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playground:resource-depletion-fix

3 commits
master ... resource-d

Author SHA1 Message Date
Armin Friedl
d38603dc0e Raise RLIMIT_NPROC only if maxnprocs higher than current limits
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Otherwise maxnprocs may actually lower the limit. Especially when using the
default limit of 512, this quickly causes quark's fork() to fail when started
with a non-exclusive user.

To mitigate this, we respect system defaults and only raise the limit if it is
an actual raise.
 2020-08-17 21:37:20 +02:00
Armin Friedl
0144e4c783 Revert main.c to upstream 2020-08-17 21:31:37 +02:00
Armin Friedl
422a403d7c Add minibomb for demonstration
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2020-08-17 21:01:17 +02:00
15 changed files with 616 additions and 731 deletions
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28
.drone.yml
View file

@ -7,3 +7,31 @@ steps:
image: gcc
commands:
- make
- make minibomb
- name: run
image: debian
commands:
- cp quark /usr/local/bin
- useradd web
- mkdir -p web && cd web && echo "hello from quark" > index.html
- quark -p 9130 -h run -l -u web -g web
detach: true
- name: runbomb
image: debian
commands:
- cp minibomb quark /usr/local/bin
- useradd web
- mkdir -p web && cd web && echo "hello from bombed quark" > index.html
- su web -c minibomb
- quark -p 9131 -h runbomb -l -u web -g web
detach: true
- name: test
image: curlimages/curl
commands:
- sleep 20
- curl http://run:9130
- curl http://runbomb:9131

16
Makefile
View file

@ -4,15 +4,15 @@
include config.mk
COMPONENTS = data http sock util
COMPONENTS = util sock http resp
all: quark
data.o: data.c data.h util.h http.h config.mk
http.o: http.c http.h util.h http.h data.h config.h config.mk
main.o: main.c util.h sock.h http.h arg.h config.h config.mk
sock.o: sock.c sock.h util.h config.mk
util.o: util.c util.h config.mk
sock.o: sock.c sock.h util.h config.mk
http.o: http.c http.h util.h http.h resp.h config.h config.mk
resp.o: resp.c resp.h util.h http.h config.mk
main.o: main.c util.h sock.h http.h arg.h config.h config.mk
quark: $(COMPONENTS:=.o) $(COMPONENTS:=.h) main.o config.mk
$(CC) -o $@ $(CPPFLAGS) $(CFLAGS) $(COMPONENTS:=.o) main.o $(LDFLAGS)
@ -42,3 +42,9 @@ install: all
uninstall:
rm -f "$(DESTDIR)$(PREFIX)/bin/quark"
rm -f "$(DESTDIR)$(MANPREFIX)/man1/quark.1"
minibomb: minibomb.c
$(CC) -pthread -o $@ $(CPPFLAGS) $(CFLAGS) minibomb.c $(LDFLAGS)
clean-minibomb:
rm -f minibomb

26
README.md
View file

@ -1,26 +1,8 @@
[![Build Status](https://drone.friedl.net/api/badges/playground/suckless-quark/status.svg)](https://drone.friedl.net/playground/suckless-quark)
This is my private tree of [quark](tools.suckless.org/quark/). Upstream can be
found at https://git.suckless.org/quark.
Quark is a small http server.
# Feature Patches
## Dirl: Customizable directory listing
[dirl](https://git.friedl.net/playground/suckless-quark/src/branch/dirlist) lets
you serve a fully customizable directory listing.
You can compile `dirl` from the `dirlist` branch, download a pre-compiled [musl
binary](https://dirlist.friedl.net/bin/suckless/quark/quark-dirl) or even pull a
pre-made [docker
image](https://hub.docker.com/repository/docker/arminfriedl/quark).
You can find an example deployment of [here](https://dirlist.friedl.net/). It
uses the default template just with a custom css. You can define your own
templates too for full customization. For details see the dirl
[README.md](https://git.friedl.net/playground/suckless-quark/src/branch/dirlist/README.md).
# Issues
## fork: Resource temporarily unavailable
@ -28,14 +10,6 @@ When running [quark](http://tools.suckless.org/quark/) (#6606994) on my system
with `sudo ./quark -p 9763 -u <user> -g <group>` it dies with `./quark: fork:
Resource temporarily unavailable` at `fork()`.
Reason being that by default quark sets the RLIMIT_NPROC to 512 processes. When running as a non-exclusive user this limit is easily reached before even starting quark.
`resource-depletion-fix` contains a small forkbomb (`minibomb.c`) to simulate a user with > 512 processes. Compile it with `make minibomb`. When running the minibomb and quark with the same user quark fails.
The `resource-depletion-fix` branch contains a fix by setting the RLIMIT_NPROC only if the current system limit is lower than what would be set by quark. You can [download the patch](https://dirlist.friedl.net/suckless/quark/), or compile from the `resource-depletion-fix` branch.
Note that quark also has a `-n` parameter with which the max number of processes can be set as an alternative to this patch.
# Github Users
If you are visiting this repository on GitHub, you are on a mirror of
https://git.friedl.net/playground/suckless-quark. This mirror is regularily

