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POSocket Program file transfer
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copied!<p>When I am transferring a binary file using below code, only half of the file is being transferred. When I check the same code on using the loopback address with same binary file it works properly, i.e. the whole file get transferred. </p> <p>Is there any problem with the following code or my network?</p> <p>Client.c:</p> <pre><code>#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, 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, "192.168.103.190", &remote_addr.sin_addr); //inet_pton(AF_INET, "192.168.103.179", &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 to server*/ char* fs_name = "/usr/local/context.2848"; 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,i=0; while((fs_block_sz = fread(sdbuf, sizeof(char), LENGTH, fs)) > 0) { printf("Data Sent %d = %d\n",i,fs_block_sz); if(send(sockfd, 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); i++; } close (sockfd); printf("[Client] Connection lost.\n"); return (0); } </code></pre> <p>Server.c</p> <pre><code>#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, 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/ankita/context.2848"; 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; int i=0; while((fr_block_sz = recv(nsockfd, revbuf, LENGTH, 0)) > 0) { printf("Data Received %d = %d\n",i,fr_block_sz); 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); i++; } 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); } success = 1; } } </code></pre>

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