Transfert de fichier client/serveur à l'aide de socket

Je suis en train de faire un transfert de fichiers entre le serveur et le client, mais fonctionne très mal. Fondamentalement, ce qui doit arriver est:
1) Le client d'envoyer un fichier txt sur le serveur (je l'ai appelé "quotidiani.txt")
2) Le serveur enregistre dans un autre fichier txt ("receive.txt")
3) Le serveur exécute un script qui modifie et enregistre sous un autre nom ("output.txt")
4) Le serveur d'envoyer le fichier vers le client qui le sauve (sur le même socket) avec le nom (final.txt)

Le problème est que le premier fichier (quotidiani.txt) lire juste pour une petite partie, et puis il y a quelques erreurs. J'aimerais que quelqu'un m'aide à comprendre et à corriger mes erreurs.

Voici mon code:

client.c:

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <signal.h>
#include <ctype.h>          
#include <arpa/inet.h>
#include <netdb.h>
#define PORT 20000
#define LENGTH 512 
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
/* Variable Definition */
int sockfd; 
int nsockfd;
char revbuf[LENGTH]; 
struct sockaddr_in remote_addr;
/* Get the Socket file descriptor */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
fprintf(stderr, "ERROR: Failed to obtain Socket Descriptor! (errno = %d)\n",errno);
exit(1);
}
/* Fill the socket address struct */
remote_addr.sin_family = AF_INET; 
remote_addr.sin_port = htons(PORT); 
inet_pton(AF_INET, "127.0.0.1", &remote_addr.sin_addr); 
bzero(&(remote_addr.sin_zero), 8);
/* Try to connect the remote */
if (connect(sockfd, (struct sockaddr *)&remote_addr, sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "ERROR: Failed to connect to the host! (errno = %d)\n",errno);
exit(1);
}
else 
printf("[Client] Connected to server at port %d...ok!\n", PORT);
/* Send File to Server */
//if(!fork())
//{
char* fs_name = "/home/aryan/Desktop/quotidiani.txt";
char sdbuf[LENGTH]; 
printf("[Client] Sending %s to the Server... ", fs_name);
FILE *fs = fopen(fs_name, "r");
if(fs == NULL)
{
printf("ERROR: File %s not found.\n", fs_name);
exit(1);
}
bzero(sdbuf, LENGTH); 
int fs_block_sz; 
while((fs_block_sz = fread(sdbuf, sizeof(char), LENGTH, fs)) > 0)
{
if(send(sockfd, sdbuf, fs_block_sz, 0) < 0)
{
fprintf(stderr, "ERROR: Failed to send file %s. (errno = %d)\n", fs_name, errno);
break;
}
bzero(sdbuf, LENGTH);
}
printf("Ok File %s from Client was Sent!\n", fs_name);
//}
/* Receive File from Server */
printf("[Client] Receiveing file from Server and saving it as final.txt...");
char* fr_name = "/home/aryan/Desktop/progetto/final.txt";
FILE *fr = fopen(fr_name, "a");
if(fr == NULL)
printf("File %s Cannot be opened.\n", fr_name);
else
{
bzero(revbuf, LENGTH); 
int fr_block_sz = 0;
while((fr_block_sz = recv(sockfd, revbuf, LENGTH, 0)) > 0)
{
int write_sz = fwrite(revbuf, sizeof(char), fr_block_sz, fr);
if(write_sz < fr_block_sz)
{
error("File write failed.\n");
}
bzero(revbuf, LENGTH);
if (fr_block_sz == 0 || fr_block_sz != 512) 
{
break;
}
}
if(fr_block_sz < 0)
{
if (errno == EAGAIN)
{
printf("recv() timed out.\n");
}
else
{
fprintf(stderr, "recv() failed due to errno = %d\n", errno);
}
}
printf("Ok received from server!\n");
fclose(fr);
}
close (sockfd);
printf("[Client] Connection lost.\n");
return (0);
}

