lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* This test was ripped out of GNU 'id' from coreutils-5.0 |
| 2 | * by Erik Andersen. |
| 3 | * |
| 4 | * |
| 5 | * id is Copyright (C) 1989-2003 Free Software Foundation, Inc. |
| 6 | * and licensed under the GPL v2 or later, and was written by |
| 7 | * Arnold Robbins, with a major rewrite by David MacKenzie, |
| 8 | */ |
| 9 | |
| 10 | #include <stdio.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <unistd.h> |
| 13 | #include <sys/types.h> |
| 14 | #include <pwd.h> |
| 15 | #include <grp.h> |
| 16 | #include <err.h> |
| 17 | |
| 18 | /* The number of errors encountered so far. */ |
| 19 | static int problems = 0; |
| 20 | |
| 21 | /* Print the name or value of group ID GID. */ |
| 22 | static void print_group(gid_t gid) |
| 23 | { |
| 24 | struct group *grp = NULL; |
| 25 | |
| 26 | grp = getgrgid(gid); |
| 27 | if (grp == NULL) { |
| 28 | warn("cannot find name for group ID %u", gid); |
| 29 | problems++; |
| 30 | } |
| 31 | |
| 32 | if (grp == NULL) |
| 33 | printf("%u", (unsigned)gid); |
| 34 | else |
| 35 | printf("%s", grp->gr_name); |
| 36 | } |
| 37 | |
| 38 | static int xgetgroups(gid_t gid, int *n_groups, gid_t ** groups) |
| 39 | { |
| 40 | int max_n_groups; |
| 41 | int ng; |
| 42 | gid_t *g; |
| 43 | int fail = 0; |
| 44 | |
| 45 | max_n_groups = getgroups(0, NULL); |
| 46 | |
| 47 | /* Add 1 just in case max_n_groups is zero. */ |
| 48 | g = (gid_t *) malloc(max_n_groups * sizeof(gid_t) + 1); |
| 49 | if (g == NULL) |
| 50 | err(EXIT_FAILURE, "out of memory"); |
| 51 | ng = getgroups(max_n_groups, g); |
| 52 | |
| 53 | if (ng < 0) { |
| 54 | warn("cannot get supplemental group list"); |
| 55 | ++fail; |
| 56 | free(g); |
| 57 | } |
| 58 | if (!fail) { |
| 59 | *n_groups = ng; |
| 60 | *groups = g; |
| 61 | } |
| 62 | return fail; |
| 63 | } |
| 64 | |
| 65 | /* Print all of the distinct groups the user is in. */ |
| 66 | int main(int argc, char *argv[]) |
| 67 | { |
| 68 | struct passwd *pwd; |
| 69 | |
| 70 | pwd = getpwuid(getuid()); |
| 71 | if (pwd == NULL) |
| 72 | problems++; |
| 73 | |
| 74 | print_group(getgid()); |
| 75 | if (getegid() != getgid()) { |
| 76 | putchar(' '); |
| 77 | print_group(getegid()); |
| 78 | } |
| 79 | |
| 80 | { |
| 81 | int n_groups = 0; |
| 82 | gid_t *groups; |
| 83 | register int i; |
| 84 | |
| 85 | if (xgetgroups((pwd ? pwd->pw_gid : (gid_t) - 1), |
| 86 | &n_groups, &groups)) { |
| 87 | return ++problems; |
| 88 | } |
| 89 | |
| 90 | for (i = 0; i < n_groups; i++) |
| 91 | if (groups[i] != getgid() && groups[i] != getegid()) { |
| 92 | putchar(' '); |
| 93 | print_group(groups[i]); |
| 94 | } |
| 95 | free(groups); |
| 96 | } |
| 97 | putchar('\n'); |
| 98 | return (problems != 0); |
| 99 | } |