48 lines
902 B
C
48 lines
902 B
C
/**
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* chkgrp-min is a program that checks if a user is a member of a group.
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*
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* Author: Johannes Findeisen <you@hanez.org> - 2025
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* Homepage: https://git.xw3.org/hanez/chkgrp
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* License: Apache-2.0 (see LICENSE)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pwd.h>
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#include <grp.h>
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#define MAX_NAME 256
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int main(int argc, char *argv[])
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{
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if (argc != 3)
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return 2;
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if (strlen(argv[1]) > MAX_NAME || strlen(argv[2]) > MAX_NAME)
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return 2;
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struct passwd *pw = getpwnam(argv[1]);
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if (!pw)
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return 2;
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struct group *gr = getgrnam(argv[2]);
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if (!gr)
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return 2;
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if (pw->pw_gid == gr->gr_gid) {
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puts("Yes");
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return 0;
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}
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for (char **m = gr->gr_mem; *m; ++m) {
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if (!strcmp(*m, argv[1])) {
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puts("Yes");
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return 0;
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}
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}
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puts("No");
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return 1;
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}
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