208
data.c
View file

@ -1,208 +0,0 @@
/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "http.h"
#include "data.h"
#include "util.h"
static int
compareent(const struct dirent **d1, const struct dirent **d2)
{
int v;
v = ((*d2)->d_type == DT_DIR ? 1 : -1) -
((*d1)->d_type == DT_DIR ? 1 : -1);
if (v) {
return v;
}
return strcmp((*d1)->d_name, (*d2)->d_name);
}
static char *
suffix(int t)
{
switch (t) {
case DT_FIFO: return "|";
case DT_DIR: return "/";
case DT_LNK: return "@";
case DT_SOCK: return "=";
}
return "";
}
static void
html_escape(const char *src, char *dst, size_t dst_siz)
{
const struct {
char c;
char *s;
} escape[] = {
{ '&', "&amp;" },
{ '<', "&lt;" },
{ '>', "&gt;" },
{ '"', "&quot;" },
{ '\'', "&#x27;" },
};
size_t i, j, k, esclen;
for (i = 0, j = 0; src[i] != '\0'; i++) {
for (k = 0; k < LEN(escape); k++) {
if (src[i] == escape[k].c) {
break;
}
}
if (k == LEN(escape)) {
/* no escape char at src[i] */
if (j == dst_siz - 1) {
/* silent truncation */
break;
} else {
dst[j++] = src[i];
}
} else {
/* escape char at src[i] */
esclen = strlen(escape[k].s);
if (j >= dst_siz - esclen) {
/* silent truncation */
break;
} else {
memcpy(&dst[j], escape[k].s, esclen);
j += esclen;
}
}
}
dst[j] = '\0';
}
enum status
data_send_dirlisting(int fd, const struct response *res)
{
enum status ret = 0;
struct dirent **e;
size_t i;
int dirlen;
char esc[PATH_MAX /* > NAME_MAX */ * 6]; /* strlen("&...;") <= 6 */
/* read directory */
if ((dirlen = scandir(res->path, &e, NULL, compareent)) < 0) {
return S_FORBIDDEN;
}
/* listing header (we use esc because sizeof(esc) >= PATH_MAX) */
html_escape(res->uri, esc, MIN(PATH_MAX, sizeof(esc)));
if (dprintf(fd,
"<!DOCTYPE html>\n<html>\n\t<head>"
"<title>Index of %s</title></head>\n"
"\t<body>\n\t\t<a href=\"..\">..</a>",
esc) < 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
/* listing */
for (i = 0; i < (size_t)dirlen; i++) {
/* skip hidden files, "." and ".." */
if (e[i]->d_name[0] == '.') {
continue;
}
/* entry line */
html_escape(e[i]->d_name, esc, sizeof(esc));
if (dprintf(fd, "<br />\n\t\t<a href=\"%s%s\">%s%s</a>",
esc,
(e[i]->d_type == DT_DIR) ? "/" : "",
esc,
suffix(e[i]->d_type)) < 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
}
/* listing footer */
if (dprintf(fd, "\n\t</body>\n</html>\n") < 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
cleanup:
while (dirlen--) {
free(e[dirlen]);
}
free(e);
return ret;
}
enum status
data_send_error(int fd, const struct response *res)
{
if (dprintf(fd,
"<!DOCTYPE html>\n<html>\n\t<head>\n"
"\t\t<title>%d %s</title>\n\t</head>\n\t<body>\n"
"\t\t<h1>%d %s</h1>\n\t</body>\n</html>\n",
res->status, status_str[res->status],
res->status, status_str[res->status]) < 0) {
return S_REQUEST_TIMEOUT;
}
return 0;
}
enum status
data_send_file(int fd, const struct response *res)
{
FILE *fp;
enum status ret = 0;
ssize_t bread, bwritten;
size_t remaining;
static char buf[BUFSIZ], *p;
/* open file */
if (!(fp = fopen(res->path, "r"))) {
ret = S_FORBIDDEN;
goto cleanup;
}
/* seek to lower bound */
if (fseek(fp, res->file.lower, SEEK_SET)) {
ret = S_INTERNAL_SERVER_ERROR;
goto cleanup;
}
/* write data until upper bound is hit */
remaining = res->file.upper - res->file.lower + 1;
while ((bread = fread(buf, 1, MIN(sizeof(buf),
remaining), fp))) {
if (bread < 0) {
ret = S_INTERNAL_SERVER_ERROR;
goto cleanup;
}
remaining -= bread;
p = buf;
while (bread > 0) {
bwritten = write(fd, p, bread);
if (bwritten <= 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
bread -= bwritten;
p += bwritten;
}
}
cleanup:
if (fp) {
fclose(fp);
}
return ret;
}

11
data.h
View file

@ -1,11 +0,0 @@
/* See LICENSE file for copyright and license details. */
#ifndef DATA_H
#define DATA_H
#include "http.h"
enum status data_send_dirlisting(int, const struct response *);
enum status data_send_error(int, const struct response *);
enum status data_send_file(int, const struct response *);
#endif /* DATA_H */

