单个 C 文件实现的 Web 服务器

　2012-11-19 13:15:04　来源：WEB开发网　　　

核心提示：FILE *in = fopen("conf", "rt");// read the first line from the filechar buff[1000];fgets(buff, 1000, in);// close the streamfclose(in);char*

FILE *in = fopen("conf", "rt");
// read the first line from the file
char buff[1000];
fgets(buff, 1000, in);
// close the stream
fclose(in);
char* nl_ptr = strrchr(buff, '\n');
if (nl_ptr != NULL)
*nl_ptr = '\0';
return strdup(buff);
}

/*
Handles php requests
*/
void php_cgi(char* script_path, int fd) {
send_new(fd, "HTTP/1.1 200 OK\n Server: Web Server in C\n Connection: close\n");
dup2(fd, STDOUT_FILENO);
char script[500];
strcpy(script, "SCRIPT_FILENAME=");
strcat(script, script_path);
putenv("GATEWAY_INTERFACE=CGI/1.1");
putenv(script);
putenv("QUERY_STRING=");
putenv("REQUEST_METHOD=GET");
putenv("REDIRECT_STATUS=true");
putenv("SERVER_PROTOCOL=HTTP/1.1");
putenv("REMOTE_HOST=127.0.0.1");
execl("/usr/bin/php-cgi", "php-cgi", NULL);
}

/*
This function parses the HTTP requests,
arrange resource locations,
check for supported media types,
serves files in a web root,
sends the HTTP error codes.
*/
int connection(int fd) {
char request[500], resource[500], *ptr;
int fd1, length;
if (recv_new(fd, request) == 0) {
printf("Recieve Failed\n");
}
printf("%s\n", request);
// Check for a valid browser request
ptr = strstr(request, " HTTP/");
if (ptr == NULL) {
printf("NOT HTTP !\n");
} else {
*ptr = 0;
ptr = NULL;

if (strncmp(request, "GET ", 4) == 0) {
ptr = request + 4;
}
if (ptr == NULL) {
printf("Unknown Request ! \n");
} else {
if (ptr[strlen(ptr) - 1] == '/') {
strcat(ptr, "index.html");
}
strcpy(resource, webroot());
strcat(resource, ptr);
char* s = strchr(ptr, '.');
int i;
for (i = 0; extensions[i].ext != NULL; i++) {
if (strcmp(s + 1, extensions[i].ext) == 0) {
fd1 = open(resource, O_RDONLY, 0);
printf("Opening \"%s\"\n", resource);
if (fd1 == -1) {
printf("404 File not found Error\n");
send_new(fd, "HTTP/1.1 404 Not Found\r\n");
send_new(fd, "Server : Web Server in C\r\n\r\n");
send_new(fd, "<html><head><title>404 Not Found</head></title>");
send_new(fd, "<body><p>404 Not Found: The requested resource could not be found!</p></body></html>");
//Handling php requests
} else if (strcmp(extensions[i].ext, "php