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Annotation of embedaddon/sudo/plugins/group_file/getgrent.c, revision 1.1.1.1

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: }