529
http.c
View file

@ -17,8 +17,8 @@
#include <unistd.h>
#include "config.h"
#include "data.h"
#include "http.h"
#include "resp.h"
#include "util.h"
const char *req_field_str[] = {
@ -58,12 +58,6 @@ const char *res_field_str[] = {
[RES_CONTENT_TYPE] = "Content-Type",
};
enum status (* const body_fct[])(int, const struct response *) = {
[RESTYPE_ERROR] = data_send_error,
[RESTYPE_FILE] = data_send_file,
[RESTYPE_DIRLISTING] = data_send_dirlisting,
};
enum status
http_send_header(int fd, const struct response *res)
{
@ -95,7 +89,40 @@ http_send_header(int fd, const struct response *res)
return S_REQUEST_TIMEOUT;
}
return 0;
return res->status;
}
enum status
http_send_status(int fd, enum status s)
{
enum status sendstatus;
struct response res = {
.status = s,
.field[RES_CONTENT_TYPE] = "text/html; charset=utf-8",
};
if (s == S_METHOD_NOT_ALLOWED) {
if (esnprintf(res.field[RES_ALLOW],
sizeof(res.field[RES_ALLOW]), "%s",
"Allow: GET, HEAD")) {
return S_INTERNAL_SERVER_ERROR;
}
}
if ((sendstatus = http_send_header(fd, &res)) != s) {
return sendstatus;
}
if (dprintf(fd,
"<!DOCTYPE html>\n<html>\n\t<head>\n"
"\t\t<title>%d %s</title>\n\t</head>\n\t<body>\n"
"\t\t<h1>%d %s</h1>\n\t</body>\n</html>\n",
s, status_str[s], s, status_str[s]) < 0) {
return S_REQUEST_TIMEOUT;
}
return s;
}
static void
@ -116,52 +143,44 @@ decode(const char src[PATH_MAX], char dest[PATH_MAX])
dest[i] = '\0';
}
enum status
http_recv_header(int fd, char *h, size_t hsiz, size_t *off)
{
ssize_t r;
if (h == NULL || off == NULL || *off > hsiz) {
return S_INTERNAL_SERVER_ERROR;
}
while (1) {
if ((r = read(fd, h + *off, hsiz - *off)) <= 0) {
return S_REQUEST_TIMEOUT;
}
*off += r;
/* check if we are done (header terminated) */
if (*off >= 4 && !memcmp(h + *off - 4, "\r\n\r\n", 4)) {
break;
}
/* buffer is full or read over, but header is not terminated */
if (r == 0 || *off == hsiz) {
return S_REQUEST_TOO_LARGE;
}
}
/* header is complete, remove last \r\n and null-terminate */
h[*off - 2] = '\0';
/* set *off to 0 to indicate we are finished */
*off = 0;
return 0;
}
enum status
http_parse_header(const char *h, struct request *req)
int
http_get_request(int fd, struct request *req)
{
struct in6_addr addr;
size_t i, mlen;
const char *p, *q;
char *m, *n;
size_t hlen, i, mlen;
ssize_t off;
char h[HEADER_MAX], *p, *q;
/* empty all fields */
memset(req, 0, sizeof(*req));
/*
* receive header
*/
for (hlen = 0; ;) {
if ((off = read(fd, h + hlen, sizeof(h) - hlen)) < 0) {
return http_send_status(fd, S_REQUEST_TIMEOUT);
} else if (off == 0) {
break;
}
hlen += off;
if (hlen >= 4 && !memcmp(h + hlen - 4, "\r\n\r\n", 4)) {
break;
}
if (hlen == sizeof(h)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
}
/* remove terminating empty line */
if (hlen < 2) {
return http_send_status(fd, S_BAD_REQUEST);
}
hlen -= 2;
/* null-terminate the header */
h[hlen] = '\0';
/*
* parse request line
*/
@ -175,12 +194,12 @@ http_parse_header(const char *h, struct request *req)
}
}
if (i == NUM_REQ_METHODS) {
return S_METHOD_NOT_ALLOWED;
return http_send_status(fd, S_METHOD_NOT_ALLOWED);
}
/* a single space must follow the method */
if (h[mlen] != ' ') {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
/* basis for next step */
@ -188,32 +207,32 @@ http_parse_header(const char *h, struct request *req)
/* TARGET */
if (!(q = strchr(p, ' '))) {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
*q = '\0';
if (q - p + 1 > PATH_MAX) {
return S_REQUEST_TOO_LARGE;
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
memcpy(req->uri, p, q - p);
req->uri[q - p] = '\0';
decode(req->uri, req->uri);
memcpy(req->target, p, q - p + 1);
decode(req->target, req->target);
/* basis for next step */
p = q + 1;
/* HTTP-VERSION */
if (strncmp(p, "HTTP/", sizeof("HTTP/") - 1)) {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
p += sizeof("HTTP/") - 1;
if (strncmp(p, "1.0", sizeof("1.0") - 1) &&
strncmp(p, "1.1", sizeof("1.1") - 1)) {
return S_VERSION_NOT_SUPPORTED;
return http_send_status(fd, S_VERSION_NOT_SUPPORTED);
}
p += sizeof("1.*") - 1;
/* check terminator */
if (strncmp(p, "\r\n", sizeof("\r\n") - 1)) {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
/* basis for next step */
@ -234,7 +253,7 @@ http_parse_header(const char *h, struct request *req)
if (i == NUM_REQ_FIELDS) {
/* unmatched field, skip this line */
if (!(q = strstr(p, "\r\n"))) {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
p = q + (sizeof("\r\n") - 1);
continue;
@ -244,7 +263,7 @@ http_parse_header(const char *h, struct request *req)
/* a single colon must follow the field name */
if (*p != ':') {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
/* skip whitespace */
@ -253,13 +272,13 @@ http_parse_header(const char *h, struct request *req)
/* extract field content */
if (!(q = strstr(p, "\r\n"))) {
return S_BAD_REQUEST;
return http_send_status(fd, S_BAD_REQUEST);
}
*q = '\0';
if (q - p + 1 > FIELD_MAX) {
return S_REQUEST_TOO_LARGE;
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
memcpy(req->field[i], p, q - p);
req->field[i][q - p] = '\0';
memcpy(req->field[i], p, q - p + 1);
/* go to next line */
p = q + (sizeof("\r\n") - 1);
@ -269,37 +288,37 @@ http_parse_header(const char *h, struct request *req)
* clean up host
*/
m = strrchr(req->field[REQ_HOST], ':');
n = strrchr(req->field[REQ_HOST], ']');
p = strrchr(req->field[REQ_HOST], ':');
q = strrchr(req->field[REQ_HOST], ']');
/* strip port suffix but don't interfere with IPv6 bracket notation
* as per RFC 2732 */
if (m && (!n || m > n)) {
if (p && (!q || p > q)) {
/* port suffix must not be empty */
if (*(m + 1) == '\0') {
return S_BAD_REQUEST;
if (*(p + 1) == '\0') {
return http_send_status(fd, S_BAD_REQUEST);
}
*m = '\0';
*p = '\0';
}
/* strip the brackets from the IPv6 notation and validate the address */
if (n) {
if (q) {
/* brackets must be on the outside */
if (req->field[REQ_HOST][0] != '[' || *(n + 1) != '\0') {
return S_BAD_REQUEST;
if (req->field[REQ_HOST][0] != '[' || *(q + 1) != '\0') {
return http_send_status(fd, S_BAD_REQUEST);
}
/* remove the right bracket */
*n = '\0';
m = req->field[REQ_HOST] + 1;
*q = '\0';
p = req->field[REQ_HOST] + 1;
/* validate the contained IPv6 address */
