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#include "file.h"
#include <errno.h>
#include <linux/limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#define FILE_READBUF_SIZE 1024
static const char *index_names[] = { "index.html", "index.php", NULL };
const char *file_path_for_uri(const char *uri)
{
struct stat statbuf;
char path[PATH_MAX];
size_t result_len;
char *result;
getcwd(path, PATH_MAX);
strncat(path, uri, PATH_MAX - 1);
/* Look for an index file if this is a directory */
stat(path, &statbuf);
if (S_ISDIR(statbuf.st_mode)) {
size_t dir_index = strlen(path);
for (int i = 0; index_names[i] != NULL; i++) {
strcat(path, index_names[i]);
if (access(path, F_OK) == 0) {
/* We found an index file. */
break;
}
/* Put the null terminator back where it was and try
* again with a different file name. */
path[dir_index] = '\0';
}
}
/* Allocate a string with only the needed size */
result_len = strlen(path);
result = malloc(result_len + 1);
memcpy(result, path, result_len);
result[result_len] = '\0';
return result;
}
enum serve_method file_method_for_path(const char *filepath, enum http_res_code *code)
{
struct stat statbuf;
if (access(filepath, F_OK) != 0) {
*code = HTTP_RESPONSE_NOTFOUND;
return SERVE_METHOD_ERROR;
}
*code = HTTP_RESPONSE_OK;
if (strstr(filepath, ".php") != 0)
return SERVE_METHOD_PHP;
stat(filepath, &statbuf);
if (statbuf.st_mode & S_IXUSR) {
return SERVE_METHOD_CGI;
}
return SERVE_METHOD_FILE;
}
static const char *mime_type_for_path(const char *filepath)
{
const char *ext = strrchr(filepath, '.');
if (ext == NULL)
return "text/plain";
if (strcmp(ext, ".html") == 0)
return "text/html";
if (strcmp(ext, ".css") == 0)
return "text/css";
if (strcmp(ext, ".js") == 0)
return "text/javascript";
if (strcmp(ext, ".png") == 0)
return "image/png";
if (strcmp(ext, ".gif") == 0)
return "image/gif";
if (strcmp(ext, ".jpg") == 0 || strcmp(ext, ".jpeg") == 0)
return "image/jpeg";
if (strcmp(ext, ".webp") == 0)
return "image/webp";
return "text/plain";
}
int file_read(const char *filepath, int sockfd)
{
FILE *fp;
char buffer[FILE_READBUF_SIZE];
const char *mime_type;
size_t bytes_read;
fp = fopen(filepath, "rb");
if (fp == NULL) {
perror("Failed to open file");
return 1;
}
mime_type = mime_type_for_path(filepath);
write(sockfd, "Content-Type: ", 14);
write(sockfd, mime_type, strlen(mime_type));
write(sockfd, "\r\n\r\n", 4);
while ((bytes_read = fread(buffer, 1, FILE_READBUF_SIZE, fp)) > 0)
write(sockfd, buffer, bytes_read);
fclose(fp);
return 0;
}
static void cgi_setup_env(const char *filepath, const struct http_request *req)
{
if (req->method == HTTP_METHOD_GET) {
setenv("REQUEST_METHOD", "GET", 1);
} else if (req->method == HTTP_METHOD_POST) {
setenv("REQUEST_METHOD", "POST", 1);
}
setenv("SCRIPT_FILENAME", filepath, 1);
if (req->query_str)
setenv("QUERY_STRING", req->query_str, 1);
if (req->cookie)
setenv("HTTP_COOKIE", req->cookie, 1);
if (req->body) {
static char intbuf[20];
static char *content_type = "application/x-www-form-urlencoded";
sprintf(intbuf, "%ld", strlen(req->body));
setenv("CONTENT_LENGTH", intbuf, 1);
setenv("CONTENT_TYPE", content_type, strlen(content_type));
}
}
int file_read_cgi(const char *filepath, const char *program, const struct http_request *req, int sockfd)
{
int readfds[2];
int writefds[2];
pid_t pid;
char buffer[FILE_READBUF_SIZE];
size_t bytes_read;
cgi_setup_env(filepath, req);
/* Create pipes for reading from and writing to the child process. */
if (pipe(readfds) == -1) {
perror("read pipe");
return 1;
}
if (req->body && pipe(writefds) == -1) {
perror("write pipe");
return 1;
}
pid = fork();
if (pid == -1) {
perror("fork");
return 1;
}
if (pid == 0) {
close(readfds[0]);
if (readfds[1] != STDOUT_FILENO) {
dup2(readfds[1], STDOUT_FILENO);
close(readfds[1]);
}
if (req->body != NULL) {
close(writefds[1]);
if (writefds[0] != STDIN_FILENO) {
dup2(writefds[0], STDIN_FILENO);
close(writefds[0]);
}
}
execl(program, program, NULL);
/* We should only end up here if there's an error. */
perror("exec");
exit(1);
}
close(readfds[1]);
if (req->body != NULL) {
/* Write to stdin of child process. */
close(writefds[0]);
write(writefds[1], req->body, strlen(req->body) + 1);
}
/* Read its output from stdout. */
while ((bytes_read = read(readfds[0], buffer, FILE_READBUF_SIZE)) > 0)
write(sockfd, buffer, bytes_read);
unsetenv("QUERY_STRING");
unsetenv("HTTP_COOKIE");
unsetenv("CONTENT");
unsetenv("CONTENT_LENGTH");
close(readfds[0]);
close(writefds[1]);
return 0;
}
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