b7d0d6889d
Stop immediately after responding with status code 304 "Not Modified". This also solves missing log output for status 304. If there is an error while sending a file, try to clean up and close the file.
241 lines
4.9 KiB
C
241 lines
4.9 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <dirent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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#include "http.h"
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#include "resp.h"
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#include "util.h"
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static int
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compareent(const struct dirent **d1, const struct dirent **d2)
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{
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int v;
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v = ((*d2)->d_type == DT_DIR ? 1 : -1) -
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((*d1)->d_type == DT_DIR ? 1 : -1);
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if (v) {
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return v;
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}
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return strcmp((*d1)->d_name, (*d2)->d_name);
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}
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static char *
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suffix(int t)
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{
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switch (t) {
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case DT_FIFO: return "|";
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case DT_DIR: return "/";
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case DT_LNK: return "@";
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case DT_SOCK: return "=";
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}
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return "";
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}
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static void
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html_escape(char *src, char *dst, size_t dst_siz)
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{
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const struct {
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char c;
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char *s;
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} escape[] = {
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{ '&', "&" },
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{ '<', "<" },
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{ '>', ">" },
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{ '"', """ },
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{ '\'', "'" },
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};
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size_t i, j, k, esclen;
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for (i = 0, j = 0; src[i] != '\0'; i++) {
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for (k = 0; k < LEN(escape); k++) {
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if (src[i] == escape[k].c) {
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break;
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}
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}
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if (k == LEN(escape)) {
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/* no escape char at src[i] */
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if (j == dst_siz - 1) {
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/* silent truncation */
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break;
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} else {
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dst[j++] = src[i];
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}
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} else {
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/* escape char at src[i] */
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esclen = strlen(escape[k].s);
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if (j >= dst_siz - esclen) {
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/* silent truncation */
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break;
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} else {
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memcpy(&dst[j], escape[k].s, esclen);
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j += esclen;
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}
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}
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}
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dst[j] = '\0';
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}
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enum status
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resp_dir(int fd, char *name, struct request *r)
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{
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struct dirent **e;
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size_t i;
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int dirlen, s;
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static char t[TIMESTAMP_LEN];
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char esc[PATH_MAX /* > NAME_MAX */ * 6]; /* strlen("&...;") <= 6 */
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/* read directory */
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if ((dirlen = scandir(name, &e, NULL, compareent)) < 0) {
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return http_send_status(fd, S_FORBIDDEN);
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}
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/* send header as late as possible */
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if (dprintf(fd,
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"HTTP/1.1 %d %s\r\n"
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"Date: %s\r\n"
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"Connection: close\r\n"
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"Content-Type: text/html; charset=utf-8\r\n"
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"\r\n",
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S_OK, status_str[S_OK], timestamp(time(NULL), t)) < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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if (r->method == M_GET) {
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/* listing header */
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html_escape(name, esc, sizeof(esc));
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if (dprintf(fd,
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"<!DOCTYPE html>\n<html>\n\t<head>"
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"<title>Index of %s</title></head>\n"
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"\t<body>\n\t\t<a href=\"..\">..</a>",
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esc) < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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/* listing */
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for (i = 0; i < (size_t)dirlen; i++) {
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/* skip hidden files, "." and ".." */
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if (e[i]->d_name[0] == '.') {
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continue;
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}
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/* entry line */
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html_escape(e[i]->d_name, esc, sizeof(esc));
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if (dprintf(fd, "<br />\n\t\t<a href=\"%s%s\">%s%s</a>",
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esc,
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(e[i]->d_type == DT_DIR) ? "/" : "",
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esc,
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suffix(e[i]->d_type)) < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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}
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/* listing footer */
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if (dprintf(fd, "\n\t</body>\n</html>\n") < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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}
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s = S_OK;
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cleanup:
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while (dirlen--) {
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free(e[dirlen]);
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}
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free(e);
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return s;
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}
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enum status
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resp_file(int fd, char *name, struct request *r, struct stat *st, char *mime,
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off_t lower, off_t upper)
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{
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FILE *fp;
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enum status s;
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ssize_t bread, bwritten;
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off_t remaining;
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int range;
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static char buf[BUFSIZ], *p, t1[TIMESTAMP_LEN], t2[TIMESTAMP_LEN];
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/* open file */
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if (!(fp = fopen(name, "r"))) {
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s = http_send_status(fd, S_FORBIDDEN);
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goto cleanup;
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}
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/* seek to lower bound */
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if (fseek(fp, lower, SEEK_SET)) {
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s = http_send_status(fd, S_INTERNAL_SERVER_ERROR);
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goto cleanup;
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}
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/* send header as late as possible */
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range = r->field[REQ_RANGE][0];
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s = range ? S_PARTIAL_CONTENT : S_OK;
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if (dprintf(fd,
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"HTTP/1.1 %d %s\r\n"
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"Date: %s\r\n"
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"Connection: close\r\n"
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"Last-Modified: %s\r\n"
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"Content-Type: %s\r\n"
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"Content-Length: %zu\r\n",
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s, status_str[s], timestamp(time(NULL), t1),
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timestamp(st->st_mtim.tv_sec, t2), mime,
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upper - lower + 1) < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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if (range) {
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if (dprintf(fd, "Content-Range: bytes %zd-%zd/%zu\r\n",
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lower, upper + (upper < 0), st->st_size) < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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}
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if (dprintf(fd, "\r\n") < 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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if (r->method == M_GET) {
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/* write data until upper bound is hit */
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remaining = upper - lower + 1;
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while ((bread = fread(buf, 1, MIN(sizeof(buf),
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(size_t)remaining), fp))) {
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if (bread < 0) {
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s = S_INTERNAL_SERVER_ERROR;
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goto cleanup;
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}
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remaining -= bread;
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p = buf;
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while (bread > 0) {
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bwritten = write(fd, p, bread);
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if (bwritten <= 0) {
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s = S_REQUEST_TIMEOUT;
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goto cleanup;
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}
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bread -= bwritten;
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p += bwritten;
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}
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}
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}
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cleanup:
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if (fp) {
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fclose(fp);
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}
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return s;
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}
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