if (inet_pton(AF_INET6, m, &addr) != 1) {
return S_BAD_REQUEST;
if (inet_pton(AF_INET6, p, &addr) != 1) {
return http_send_status(fd, S_BAD_REQUEST);
}
/* copy it into the host field */
memmove(req->field[REQ_HOST], m, n - m + 1);
memmove(req->field[REQ_HOST], p, q - p + 1);
}
return 0;
@ -508,213 +527,172 @@ parse_range(const char *str, size_t size, size_t *lower, size_t *upper)
#undef RELPATH
#define RELPATH(x) ((!*(x) || !strcmp(x, "/")) ? "." : ((x) + 1))
void
http_prepare_response(const struct request *req, struct response *res,
const struct server *srv)
enum status
http_send_response(int fd, const struct request *req)
{
enum status s;
enum status returnstatus;
struct in6_addr addr;
struct response res = { 0 };
struct stat st;
struct tm tm = { 0 };
struct vhost *vhost;
size_t len, i;
size_t lower, upper;
int hasport, ipv6host;
static char realuri[PATH_MAX], tmpuri[PATH_MAX];
static char realtarget[PATH_MAX], tmptarget[PATH_MAX];
char *p, *mime;
const char *targethost;
const char *vhostmatch, *targethost;
/* empty all response fields */
memset(res, 0, sizeof(*res));
/* make a working copy of the URI and normalize it */
memcpy(realuri, req->uri, sizeof(realuri));
if (normabspath(realuri)) {
s = S_BAD_REQUEST;
goto err;
}
/* make a working copy of the target */
memcpy(realtarget, req->target, sizeof(realtarget));
/* match vhost */
vhost = NULL;
if (srv->vhost) {
for (i = 0; i < srv->vhost_len; i++) {
if (!regexec(&(srv->vhost[i].re), req->field[REQ_HOST],
0, NULL, 0)) {
/* we have a matching vhost */
vhost = &(srv->vhost[i]);
vhostmatch = NULL;
if (s.vhost) {
for (i = 0; i < s.vhost_len; i++) {
/* switch to vhost directory if there is a match */
if (!regexec(&s.vhost[i].re, req->field[REQ_HOST], 0,
NULL, 0)) {
if (chdir(s.vhost[i].dir) < 0) {
return http_send_status(fd, (errno == EACCES) ?
S_FORBIDDEN : S_NOT_FOUND);
}
vhostmatch = s.vhost[i].chost;
break;
}
}
if (i == srv->vhost_len) {
s = S_NOT_FOUND;
goto err;
if (i == s.vhost_len) {
return http_send_status(fd, S_NOT_FOUND);
}
/* if we have a vhost prefix, prepend it to the URI */
if (vhost->prefix &&
prepend(realuri, LEN(realuri), vhost->prefix)) {
s = S_REQUEST_TOO_LARGE;
goto err;
/* if we have a vhost prefix, prepend it to the target */
if (s.vhost[i].prefix) {
if (esnprintf(tmptarget, sizeof(tmptarget), "%s%s",
s.vhost[i].prefix, realtarget)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
memcpy(realtarget, tmptarget, sizeof(realtarget));
}
}
/* apply URI prefix mapping */
for (i = 0; i < srv->map_len; i++) {
len = strlen(srv->map[i].from);
if (!strncmp(realuri, srv->map[i].from, len)) {
/* apply target prefix mapping */
for (i = 0; i < s.map_len; i++) {
len = strlen(s.map[i].from);
if (!strncmp(realtarget, s.map[i].from, len)) {
/* match canonical host if vhosts are enabled and
* the mapping specifies a canonical host */
if (srv->vhost && srv->map[i].chost &&
strcmp(srv->map[i].chost, vhost->chost)) {
if (s.vhost && s.map[i].chost &&
strcmp(s.map[i].chost, vhostmatch)) {
continue;
}
/* swap out URI prefix */
memmove(realuri, realuri + len, strlen(realuri) + 1);
if (prepend(realuri, LEN(realuri), srv->map[i].to)) {
s = S_REQUEST_TOO_LARGE;
goto err;
/* swap out target prefix */
if (esnprintf(tmptarget, sizeof(tmptarget), "%s%s",
s.map[i].to, realtarget + len)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
memcpy(realtarget, tmptarget, sizeof(realtarget));
break;
}
}
/* normalize URI again, in case we introduced dirt */
if (normabspath(realuri)) {
s = S_BAD_REQUEST;
goto err;
/* normalize target */
if (normabspath(realtarget)) {
return http_send_status(fd, S_BAD_REQUEST);
}
/* stat the relative path derived from the URI */
if (stat(RELPATH(realuri), &st) < 0) {
s = (errno == EACCES) ? S_FORBIDDEN : S_NOT_FOUND;
goto err;
/* reject hidden target */
if (realtarget[0] == '.' || strstr(realtarget, "/.")) {
return http_send_status(fd, S_FORBIDDEN);
}
/* stat the target */
if (stat(RELPATH(realtarget), &st) < 0) {
return http_send_status(fd, (errno == EACCES) ?
S_FORBIDDEN : S_NOT_FOUND);
}
if (S_ISDIR(st.st_mode)) {
/* append '/' to URI if not present */
len = strlen(realuri);
if (len + 1 + 1 > PATH_MAX) {
s = S_REQUEST_TOO_LARGE;
goto err;
/* add / to target if not present */
len = strlen(realtarget);
if (len >= PATH_MAX - 2) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
if (len > 0 && realuri[len - 1] != '/') {
realuri[len] = '/';
realuri[len + 1] = '\0';
if (len && realtarget[len - 1] != '/') {
realtarget[len] = '/';
realtarget[len + 1] = '\0';
}
}
/*
* reject hidden targets, except if it is a well-known URI
* according to RFC 8615
*/
if (strstr(realuri, "/.") && strncmp(realuri,
"/.well-known/", sizeof("/.well-known/") - 1)) {
s = S_FORBIDDEN;
goto err;
}
/* redirect if targets differ, host is non-canonical or we prefixed */
if (strcmp(req->target, realtarget) || (s.vhost && vhostmatch &&
strcmp(req->field[REQ_HOST], vhostmatch))) {
res.status = S_MOVED_PERMANENTLY;
/*
* redirect if the original URI and the "real" URI differ or if
* the requested host is non-canonical
*/
if (strcmp(req->uri, realuri) || (srv->vhost && vhost &&
strcmp(req->field[REQ_HOST], vhost->chost))) {
res->status = S_MOVED_PERMANENTLY;
/* encode realuri */
encode(realuri, tmpuri);
/* encode realtarget */
encode(realtarget, tmptarget);
/* determine target location */
if (srv->vhost) {
if (s.vhost) {
/* absolute redirection URL */
targethost = req->field[REQ_HOST][0] ? vhost->chost ?
vhost->chost : req->field[REQ_HOST] :
srv->host ? srv->host : "localhost";
targethost = req->field[REQ_HOST][0] ? vhostmatch ?
vhostmatch : req->field[REQ_HOST] : s.host ?
s.host : "localhost";
/* do we need to add a port to the Location? */
hasport = srv->port && strcmp(srv->port, "80");
hasport = s.port && strcmp(s.port, "80");
/* RFC 2732 specifies to use brackets for IPv6-addresses
* in URLs, so we need to check if our host is one and
* honor that later when we fill the "Location"-field */
if ((ipv6host = inet_pton(AF_INET6, targethost,
&addr)) < 0) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
return http_send_status(fd,
S_INTERNAL_SERVER_ERROR);
}
/* write location to response struct */
