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server.c
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#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#define PORT 8888
#define BUFFER_SIZE 1024
int main() {
char buffer[BUFFER_SIZE];
char resp[] = "HTTP/1.0 200 OK\r\n"
"Server: webserver-c\r\n"
"Content-type: text/html\r\n\r\n"
"<html>hello, world</html>\r\n";
// Create a socket
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
perror("webserver (socket)");
return 1;
}
struct sockaddr_in host_addr;
int host_addrlen = sizeof(host_addr);
host_addr.sin_family = AF_INET;
host_addr.sin_port = htons(PORT);
host_addr.sin_addr.s_addr = htonl(INADDR_ANY);
// Create client address
struct sockaddr_in client_addr;
int client_addrlen = sizeof(client_addr);
// Bind the socket to the address
if (bind(sockfd, (struct sockaddr *)&host_addr, host_addrlen) != 0) {
perror("webserver (bind)");
return 1;
}
// Listen for incoming connections
if (listen(sockfd, SOMAXCONN) != 0) {
perror("webserver (listen)");
return 1;
}
printf("server listening for connections\n");
for (;;) {
// Accept incoming connections
int newsockfd = accept(sockfd, (struct sockaddr *)&host_addr,
(socklen_t *)&host_addrlen);
if (newsockfd < 0) {
perror("webserver (accept)");
continue;
}
// Get client address
int sockn = getsockname(newsockfd, (struct sockaddr *)&client_addr,
(socklen_t *)&client_addrlen);
if (sockn < 0) {
perror("webserver (getsockname)");
continue;
}
// Read from the socket
int valread = read(newsockfd, buffer, BUFFER_SIZE);
if (valread < 0) {
perror("webserver (read)");
continue;
}
// Read the request
char method[BUFFER_SIZE], uri[BUFFER_SIZE], version[BUFFER_SIZE];
sscanf(buffer, "%s %s %s", method, uri, version);
printf("[%s:%u] %s %s %s\n", inet_ntoa(client_addr.sin_addr),
ntohs(client_addr.sin_port), method, version, uri);
// Write to the socket
int valwrite = write(newsockfd, resp, strlen(resp));
if (valwrite < 0) {
perror("webserver (write)");
continue;
}
close(newsockfd);
}
return 0;
}