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Initial revision

    1: /*
    2:  * Copyright (c) 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: #include <config.h>
   18: 
   19: #include <sys/types.h>
   20: 
   21: #include <stdio.h>
   22: #ifdef STDC_HEADERS
   23: # include <stdlib.h>
   24: # include <stddef.h>
   25: #else
   26: # ifdef HAVE_STDLIB_H
   27: #  include <stdlib.h>
   28: # endif
   29: #endif /* STDC_HEADERS */
   30: #include <grp.h>
   31: 
   32: #define DEFAULT_TEXT_DOMAIN	"sudo"
   33: #include "gettext.h"
   34: 
   35: #include "missing.h"
   36: #include "alloc.h"
   37: #include "fatal.h"
   38: #include "sudo_debug.h"
   39: 
   40: extern id_t atoid(const char *p, const char *sep, char **endp, const char **errstr);
   41: 
   42: /*
   43:  * Parse a comma-separated list of gids into an allocated array of GETGROUPS_T.
   44:  * If a pointer to the base gid is specified, it is stored as the first element
   45:  * in the array.
   46:  * Returns the number of gids in the allocated array.
   47:  * Calls fatalx() on error.
   48:  */
   49: int
   50: parse_gid_list(const char *gidstr, const gid_t *basegid, GETGROUPS_T **gidsp)
   51: {
   52:     int ngids = 0;
   53:     GETGROUPS_T *gids;
   54:     const char *cp = gidstr;
   55:     const char *errstr;
   56:     char *ep;
   57:     debug_decl(atoid, SUDO_DEBUG_UTIL)
   58: 
   59:     /* Count groups. */
   60:     if (*cp != '\0') {
   61: 	ngids++;
   62: 	do {
   63: 	    if (*cp++ == ',')
   64: 		ngids++;
   65: 	} while (*cp != '\0');
   66:     }
   67:     /* Base gid is optional. */
   68:     if (basegid != NULL)
   69: 	ngids++;
   70:     /* Allocate and fill in array. */
   71:     if (ngids != 0) {
   72: 	gids = emalloc2(ngids, sizeof(GETGROUPS_T));
   73: 	ngids = 0;
   74: 	if (basegid != NULL)
   75: 	    gids[ngids++] = *basegid;
   76: 	cp = gidstr;
   77: 	do {
   78: 	    gids[ngids] = (GETGROUPS_T) atoid(cp, ",", &ep, &errstr);
   79: 	    if (errstr != NULL) {
   80: 		warningx(_("%s: %s"), cp, _(errstr));
   81: 		free(gids);
   82: 		debug_return_int(-1);
   83: 	    }
   84: 	    if (basegid == NULL || gids[ngids] != *basegid)
   85: 		ngids++;
   86: 	    cp = ep + 1;
   87: 	} while (*ep != '\0');
   88: 	*gidsp = gids;
   89:     }
   90:     debug_return_int(ngids);
   91: }