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/*
* getpeercon_server: simple INET/INET6/UNIX socket getpeercon(3) test server
*
* compile: gcc -Wall -o getpeercon_server -lselinux getpeercon_server.c
*
* Copyright Paul Moore <paul@paul-moore.com>
*
* Paul Wouters <pwouters@redhat.com> added simplistic quit option. If
* the server receives the text "quit" it will quit.
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2008, 2010
* (c) Copyright Red Hat, 2012
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <selinux/selinux.h>
#include <selinux/context.h>
#define UNIX_PATH_MAX 108
#define LISTEN_QUEUE 1
#define RECV_BUF_LEN 1024
/**
* main
*/
int main(int argc, char *argv[])
{
int rc;
short srv_sock_port;
int srv_sock;
const int true_const = 1;
char *srv_sock_path = NULL;
if (argc != 2) {
fprintf(stderr, "usage: %s <port|path>\n", argv[0]);
return 1;
}
srv_sock_port = atoi(argv[1]);
if (srv_sock_port == 0)
srv_sock_path = argv[1];
{
char *ctx;
int rc = getcon(&ctx);
fprintf(stderr, "-> running as %s\n",
rc < 0 ? "NO_CONTEXT" : ctx);
if (rc >= 0)
freecon(ctx);
}
fprintf(stderr, "-> creating socket ... ");
if (srv_sock_path == NULL)
srv_sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
else
srv_sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (srv_sock < 0) {
fprintf(stderr, "socket(2) error: %s\n", strerror(errno));
return 1;
}
rc = setsockopt(srv_sock,
SOL_SOCKET, SO_REUSEADDR, &true_const, sizeof(true_const));
if (rc < 0) {
fprintf(stderr, "setsockopt(2) error: %s\n", strerror(errno));
return 1;
}
fprintf(stderr, "ok\n");
if (srv_sock_path == NULL) {
struct sockaddr_in6 srv_sock_addr;
fprintf(stderr, "-> listening on TCP port %d ... ",
srv_sock_port);
memset(&srv_sock_addr, 0, sizeof(srv_sock_addr));
srv_sock_addr.sin6_family = AF_INET6;
#ifdef NEED_SIN_LEN
srv_sock_addr.sin6_len = sizeof(struct sockaddr_in6);
#endif
memcpy(&srv_sock_addr.sin6_addr, &in6addr_any,
sizeof(in6addr_any));
srv_sock_addr.sin6_port = htons(srv_sock_port);
rc = bind(srv_sock, (struct sockaddr *)&srv_sock_addr,
sizeof(srv_sock_addr));
} else {
struct sockaddr_un srv_sock_addr;
fprintf(stderr, "-> listening on UNIX socket %s ... ",
srv_sock_path);
srv_sock_addr.sun_family = AF_UNIX;
#ifdef NEED_SIN_LEN
#error how do we set srv_sock_addr.sun_len?
#endif
/* make .sun_path both NUL-padded and NUL-terminated */
strncpy(srv_sock_addr.sun_path, srv_sock_path, UNIX_PATH_MAX-1);
srv_sock_addr.sun_path[UNIX_PATH_MAX - 1] = '\0';
rc = bind(srv_sock, (struct sockaddr *)&srv_sock_addr,
sizeof(srv_sock_addr));
}
if (rc < 0) {
fprintf(stderr, "bind(2) error: %s\n", strerror(errno));
return 1;
}
rc = listen(srv_sock, LISTEN_QUEUE);
if (rc < 0) {
fprintf(stderr, "listen(2) error: %s\n", strerror(errno));
return 1;
} else
fprintf(stderr, "ok\n");
fprintf(stderr, "-> waiting ... ");
fflush(stdout);
/* loop forever */
for (;;) {
int cli_sock;
struct sockaddr_storage cli_sock_saddr;
struct sockaddr *const cli_sock_addr = (struct sockaddr *)&cli_sock_saddr;
struct sockaddr_in6 *const cli_sock_6addr = (struct sockaddr_in6 *)&cli_sock_saddr;
socklen_t cli_sock_addr_len;
char cli_sock_addr_str[INET6_ADDRSTRLEN + 1];
char *ctx;
char *ctx_str;
//fflush(stdout);
memset(&cli_sock_saddr, 0, sizeof(cli_sock_saddr));
cli_sock_addr_len = sizeof(cli_sock_saddr);
cli_sock = accept(srv_sock, cli_sock_addr, &cli_sock_addr_len);
if (cli_sock < 0) {
fprintf(stderr, "accept(2) error: %s\n", strerror(errno));
continue;
}
rc = getpeercon(cli_sock, &ctx);
ctx_str = rc < 0 ? "NO_CONTEXT" : ctx;
switch (cli_sock_saddr.ss_family) {
case AF_INET6:
if (IN6_IS_ADDR_V4MAPPED(&cli_sock_6addr->sin6_addr)) {
inet_ntop(AF_INET,
&cli_sock_6addr->sin6_addr.s6_addr32[3],
cli_sock_addr_str, sizeof(cli_sock_addr_str));
} else {
inet_ntop(cli_sock_6addr->sin6_family,
&cli_sock_6addr->sin6_addr,
cli_sock_addr_str, sizeof(cli_sock_addr_str));
}
fprintf(stderr, "<- connect(%s,%s)\n",
cli_sock_addr_str, ctx_str);
break;
case AF_UNIX:
fprintf(stderr, "connect(UNIX,%s)\n", ctx_str);
break;
default:
fprintf(stderr, "connect(%d,%s)\n",
cli_sock_saddr.ss_family, ctx_str);
}
if (rc >= 0)
freecon(ctx);
for (;;) {
char buffer[RECV_BUF_LEN + 1];
rc = recv(cli_sock, buffer, sizeof(buffer) - 1, 0);
if (rc < 0) {
fprintf(stderr, "recv(2) error: %s\n", strerror(errno));
break;
} else if (rc == 0) {
break;
} else {
buffer[rc] = '\0';
/* ??? should this format include a \n? */
printf(" %s", buffer);
if (strcmp(buffer, "quit") == 0)
break;
}
}
close(cli_sock);
fprintf(stderr, "-> connection closed\n");
}
return 0;
}
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