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/* $Id: uid.c,v 1.3 1993/10/28 16:49:51 chip Exp $
*
* I wish the System V "id" program were universally available; but it
* isn't, so I've written this replacement.
*
* usage: uid [-options]
*
* Default action is to print one line in the manner of "id":
* uid=201(chip) gid=50(group) euid=0(root) egid=0(root) [groups=1(x),2(y)]
* (Note that the "euid" and "egid" entries are not output if they are
* the same as the "uid" and "gid" values, and that the "groups" entry
* not output if there are no supplemental groups.)
*
* If an option string is specified, it disables the normal behavior in
* favor of displaying id information, one per line, in the order that
* the options appear in the option string. Legal options are:
* u real uid
* g real gid
* U effective uid
* G effective gid
* S supplemental groups
*
* NOTE: This program is not a paragon of good style.
* It's just something I needed for a Makefile.
*
* $Log: uid.c,v $
* Revision 1.3 1993/10/28 16:49:51 chip
* Declare function return types, including void.
*
* Revision 1.2 1991/06/04 18:16:28 chip
* Feature-based configuration.
*
* Revision 1.1 91/05/13 18:36:55 chip
* Initial revision
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include "config.h"
#include "misc.h"
#undef NULL
#define NULL 0
extern struct passwd *getpwuid();
extern struct group *getgrgid();
char *progname = "uid";
char *uid_desc();
char *gid_desc();
int
main(argc, argv)
int argc;
char **argv;
{
int uid, gid, euid, egid;
int c, lines, errcount;
#ifdef GROUP_VECTOR
GRVEC_T *groups;
int maxgroups, ngroups, g;
#endif
uid = getuid();
gid = getgid();
euid = geteuid();
egid = getegid();
#ifdef GROUP_VECTOR
if ((maxgroups = MAXGROUPS()) == -1)
maxgroups = 0;
if (maxgroups <= 0)
{
groups = NULL;
ngroups = 0;
}
else
{
if ((groups = (GRVEC_T *) malloc(sizeof(GRVEC_T) * maxgroups)) == NULL)
{
fprintf(stderr, "uid: out of memory?!\n");
exit(1);
}
ngroups = GETGROUPS(maxgroups, groups);
}
#endif /* GROUP_VECTOR */
errcount = 0;
lines = 0;
while ((c = getopt(argc, argv, "ugUGS")) != EOF)
{
switch (c)
{
case 'u':
(void) printf("%s\n", uid_desc(uid));
++lines;
break;
case 'g':
(void) printf("%s\n", gid_desc(gid));
++lines;
break;
case 'U':
(void) printf("%s\n", uid_desc(euid));
++lines;
break;
case 'G':
(void) printf("%s\n", gid_desc(egid));
++lines;
break;
case 'S':
#ifdef GROUP_VECTOR
for (g = 0; g < ngroups; ++g)
{
if (g)
(void) putchar(',');
(void) printf("%s", gid_desc(groups[g]));
}
if (ngroups)
(void) putchar('\n');
#endif /* GROUP_VECTOR */
++lines;
break;
case '?':
++errcount;
break;
}
}
if (errcount)
{
(void) fprintf(stderr, "usage: uid [-ugUGS]\n");
exit(1);
}
if (lines == 0)
{
(void) printf("uid=%s", uid_desc(uid));
(void) printf(" gid=%s", gid_desc(gid));
if (euid != uid)
(void) printf(" euid=%s", uid_desc(euid));
if (egid != gid)
(void) printf(" egid=%s", gid_desc(egid));
#ifdef GROUP_VECTOR
if (ngroups)
{
(void) printf(" groups=");
for (g = 0; g < ngroups; ++g)
{
if (g)
(void) putchar(',');
(void) printf("%s", gid_desc(groups[g]));
}
}
#endif /* GROUP_VECTOR */
(void) printf("\n");
}
exit(0);
/* NOTREACHED */
}
char *
uid_desc(uid)
int uid;
{
struct passwd *pw;
static char buf[80];
(void) sprintf(buf, "%d", uid);
if ((pw = getpwuid(uid)) != NULL)
(void) sprintf(buf + strlen(buf), "(%s)", pw->pw_name);
return buf;
}
char *
gid_desc(gid)
int gid;
{
struct group *gr;
static char buf[80];
(void) sprintf(buf, "%d", gid);
if ((gr = getgrgid(gid)) != NULL)
(void) sprintf(buf + strlen(buf), "(%s)", gr->gr_name);
return buf;
}
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