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Annotation of embedaddon/sudo/plugins/group_file/getgrent.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2005,2008,2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16: 
        !            17: /*
        !            18:  * Trivial replacements for the libc getgr{uid,nam}() routines.
        !            19:  */
        !            20: 
        !            21: #include <config.h>
        !            22: 
        !            23: #include <sys/types.h>
        !            24: #include <stdio.h>
        !            25: #ifdef STDC_HEADERS
        !            26: # include <stdlib.h>
        !            27: # include <stddef.h>
        !            28: #else
        !            29: # ifdef HAVE_STDLIB_H
        !            30: #  include <stdlib.h>
        !            31: # endif
        !            32: #endif /* STDC_HEADERS */
        !            33: #ifdef HAVE_STRING_H
        !            34: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
        !            35: #  include <memory.h>
        !            36: # endif
        !            37: # include <string.h>
        !            38: #endif /* HAVE_STRING_H */
        !            39: #ifdef HAVE_STRINGS_H
        !            40: # include <strings.h>
        !            41: #endif /* HAVE_STRINGS_H */
        !            42: #include <fcntl.h>
        !            43: #include <limits.h>
        !            44: #include <pwd.h>
        !            45: #include <grp.h>
        !            46: 
        !            47: #include "missing.h"
        !            48: 
        !            49: #ifndef LINE_MAX
        !            50: # define LINE_MAX 2048
        !            51: #endif
        !            52: 
        !            53: #undef GRMEM_MAX
        !            54: #define GRMEM_MAX 200
        !            55: 
        !            56: static FILE *grf;
        !            57: static const char *grfile = "/etc/group";
        !            58: static int gr_stayopen;
        !            59: 
        !            60: void mysetgrfile(const char *);
        !            61: void mysetgrent(void);
        !            62: void myendgrent(void);
        !            63: struct group *mygetgrent(void);
        !            64: struct group *mygetgrnam(const char *);
        !            65: struct group *mygetgrgid(gid_t);
        !            66: 
        !            67: void
        !            68: mysetgrfile(const char *file)
        !            69: {
        !            70:     grfile = file;
        !            71:     if (grf != NULL)
        !            72:        myendgrent();
        !            73: }
        !            74: 
        !            75: void
        !            76: mysetgrent(void)
        !            77: {
        !            78:     if (grf == NULL) {
        !            79:        grf = fopen(grfile, "r");
        !            80:        if (grf != NULL)
        !            81:            fcntl(fileno(grf), F_SETFD, FD_CLOEXEC);
        !            82:     } else {
        !            83:        rewind(grf);
        !            84:     }
        !            85:     gr_stayopen = 1;
        !            86: }
        !            87: 
        !            88: void
        !            89: myendgrent(void)
        !            90: {
        !            91:     if (grf != NULL) {
        !            92:        fclose(grf);
        !            93:        grf = NULL;
        !            94:     }
        !            95:     gr_stayopen = 0;
        !            96: }
        !            97: 
        !            98: struct group *
        !            99: mygetgrent(void)
        !           100: {
        !           101:     static struct group gr;
        !           102:     static char grbuf[LINE_MAX], *gr_mem[GRMEM_MAX+1];
        !           103:     size_t len;
        !           104:     char *cp, *colon;
        !           105:     int n;
        !           106: 
        !           107:     if ((colon = fgets(grbuf, sizeof(grbuf), grf)) == NULL)
        !           108:        return NULL;
        !           109: 
        !           110:     memset(&gr, 0, sizeof(gr));
        !           111:     if ((colon = strchr(cp = colon, ':')) == NULL)
        !           112:        return NULL;
        !           113:     *colon++ = '\0';
        !           114:     gr.gr_name = cp;
        !           115:     if ((colon = strchr(cp = colon, ':')) == NULL)
        !           116:        return NULL;
        !           117:     *colon++ = '\0';
        !           118:     gr.gr_passwd = cp;
        !           119:     if ((colon = strchr(cp = colon, ':')) == NULL)
        !           120:        return NULL;
        !           121:     *colon++ = '\0';
        !           122:     gr.gr_gid = atoi(cp);
        !           123:     len = strlen(colon);
        !           124:     if (len > 0 && colon[len - 1] == '\n')
        !           125:        colon[len - 1] = '\0';
        !           126:     if (*colon != '\0') {
        !           127:        gr.gr_mem = gr_mem;
        !           128:        cp = strtok(colon, ",");
        !           129:        for (n = 0; cp != NULL && n < GRMEM_MAX; n++) {
        !           130:            gr.gr_mem[n] = cp;
        !           131:            cp = strtok(NULL, ",");
        !           132:        }
        !           133:        gr.gr_mem[n++] = NULL;
        !           134:     } else
        !           135:        gr.gr_mem = NULL;
        !           136:     return &gr;
        !           137: }
        !           138: 
        !           139: struct group *
        !           140: mygetgrnam(const char *name)
        !           141: {
        !           142:     struct group *gr;
        !           143: 
        !           144:     if (grf == NULL) {
        !           145:        if ((grf = fopen(grfile, "r")) == NULL)
        !           146:            return NULL;
        !           147:        fcntl(fileno(grf), F_SETFD, FD_CLOEXEC);
        !           148:     } else {
        !           149:        rewind(grf);
        !           150:     }
        !           151:     while ((gr = mygetgrent()) != NULL) {
        !           152:        if (strcmp(gr->gr_name, name) == 0)
        !           153:            break;
        !           154:     }
        !           155:     if (!gr_stayopen) {
        !           156:        fclose(grf);
        !           157:        grf = NULL;
        !           158:     }
        !           159:     return gr;
        !           160: }
        !           161: 
        !           162: struct group *
        !           163: mygetgrgid(gid_t gid)
        !           164: {
        !           165:     struct group *gr;
        !           166: 
        !           167:     if (grf == NULL) {
        !           168:        if ((grf = fopen(grfile, "r")) == NULL)
        !           169:            return NULL;
        !           170:        fcntl(fileno(grf), F_SETFD, FD_CLOEXEC);
        !           171:     } else {
        !           172:        rewind(grf);
        !           173:     }
        !           174:     while ((gr = mygetgrent()) != NULL) {
        !           175:        if (gr->gr_gid == gid)
        !           176:            break;
        !           177:     }
        !           178:     if (!gr_stayopen) {
        !           179:        fclose(grf);
        !           180:        grf = NULL;
        !           181:     }
        !           182:     return gr;
        !           183: }