125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
#include "server.h"
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int main(int argc, char* argv[]){
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/* [1] Initialisation
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=========================================================*/
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/* (1) Socket info */
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// Server (local)
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static struct sockaddr_in addr_server;
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// Client
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static struct sockaddr_in addr_client;
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// Client identifier
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struct hostent *host_client = NULL;
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// Socket size
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socklen_t sock_len;
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char client_ip[20];
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// Socket
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int sock;
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/* (2) Misc. information */
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// response
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char *response = "bien recu";
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// reception buffer
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char buffer[BUFSIZE];
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// received buffer
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char *received;
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// length of received/sent data
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int buf_len;
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/* [2] Create socket
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=========================================================*/
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/* (1) Create socket */
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sock = socket(AF_INET, SOCK_DGRAM, 0); // ipv4, udp, flags?
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/* (1-) Manage error */
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if( sock == -1 ){
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perror("erreur création socket");
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exit(1);
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}
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/* (2) Set socket information */
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bzero(&addr_server, sizeof(struct sockaddr_in));
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addr_server.sin_family = AF_INET; // ipv4
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addr_server.sin_port = htons(4000); // port: 4000
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addr_server.sin_addr.s_addr = htonl(INADDR_ANY); //
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/* (3) Bind socket to local port */
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int bounded = bind( sock, // ) socket
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/* ( */ (struct sockaddr*)&addr_server, // ) filled with address
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/* ( */ sizeof(addr_server) ); // length of struct
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/* (3-) Manage error */
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if( bounded == -1 ){
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perror("erreur bind");
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exit(1);
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}
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/* [3] Wait for client message
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=========================================================*/
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// set socket length
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sock_len = sizeof(struct sockaddr_in);
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/* (1) Wait for message */
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buf_len = recvfrom(sock, // ) socket
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/* ( */ buffer, // ) buffer
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/* ( */ BUFSIZE, // ) buffer length
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/* ( */ 0, // ) flags
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/* ( */ (struct sockaddr *)&addr_client, // ) client addr (filled)
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/* ( */ &sock_len );
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/* (1-) Manage error */
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if( buf_len == -1 ){
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perror("erreur réception paquet");
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exit(1);
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}
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// Get client ip
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inet_ntop(AF_INET, &(addr_client.sin_addr), client_ip, 20);
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/* (2) Fetch client information */
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// récupère nom de la machine émettrice des données
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host_client = gethostbyaddr( &addr_client.sin_addr, // ) client addr (filled)
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/* ( */ sizeof(struct in_addr), // ) sizeof addr
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/* ( */ AF_INET ); // ipv4
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/* (2-) Manage error */
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if( host_client == NULL ){
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perror("erreur gethostbyaddr");
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exit(1);
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}
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/* (3) Store message */
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received = (char *) malloc(buf_len * sizeof(char));
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memcpy(received, buffer, buf_len);
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printf( "recu message %s de %s:%d\n", received, client_ip, ntohs(addr_client.sin_port) );
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/* [4] Send response
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=========================================================*/
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/* (1) Send response */
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buf_len = sendto(sock, // ) socket
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/* ( */ response, // ) response
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/* ( */ strlen(response)+1, // ) response length
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/* ( */ 0, // ) flags
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/* ( */ (struct sockaddr*) &addr_client, // ) client identifier
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/* ( */ sock_len ); // identifier length
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/* (1-) Manage error */
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if( buf_len == -1 ){
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perror("erreur envoi réponse");
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exit(1);
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}
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/* [5] Close socket
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=========================================================*/
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close(sock);
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}
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