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Diffstat (limited to 'libmisc/addgrps.c')
| -rw-r--r-- | libmisc/addgrps.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/libmisc/addgrps.c b/libmisc/addgrps.c new file mode 100644 index 0000000..40fad99 --- /dev/null +++ b/libmisc/addgrps.c @@ -0,0 +1,131 @@ +/* + * Copyright (c) 1989 - 1994, Julianne Frances Haugh + * Copyright (c) 1996 - 1998, Marek Michałkiewicz + * Copyright (c) 2001 - 2006, Tomasz Kłoczko + * Copyright (c) 2007 - 2009, Nicolas François + * 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. + * 3. The name of the copyright holders or contributors may not be used to + * endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT + * HOLDERS 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. + */ + +#include <config.h> + +#if defined (HAVE_SETGROUPS) && ! defined (USE_PAM) + +#include "prototypes.h" +#include "defines.h" + +#include <stdio.h> +#include <grp.h> +#include <errno.h> + +#ident "$Id$" + +#define SEP ",:" +/* + * Add groups with names from LIST (separated by commas or colons) + * to the supplementary group set. Silently ignore groups which are + * already there. Warning: uses strtok(). + */ +int add_groups (const char *list) +{ + GETGROUPS_T *grouplist, *tmp; + size_t i; + int ngroups; + bool added; + char *token; + char buf[1024]; + + if (strlen (list) >= sizeof (buf)) { + errno = EINVAL; + return -1; + } + strcpy (buf, list); + + i = 16; + for (;;) { + grouplist = (gid_t *) malloc (i * sizeof (GETGROUPS_T)); + if (NULL == grouplist) { + return -1; + } + ngroups = getgroups (i, grouplist); + if ( ( (-1 == ngroups) + && (EINVAL != errno)) + || (i > (size_t)ngroups)) { + /* Unexpected failure of getgroups or successful + * reception of the groups */ + break; + } + /* not enough room, so try allocating a larger buffer */ + free (grouplist); + i *= 2; + } + if (ngroups < 0) { + free (grouplist); + return -1; + } + + added = false; + for (token = strtok (buf, SEP); NULL != token; token = strtok (NULL, SEP)) { + struct group *grp; + + grp = getgrnam (token); /* local, no need for xgetgrnam */ + if (NULL == grp) { + fprintf (stderr, _("Warning: unknown group %s\n"), + token); + continue; + } + + for (i = 0; i < (size_t)ngroups && grouplist[i] != grp->gr_gid; i++); + + if (i < (size_t)ngroups) { + continue; + } + + if (ngroups >= sysconf (_SC_NGROUPS_MAX)) { + fputs (_("Warning: too many groups\n"), stderr); + break; + } + tmp = (gid_t *) realloc (grouplist, (size_t)(ngroups + 1) * sizeof (GETGROUPS_T)); + if (NULL == tmp) { + free (grouplist); + return -1; + } + tmp[ngroups] = grp->gr_gid; + ngroups++; + grouplist = tmp; + added = true; + } + + if (added) { + return setgroups ((size_t)ngroups, grouplist); + } + + return 0; +} +#else /* HAVE_SETGROUPS && !USE_PAM */ +extern int errno; /* warning: ANSI C forbids an empty source file */ +#endif /* HAVE_SETGROUPS && !USE_PAM */ + |