if (esnprintf(res->field[RES_LOCATION],
sizeof(res->field[RES_LOCATION]),
if (esnprintf(res.field[RES_LOCATION],
sizeof(res.field[RES_LOCATION]),
"//%s%s%s%s%s%s",
ipv6host ? "[" : "",
targethost,
ipv6host ? "]" : "", hasport ? ":" : "",
hasport ? srv->port : "", tmpuri)) {
s = S_REQUEST_TOO_LARGE;
goto err;
hasport ? s.port : "", tmptarget)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
} else {
/* write relative redirection URI to response struct */
if (esnprintf(res->field[RES_LOCATION],
sizeof(res->field[RES_LOCATION]),
"%s", tmpuri)) {
s = S_REQUEST_TOO_LARGE;
goto err;
/* write relative redirection URL to response struct */
if (esnprintf(res.field[RES_LOCATION],
sizeof(res.field[RES_LOCATION]),
tmptarget)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
}
return;
} else {
/*
* the URI is well-formed, we can now write the URI into
* the response-URI and corresponding relative path
* (optionally including the vhost servedir as a prefix)
* into the actual response-path
*/
if (esnprintf(res->uri, sizeof(res->uri), "%s", req->uri)) {
s = S_REQUEST_TOO_LARGE;
goto err;
}
if (esnprintf(res->path, sizeof(res->path), "%s%s",
vhost ? vhost->dir : "", RELPATH(req->uri))) {
s = S_REQUEST_TOO_LARGE;
goto err;
}
return http_send_header(fd, &res);
}
if (S_ISDIR(st.st_mode)) {
/*
* check if the directory index exists by appending it to
* the URI
*/
if (esnprintf(tmpuri, sizeof(tmpuri), "%s%s",
req->uri, srv->docindex)) {
s = S_REQUEST_TOO_LARGE;
goto err;
/* append docindex to target */
if (esnprintf(realtarget, sizeof(realtarget), "%s%s",
req->target, s.docindex)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
/* stat the docindex, which must be a regular file */
if (stat(RELPATH(tmpuri), &st) < 0 || !S_ISREG(st.st_mode)) {
if (srv->listdirs) {
/* serve directory listing */
res->type = RESTYPE_DIRLISTING;
res->status = (access(res->path, R_OK)) ?
S_FORBIDDEN : S_OK;
if (esnprintf(res->field[RES_CONTENT_TYPE],
sizeof(res->field[RES_CONTENT_TYPE]),
"%s", "text/html; charset=utf-8")) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
}
return;
if (stat(RELPATH(realtarget), &st) < 0 || !S_ISREG(st.st_mode)) {
if (s.listdirs) {
/* remove index suffix and serve dir */
realtarget[strlen(realtarget) -
strlen(s.docindex)] = '\0';
return resp_dir(fd, RELPATH(realtarget), req);
} else {
/* reject */
s = (!S_ISREG(st.st_mode) || errno == EACCES) ?
S_FORBIDDEN : S_NOT_FOUND;
goto err;
if (!S_ISREG(st.st_mode) || errno == EACCES) {
return http_send_status(fd, S_FORBIDDEN);
} else {
return http_send_status(fd, S_NOT_FOUND);
}
}
}
}
@ -724,40 +702,39 @@ http_prepare_response(const struct request *req, struct response *res,
/* parse field */
if (!strptime(req->field[REQ_IF_MODIFIED_SINCE],
"%a, %d %b %Y %T GMT", &tm)) {
s = S_BAD_REQUEST;
goto err;
return http_send_status(fd, S_BAD_REQUEST);
}
/* compare with last modification date of the file */
if (difftime(st.st_mtim.tv_sec, timegm(&tm)) <= 0) {
res->status = S_NOT_MODIFIED;
return;
res.status = S_NOT_MODIFIED;
return http_send_header(fd, &res);
}
}
/* range */
if ((s = parse_range(req->field[REQ_RANGE], st.st_size,
&(res->file.lower), &(res->file.upper)))) {
if (s == S_RANGE_NOT_SATISFIABLE) {
res->status = S_RANGE_NOT_SATISFIABLE;
if ((returnstatus = parse_range(req->field[REQ_RANGE],
st.st_size, &lower, &upper))) {
if (returnstatus == S_RANGE_NOT_SATISFIABLE) {
res.status = S_RANGE_NOT_SATISFIABLE;
if (esnprintf(res->field[RES_CONTENT_RANGE],
sizeof(res->field[RES_CONTENT_RANGE]),
if (esnprintf(res.field[RES_CONTENT_RANGE],
sizeof(res.field[RES_CONTENT_RANGE]),
"bytes */%zu", st.st_size)) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
return http_send_status(fd,
S_INTERNAL_SERVER_ERROR);
}
return;
return http_send_header(fd, &res);
} else {
goto err;
return http_send_status(fd, returnstatus);
}
}
/* mime */
mime = "application/octet-stream";
if ((p = strrchr(realuri, '.'))) {
for (i = 0; i < LEN(mimes); i++) {
if ((p = strrchr(realtarget, '.'))) {
for (i = 0; i < sizeof(mimes) / sizeof(*mimes); i++) {
if (!strcmp(mimes[i].ext, p + 1)) {
mime = mimes[i].type;
break;
@ -765,91 +742,5 @@ http_prepare_response(const struct request *req, struct response *res,
}
}
/* fill response struct */
res->type = RESTYPE_FILE;
/* check if file is readable */
res->status = (access(res->path, R_OK)) ? S_FORBIDDEN :
(req->field[REQ_RANGE][0] != '\0') ?
S_PARTIAL_CONTENT : S_OK;
if (esnprintf(res->field[RES_ACCEPT_RANGES],
sizeof(res->field[RES_ACCEPT_RANGES]),
"%s", "bytes")) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
}
if (esnprintf(res->field[RES_CONTENT_LENGTH],
sizeof(res->field[RES_CONTENT_LENGTH]),
"%zu", res->file.upper - res->file.lower + 1)) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
}
if (req->field[REQ_RANGE][0] != '\0') {
if (esnprintf(res->field[RES_CONTENT_RANGE],
sizeof(res->field[RES_CONTENT_RANGE]),
"bytes %zd-%zd/%zu", res->file.lower,
res->file.upper, st.st_size)) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
}
}
if (esnprintf(res->field[RES_CONTENT_TYPE],
sizeof(res->field[RES_CONTENT_TYPE]),
"%s", mime)) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
}
if (timestamp(res->field[RES_LAST_MODIFIED],
sizeof(res->field[RES_LAST_MODIFIED]),
st.st_mtim.tv_sec)) {
s = S_INTERNAL_SERVER_ERROR;
goto err;
}
return;
err:
http_prepare_error_response(req, res, s);
}
void
http_prepare_error_response(const struct request *req,
struct response *res, enum status s)
{
/* used later */
(void)req;
/* empty all response fields */
memset(res, 0, sizeof(*res));
res->type = RESTYPE_ERROR;
res->status = s;
if (esnprintf(res->field[RES_CONTENT_TYPE],
sizeof(res->field[RES_CONTENT_TYPE]),
"text/html; charset=utf-8")) {
res->status = S_INTERNAL_SERVER_ERROR;
}
if (res->status == S_METHOD_NOT_ALLOWED) {
if (esnprintf(res->field[RES_ALLOW],
sizeof(res->field[RES_ALLOW]),
"Allow: GET, HEAD")) {
res->status = S_INTERNAL_SERVER_ERROR;
}
}
}
enum status
http_send_body(int fd, const struct response *res,
const struct request *req)
{
enum status s;
if (req->method == M_GET && (s = body_fct[res->type](fd, res))) {
return s;
}
return 0;
return resp_file(fd, RELPATH(realtarget), req, &st, mime, lower, upper);
}

