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libuhttpd/src/file.c

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/*
* MIT License
*
* Copyright (c) 2019 Jianhui Zhao <zhaojh329@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _DEFAULT_SOURCE
#define _XOPEN_SOURCE
#define _FILE_OFFSET_BITS 64
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <fcntl.h>
#include <inttypes.h>
#include <ctype.h>
#include "uhttpd_internal.h"
#include "mimetypes.h"
#include "utils.h"
#include "file.h"
static const char *file_mktag(struct stat *s, char *buf, int len)
{
snprintf(buf, len, "\"%" PRIx64 "-%" PRIx64 "-%" PRIx64 "\"",
(uint64_t)s->st_ino, (uint64_t)s->st_size, (uint64_t)s->st_mtime);
return buf;
}
static char *unix2date(time_t ts, char *buf, int len)
{
struct tm *t = gmtime(&ts);
strftime(buf, len, "%a, %d %b %Y %H:%M:%S GMT", t);
return buf;
}
static time_t date2unix(const struct uh_str date)
{
struct tm t;
char buf[128] = "";
memset(&t, 0, sizeof(t));
strncpy(buf, date.p, date.len);
if (strptime(buf, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL)
return timegm(&t);
return 0;
}
static void file_response_ok_hdrs(struct uh_connection *conn, struct stat *s)
{
char buf[128];
if (s) {
conn->printf(conn, "ETag: %s\r\n", file_mktag(s, buf, sizeof(buf)));
conn->printf(conn, "Last-Modified: %s\r\n", unix2date(s->st_mtime, buf, sizeof(buf)));
}
conn->printf(conn, "Date: %s\r\n", unix2date(time(NULL), buf, sizeof(buf)));
}
static void file_response_304(struct uh_connection *conn, struct stat *s)
{
conn->send_status_line(conn, HTTP_STATUS_NOT_MODIFIED, NULL);
file_response_ok_hdrs(conn, s);
}
static bool file_if_modified_since(struct uh_connection *conn, struct stat *s)
{
const struct uh_str hdr = conn->get_header(conn, "If-Modified-Since");
if (!hdr.p)
return true;
if (date2unix(hdr) >= s->st_mtime) {
file_response_304(conn, s);
return false;
}
return true;
}
static bool file_if_range(struct uh_connection *conn, struct stat *s)
{
const struct uh_str hdr = conn->get_header(conn, "If-Range");
if (hdr.p) {
conn->error(conn, HTTP_STATUS_PRECONDITION_FAILED, NULL);
return false;
}
return true;
}
static bool file_if_unmodified_since(struct uh_connection *conn, struct stat *s)
{
const struct uh_str hdr = conn->get_header(conn, "If-Unmodified-Since");
if (hdr.p && date2unix(hdr) <= s->st_mtime) {
conn->error(conn, HTTP_STATUS_PRECONDITION_FAILED, NULL);
return false;
}
return true;
}
static void file_if_gzip(struct uh_connection *conn, const char *path, const char *mime)
{
const struct uh_str hdr = conn->get_header(conn, "Accept-Encoding");
uint8_t magic[2] = {};
int fd;
if (!hdr.p || !memmem(hdr.p, hdr.len, "gzip", 4))
return;
if (strcmp(mime, "text/css") && strcmp(mime, "text/javascript") && strcmp(mime, "text/html"))
return;
fd = open(path, O_RDONLY);
if (read(fd, magic, 2) != 2) {
close(fd);
return;
}
close(fd);
/* gzip magic */
if (magic[0] != 0x1f || magic[1] != 0x8b)
return;
conn->printf(conn, "Content-Encoding: gzip\r\n");
}
static bool file_range(struct uh_connection *conn, uint64_t size, uint64_t *start, uint64_t *end, bool *ranged)
{
struct uh_connection_internal *conni = (struct uh_connection_internal *)conn;
const struct uh_str hdr = conn->get_header(conn, "Range");
int content_length;
const char *reason;
const char *p, *e;
char buf[32];
int i;
*start = 0;
*end = size - 1;
if (!hdr.p) {
*ranged = false;
