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group_helper.c
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group_helper.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <grp.h>
int main(int argc, char *argv[]) {
if (argc < 3) {
printf("Usage: %s [create/add] [option input] [additional inputs (for add option only)]\n", argv[0]);
exit(1);
}
if (strcmp(argv[1], "create") == 0) {
struct group grp;
struct group *result;
char *buf;
size_t bufsize;
int s;
bufsize = sysconf(_SC_GETGR_R_SIZE_MAX);
if (bufsize == -1) {
bufsize = 16384;
}
buf = malloc(bufsize);
if (buf == NULL) {
perror("malloc");
exit(1);
}
s = getgrnam_r(argv[2], &grp, buf, bufsize, &result);
if (result == NULL) {
if (s == 0) {
printf("Group '%s' already exists\n", argv[2]);
} else {
errno = s;
perror("getgrnam_r");
}
exit(1);
}
if (result == NULL) {
printf("Creating group '%s'\n", argv[2]);
if (system(strcat("groupadd ",argv[2])) != 0) {
perror("system");
exit(1);
}
}
} else if (strcmp(argv[1], "add") == 0) {
if (argc < 4) {
printf("Usage: %s add [group name] [user(s) to add to the group]\n", argv[0]);
exit(1);
}
int i;
char command[1024];
snprintf(command, sizeof(command), "usermod -a -G %s", argv[2]);
for (i = 3; i < argc; i++) {
strncat(command, " ", sizeof(command) - strlen(command) - 1);
strncat(command, argv[i], sizeof(command) - strlen(command) - 1);
}
printf("Adding users to group '%s'\n", argv[2]);
if (system(command) != 0) {
perror("system");
exit(1);
}
} else {
printf("Invalid option '%s'\n", argv[1]);
printf("Usage: %s [create/add] [option input] [additional inputs (for add option only)]\n", argv[0]);
exit(1);
}
return 0;
}