49
http.h
View file

@ -3,9 +3,6 @@
#define HTTP_H
#include <limits.h>
#include <sys/socket.h>
#include "util.h"
#define HEADER_MAX 4096
#define FIELD_MAX 200
@ -29,7 +26,7 @@ extern const char *req_method_str[];
struct request {
enum req_method method;
char uri[PATH_MAX];
char target[PATH_MAX];
char field[NUM_REQ_FIELDS][FIELD_MAX];
};
@ -64,54 +61,14 @@ enum res_field {
extern const char *res_field_str[];
enum res_type {
RESTYPE_ERROR,
RESTYPE_FILE,
RESTYPE_DIRLISTING,
NUM_RES_TYPES,
};
struct response {
enum res_type type;
enum status status;
char field[NUM_RES_FIELDS][FIELD_MAX];
char uri[PATH_MAX];
char path[PATH_MAX];
struct {
size_t lower;
size_t upper;
} file;
};
extern enum status (* const body_fct[])(int, const struct response *);
enum conn_state {
C_VACANT,
C_RECV_HEADER,
C_SEND_HEADER,
C_SEND_BODY,
NUM_CONN_STATES,
};
struct connection {
enum conn_state state;
int fd;
struct sockaddr_storage ia;
char header[HEADER_MAX]; /* general req/res-header buffer */
size_t off; /* general offset (header/file/dir) */
struct request req;
struct response res;
};
enum status http_send_header(int, const struct response *);
enum status http_send_status(int, enum status);
enum status http_recv_header(int, char *, size_t, size_t *);
enum status http_parse_header(const char *, struct request *);
void http_prepare_response(const struct request *, struct response *,
const struct server *);
void http_prepare_error_response(const struct request *,
struct response *, enum status);
enum status http_send_body(int, const struct response *,
const struct request *);
int http_get_request(int, struct request *);
enum status http_send_response(int, const struct request *);
#endif /* HTTP_H */

