/*- * Copyright (C) 1996 * David L. Nugent. 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. * * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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. * * $Id: edgroup.c,v 1.1.1.2 1996/12/10 23:58:54 joerg Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pwupd.h" static int isingroup(char const * name, char **mem) { int i; for (i = 0; mem[i] != NULL; i++) if (strcmp(name, mem[i]) == 0) return i; return -1; } static char groupfile[] = _PATH_GROUP; static char grouptmp[] = _PATH_GROUP ".new"; int editgroups(char *name, char **groups) { int rc = 0; int infd; if ((infd = open(groupfile, O_RDWR | O_CREAT | O_EXLOCK, 0644)) != -1) { FILE *infp; if ((infp = fdopen(infd, "r+")) == NULL) close(infd); else { int outfd; if ((outfd = open(grouptmp, O_RDWR | O_CREAT | O_TRUNC | O_EXLOCK, 0644)) != -1) { FILE *outfp; if ((outfp = fdopen(outfd, "w+")) == NULL) close(outfd); else { int linelen = PWBUFSZ; int outlen = PWBUFSZ; int memlen = 200; /* Arbitrary */ char *line = malloc(linelen); char *outl = malloc(outlen); char **mems = malloc(memlen * sizeof(char *)); int namlen = strlen(name); if (line == NULL || outl == NULL || mems == NULL) { mem_abort: rc = 0; } else { while (fgets(line, linelen, infp) != NULL) { char *p; int l; while ((p = strchr(line, '\n')) == NULL) { if (extendline(&line, &linelen, linelen + PWBUFSZ) == -1) { goto mem_abort; } l = strlen(line); if (fgets(line + l, linelen - l, infp) == NULL) break; /* No newline terminator on last line */ } l = strlen(line) + namlen + 1; if (extendline(&outl, &outlen, l) == -1) { goto mem_abort; } if (*line == '#') strcpy(outl, line); else if (*line == '\n') *outl = '\0'; else { int i, mno = 0; char *cp = line; char const *sep = ":\n"; struct group grp; memset(&grp, 0, sizeof grp); for (i = 0; (p = strsep(&cp, sep)) != NULL; i++) { switch (i) { case 0: /* Group name */ grp.gr_name = p; break; case 1: /* Group password */ grp.gr_passwd = p; break; case 2: /* Group id */ grp.gr_gid = atoi(p); break; case 3: /* Member list */ cp = p; sep = ",\n"; break; default: /* Individual members */ if (*p) { if (extendarray(&mems, &memlen, mno + 2) == -1) { goto mem_abort; } mems[mno++] = p; } break; } } if (i < 2) /* Bail out - insufficient fields */ continue; grp.gr_mem = mems; for (i = mno; i < memlen; i++) mems[i] = NULL; /* * Delete from group, or add to group? */ if (groups == NULL || isingroup(grp.gr_name, groups) == -1) { /* Delete */ int idx; while ((idx = isingroup(name, mems)) != -1) { for (i = idx; i < (memlen - 1); i++) mems[i] = mems[i + 1]; mems[i] = NULL; --mno; } /* * Special case - deleting user and group may be user's own */ if (groups == NULL && mems[0] == NULL && strcmp(name, grp.gr_name) == 0) { /* * First, make _sure_ we don't have other members */ struct passwd *pwd; setpwent(); while ((pwd = getpwent()) != NULL && pwd->pw_gid != grp.gr_gid); endpwent(); if (pwd == NULL) /* No members at all */ continue; /* Drop the group */ } } else if (isingroup(name, mems) == -1) { if (extendarray(&mems, &memlen, mno + 2) == -1) { goto mem_abort; } grp.gr_mem = mems; /* May have realloced() */ mems[mno++] = name; mems[mno ] = NULL; } fmtgrentry(&outl, &outlen, &grp, PWF_GROUP); } fputs(outl, outfp); } if (fflush(outfp) != EOF) { rc = 1; /* * Copy data back into the original file and truncate */ rewind(infp); rewind(outfp); while (fgets(outl, outlen, outfp) != NULL) fputs(outl, infp); /* * This is a gross hack, but we may have corrupted the * original file. Unfortunately, it will lose preservation * of the inode. */ if (fflush(infp) == EOF || ferror(infp)) rc = rename(grouptmp, groupfile) == 0; else ftruncate(infd, ftell(infp)); } } free(mems); free(outl); free(line); fclose(outfp); } remove(grouptmp); } fclose(infp); } } return rc; }