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5533802
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0
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2011-04-04T01:41:24.767
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2011-04-04T01:41:24.767
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670521
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5533282
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2
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<p>I just created 2 programs to show minimum requirements to communicate a client/server with sockets. You can google for each function to learn their prototypes and how they work.</p> <p>Here it is:</p> <h2>Minimum Server (minser.c)</h2> <pre><code>/* Program: minser.c Author: Dr Beco, 2011-04-03 Objective: show a minimum server program that can create a socket, accept a client, read a byte, write a byte, disconnect */ #include <stdio.h> #include <unistd.h> #include <netinet/in.h> #include <sys/un.h> #define BUFFER 2 int main(void) { printf("Configuring environment... "); int p = 3333; // port char data[BUFFER]; struct sockaddr_in dir; struct sockaddr client; socklen_t long_client; int id, idReuse=1, son, aux; memset(&dir,0,sizeof(dir)); dir.sin_port = p; dir.sin_family = AF_INET; dir.sin_addr.s_addr = INADDR_ANY; printf("done!\n"); printf("Creating socket... "); id = socket(AF_INET, SOCK_STREAM, 0); if (id == -1) return -1; printf("done!\n"); printf("Configuring socket... "); if(setsockopt(id,SOL_SOCKET,SO_REUSEADDR,&idReuse,sizeof(idReuse))==-1) return -1; printf("done!\n"); printf("Binding... "); if(bind(id, (struct sockaddr *)&dir, sizeof(dir)) == -1) { close (id); return -1; } printf("done!\n"); printf("Listening... "); if (listen(id , 1) == -1) { close(id); return -1; } printf("done!\n"); printf("Accepting... "); long_client = sizeof (client); son = accept(id, &client, &long_client); if (son == -1) return -1; printf("done!\n"); printf("Reading... "); aux = read(son, data , 1); if(aux!=1) return -1; printf("\"%c\" ", data[0]); printf("done!\n"); printf("Writing \"S\"... "); aux = send(son, "S", 1, MSG_NOSIGNAL); if(aux < 0) return -1; printf("done!\n"); return 0; } </code></pre> <h2>Minimun Client (mincli.c)</h2> <pre><code>/* Program: mincli.c Author: Dr Beco, 2011-04-03 Objective: show a minimum client program that can connect to a network, write a byte, read a byte, disconnect */ #include <stdio.h> #include <unistd.h> #include <netinet/in.h> #include <netdb.h> #define BUFFER 2 int main(void) { printf("Configuring environment... "); char data[BUFFER]; const char *host_server="localhost"; struct sockaddr_in dir; struct hostent *host; int aux, id, p=3333; //port dir.sin_port = p; dir.sin_family = AF_INET; host = gethostbyname(host_server); if(host == NULL) return -1; dir.sin_addr.s_addr = ((struct in_addr *)(host->h_addr))->s_addr; printf("done!\n"); printf("Creating socket... "); id = socket(AF_INET, SOCK_STREAM, 0); if(id == -1) return -1; printf("done!\n"); printf("Connecting... "); if(connect(id, (struct sockaddr *)&dir, sizeof(dir)) == -1) return -1; printf("done!\n"); printf("Writing \"C\"... "); aux = send(id, "C", 1, MSG_NOSIGNAL); if(aux < 0) return -1; printf("done!\n"); printf("Reading... "); aux = read(id, data , 1); if(aux!=1) return -1; printf("\"%c\"", data[0]); printf(" done!\n"); return 0; } </code></pre> <p>Take care, Beco</p>
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1. POReceiving data from ethernet port in C
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1. USDr Beco
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