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server.c
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server.c
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/*
** server.c -- a stream socket server demo
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/sendfile.h>
#define PORT "3490" // the port users will be connecting to
#define BUFFSIZE 256
#define BACKLOG 10 // how many pending connections queue will hold
//#define _POSIX_C_SOURCE
int callScript(void){
char *cmd = "/home/sepehr/miniconda3/envs/3.7venv/bin/python3.7 /home/sepehr/SeFar/Capstone_NN/smile/smile_detector.py \"/home/sepehr/SeFar/Capstone_Network/s1.mp4\"";
return WEXITSTATUS(system(cmd));
}
void sigchld_handler(int s)
{
(void)s; // quiet unused variable warning
// waitpid() might overwrite errno, so we save and restore it:
int saved_errno = errno;
while(waitpid(-1, NULL, WNOHANG) > 0);
errno = saved_errno;
}
// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
int main(void)
{
int sockfd, new_fd; // listen on sock_fd, new connection on new_fd
struct addrinfo hints, *servinfo, *p;
struct sockaddr_storage their_addr; // connector's address information
socklen_t sin_size;
struct sigaction sa;
int yes=1;
char s[INET6_ADDRSTRLEN];
int rv, len;
memset(&hints, 0, sizeof hints); // make sure the struct is empty
hints.ai_family = AF_UNSPEC; // don't care IPv4 or IPv6
hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
hints.ai_flags = AI_PASSIVE; // use my IP
if ((rv = getaddrinfo(NULL, PORT, &hints, &servinfo)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return 1;
}
// servinfo now points to a linked list of 1 or more struct addrinfos
// loop through all the results and bind to the first we can
for(p = servinfo; p != NULL; p = p->ai_next) {
if ((sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
perror("server: socket");
continue;
}
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(int)) == -1) {
perror("setsockopt");
exit(1);
}
if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
close(sockfd);
perror("server: bind");
continue;
}
break;
}
freeaddrinfo(servinfo); // all done with this structure
if (p == NULL) {
fprintf(stderr, "server: failed to bind\n");
exit(1);
}
if (listen(sockfd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
sa.sa_handler = sigchld_handler; // reap all dead processes
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction");
exit(1);
}
printf("server: waiting for connections...\n");
while(1) { // main accept() loop
sin_size = sizeof their_addr;
new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
if (new_fd == -1) {
perror("accept");
continue;
}
inet_ntop(their_addr.ss_family,
get_in_addr((struct sockaddr *)&their_addr), // using the function we made to handeling both ipv4 and ipv6
s, sizeof s); // destination ip to presentation
printf("server: got connection from %s\n", s);
if (!fork()) { // this is the child process
char p_array[BUFFSIZE];
int recv_bytes;
char ending_char[BUFFSIZE];
snprintf(ending_char, BUFFSIZE, "%d", 1);
int nb;
close(sockfd); // child doesn't need the listener
while(1){
FILE *image = fopen("s1.mp4", "w");
if (image == NULL){
fprintf(stderr, "Failed to open file s1.mp4 --> %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
if ((nb = recv(new_fd, p_array, BUFFSIZE, 0)) == -1){
perror("recv");
exit(1);
bzero(p_array,BUFFSIZE);
}
while (nb == 0){
nb = recv(new_fd, p_array, BUFFSIZE, 0);
bzero(p_array,BUFFSIZE);
}
int file_size = atoi(p_array);
int remain_data = file_size;
printf("File size is %d bytes\n", remain_data);
if (file_size == 1){
// closing the connection
printf("server 1 received ending message: closing the connection\n");
break; //terminating the child process
}
//printf("%d\n", nb);
bzero(p_array,BUFFSIZE);
while ((remain_data > 0) && ((nb = recv(new_fd, p_array, BUFFSIZE, 0)) > 0)) {
fwrite(p_array, sizeof(char), nb, image);
remain_data -= nb;
fprintf(stdout, "Receive %d bytes and we hope :- %d bytes\n", nb, remain_data);
bzero(p_array,BUFFSIZE);
}
fclose(image);
int code = callScript();
len = snprintf(NULL, 0, "%d", code);
char* retStatus = malloc(len+1);
snprintf(retStatus, len+1, "%d", code);
if (len = send(new_fd, retStatus, len, 0) < 0){
fprintf(stderr, "Error on sending response --> %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
free(retStatus);
}
close(new_fd); // closing the connection
printf("server: waiting for connections...\n");
exit(0); //terminating the child process
}
close(new_fd); // parent doesn't need this
}
return 0;
}