sbase

suckless unix tools
git clone git://git.2f30.org/sbase.git
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commit dac77d3089f3b5233ca6f0a4c10ebc860c54bf9a
parent 137ebef3aca354e79d259553c3a0756cda0af9cc
Author: sin <sin@2f30.org>
Date:   Sun Dec  1 10:40:14 +0000

Add support to display user and group info for any user

Currently we only handle login names - it should be trivial to
fix to allow for parsing UIDs as well.

Diffstat:
id.1 | 8++++++--
id.c | 49+++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 53 insertions(+), 4 deletions(-)
diff --git a/id.1 b/id.1 @@ -1,8 +1,12 @@ .TH ID 1 sbase\-VERSION .SH NAME id \- print real and effective user and group IDs -.SH DESCRIPTION +.SH SYNOPSIS .B id -Print user and group information for the current user. +.RB [ user ] +.SH DESCRIPTION +Print user and group information of the calling process to standard output. +If a login name is specified, the user and group information of that user +is displayed. .SH SEE ALSO .IR who(1) diff --git a/id.c b/id.c @@ -1,5 +1,6 @@ /* See LICENSE file for copyright and license details. */ #include <sys/types.h> +#include <errno.h> #include <unistd.h> #include <pwd.h> #include <grp.h> @@ -8,28 +9,72 @@ #include <limits.h> #include "util.h" +static void user(struct passwd *pw); static void curproc(void); static void usage(void) { - eprintf("usage: %s\n", argv0); + eprintf("usage: %s [user]\n", argv0); } int main(int argc, char *argv[]) { + struct passwd *pw; + ARGBEGIN { default: usage(); } ARGEND; - curproc(); + switch (argc) { + case 0: + curproc(); + break; + case 1: + errno = 0; + pw = getpwnam(argv[0]); + if (errno != 0) + eprintf("getpwnam %s:", argv[0]); + else if (!pw) + eprintf("getpwnam %s: no such user\n", argv[0]); + user(pw); + break; + default: + usage(); + } return EXIT_SUCCESS; } static void +user(struct passwd *pw) +{ + struct group *gr; + gid_t gid, groups[NGROUPS_MAX]; + int ngroups; + int i; + + printf("uid=%u(%s)", pw->pw_uid, pw->pw_name); + printf(" gid=%u", pw->pw_gid); + if (!(gr = getgrgid(pw->pw_gid))) + eprintf("getgrgid:"); + printf("(%s)", gr->gr_name); + + ngroups = NGROUPS_MAX; + getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); + for (i = 0; i < ngroups; i++) { + gid = groups[i]; + printf("%s%u", !i ? " groups=" : ",", gid); + if (!(gr = getgrgid(gid))) + eprintf("getgrgid:"); + printf("(%s)", gr->gr_name); + } + putchar('\n'); +} + +static void curproc(void) { struct passwd *pw;