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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT 9000
#define BUF_SIZE 256
static inline void die(const char *msg) {
perror(msg);
exit(-1);
}
int main() {
struct sockaddr_in srv_addr, cli_addr;
int sockopt = 1;
socklen_t sad_sz = sizeof(struct sockaddr_in);
int sfd, cfd;
ssize_t bytes;
char in_buf[BUF_SIZE];
char out_buf[BUF_SIZE];
srv_addr.sin_family = AF_INET;
srv_addr.sin_port = htons(PORT);
srv_addr.sin_addr.s_addr = INADDR_ANY;
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
die("Could not open socket");
setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (char *) &sockopt, sizeof(sockopt));
if (bind(sfd, (struct sockaddr *) &srv_addr, sad_sz) < 0)
die("Could not bind socket");
if (listen(sfd, 1) < 0)
die("Could not listen on socket");
cfd = accept(sfd, (struct sockaddr *) &cli_addr, &sad_sz);
if (cfd < 0)
die("Could not accept incoming connection");
printf("srv: connected: %s\n", inet_ntoa(cli_addr.sin_addr));
while ((bytes = read(cfd, in_buf, BUF_SIZE)) != 0) {
if (bytes < 0)
die("Couldn't receive message");
//printf("srv: %s\n", in_buf);
if (strcmp(in_buf, "get") == 0) {
// TODO: implement get
} else if (strcmp(in_buf, "put") == 0) {
// TODO: implement put
} else if (strcmp(in_buf, "ping") == 0) {
strncpy(out_buf, "pong!", sizeof(out_buf));
} else {
// TODO: connect our shell implementation
memcpy(out_buf, "got: ", sizeof(out_buf));
memcpy(out_buf + sizeof("got: ") - 1, in_buf, BUF_SIZE - sizeof("got: ") + 1);
}
if (write(cfd, out_buf, sizeof(out_buf)) < 0)
die("Couldn't send message");
memset(in_buf, 0, BUF_SIZE);
memset(out_buf, 0, BUF_SIZE);
}
printf("srv: closing down\n");
close(cfd);
close(sfd);
}
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