118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
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#include "client.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 information */
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// Server information
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struct hostent *server_host;
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// Server socket address
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static struct sockaddr_in server_addr;
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// Server socket address length
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socklen_t sock_len;
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// Local socket
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int sock;
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/* (2) Misc. information */
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// Response
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char *msg = "some message";
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// Reception buffer
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char buffer[BUFSIZE];
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// Will contain the response
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char *response;
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// Will contain the length of received/sent data
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int nb_bytes;
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/* [2] UPD socket creation
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=========================================================*/
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/* (1) Socket initialization */
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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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) Get host information */
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server_host = gethostbyname("localhost");
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/* (2-) Manage error */
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if( server_host == NULL ){
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perror("erreur adresse serveur");
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exit(1);
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}
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/* (3) Create destination socket */
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bzero(&server_addr, sizeof(struct sockaddr_in)); // clean @server_addr struct before updating
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server_addr.sin_family = AF_INET; // set server addr family (ipv4)
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server_addr.sin_port = htons(4000); // set server port
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memcpy( &server_addr.sin_addr.s_addr, // ) set host ipv4 addr
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/* ( */ server_host->h_addr, // )
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/* ( */ server_host->h_length );
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/* [3] Send message
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=========================================================*/
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// calculate server id struct size
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sock_len = sizeof(struct sockaddr_in);
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/* (1) Send message to server (identified by <sockaddr_in>) */
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nb_bytes = sendto( sock, // ) socket
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/* ( */ msg, // ) buffer
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/* ( */ strlen(msg) + 1, // ) buffer size
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/* ( */ 0, // ) flags
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/* ( */ (struct sockaddr*) &server_addr, // ) server identifier
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/* ( */ sock_len ); // identifier size
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/* (2) Check if send succesfully */
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if( nb_bytes == -1 ){
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perror("erreur envoi message");
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exit(1);
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}
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// log
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printf("paquet envoyé, nb_bytes = %d\n",nb_bytes);
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/* [4] Wait for response
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=========================================================*/
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nb_bytes = recvfrom( sock, // ) socket
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/* ( */ buffer, // ) receive buffer
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/* ( */ BUFSIZE, // ) buffer size
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/* ( */ 0, // ) flags
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/* ( */ (struct sockaddr*) &server_addr, // ) server identifier
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/* ( */ &sock_len ); // identifier size
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/* (2) Check if received successfully (and consistently) */
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if( nb_bytes == -1 ){
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perror("erreur réponse serveur");
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exit(1);
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}
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/* (3) Copy response into var */
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response = (char *) malloc(nb_bytes * sizeof(char));
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memcpy(response, buffer, nb_bytes);
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/* (4) log */
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printf("response recue du serveur : %s\n",response);
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/* [5] Close socket
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=========================================================*/
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close(sock);
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return 0;
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}
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