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    1: /*
    2:  * Copyright (c) 2010 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: #include <stdio.h>
   21: #ifdef STDC_HEADERS
   22: # include <stdlib.h>
   23: # include <stddef.h>
   24: #else
   25: # ifdef HAVE_STDLIB_H
   26: #  include <stdlib.h>
   27: # endif
   28: #endif /* STDC_HEADERS */
   29: #ifdef HAVE_STRING_H
   30: # include <string.h>
   31: #endif /* HAVE_STRING_H */
   32: #ifdef HAVE_STRINGS_H
   33: # include <strings.h>
   34: #endif /* HAVE_STRINGS_H */
   35: #include <grp.h>
   36: 
   37: #include "missing.h"
   38: 
   39: #ifdef HAVE_GETGRSET
   40: /*
   41:  * BSD-compatible getgrouplist(3) using getgrset(3)
   42:  */
   43: int
   44: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
   45: {
   46:     char *cp, *grset = NULL;
   47:     int i, ngroups = 1;
   48:     int grpsize = *ngroupsp;
   49:     int rval = -1;
   50:     gid_t gid;
   51: 
   52:     /* We support BSD semantics where the first element is the base gid */
   53:     if (grpsize <= 0)
   54: 	return -1;
   55:     groups[0] = basegid;
   56: 
   57: #ifdef HAVE_SETAUTHDB
   58:     aix_setauthdb((char *) name);
   59: #endif
   60:     if ((grset = getgrset(name)) != NULL) {
   61: 	for (cp = strtok(grset, ","); cp != NULL; cp = strtok(NULL, ",")) {
   62: 	    gid = atoi(cp);
   63: 	    if (gid != basegid) {
   64: 		if (ngroups == grpsize)
   65: 		    goto done;
   66: 		groups[ngroups++] = gid;
   67: 	    }
   68: 	}
   69:     }
   70:     rval = 0;
   71: 
   72: done:
   73:     efree(grset);
   74: #ifdef HAVE_SETAUTHDB
   75:     aix_restoreauthdb();
   76: #endif
   77:     *ngroupsp = ngroups;
   78: 
   79:     return rval;
   80: }
   81: 
   82: #else /* HAVE_GETGRSET */
   83: 
   84: /*
   85:  * BSD-compatible getgrouplist(3) using getgrent(3)
   86:  */
   87: int
   88: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
   89: {
   90:     int i, ngroups = 1;
   91:     int grpsize = *ngroupsp;
   92:     int rval = -1;
   93:     struct group *grp;
   94: 
   95:     /* We support BSD semantics where the first element is the base gid */
   96:     if (grpsize <= 0)
   97: 	return -1;
   98:     groups[0] = basegid;
   99: 
  100:     setgrent();
  101:     while ((grp = getgrent()) != NULL) {
  102: 	if (grp->gr_gid == basegid)
  103: 	    continue;
  104: 
  105: 	for (i = 0; grp->gr_mem[i] != NULL; i++) {
  106: 	    if (strcmp(name, grp->gr_mem[i]) == 0)
  107: 		break;
  108: 	}
  109: 	if (grp->gr_mem[i] == NULL)
  110: 	    continue; /* user not found */
  111: 
  112: 	/* Only add if it is not the same as an existing gid */
  113: 	for (i = 0; i < ngroups; i++) {
  114: 	    if (grp->gr_gid == groups[i])
  115: 		break;
  116: 	}
  117: 	if (i == ngroups) {
  118: 	    if (ngroups == grpsize)
  119: 		goto done;
  120: 	    groups[ngroups++] = grp->gr_gid;
  121: 	}
  122:     }
  123:     rval = 0;
  124: 
  125: done:
  126:     endgrent();
  127:     *ngroupsp = ngroups;
  128: 
  129:     return rval;
  130: }
  131: #endif /* HAVE_GETGRSET */