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libipc-old/drop/pass-socket_server.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#define USOCK "./.socket"
#define handle_error(msg) \
do { log_error (msg); exit(EXIT_FAILURE); } while (0)
#define handle_err(fun,msg)\
do { log_error ("%s: file %s line %d %s", fun, __FILE__, __LINE__, msg); } while (0)
void log_format (const char* tag, const char* message, va_list args) {
time_t now;
time(&now);
char * date =ctime(&now);
date[strlen(date) - 1] = '\0';
printf("%s:%s: ", date, tag);
vprintf(message, args);
printf("\n");
}
void log_error (const char* message, ...) {
va_list args;
va_start(args, message);
log_format("error", message, args);
va_end(args);
}
void log_info (const char* message, ...) {
va_list args;
va_start(args, message);
log_format("info", message, args);
va_end(args);
}
void log_debug (const char* message, ...) {
va_list args;
va_start(args, message);
log_format("debug", message, args);
va_end(args);
}
int build_socket (char *servername, char * serverport)
{
int sockfd;
struct sockaddr_in6 server;
socklen_t addrlen;
// socket factory
if((sockfd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP)) == -1)
{
perror("socket");
exit(EXIT_FAILURE);
}
// init remote addr structure and other params
server.sin6_family = AF_INET6;
server.sin6_port = htons(atoi(serverport));
addrlen = sizeof(struct sockaddr_in6);
// get addr from command line and convert it
if(inet_pton(AF_INET6, servername, &server.sin6_addr) != 1)
{
perror("inet_pton");
close(sockfd);
exit(EXIT_FAILURE);
}
printf("Trying to connect to the remote host\n");
if(connect(sockfd, (struct sockaddr *) &server, addrlen) == -1)
{
perror("connect");
exit(EXIT_FAILURE);
}
return sockfd;
}
int usock_connect (int *fd, const char *path)
{
assert (fd != NULL);
assert (path != NULL);
if (fd == NULL) {
handle_err ("usock_connect", "fd == NULL");
return -1;
}
if (path == NULL) {
handle_err ("usock_connect", "path == NULL");
return -1;
}
int sfd;
struct sockaddr_un my_addr;
socklen_t peer_addr_size;
sfd = socket (AF_UNIX, SOCK_STREAM, 0);
if (sfd == -1) {
handle_err ("usock_connect", "sfd == -1");
return -1;
}
// clear structure
memset(&my_addr, 0, sizeof(struct sockaddr_un));
my_addr.sun_family = AF_UNIX;
strncpy(my_addr.sun_path, path, strlen (path));
peer_addr_size = sizeof(struct sockaddr_un);
if(connect(sfd, (struct sockaddr *) &my_addr, peer_addr_size) == -1) {
handle_err ("usock_connect", "connect == -1");
perror("connect()");
exit(errno);
}
*fd = sfd;
return 0;
}
int usock_init (int *fd, const char *path)
{
assert (fd != NULL);
assert (path != NULL);
if (fd == NULL) {
handle_err ("usock_init", "fd == NULL");
return -1;
}
if (path == NULL) {
handle_err ("usock_init", "path == NULL");
return -1;
}
int sfd;
struct sockaddr_un my_addr;
socklen_t peer_addr_size;
sfd = socket (AF_UNIX, SOCK_STREAM, 0);
if (sfd == -1) {
handle_err ("usock_init", "sfd == -1");
return -1;
}
// clear structure
memset(&my_addr, 0, sizeof(struct sockaddr_un));
my_addr.sun_family = AF_UNIX;
strncpy(my_addr.sun_path, path, strlen (path));
// TODO FIXME
// delete the unix socket if already created
peer_addr_size = sizeof(struct sockaddr_un);
if (bind (sfd, (struct sockaddr *) &my_addr, peer_addr_size) == -1) {
handle_err ("usock_init", "bind == -1");
perror("bind()");
return -1;
}
if (listen (sfd, 5) == -1) {
handle_err ("usock_init", "listen == -1");
perror("listen()");
return -1;
}
*fd = sfd;
return 0;
}
int usock_accept (int fd, int *pfd)
{
assert (pfd != NULL);
if (pfd == NULL) {
handle_err ("usock_accept", "pfd == NULL");
return -1;
}
struct sockaddr_un peer_addr;
memset (&peer_addr, 0, sizeof (struct sockaddr_un));
socklen_t peer_addr_size = 0;
*pfd = accept (fd, (struct sockaddr *) &peer_addr, &peer_addr_size);
if (*pfd < 0) {
handle_err ("usock_accept", "accept < 0");
perror("listen()");
return -1;
}
return 0;
}
int usock_close (int fd)
{
int ret;
ret = close (fd);
if (ret < 0) {
handle_err ("usock_close", "close ret < 0");
perror ("closing");
}
return ret;
}
int usock_remove (const char *path)
{
return unlink (path);
}
int build_unix_socket (char * path)
{
int remotefd, localfd;
usock_init (&localfd, path);
usock_accept (localfd, &remotefd);
return remotefd;
}
static
void sendfd (int socket, int fd) // send fd by socket
{
struct msghdr msg = { 0 };
char buf[CMSG_SPACE(sizeof(fd))];
memset(buf, '\0', sizeof(buf));
/* On Mac OS X, the struct iovec is needed, even if it points to minimal data */
struct iovec io = { .iov_base = "", .iov_len = 1 };
msg.msg_iov = &io;
msg.msg_iovlen = 1;
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
struct cmsghdr * cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
memmove(CMSG_DATA(cmsg), &fd, sizeof(fd));
msg.msg_controllen = cmsg->cmsg_len;
if (sendmsg(socket, &msg, 0) < 0)
handle_err("sendfd", "Failed to send message\n");
}
int main(int argc, char * argv[])
{
// check the number of args on command line
if(argc != 3)
{
fprintf (stderr, "USAGE: %s @server port_num\n", argv[0]);
exit(EXIT_FAILURE);
}
char *servername = argv[1];
char *serverport = argv[2];
printf("Connection to the tcp socket\n");
// 1. socket creation (tcp), connection to the server
int sockfd = build_socket (servername, serverport);
printf("Sending 'coucou' to the tcp socket\n");
// send a message to check the connection is effective
if (write(sockfd, "coucou\n", strlen("coucou\n")) == -1) {
perror("write");
close(sockfd);
exit(EXIT_FAILURE);
}
printf ("Connection to the unix socket\n");
// 2. socket creation (unix)
int usockfd = build_unix_socket (USOCK);
printf ("Passing the tcp socket to the unix socket\n");
// 3. tcp socket passing to the client
sendfd (usockfd, sockfd);
// send a message to check the connection is (still) effective
if (write(sockfd, "bye\n", strlen("bye\n")) == -1) {
perror("write");
close(sockfd);
exit(EXIT_FAILURE);
}
printf("Disconnection\n");
// 4. close sockets
close(usockfd);
close(sockfd);
usock_remove (USOCK);
return EXIT_SUCCESS;
}