diff options
Diffstat (limited to 'usr.bin/id/id.c')
-rw-r--r-- | usr.bin/id/id.c | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/usr.bin/id/id.c b/usr.bin/id/id.c new file mode 100644 index 0000000..a2d6ea6 --- /dev/null +++ b/usr.bin/id/id.c @@ -0,0 +1,351 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1991, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)id.c 8.2 (Berkeley) 2/16/94"; +#endif /* not lint */ + +#include <sys/param.h> + +#include <errno.h> +#include <grp.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +void current __P((void)); +void err __P((const char *, ...)); +void pretty __P((struct passwd *)); +void group __P((struct passwd *, int)); +void usage __P((void)); +void user __P((struct passwd *)); +struct passwd * + who __P((char *)); + +int +main(argc, argv) + int argc; + char *argv[]; +{ + struct group *gr; + struct passwd *pw; + int Gflag, ch, gflag, id, nflag, pflag, rflag, uflag; + + Gflag = gflag = nflag = pflag = rflag = uflag = 0; + while ((ch = getopt(argc, argv, "Ggnpru")) != EOF) + switch(ch) { + case 'G': + Gflag = 1; + break; + case 'g': + gflag = 1; + break; + case 'n': + nflag = 1; + break; + case 'p': + pflag = 1; + break; + case 'r': + rflag = 1; + break; + case 'u': + uflag = 1; + break; + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + switch(Gflag + gflag + pflag + uflag) { + case 1: + break; + case 0: + if (!nflag && !rflag) + break; + /* FALLTHROUGH */ + default: + usage(); + } + + pw = *argv ? who(*argv) : NULL; + + if (gflag) { + id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); + if (nflag && (gr = getgrgid(id))) + (void)printf("%s\n", gr->gr_name); + else + (void)printf("%u\n", id); + exit(0); + } + + if (uflag) { + id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); + if (nflag && (pw = getpwuid(id))) + (void)printf("%s\n", pw->pw_name); + else + (void)printf("%u\n", id); + exit(0); + } + + if (Gflag) { + group(pw, nflag); + exit(0); + } + + if (pflag) { + pretty(pw); + exit(0); + } + + if (pw) + user(pw); + else + current(); + exit(0); +} + +void +pretty(pw) + struct passwd *pw; +{ + struct group *gr; + u_int eid, rid; + char *login; + + if (pw) { + (void)printf("uid\t%s\n", pw->pw_name); + (void)printf("groups\t"); + group(pw, 1); + } else { + if ((login = getlogin()) == NULL) + err("getlogin: %s", strerror(errno)); + + pw = getpwuid(rid = getuid()); + if (pw == NULL || strcmp(login, pw->pw_name)) + (void)printf("login\t%s\n", login); + if (pw) + (void)printf("uid\t%s\n", pw->pw_name); + else + (void)printf("uid\t%u\n", rid); + + if ((eid = geteuid()) != rid) + if (pw = getpwuid(eid)) + (void)printf("euid\t%s", pw->pw_name); + else + (void)printf("euid\t%u", eid); + if ((rid = getgid()) != (eid = getegid())) + if (gr = getgrgid(rid)) + (void)printf("rgid\t%s\n", gr->gr_name); + else + (void)printf("rgid\t%u\n", rid); + (void)printf("groups\t"); + group(NULL, 1); + } +} + +void +current() +{ + struct group *gr; + struct passwd *pw; + int cnt, id, eid, lastid, ngroups; + gid_t groups[NGROUPS]; + char *fmt; + + id = getuid(); + (void)printf("uid=%u", id); + if (pw = getpwuid(id)) + (void)printf("(%s)", pw->pw_name); + if ((eid = geteuid()) != id) { + (void)printf(" euid=%u", eid); + if (pw = getpwuid(eid)) + (void)printf("(%s)", pw->pw_name); + } + id = getgid(); + (void)printf(" gid=%u", id); + if (gr = getgrgid(id)) + (void)printf("(%s)", gr->gr_name); + if ((eid = getegid()) != id) { + (void)printf(" egid=%u", eid); + if (gr = getgrgid(eid)) + (void)printf("(%s)", gr->gr_name); + } + if (ngroups = getgroups(NGROUPS, groups)) { + for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; + fmt = ", %u", lastid = id) { + id = groups[cnt++]; + if (lastid == id) + continue; + (void)printf(fmt, id); + if (gr = getgrgid(id)) + (void)printf("(%s)", gr->gr_name); + } + } + (void)printf("\n"); +} + +void +user(pw) + register struct passwd *pw; +{ + register struct group *gr; + register char *fmt, **p; + int cnt, id, lastid, ngroups, groups[NGROUPS + 1]; + + id = pw->pw_uid; + (void)printf("uid=%u(%s)", id, pw->pw_name); + (void)printf(" gid=%u", pw->pw_gid); + if (gr = getgrgid(id)) + (void)printf("(%s)", gr->gr_name); + ngroups = NGROUPS + 1; + (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); + fmt = " groups=%u"; + for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { + if (lastid == (id = groups[cnt])) + continue; + (void)printf(fmt, id); + fmt = " %u"; + if (gr = getgrgid(id)) + (void)printf("(%s)", gr->gr_name); + lastid = id; + } + (void)printf("\n"); +} + +void +group(pw, nflag) + struct passwd *pw; + int nflag; +{ + struct group *gr; + int cnt, id, lastid, ngroups; + gid_t groups[NGROUPS + 1]; + char *fmt; + + if (pw) { + ngroups = NGROUPS + 1; + (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); + } else { + groups[0] = getgid(); + ngroups = getgroups(NGROUPS, groups + 1) + 1; + } + fmt = nflag ? "%s" : "%u"; + for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { + if (lastid == (id = groups[cnt])) + continue; + if (nflag) { + if (gr = getgrgid(id)) + (void)printf(fmt, gr->gr_name); + else + (void)printf(*fmt == ' ' ? " %u" : "%u", + id); + fmt = " %s"; + } else { + (void)printf(fmt, id); + fmt = " %u"; + } + lastid = id; + } + (void)printf("\n"); +} + +struct passwd * +who(u) + char *u; +{ + struct passwd *pw; + long id; + char *ep; + + /* + * Translate user argument into a pw pointer. First, try to + * get it as specified. If that fails, try it as a number. + */ + if (pw = getpwnam(u)) + return(pw); + id = strtol(u, &ep, 10); + if (*u && !*ep && (pw = getpwuid(id))) + return(pw); + err("%s: No such user", u); + /* NOTREACHED */ +} + +#if __STDC__ +#include <stdarg.h> +#else +#include <varargs.h> +#endif + +void +#if __STDC__ +err(const char *fmt, ...) +#else +err(fmt, va_alist) + char *fmt; + va_dcl +#endif +{ + va_list ap; +#if __STDC__ + va_start(ap, fmt); +#else + va_start(ap); +#endif + (void)fprintf(stderr, "id: "); + (void)vfprintf(stderr, fmt, ap); + va_end(ap); + (void)fprintf(stderr, "\n"); + exit(1); + /* NOTREACHED */ +} + +void +usage() +{ + (void)fprintf(stderr, "usage: id [user]\n"); + (void)fprintf(stderr, " id -G [-n] [user]\n"); + (void)fprintf(stderr, " id -g [-nr] [user]\n"); + (void)fprintf(stderr, " id -u [-nr] [user]\n"); + exit(1); +} |