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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1999-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* setuid_socket_wrap.c
*
* ./a.out [-s [tag,][addr]:[port]]* [-d [tag,][addr]:[port]]*
* [-r [tag,]proto]* [-p erl_path]* -- program args
*
* Where: -s = stream socket, -d datagram socket and -r means raw socket.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
struct sock_list {
struct sock_list *next;
int fd;
int type;
int protocol;
struct sockaddr_in addr;
char *arg;
};
int parse_addr(addr, str)
struct sockaddr_in *addr;
char *str;
{
int port = 0;
char *cp;
struct hostent *hp;
struct servent *se;
if ((cp = strrchr(str, (int)':')) != NULL)
*cp++ = '\0';
if (cp) {
if (!isdigit((int)cp[0])) {
if ((se = getservbyname(cp, "tcp")) != NULL) {
port = ntohs(se->s_port);
} else {
fprintf(stderr, "unknown port %s\n", cp);
return -1;
}
} else {
port = atoi(cp);
}
}
if (port < 0 || port > 0xffff) {
fprintf(stderr, "bad port number %d\n", port);
return -1;
}
bzero(addr, sizeof(*addr));
addr->sin_family = AF_INET;
addr->sin_port = htons(port);
if (*str == '\000') {
addr->sin_addr.s_addr = INADDR_ANY;
} else {
if ((addr->sin_addr.s_addr = inet_addr(str)) == INADDR_NONE) {
if ((hp = gethostbyname(str)) == NULL) {
fprintf(stderr, "\"%s\" unknown host or address!\n", str);
return -1;
} else {
bcopy(hp->h_addr_list[0], &addr->sin_addr.s_addr,hp->h_length);
}
}
}
return 0;
}
struct sock_list *new_entry(type, argstr)
int type;
char *argstr;
{
struct sock_list *sle;
char *cp;
sle = (struct sock_list *)malloc(sizeof(struct sock_list));
if (!sle)
return NULL;
sle->next = NULL;
sle->fd = -1;
if ((cp = strchr(argstr, (int)',')) != NULL) {
*cp++ = '\0';
sle->arg = argstr;
argstr = cp;
} else {
sle->arg = "-fd";
}
sle->type = type;
switch (type) {
case SOCK_RAW: {
struct protoent *pe;
pe = getprotobyname(argstr);
if (!pe) {
fprintf(stderr, "Unknown protocol: %s\n", argstr);
free(sle);
return NULL;
}
sle->protocol = pe->p_proto;
break;
}
case SOCK_STREAM:
case SOCK_DGRAM:
sle->protocol = 0;
if (parse_addr(&sle->addr, argstr) < 0) {
free(sle);
return NULL;
}
break;
}
return sle;
}
int open_socket(sle)
struct sock_list *sle;
{
sle->fd = socket(AF_INET, sle->type, sle->protocol);
if (sle->fd < 0) {
perror("socket");
return -1;
}
if (sle->type != SOCK_RAW) {
#if 0
printf("binding fd %d to %s:%d\n", sle->fd,
inet_ntoa(sle->addr.sin_addr), ntohs(sle->addr.sin_port));
#endif
if (bind(sle->fd, (struct sockaddr *)&sle->addr, sizeof(sle->addr))<0){
perror("bind");
close(sle->fd);
return -1;
}
}
return sle->fd;
}
int main(argc, argv)
int argc;
char *argv[];
{
struct sock_list *sl = NULL, *sltmp = NULL;
int count = 0;
int c;
char *run_prog = NULL;
while ((c = getopt(argc, argv, "s:d:r:p:")) != EOF)
switch (c) {
case 's':
sltmp = new_entry(SOCK_STREAM, optarg);
if (!sltmp) {
exit(1);
}
sltmp->next = sl;
sl = sltmp;
count++;
break;
case 'd':
sltmp = new_entry(SOCK_DGRAM, optarg);
if (!sltmp) {
exit(1);
}
sltmp->next = sl;
sl = sltmp;
count++;
break;
case 'r':
sltmp = new_entry(SOCK_RAW, optarg);
if (!sltmp) {
exit(1);
}
sltmp->next = sl;
sl = sltmp;
count++;
break;
case 'p':
run_prog = optarg;
break;
default:
exit(1);
}
argc -= optind;
argv += optind;
for(sltmp = sl; sltmp != NULL; sltmp = sltmp->next)
if (open_socket(sltmp) < 0) {
fprintf(stderr, "failed to create socket!\n");
exit(1);
}
setuid(getuid());
{
int i;
char **newargv;
char *run_prog_name;
newargv = (char **)malloc((1 + 2*count + argc + 1) * sizeof(char*));
if ((run_prog_name = strrchr(run_prog, (int)'/')) == NULL)
run_prog_name = run_prog;
else
run_prog_name++;
i = 0;
newargv[i++] = run_prog_name;
for (; argc; argc--, argv++, i++)
newargv[i] = *argv;
for(sltmp = sl; sltmp != NULL; ) {
char *fd_str = (char *)malloc(8);
if (!fd_str) exit(1);
sprintf(fd_str, "%d", sltmp->fd);
if (sltmp->arg && *(sltmp->arg))
newargv[i++] = sltmp->arg;
newargv[i++] = fd_str;
sl = sltmp;
sltmp = sltmp->next;
free(sl);
}
newargv[i] = (char *)NULL;
execv(run_prog, newargv);
perror("exec");
exit(1);
}
exit(0);
}
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