[9] | 1 | /* id - return uid and gid Author: John J. Marco */
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| 2 |
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| 3 | /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
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| 4 | /* ----- id.c ----- */
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| 5 | /* Id - get real and effective user id and group id */
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| 6 | /* Author: John J. Marco */
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| 7 | /* pa1343@sdcc15.ucsd.edu */
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| 8 | /*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
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| 9 |
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| 10 | #include <sys/types.h>
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| 11 | #include <pwd.h>
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| 12 | #include <grp.h>
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| 13 | #include <unistd.h>
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| 14 | #include <stdio.h>
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| 15 | #include <limits.h>
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| 16 |
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| 17 | int main(int argc, char *argv[])
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| 18 | {
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| 19 | struct passwd *pwd;
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| 20 | struct group *grp;
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| 21 | uid_t ruid, euid;
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| 22 | gid_t rgid, egid;
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| 23 | #if __minix_vmd
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| 24 | uid_t suid;
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| 25 | gid_t sgid;
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| 26 | #else
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| 27 | # define suid ruid
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| 28 | # define sgid rgid
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| 29 | #endif
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| 30 | #if NGROUPS_MAX > 0
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| 31 | gid_t groups[NGROUPS_MAX];
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| 32 | int ngroups;
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| 33 | #else
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| 34 | # define groups (&rgid)
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| 35 | # define ngroups 0
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| 36 | #endif
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| 37 | int g;
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| 38 | int isug;
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| 39 | int c, uopt = 0;
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| 40 |
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| 41 | #if __minix_vmd
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| 42 | get6id(&ruid, &euid, &suid, &rgid, &egid, &sgid);
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| 43 | isug = issetugid();
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| 44 | #else
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| 45 | ruid = getuid();
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| 46 | euid = geteuid();
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| 47 | rgid = getgid();
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| 48 | egid = getegid();
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| 49 | isug = 0;
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| 50 | #endif
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| 51 | #if NGROUPS_MAX > 0
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| 52 | ngroups = getgroups(NGROUPS_MAX, groups);
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| 53 | #endif
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| 54 |
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| 55 | while((c = getopt(argc, argv, "u")) != EOF) {
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| 56 | switch(c) {
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| 57 | case 'u':
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| 58 | uopt = 1;
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| 59 | break;
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| 60 | default:
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| 61 | fprintf(stderr, "%s: unrecognized option\n", argv[0]);
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| 62 | return(1);
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| 63 | }
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| 64 | }
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| 65 |
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| 66 | if(uopt) {
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| 67 | printf("%d\n", euid);
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| 68 | return 0;
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| 69 | }
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| 70 |
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| 71 | if ((pwd = getpwuid(ruid)) == NULL)
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| 72 | printf("uid=%d", ruid);
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| 73 | else
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| 74 | printf("uid=%d(%s)", ruid, pwd->pw_name);
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| 75 |
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| 76 | if ((grp = getgrgid(rgid)) == NULL)
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| 77 | printf(" gid=%d", rgid);
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| 78 | else
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| 79 | printf(" gid=%d(%s)", rgid, grp->gr_name);
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| 80 |
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| 81 | if (euid != ruid)
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| 82 | if ((pwd = getpwuid(euid)) != NULL)
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| 83 | printf(" euid=%d(%s)", euid, pwd->pw_name);
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| 84 | else
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| 85 | printf(" euid=%d", euid);
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| 86 |
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| 87 | if (egid != rgid)
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| 88 | if ((grp = getgrgid(egid)) != NULL)
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| 89 | printf(" egid=%d(%s)", egid, grp->gr_name);
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| 90 | else
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| 91 | printf(" egid=%d", egid);
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| 92 |
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| 93 | if (suid != euid)
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| 94 | if ((pwd = getpwuid(suid)) != NULL)
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| 95 | printf(" suid=%d(%s)", suid, pwd->pw_name);
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| 96 | else
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| 97 | printf(" suid=%d", suid);
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| 98 |
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| 99 | if (sgid != egid)
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| 100 | if ((grp = getgrgid(sgid)) != NULL)
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| 101 | printf(" sgid=%d(%s)", sgid, grp->gr_name);
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| 102 | else
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| 103 | printf(" sgid=%d", sgid);
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| 104 |
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| 105 | if (isug) {
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| 106 | printf(" issetugid");
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| 107 | }
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| 108 |
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| 109 | if (ngroups > 0) {
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| 110 | printf(" groups=");
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| 111 | for (g = 0; g < ngroups; g++) {
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| 112 | if (g > 0) fputc(',', stdout);
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| 113 | if ((grp = getgrgid(groups[g])) == NULL)
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| 114 | printf("%d", groups[g]);
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| 115 | else
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| 116 | printf("%d(%s)", groups[g], grp->gr_name);
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | printf("\n");
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| 121 | return(0);
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| 122 | }
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