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hacky_ws.c
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#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#define MAX_BUFFER 500
#define HTTP_PORT 8080
#define BACKLOG 20
int create_server(void)
{
struct sockaddr_in server_address;
int server, reuse = 1;
memset(&server_address, 0, sizeof(server_address));
server_address.sin_family = AF_INET;
server_address.sin_port = htons(HTTP_PORT);
server_address.sin_addr.s_addr = INADDR_ANY; // any address
server = socket(AF_INET, SOCK_STREAM, 0);
if (server < 0) {
return server;
}
setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
if (bind(server, (struct sockaddr *)&server_address,
sizeof(server_address)) < 0) {
return -1;
}
if (listen(server, BACKLOG) < 0) {
return -1;
}
return server;
}
int accept_client(int server)
{
while (1) {
int client = accept(server, NULL, NULL);
if (client < 0 && errno != EINTR) {
return -1;
} else if (client < 0 && errno == EINTR) {
continue;
}
return client;
}
}
void get_line(int client, char *buffer)
{
char c = 0;
printf("getline\n");
while (c != '\n') {
if (recv(client, &c, 1, 0) < 0) {
return;
}
*buffer++ = c;
}
}
void handle_get(char * buffer, int client)
{
unsigned long length = 0;
char response_buffer[MAX_BUFFER];
char *query = buffer + 3;
while (isspace(*query)) {
query++;
}
if (*query == '/' && isspace(*(query + 1))) {
sprintf(response_buffer, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n");
printf("%s\n", response_buffer);
write(client, response_buffer, strlen(response_buffer));
strcpy(buffer,
"<html><body><form action=\"/\" method=\"post\">"
"<textarea id=\"data\" name=\"data\"></textarea>"
"<input type=\"submit\" value=\"Go\" /></form>"
"</body></html>");
printf("%s\n", buffer);
length = strlen(buffer);
sprintf(response_buffer, "Content-Length: %lu\r\n\r\n", length);
write(client, response_buffer, strlen(response_buffer));
write(client, buffer, length);
} else {
printf("404\n");
sprintf(buffer, "HTTP/1.0 404 Not Found\r\n\r\n");
write(client, buffer, strlen(buffer));
}
}
void handle_post(char * buffer, int client)
{
char response_buffer[MAX_BUFFER];
unsigned long length = 0;
char *location = 0;
printf("post");
while (!location) {
get_line(client, buffer);
printf("%s\n", buffer);
if (strncasecmp("Content-Length:", buffer, 15) == 0) {
length = strtoul(buffer + 15, NULL, 0);
printf("Length: %lu\n", length);
}
if (strncmp("\r\n", buffer, 2) == 0) {
if (length == 0) {
break;
}
read(client, buffer, length);
location = strstr(buffer, "data=");
}
}
if (location == 0) {
sprintf(buffer, "HTTP/1.0 400 Bad Request\r\n\r\n");
write(client, buffer, strlen(buffer));
return;
}
printf("got data");
*(location + length) = 0; // make C string
sprintf(response_buffer, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n");
write(client, response_buffer, strlen(response_buffer));
sprintf(response_buffer, "<html><body><p>%s</p></body></html>", location + 5);
write(client, response_buffer, strlen(response_buffer));
}
void handle_client(int client)
{
char buffer[MAX_BUFFER];
memset(buffer, 0, MAX_BUFFER);
get_line(client, buffer);
printf("%p\n", buffer);
if (strncmp(buffer, "GET", 3) == 0) {
handle_get(buffer, client);
} else if (strncmp(buffer, "POST", 4) == 0) {
handle_post(buffer, client);
} else {
sprintf(buffer, "HTTP/1.0 501 Not Implemented\r\n\r\n");
write(client, buffer, strlen(buffer));
}
}
int main(int argc, char **argv)
{
int server = create_server();
if (server < 0) {
perror("create_server");
return EXIT_FAILURE;
}
while (1) {
int child;
int client = accept_client(server);
printf("client\n");
#ifndef DEBUG
if ((child = fork()) < 0) {
perror("fork");
return EXIT_FAILURE;
} else if (child == 0) {
#endif
printf("in child\n");
handle_client(client);
close(client);
#ifndef DEBUG
return 0;
} else {
close(client);
}
#endif
}
}