123 lines
2.4 KiB
C
Executable File
123 lines
2.4 KiB
C
Executable File
/* id - return uid and gid Author: John J. Marco */
|
|
|
|
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
|
|
/* ----- id.c ----- */
|
|
/* Id - get real and effective user id and group id */
|
|
/* Author: John J. Marco */
|
|
/* pa1343@sdcc15.ucsd.edu */
|
|
/*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
|
|
|
|
#include <sys/types.h>
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <limits.h>
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct passwd *pwd;
|
|
struct group *grp;
|
|
uid_t ruid, euid;
|
|
gid_t rgid, egid;
|
|
#if __minix_vmd
|
|
uid_t suid;
|
|
gid_t sgid;
|
|
#else
|
|
# define suid ruid
|
|
# define sgid rgid
|
|
#endif
|
|
#if NGROUPS_MAX > 0
|
|
gid_t groups[NGROUPS_MAX];
|
|
int ngroups;
|
|
#else
|
|
# define groups (&rgid)
|
|
# define ngroups 0
|
|
#endif
|
|
int g;
|
|
int isug;
|
|
int c, uopt = 0;
|
|
|
|
#if __minix_vmd
|
|
get6id(&ruid, &euid, &suid, &rgid, &egid, &sgid);
|
|
isug = issetugid();
|
|
#else
|
|
ruid = getuid();
|
|
euid = geteuid();
|
|
rgid = getgid();
|
|
egid = getegid();
|
|
isug = 0;
|
|
#endif
|
|
#if NGROUPS_MAX > 0
|
|
ngroups = getgroups(NGROUPS_MAX, groups);
|
|
#endif
|
|
|
|
while((c = getopt(argc, argv, "u")) != EOF) {
|
|
switch(c) {
|
|
case 'u':
|
|
uopt = 1;
|
|
break;
|
|
default:
|
|
fprintf(stderr, "%s: unrecognized option\n", argv[0]);
|
|
return(1);
|
|
}
|
|
}
|
|
|
|
if(uopt) {
|
|
printf("%d\n", euid);
|
|
return 0;
|
|
}
|
|
|
|
if ((pwd = getpwuid(ruid)) == NULL)
|
|
printf("uid=%d", ruid);
|
|
else
|
|
printf("uid=%d(%s)", ruid, pwd->pw_name);
|
|
|
|
if ((grp = getgrgid(rgid)) == NULL)
|
|
printf(" gid=%d", rgid);
|
|
else
|
|
printf(" gid=%d(%s)", rgid, grp->gr_name);
|
|
|
|
if (euid != ruid)
|
|
if ((pwd = getpwuid(euid)) != NULL)
|
|
printf(" euid=%d(%s)", euid, pwd->pw_name);
|
|
else
|
|
printf(" euid=%d", euid);
|
|
|
|
if (egid != rgid)
|
|
if ((grp = getgrgid(egid)) != NULL)
|
|
printf(" egid=%d(%s)", egid, grp->gr_name);
|
|
else
|
|
printf(" egid=%d", egid);
|
|
|
|
if (suid != euid)
|
|
if ((pwd = getpwuid(suid)) != NULL)
|
|
printf(" suid=%d(%s)", suid, pwd->pw_name);
|
|
else
|
|
printf(" suid=%d", suid);
|
|
|
|
if (sgid != egid)
|
|
if ((grp = getgrgid(sgid)) != NULL)
|
|
printf(" sgid=%d(%s)", sgid, grp->gr_name);
|
|
else
|
|
printf(" sgid=%d", sgid);
|
|
|
|
if (isug) {
|
|
printf(" issetugid");
|
|
}
|
|
|
|
if (ngroups > 0) {
|
|
printf(" groups=");
|
|
for (g = 0; g < ngroups; g++) {
|
|
if (g > 0) fputc(',', stdout);
|
|
if ((grp = getgrgid(groups[g])) == NULL)
|
|
printf("%d", groups[g]);
|
|
else
|
|
printf("%d(%s)", groups[g], grp->gr_name);
|
|
}
|
|
}
|
|
|
|
printf("\n");
|
|
return(0);
|
|
}
|