set guid.c

/*
*	This tool used to run PHPUnit tests by apache user
*/
    
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

int stracat(char **target, char *source)
{
    char *tmp;
    if (target == NULL) {
	errno = -EINVAL;
	return -1;
    }
			    
    if (*target == NULL)
	tmp = calloc(strlen(source) + 1, sizeof(char));
    else
	tmp = realloc(*target, ((strlen(*target)+strlen(source) + 1) * sizeof(char)));
						    
    if (tmp == NULL) {
	perror("Failure allocating memory for command");
	errno = -ENOMEM;
	return -1;
    }
										    
    strcat(tmp, source);
    *target = tmp;
    return 0;
}


int main(char *argv[])
{
    char *str = NULL;
    int i, result = 0;
    printf("Real UID\t= %d\n", getuid());
    printf("Effective UID\t= %d\n", geteuid());
    printf("Real GID\t= %d\n", getgid());
    printf("Effective GID\t= %d\n", getegid());
    if( setgid(getegid()) ) perror( "set setgid" );
    if( setuid(geteuid()) ) perror( "set setuid" );
    
    for (i = 1; i < argc; i++) {
	    if (stracat(&str, argv[i]) != 0) {
		perror("stracat failed");
		result = errno;
		break;
	    }
	    if (stracat(&str, " ") != 0) {
		perror("stracat failed");
		result = errno;
		break;
	    }
    }
    printf("Try to run: %s", str);
    //return system();
}