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/*
* privbind - allow unpriviledged apps to bind to priviledged ports
* Copyright (C) 2007 Nadav Har'el
* Copyright (C) 2007 Shachar Shemesh
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <pthread.h>
#define TEST_PORT 987
struct cmdoptions {
int port; /* Port number to bind */
int numbinds; /* Number of binds to perform */
int wait; /* Number of seconds to wait after last bind */
int processes; /* Number of processes to perform the bind from */
int threads; /* Number of threads to perform the bind from */
} options={ TEST_PORT, 1, 0, 1, 1 };
void help( const char *progname )
{
printf("testbin - Try to bind a privileged port\n");
printf("Usage: %s [-n NUM] [-p NUM] [-w NUM]\n", progname);
printf("\n");
printf("-p NUM - Port number to bind. Default is %d\n", options.port);
printf("-n NUM - Number of times to attempt bind. Default is %d\n", options.numbinds);
printf("-w NUM - Number of seconds to wait after last bind.\n");
printf("-P NUM - Number of processes to bind from.\n");
printf("-T NUM - Number of threads to bind from.\n");
}
int parse_cmdline( int argc, char *argv[] )
{
/* Fill in default values */
int opt;
while( (opt=getopt(argc, argv, "+n:w:p:hP:T:" ))!=-1 ) {
switch(opt) {
case 'n':
options.numbinds=atoi(optarg);
break;
case 'w':
options.wait=atoi(optarg);
break;
case 'p':
options.port=atoi(optarg);
break;
case 'h':
help(argv[0]);
exit(0);
case '?':
help(argv[0]);
exit(1);
case 'P':
options.processes=atoi(optarg);
break;
case 'T':
options.threads=atoi(optarg);
break;
}
}
return optind;
}
int perform_bind( )
{
int fd;
struct sockaddr_in addr;
fd = socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
return 0;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(options.port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
printf("Process %d thread %lx: About to bind\n", getpid(), pthread_self() );
struct timeval tv1, tv2;
gettimeofday(&tv1, NULL);
int res=bind(fd, (struct sockaddr *)&addr, sizeof(addr));
gettimeofday(&tv2, NULL);
tv2.tv_sec-=tv1.tv_sec;
if(tv1.tv_usec>tv2.tv_usec) {
tv2.tv_sec--;
tv2.tv_usec+=1000000;
}
tv2.tv_usec-=tv1.tv_usec;
printf("Process %d thread %lx: Bind returned %d. Took %ld.%06ld secs\n", getpid(),
pthread_self(), res, tv2.tv_sec, tv2.tv_usec );
close(fd);
if(res==-1) {
perror("bind");
return 0;
}
return 1;
}
void *perform_binds( void *p )
{
int i=options.numbinds;
printf("Process %d thread %lx performs %d binds\n", getpid(), pthread_self(), i);
while( i-->0 ) {
perform_bind(NULL);
}
return NULL;
}
int main(int argc, char *argv[])
{
parse_cmdline( argc, argv );
printf("running as user: %d (%s).\n", getuid(), getpwuid(getuid())->pw_name);
printf("running as group: %d (%s).\n", getgid(), getgrgid(getgid())->gr_name);
printf("running as process %d\n", getpid() );
fflush(stdout);
/* Make sure we have the correct concurrency level */
int i;
int parent=1;
for( i=1; parent && i<options.processes; ++i ) {
if( fork()==0 ) {
printf("Created new process %d\n", getpid() );
parent=0; /* We are not the ones who need to wait() at the end */
}
}
pthread_t *threads=calloc(sizeof(pthread_t), options.threads-1);
for( i=1; i<options.threads; ++i ) {
pthread_create( threads+i-1, NULL, perform_binds, NULL );
}
/* And once more for the main thread */
perform_binds(NULL);
/* Sleep to check if the parent sticks around after the bind (if -n 1
is used, it shouldn't */
if( options.wait>0 ) {
printf("Sleeping for %d seconds...\n", options.wait);
sleep(options.wait);
}
/* Collect all started threads */
for( i=1; i<options.threads; ++i ) {
pthread_join(threads[i-1], NULL );
printf("Process %d joined thread %lx\n", getpid(), threads[i-1]);
}
printf("Process %d done\n", getpid() );
fflush(stdout);
if( parent ) {
for( i=1; i<options.processes; ++i ) {
int status;
int pid=wait(&status);
printf("Reaped process %d\n", pid);
}
}
return 0;
}
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