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/* $OpenBSD: server_file.c,v 1.8 2014/07/23 21:43:12 reyk Exp $ */
/*
* Copyright (c) 2006 - 2014 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/tree.h>
#include <sys/hash.h>
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <err.h>
#include <event.h>
#include <openssl/ssl.h>
#include "httpd.h"
#include "http.h"
int server_file_access(struct http_descriptor *, char *, size_t,
struct stat *);
void server_file_error(struct bufferevent *, short, void *);
int
server_file_access(struct http_descriptor *desc, char *path, size_t len,
struct stat *st)
{
errno = 0;
if (access(path, R_OK) == -1) {
goto fail;
} else if (stat(path, st) == -1) {
goto fail;
} else if (S_ISDIR(st->st_mode)) {
/* XXX Should we support directory listing? */
if (!len) {
/* Recursion - the index "file" is a directory? */
errno = EACCES;
goto fail;
}
/* Redirect to path with trailing "/" */
if (path[strlen(path) - 1] != '/') {
/* Remove the document root to get the relative URL */
if (canonicalize_path(NULL,
desc->http_path, path, len) == NULL ||
strlcat(path, "/", len) >= len) {
errno = EINVAL;
goto fail;
}
/* Indicate that the file has been moved */
return (301);
}
/* Otherwise append the default index file */
if (strlcat(path, HTTPD_INDEX, len) >= len) {
errno = EACCES;
goto fail;
}
/* Check again but set len to 0 to avoid recursion */
return (server_file_access(desc, path, 0, st));
} else if (!S_ISREG(st->st_mode)) {
/* Don't follow symlinks and ignore special files */
errno = EACCES;
goto fail;
}
return (0);
fail:
switch (errno) {
case ENOENT:
return (404);
case EACCES:
return (403);
default:
return (500);
}
/* NOTREACHED */
}
int
server_file(struct httpd *env, struct client *clt)
{
struct http_descriptor *desc = clt->clt_desc;
struct server *srv = clt->clt_server;
struct media_type *media;
const char *errstr = NULL;
int fd = -1, ret;
char path[MAXPATHLEN];
struct stat st;
if (canonicalize_path(HTTPD_DOCROOT,
desc->http_path, path, sizeof(path)) == NULL) {
/* Do not echo the uncanonicalized path */
server_abort_http(clt, 500, "invalid request path");
return (-1);
}
/* Returns HTTP status code on error */
if ((ret = server_file_access(desc, path, sizeof(path), &st)) != 0) {
server_abort_http(clt, ret, path);
return (-1);
}
/* Now open the file, should be readable or we have another problem */
if ((fd = open(path, O_RDONLY)) == -1)
goto fail;
/* File descriptor is opened, decrement inflight counter */
server_inflight_dec(clt, __func__);
media = media_find(env->sc_mediatypes, path);
ret = server_response_http(clt, 200, media, st.st_size);
switch (ret) {
case -1:
goto fail;
case 0:
/* Connection is already finished */
close(fd);
return (0);
default:
break;
}
clt->clt_fd = fd;
if (clt->clt_file != NULL)
bufferevent_free(clt->clt_file);
clt->clt_file = bufferevent_new(clt->clt_fd, server_read,
server_write, server_file_error, clt);
if (clt->clt_file == NULL) {
errstr = "failed to allocate file buffer event";
goto fail;
}
bufferevent_settimeout(clt->clt_file,
srv->srv_conf.timeout.tv_sec, srv->srv_conf.timeout.tv_sec);
bufferevent_enable(clt->clt_file, EV_READ);
bufferevent_disable(clt->clt_bev, EV_READ);
return (0);
fail:
if (errstr == NULL)
errstr = strerror(errno);
server_abort_http(clt, 500, errstr);
return (-1);
}
void
server_file_error(struct bufferevent *bev, short error, void *arg)
{
struct client *clt = arg;
struct evbuffer *dst;
if (error & EVBUFFER_TIMEOUT) {
server_close(clt, "buffer event timeout");
return;
}
if (error & (EVBUFFER_READ|EVBUFFER_WRITE|EVBUFFER_EOF)) {
bufferevent_disable(bev, EV_READ);
clt->clt_done = 1;
dst = EVBUFFER_OUTPUT(clt->clt_bev);
if (EVBUFFER_LENGTH(dst)) {
/* Finish writing all data first */
bufferevent_enable(clt->clt_bev, EV_WRITE);
return;
}
if (clt->clt_persist) {
/* Close input file and wait for next HTTP request */
if (clt->clt_fd != -1)
close(clt->clt_fd);
clt->clt_fd = -1;
clt->clt_toread = TOREAD_HTTP_HEADER;
server_reset_http(clt);
bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
return;
}
server_close(clt, "done");
return;
}
if (error & EVBUFFER_ERROR && errno == EFBIG) {
bufferevent_enable(bev, EV_READ);
return;
}
server_close(clt, "buffer event error");
return;
}
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