paulbarbu/main.c

## main.c
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define ERR(s, f) do { perror(s); if(f) exit(1); } while(0)

const char *resp200 = "HTTP/1.1 200 OK\r\n"
                      "Content-Type: text/html; charset=utf-8\r\n\r\n"
                      "<!DOCTYPE html><html><head><meta charset=\"utf8\">"
                      "<title>Mini Server</title></head><body><h1>"
                      "Hello mini-server world!</h1></body></html>";

const char *resp501 = "HTTP/1.1 501 Not Implemented\r\n\r\n"
                      "501 Not Implemented";

const char *req = "GET / HTTP/1.1\r\n"
                  "Host: localhost:4321";

int main() {
    char buf[1024];
    memset(buf, 1024, 0);

    int server = socket(AF_INET, SOCK_STREAM, 0);
    if(-1 == server) ERR("socket", 1);

    const int val = 1;
    if(-1 == setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val))) ERR("setsockopt", 1);

    struct sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    addr.sin_port = htons(4321);

    if(-1 == bind(server, (struct sockaddr *)&addr, sizeof(struct sockaddr_in))) ERR("bind", 1);

    if(-1 == listen(server, 1)) ERR("listen", 1);

    do {
        int client = accept(server, 0, 0);

        if(-1 == client) ERR("accept", 0);

        if(-1 == read(client, buf, 1024)) ERR("read", 0);

        const char *r;
        int size = 0;
        if(NULL != strstr(buf, req))
        {
            r = resp200;
            size = strlen(resp200);
        }
        else
        {
            r = resp501;
            size = strlen(resp501);
        }

        if(-1 == write(client, r, size)) ERR("write", 0);

        if(-1 == close(client)) ERR("close", 0);

    } while(1);

    return shutdown(server, 2);
}
	#include <stdlib.h>
	#include <string.h>
	#include <sys/socket.h>
	#include <netinet/in.h>

	#define ERR(s, f) do { perror(s); if(f) exit(1); } while(0)

	const char *resp200 = "HTTP/1.1 200 OK\r\n"
	"Content-Type: text/html; charset=utf-8\r\n\r\n"
	"<!DOCTYPE html><html><head><meta charset=\"utf8\">"
	"<title>Mini Server</title></head><body><h1>"
	"Hello mini-server world!</h1></body></html>";

	const char *resp501 = "HTTP/1.1 501 Not Implemented\r\n\r\n"
	"501 Not Implemented";

	const char *req = "GET / HTTP/1.1\r\n"
	"Host: localhost:4321";

	int main() {
	char buf[1024];
	memset(buf, 1024, 0);

	int server = socket(AF_INET, SOCK_STREAM, 0);
	if(-1 == server) ERR("socket", 1);

	const int val = 1;
	if(-1 == setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val))) ERR("setsockopt", 1);

	struct sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	addr.sin_port = htons(4321);

	if(-1 == bind(server, (struct sockaddr *)&addr, sizeof(struct sockaddr_in))) ERR("bind", 1);

	if(-1 == listen(server, 1)) ERR("listen", 1);

	do {
	int client = accept(server, 0, 0);

	if(-1 == client) ERR("accept", 0);

	if(-1 == read(client, buf, 1024)) ERR("read", 0);

	const char *r;
	int size = 0;
	if(NULL != strstr(buf, req))
	{
	r = resp200;
	size = strlen(resp200);
	}
	else
	{
	r = resp501;
	size = strlen(resp501);
	}

	if(-1 == write(client, r, size)) ERR("write", 0);

	if(-1 == close(client)) ERR("close", 0);

	} while(1);

	return shutdown(server, 2);
	}