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client.c
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client.c
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#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdlib.h>
int receive_fd(int socket) {
struct msghdr msg = {0};
char m_buffer[256];
struct iovec io = { .iov_base = m_buffer, .iov_len = sizeof(m_buffer) };
msg.msg_iov = &io;
msg.msg_iovlen = 1;
char c_buffer[256];
msg.msg_control = c_buffer;
msg.msg_controllen = sizeof(c_buffer);
if (recvmsg(socket, &msg, 0) < 0) {
fprintf(stderr, "Failed to receive message\n");
exit(1);
}
struct cmsghdr * cmsg = CMSG_FIRSTHDR(&msg);
unsigned char * data = CMSG_DATA(cmsg);
int fd = *((int*) data);
return fd;
}
int main(int argc, char **argv) {
struct sockaddr_un addr;
int sfd = socket(AF_UNIX, SOCK_STREAM, 0);
// Make sure socket's file descriptor is legit.
if (sfd == -1) {
perror("socket");
return 1;
}
//
// Construct server address, and make the connection.
//
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, "/tmp/sock", sizeof(addr.sun_path) - 1);
// Connects the active socket referred to be sfd to the listening socket
// whose address is specified by addr.
if (connect(sfd, (struct sockaddr *) &addr,
sizeof(struct sockaddr_un)) == -1) {
perror("connect");
return -1;
}
int fd = receive_fd(sfd);
close(sfd);
bool open = true;
while (open) {
char buf[1024];
size_t nread = read(0, buf, 1024);
if (nread > 0) {
if (write(fd, buf, nread) <1) {
perror("write");
return 1;
}
} else {
open = false;
}
}
return 0;
}