?? tcpclient.c
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/******************************************************************************//* This file has been written by Sergio Perez Alca駃z <serpeal@upvnet.upv.es> *//* Departamento de Inform醫ica de Sistemas y Computadores *//* Universidad Polit閏nica de Valencia *//* Valencia (Spain) *//* *//* The RTL-lwIP project has been supported by the Spanish Government Research *//* Office (CICYT) under grant TIC2002-04123-C03-03 *//******************************************************************************/#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <netdb.h>#include <stdio.h>#include <unistd.h> /* close */#define SERVER_PORT 7#define MAX_MSG 100int main (int argc, char *argv[]) { int sd, rc, i; struct sockaddr_in localAddr, servAddr; struct hostent *h; if(argc < 3) { printf("usage: %s <server> <data1> <data2> ... <dataN>\n",argv[0]); exit(1); } h = gethostbyname(argv[1]); if(h==NULL) { printf("%s: unknown host '%s'\n",argv[0],argv[1]); exit(1); } servAddr.sin_family = h->h_addrtype; memcpy((char *) &servAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length); servAddr.sin_port = htons(SERVER_PORT); /* create socket */ sd = socket(AF_INET, SOCK_STREAM, 0); if(sd<0) { perror("cannot open socket "); exit(1); } /* bind any port number */ localAddr.sin_family = AF_INET; localAddr.sin_addr.s_addr = htonl(INADDR_ANY); localAddr.sin_port = htons(0); rc = bind(sd, (struct sockaddr *) &localAddr, sizeof(localAddr)); if(rc<0) { printf("%s: cannot bind port TCP %u\n",argv[0],SERVER_PORT); perror("error "); exit(1); } /* connect to server */ rc = connect(sd, (struct sockaddr *) &servAddr, sizeof(servAddr)); if(rc<0) { perror("cannot connect "); exit(1); } for(i=2;i<argc;i++) { rc = send(sd, argv[i], strlen(argv[i]) + 1, 0); if(rc<0) { perror("cannot send data "); close(sd); exit(1); } printf("%s: data%u sent (%s)\n",argv[0],i-1,argv[i]); } close(sd);return 0; }
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