return true;
}
if (hdr.len < 8)
goto err;
p = hdr.p;
e = hdr.p + hdr.len;
if (strncmp(p, "bytes=", 6))
goto err;
p += 6;
i = 0;
while (p < e) {
if (i >= sizeof(buf) - 1)
goto err;
if (isdigit(*p)) {
buf[i++] = *p++;
continue;
}
if (*p != '-')
goto err;
p++;
buf[i] = '\0';
break;
}
*start = strtoull(buf, NULL, 0);
i = 0;
while (p < e) {
if (i >= (sizeof(buf) - 1) || !isdigit(*p))
goto err;
buf[i++] = *p++;
}
buf[i] = '\0';
*end = strtoull(buf, NULL, 0);
if (*start >= size)
goto err;
if (*end == 0)
*end = size - 1;
if (*end < *start)
goto err;
if (*end > size - 1)
*end = size - 1;
*ranged = true;
return true;
err:
reason = http_status_str(HTTP_STATUS_RANGE_NOT_SATISFIABLE);
content_length = strlen(reason);
conn->send_status_line(conn, HTTP_STATUS_RANGE_NOT_SATISFIABLE, "Content-Type: text/plain\r\nConnection: close\r\n");
conn->printf(conn, "Content-Length: %d\r\n", content_length);
conn->printf(conn, "Content-Range: bytes */%" PRIu64 "\r\n", size);
conn->send(conn, "\r\n", 2);
conn->send(conn, reason, content_length);
conni->flags |= CONN_F_SEND_AND_CLOSE;
conn->done(conn);
return false;
}
void serve_file(struct uh_connection *conn)
{
struct uh_connection_internal *conni = (struct uh_connection_internal *)conn;
const struct uh_str path = conn->get_path(conn);
struct uh_server_internal *srv = conni->srv;
const char *docroot = srv->docroot;
const char *index_page = srv->index_page;
static char fullpath[PATH_MAX];
uint64_t start, end;
int docroot_len;
const char *mime;
struct stat st;
bool ranged;
if (!docroot || !docroot[0])
docroot = ".";
if (!index_page || !index_page[0])
index_page = "index.html";
docroot_len = strlen(docroot);
memcpy(fullpath, docroot, docroot_len);
if (!strncmp(path.p, "/", path.len)) {
fullpath[docroot_len] = '/';
strcpy(fullpath + docroot_len + 1, index_page);
} else if (urldecode(fullpath + docroot_len, PATH_MAX - docroot_len, path.p, path.len) < 0) {
conn->error(conn, HTTP_STATUS_NOT_FOUND, NULL);
return;
}
if (stat(fullpath, &st) < 0) {
int code;
switch (errno) {
case EACCES:
code = HTTP_STATUS_FORBIDDEN;
break;
case ENOENT:
code = HTTP_STATUS_NOT_FOUND;
break;
default:
code = HTTP_STATUS_INTERNAL_SERVER_ERROR;
};
conn->error(conn, code, NULL);
return;
}
if (!S_ISLNK(st.st_mode) && !S_ISREG(st.st_mode)) {
conn->error(conn, 403, NULL);
return;
}
switch (conn->get_method(conn)) {
case HTTP_GET:
case HTTP_HEAD:
break;
default:
conn->error(conn, HTTP_STATUS_METHOD_NOT_ALLOWED, NULL);
return;
}
if (!file_range(conn, st.st_size, &start, &end, &ranged))
return;
if (!file_if_modified_since(conn, &st) ||
!file_if_range(conn, &st) ||
!file_if_unmodified_since(conn, &st)) {
conn->printf(conn, "\r\n");
return;
}
if (ranged)
conn->send_status_line(conn, HTTP_STATUS_PARTIAL_CONTENT, NULL);
else
conn->send_status_line(conn, HTTP_STATUS_OK, NULL);
file_response_ok_hdrs(conn, &st);
mime = file_mime_lookup(fullpath);
conn->printf(conn, "Content-Type: %s\r\n", mime);
conn->printf(conn, "Content-Length: %" PRIu64 "\r\n", end - start + 1);
if (ranged)
conn->printf(conn, "Content-Range: bytes %" PRIu64 "-%" PRIu64 "/%" PRIu64 "\r\n", start, end, (uint64_t)st.st_size);
else
file_if_gzip(conn, fullpath, mime);
conn->printf(conn, "\r\n");
if (conn->get_method(conn) == HTTP_HEAD)
return;
conn->send_file(conn, fullpath, start, end - start + 1);
conn->done(conn);
}
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