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client-server/client.c
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <sys/types.h> | |
#include <sys/socket.h> | |
#include <netdb.h> | |
#include <netinet/in.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <sys/select.h> | |
#include <assert.h> | |
void checkError(int status,int line) | |
{ | |
if (status < 0) { | |
printf("socket error(%d)-%d: [%s]\n",getpid(),line,strerror(errno)); | |
exit(-1); | |
} | |
} | |
int main(int argc, char ** argv) { | |
int sid = socket(PF_INET,SOCK_STREAM,0); | |
struct sockaddr_in srv; | |
struct hostent *server = gethostbyname("localhost"); | |
if (server==NULL) { | |
printf("Couldn't find a host named: %s\n",argv[1]); | |
return 2; | |
} | |
srv.sin_family = AF_INET; | |
srv.sin_port = htons(8025); | |
memcpy(&srv.sin_addr,server->h_addr_list[0],server->h_length); | |
int status = connect(sid,(struct sockaddr*)&srv,sizeof(srv)); | |
checkError(status,__LINE__); | |
fd_set readfds; | |
char ch; | |
while (1) { | |
FD_ZERO(&readfds); | |
FD_SET(0,&readfds); | |
FD_SET(sid, &readfds); | |
int ready = select(sid+1, &readfds, NULL,NULL,NULL); | |
if (ready) { | |
if (FD_ISSET(0,&readfds)) { | |
int rc = read(0,&ch,1); | |
if (!rc) exit(1); | |
send(sid, &ch, 1,0); | |
} else if (FD_ISSET(sid,&readfds)) { // if there are data in sid | |
int rc = read(sid,&ch,1); | |
if (rc > 0) { | |
printf("%c", ch); | |
} | |
else { | |
fprintf(stderr, "exiting remote shell\n"); | |
close(sid); | |
exit(-2); | |
} | |
} | |
} | |
} | |
} |