File busybox-suidwrapper.c of Package busybox

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>

int main(int argc, char **argv)
{
    const char * cmds[] = {
        "ping",
        "ping6",
        "traceroute",
        "passwd",
        "vlock"
    };

    const char * baseexec = basename(argv[0]);

    if (!strcmp("busybox-suidwrapper", baseexec))
    {
        if (argc > 1 && !strcmp("-l", argv[1])){
          for (int i = 0; i < sizeof(cmds) / sizeof(cmds[0]); ++i)
          {
            printf("%s ", cmds[i]);
          }
          printf("\n");
        } else {
          printf("busybox SUID wrapper\n\nSupported commands:\n");
          printf("Usage:\n -l\tList available SUID commands\n");
          if (argc > 1) return 1;
        }
        return 0;
    }

    for (int i = 0; i < sizeof(cmds) / sizeof(cmds[0]); ++i)
    {
        if (!strcmp(cmds[i], baseexec))
        {
            char **newargv = malloc(sizeof(char *) * (argc + 2));
            newargv[0] = "/usr/bin/busybox";
            newargv[1] = (char *)baseexec;
            for (int i = 1; i < argc; i++)
                newargv[i + 1] = argv[i];
            newargv[argc + 1] = NULL;

            int ret = execv("/usr/bin/busybox", newargv);
            free(newargv);
            perror(argv[0]);
            return ret;
        }
    }
    fprintf(stderr, "%s","error: command not in suid whitelist!\n");
    return 1;
}