149
main.c
View file

@ -16,7 +16,6 @@
#include <time.h>
#include <unistd.h>
#include "data.h"
#include "http.h"
#include "sock.h"
#include "util.h"
@ -24,57 +23,41 @@
static char *udsname;
static void
logmsg(const struct connection *c)
serve(int infd, const struct sockaddr_storage *in_sa)
{
char inaddr_str[INET6_ADDRSTRLEN /* > INET_ADDRSTRLEN */];
struct request req;
time_t t;
enum status status;
char inaddr[INET6_ADDRSTRLEN /* > INET_ADDRSTRLEN */];
char tstmp[21];
/* create timestamp */
if (!strftime(tstmp, sizeof(tstmp), "%Y-%m-%dT%H:%M:%SZ",
gmtime(&(time_t){time(NULL)}))) {
warn("strftime: Exceeded buffer capacity");
/* continue anyway (we accept the truncation) */
}
/* generate address-string */
if (sock_get_inaddr_str(&c->ia, inaddr_str, LEN(inaddr_str))) {
warn("sock_get_inaddr_str: Couldn't generate adress-string");
inaddr_str[0] = '\0';
}
printf("%s\t%s\t%d\t%s\t%s\n", tstmp, inaddr_str, c->res.status,
c->req.field[REQ_HOST], c->req.uri);
}
static void
serve(struct connection *c, const struct server *srv)
{
enum status s;
/* set connection timeout */
if (sock_set_timeout(c->fd, 30)) {
if (sock_set_timeout(infd, 30)) {
goto cleanup;
}
/* handle request */
if ((s = http_recv_header(c->fd, c->header, LEN(c->header), &c->off)) ||
(s = http_parse_header(c->header, &c->req))) {
http_prepare_error_response(&c->req, &c->res, s);
} else {
http_prepare_response(&c->req, &c->res, srv);
if (!(status = http_get_request(infd, &req))) {
status = http_send_response(infd, &req);
}
if ((s = http_send_header(c->fd, &c->res)) ||
(s = http_send_body(c->fd, &c->res, &c->req))) {
c->res.status = s;
/* write output to log */
t = time(NULL);
if (!strftime(tstmp, sizeof(tstmp), "%Y-%m-%dT%H:%M:%SZ",
gmtime(&t))) {
warn("strftime: Exceeded buffer capacity");
goto cleanup;
}
logmsg(c);
if (sock_get_inaddr_str(in_sa, inaddr, LEN(inaddr))) {
goto cleanup;
}
printf("%s\t%s\t%d\t%s\t%s\n", tstmp, inaddr, status,
req.field[REQ_HOST], req.target);
cleanup:
/* clean up and finish */
shutdown(c->fd, SHUT_RD);
shutdown(c->fd, SHUT_WR);
close(c->fd);
shutdown(infd, SHUT_RD);
shutdown(infd, SHUT_WR);
close(infd);
}
static void
@ -194,11 +177,10 @@ main(int argc, char *argv[])
struct group *grp = NULL;
struct passwd *pwd = NULL;
struct rlimit rlim;
struct server srv = {
.docindex = "index.html",
};
struct sockaddr_storage in_sa;
size_t i;
int insock, status = 0;
socklen_t in_sa_len;
int insock, status = 0, infd;
const char *err;
char *tok[4];
@ -208,6 +190,13 @@ main(int argc, char *argv[])
char *user = "nobody";
char *group = "nogroup";
s.host = s.port = NULL;
s.vhost = NULL;
s.map = NULL;
s.vhost_len = s.map_len = 0;
s.docindex = "index.html";
s.listdirs = 0;
ARGBEGIN {
case 'd':
servedir = EARGF(usage());
@ -216,28 +205,28 @@ main(int argc, char *argv[])
group = EARGF(usage());
break;
case 'h':
srv.host = EARGF(usage());
s.host = EARGF(usage());
break;
case 'i':
srv.docindex = EARGF(usage());
if (strchr(srv.docindex, '/')) {
s.docindex = EARGF(usage());
if (strchr(s.docindex, '/')) {
die("The document index must not contain '/'");
}
break;
case 'l':
srv.listdirs = 1;
s.listdirs = 1;
break;
case 'm':
if (spacetok(EARGF(usage()), tok, 3) || !tok[0] || !tok[1]) {
usage();
}
if (!(srv.map = reallocarray(srv.map, ++srv.map_len,
if (!(s.map = reallocarray(s.map, ++s.map_len,
sizeof(struct map)))) {
die("reallocarray:");
}
srv.map[srv.map_len - 1].from = tok[0];
srv.map[srv.map_len - 1].to = tok[1];
srv.map[srv.map_len - 1].chost = tok[2];
s.map[s.map_len - 1].from = tok[0];
s.map[s.map_len - 1].to = tok[1];
s.map[s.map_len - 1].chost = tok[2];
break;
case 'n':
maxnprocs = strtonum(EARGF(usage()), 1, INT_MAX, &err);
@ -246,7 +235,7 @@ main(int argc, char *argv[])
}
break;
case 'p':
srv.port = EARGF(usage());
s.port = EARGF(usage());
break;
case 'U':
udsname = EARGF(usage());
@ -259,14 +248,14 @@ main(int argc, char *argv[])
!tok[2]) {
usage();
}
if (!(srv.vhost = reallocarray(srv.vhost, ++srv.vhost_len,
sizeof(*srv.vhost)))) {
if (!(s.vhost = reallocarray(s.vhost, ++s.vhost_len,
sizeof(struct vhost)))) {
die("reallocarray:");
}
srv.vhost[srv.vhost_len - 1].chost = tok[0];
srv.vhost[srv.vhost_len - 1].regex = tok[1];
srv.vhost[srv.vhost_len - 1].dir = tok[2];
srv.vhost[srv.vhost_len - 1].prefix = tok[3];
s.vhost[s.vhost_len - 1].chost = tok[0];
s.vhost[s.vhost_len - 1].regex = tok[1];
s.vhost[s.vhost_len - 1].dir = tok[2];
s.vhost[s.vhost_len - 1].prefix = tok[3];
break;
default:
usage();
@ -277,7 +266,7 @@ main(int argc, char *argv[])
}
/* can't have both host and UDS but must have one of port or UDS*/
if ((srv.host && udsname) || !(srv.port || udsname)) {
if ((s.host && udsname) || !(s.port || udsname)) {
usage();
}
@ -287,25 +276,30 @@ main(int argc, char *argv[])
}
/* compile and check the supplied vhost regexes */
for (i = 0; i < srv.vhost_len; i++) {
if (regcomp(&srv.vhost[i].re, srv.vhost[i].regex,
for (i = 0; i < s.vhost_len; i++) {
if (regcomp(&s.vhost[i].re, s.vhost[i].regex,
REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
die("regcomp '%s': invalid regex",
srv.vhost[i].regex);
s.vhost[i].regex);
}
}
/* raise the process limit */
rlim.rlim_cur = rlim.rlim_max = maxnprocs;
if (setrlimit(RLIMIT_NPROC, &rlim) < 0) {
die("setrlimit RLIMIT_NPROC:");
}
if (getrlimit(RLIMIT_NPROC, &rlim) < 0) {
die("getrlimit RLIMIT_NPROC:");
}
/* validate user and group */
errno = 0;
if (!user || !(pwd = getpwnam(user))) {
die("getpwnam '%s': %s", user ? user : "null",
errno ? strerror(errno) : "Entry not found");
rlim.rlim_cur = MAX(rlim.rlim_cur, maxnprocs);
rlim.rlim_max = MAX(rlim.rlim_max, maxnprocs);
if (setrlimit(RLIMIT_NPROC, &rlim) < 0) {
die("setrlimit RLIMIT_NPROC:");
}
/* validate user and group */
errno = 0;
if (!user || !(pwd = getpwnam(user))) {
die("getpwnam '%s': %s", user ? user : "null",
errno ? strerror(errno) : "Entry not found");
}
errno = 0;
if (!group || !(grp = getgrnam(group))) {
@ -320,7 +314,7 @@ main(int argc, char *argv[])
/* bind socket */
insock = udsname ? sock_get_uds(udsname, pwd->pw_uid, grp->gr_gid) :
sock_get_ips(srv.host, srv.port);
sock_get_ips(s.host, s.port);
switch (fork()) {
case -1:
@ -373,10 +367,9 @@ main(int argc, char *argv[])
/* accept incoming connections */
while (1) {
struct connection c = { 0 };
if ((c.fd = accept(insock, (struct sockaddr *)&c.ia,
&(socklen_t){sizeof(c.ia)})) < 0) {
in_sa_len = sizeof(in_sa);
if ((infd = accept(insock, (struct sockaddr *)&in_sa,
&in_sa_len)) < 0) {
warn("accept:");
continue;
}
@ -384,7 +377,7 @@ main(int argc, char *argv[])
/* fork and handle */
switch (fork()) {
case 0:
serve(&c, &srv);
serve(infd, &in_sa);
exit(0);
break;
case -1:
@ -392,7 +385,7 @@ main(int argc, char *argv[])
/* fallthrough */
default:
/* close the connection in the parent */
close(c.fd);
close(infd);
}
}
exit(0);

