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#include "core.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/sendfile.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <errno.h>
static int tip_client_method_not_found(struct tip_client *cli)
{
/* To meet RFC 7231, this function MUST generate an Allow header field
* containing the correct methods. For example: "Allow: POST\r\n"
*/
char buf[] = "HTTP/1.1 405 Method Not Allowed\r\n"
"Content-Length: 0\r\n\r\n";
send(tip_client_socket(cli), buf, strlen(buf), 0);
return -1;
}
static int tip_client_file_not_found(struct tip_client *cli)
{
char buf[] = "HTTP/1.1 404 Not Found\r\n"
"Content-Length: 0\r\n\r\n";
send(tip_client_socket(cli), buf, strlen(buf), 0);
return -1;
}
/* TODO: sanitize uri, don't escape directory serving files. */
static bool sanitize(const char *uri)
{
return true;
}
#define BLOCK 1024000
int tip_client_state_process_payload(struct tip_client *cli)
{
const char *trailer, *x_redirect;
bool allow_redirect = true;
char _uri[32], *uri = _uri;
char path[PATH_MAX + 1];
char redirect[5];
struct stat st;
int err;
/* syslog(LOG_DEBUG, "%s:rhu %.32s ...\n",
inet_ntoa(cli->addr.sin_addr),
ntohs(cli->addr.sin_port), cli->buf); */
if (!strncmp(cli->buf, "GET", strlen("GET"))) {
cli->method = TIP_METHOD_GET;
if (sscanf(cli->buf, "GET %31s HTTP/1.1", uri) != 1)
return tip_client_method_not_found(cli);
} else if (!strncmp(cli->buf, "HEAD", strlen("HEAD"))) {
cli->method = TIP_METHOD_HEAD;
if (sscanf(cli->buf, "HEAD %31s HTTP/1.1", uri) != 1)
return tip_client_method_not_found(cli);
} else {
return tip_client_method_not_found(cli);
}
x_redirect = strstr(cli->buf, "X-Accept-Redirect: ");
if (x_redirect &&
sscanf(x_redirect, "X-Accept-Redirect: %4s", redirect) == 1 &&
!strncmp(redirect, "off", strlen("off")))
allow_redirect = false;
trailer = strstr(cli->buf, "\r\n\r\n");
if (!sanitize(uri))
return tip_client_method_not_found(cli);
snprintf(path, PATH_MAX, "%s/%s", root, uri);
err = stat(path, &st);
if (err < 0)
return tip_client_file_not_found(cli);
/* skip initial / */
uri++;
cli->uri = strdup(uri);
cli->path = strdup(path);
cli->size = st.st_size;
if (cli->method == TIP_METHOD_HEAD) {
cli->state = TIP_CLIENT_PROCESSING_REQUEST_2;
return 0;
}
if (tip_client_large_file(cli)) {
cli->allow_redirect = allow_redirect;
num_clients++;
if (num_clients > max_clients) {
if (!tip_client_redirect(cli)) {
tip_client_pending(cli);
return 1;
}
}
}
cli->state = TIP_CLIENT_PROCESSING_REQUEST_2;
return 0;
}
int tip_client_state_process_payload_reply(struct tip_client *cli)
{
char buf[1024];
int fd;
if (cli->redirect) {
snprintf(buf, sizeof(buf),
"HTTP/1.1 301 Moves Permanently\r\nLocation: http://%s:%hu/%s\r\n\r\n",
inet_ntoa(cli->redirect_addr.sin_addr),
htons(cli->redirect_addr.sin_port), cli->uri);
send(tip_client_socket(cli), buf, strlen(buf), 0);
return 1;
}
fd = open(cli->path, O_RDONLY);
if (fd < 0)
return tip_client_file_not_found(cli);
snprintf(buf, sizeof(buf),
"HTTP/1.1 200 OK\r\nContent-Length: %lu\r\n\r\n",
cli->size);
send(tip_client_socket(cli), buf, strlen(buf), 0);
cli->fd = fd;
switch (cli->method) {
case TIP_METHOD_GET:
cli->state = TIP_CLIENT_PROCESSING_REQUEST_3;
break;
case TIP_METHOD_HEAD:
/* close connection. */
return 1;
}
return 0;
}
int tip_client_state_process_payload_bulk(struct tip_client *cli)
{
sendfile(tip_client_socket(cli), cli->fd, &cli->offset, BLOCK);
if (cli->offset >= cli->size) {
cli->state = TIP_CLIENT_CLOSE_WAIT;
return 1;
}
return 0;
}
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