serveur.c

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <signal.h>
#include <ctype.h>          
#include <arpa/inet.h>
#include <netdb.h>
#define PORT 20000 
#define BACKLOG 5
#define LENGTH 512 
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main ()
{
/* Defining Variables */
int sockfd; 
int nsockfd; 
int num;
int sin_size; 
struct sockaddr_in addr_local; /* client addr */
struct sockaddr_in addr_remote; /* server addr */
char revbuf[LENGTH]; //Receiver buffer
/* Get the Socket file descriptor */
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 )
{
fprintf(stderr, "ERROR: Failed to obtain Socket Descriptor. (errno = %d)\n", errno);
exit(1);
}
else 
printf("[Server] Obtaining socket descriptor successfully.\n");
/* Fill the client socket address struct */
addr_local.sin_family = AF_INET; //Protocol Family
addr_local.sin_port = htons(PORT); //Port number
addr_local.sin_addr.s_addr = INADDR_ANY; //AutoFill local address
bzero(&(addr_local.sin_zero), 8); //Flush the rest of struct
/* Bind a special Port */
if( bind(sockfd, (struct sockaddr*)&addr_local, sizeof(struct sockaddr)) == -1 )
{
fprintf(stderr, "ERROR: Failed to bind Port. (errno = %d)\n", errno);
exit(1);
}
else 
printf("[Server] Binded tcp port %d in addr 127.0.0.1 sucessfully.\n",PORT);
/* Listen remote connect/calling */
if(listen(sockfd,BACKLOG) == -1)
{
fprintf(stderr, "ERROR: Failed to listen Port. (errno = %d)\n", errno);
exit(1);
}
else
printf ("[Server] Listening the port %d successfully.\n", PORT);
int success = 0;
while(success == 0)
{
sin_size = sizeof(struct sockaddr_in);
/* Wait a connection, and obtain a new socket file despriptor for single connection */
if ((nsockfd = accept(sockfd, (struct sockaddr *)&addr_remote, &sin_size)) == -1) 
{
fprintf(stderr, "ERROR: Obtaining new Socket Despcritor. (errno = %d)\n", errno);
exit(1);
}
else 
printf("[Server] Server has got connected from %s.\n", inet_ntoa(addr_remote.sin_addr));
/*Receive File from Client */
char* fr_name = "/home/aryan/Desktop/receive.txt";
FILE *fr = fopen(fr_name, "a");
if(fr == NULL)
printf("File %s Cannot be opened file on server.\n", fr_name);
else
{
bzero(revbuf, LENGTH); 
int fr_block_sz = 0;
while((fr_block_sz = recv(nsockfd, revbuf, LENGTH, 0)) > 0) 
{
int write_sz = fwrite(revbuf, sizeof(char), fr_block_sz, fr);
if(write_sz < fr_block_sz)
{
error("File write failed on server.\n");
}
bzero(revbuf, LENGTH);
if (fr_block_sz == 0 || fr_block_sz != 512) 
{
break;
}
}
if(fr_block_sz < 0)
{
if (errno == EAGAIN)
{
printf("recv() timed out.\n");
}
else
{
fprintf(stderr, "recv() failed due to errno = %d\n", errno);
exit(1);
}
}
printf("Ok received from client!\n");
fclose(fr); 
}
/* Call the Script */
system("cd ; chmod +x script.sh ; ./script.sh");
/* Send File to Client */
//if(!fork())
//{
char* fs_name = "/home/aryan/Desktop/output.txt";
char sdbuf[LENGTH]; //Send buffer
printf("[Server] Sending %s to the Client...", fs_name);
FILE *fs = fopen(fs_name, "r");
if(fs == NULL)
{
fprintf(stderr, "ERROR: File %s not found on server. (errno = %d)\n", fs_name, errno);
exit(1);
}
bzero(sdbuf, LENGTH); 
int fs_block_sz; 
while((fs_block_sz = fread(sdbuf, sizeof(char), LENGTH, fs))>0)
{
if(send(nsockfd, sdbuf, fs_block_sz, 0) < 0)
{
fprintf(stderr, "ERROR: Failed to send file %s. (errno = %d)\n", fs_name, errno);
exit(1);
}
bzero(sdbuf, LENGTH);
}
printf("Ok sent to client!\n");
success = 1;
close(nsockfd);
printf("[Server] Connection with Client closed. Server will wait now...\n");
while(waitpid(-1, NULL, WNOHANG) > 0);
//}
}
}

OriginalL'auteur AscaL | 2012-06-28