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