 1];
171 * Special case - deleting user and group may be user's own
173 if (groups == NULL && mems[0] == NULL && strcmp(name, grp.gr_name) == 0) {
175 * First, make _sure_ we don't have other members
180 while ((pwd = GETPWENT()) != NULL && (gid_t)pwd->pw_gid != (gid_t)grp.gr_gid);
182 if (pwd == NULL) /* No members at all */
183 continue; /* Drop the group */
185 } else if (isingroup(name, mems) == -1) {
186 if (extendarray(&mems, &memlen, mno + 2) == -1) {
189 grp.gr_mem = mems; /* May have realloced() */
193 fmtgrentry(&outl, &outlen, &grp, PWF_GROUP);
197 if (fflush(outfp) != EOF) {
201 * Copy data back into the original file and truncate
205 while (fgets(outl, outlen, outfp) != NULL)
209 * This is a gross hack, but we may have corrupted the
212 if (fflush(infp) == EOF || ferror(infp))
213 rc = rename(grouptmp, groupfile) == 0;
215 ftruncate(infd, ftell(infp));