53 lines
1.3 KiB
C
53 lines
1.3 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 <stdio.h>
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main()
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{
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struct passwd *pwd;
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struct passwd *getpwuid();
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struct group *grp;
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struct group *getgrgid();
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int uid, gid, euid, egid;
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uid = getuid();
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gid = getgid();
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euid = geteuid();
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egid = getegid();
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if ((pwd = getpwuid(uid)) == (struct passwd *) NULL)
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printf("%s%d%s", "uid=", uid, " ");
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else
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printf("%s%d%s%s%s", "uid=", uid, "(", pwd->pw_name, ") ");
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if ((grp = getgrgid(gid)) == (struct group *) NULL)
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printf("%s%d%s", "gid=", gid, " ");
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else
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printf("%s%d%s%s%s", "gid=", gid, "(", grp->gr_name, ") ");
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if (uid != euid)
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if ((pwd = getpwuid(euid)) != (struct passwd *) NULL)
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printf("%s%d%s%s%s", "euid=", euid, "(", pwd->pw_name, ") ");
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else
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printf("%s%d%s", "euid=", euid, " ");
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if (gid != egid)
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if ((grp = getgrgid(egid)) != (struct group *) NULL)
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printf("%s%d%s%s%s", "egid=", egid, "(", grp->gr_name, ") ");
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else
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printf("%s%d%s", "egid=", egid, " ");
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printf("\n");
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}
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