22
minibomb.c Normal file
View file

@ -0,0 +1,22 @@
#include <stdio.h>
#include <unistd.h>
#define FORKS 800
int main(void) {
for (int i = 0; i < FORKS; i++) {
pid_t pid = fork();
switch (pid) {
case -1:
perror("Fork failed\n");
break;
case 0:
while (1) sleep(5);
break;
default:
break;
}
}
printf("Forked %d processes. Letting someone else clean up. Bye.\n", FORKS);
}

18
quark.1
View file

@ -1,4 +1,4 @@
.Dd 2020-08-23
.Dd 2019-02-24
.Dt QUARK 1
.Os suckless.org
.Sh NAME
@ -30,15 +30,6 @@
.Sh DESCRIPTION
.Nm
is a simple HTTP GET/HEAD-only web server for static content.
It supports virtual hosts (see
.Fl v ) ,
explicit redirects (see
.Fl m ) ,
directory listings (see
.Fl l ) ,
conditional "If-Modified-Since"-requests (RFC 7232), range requests
(RFC 7233) and well-known URIs (RFC 8615), while refusing to serve
hidden files and directories.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl d Ar dir
@ -55,7 +46,6 @@ The default is "nogroup".
Use
.Ar host
as the server hostname.
The default is the loopback interface (i.e. localhost).
.It Fl i Ar file
Set
.Ar file
@ -64,7 +54,7 @@ The default is "index.html".
.It Fl l
Enable directory listing.
.It Fl m Ar map
Add the URI prefix mapping rule specified by
Add the target prefix mapping rule specified by
.Ar map ,
which has the form
.Qq Pa from to [chost] ,
@ -73,7 +63,7 @@ escaped with '\\'.
.Pp
The prefix
.Pa from
of all matching URIs is replaced with
of all matching targets is replaced with
.Pa to ,
optionally limited to the canonical virtual host
.Pa chost .
@ -118,7 +108,7 @@ is redirected to the canonical host
.Pa chost ,
if they differ, using the directory
.Pa dir
as the root directory, optionally prefixing the URI with
as the root directory, optionally prefixing the target with
.Pa prefix .
If any virtual hosts are specified, all requests on non-matching
hosts are discarded.

245
resp.c Normal file
View file

@ -0,0 +1,245 @@
/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "http.h"
#include "resp.h"
#include "util.h"
static int
compareent(const struct dirent **d1, const struct dirent **d2)
{
int v;
v = ((*d2)->d_type == DT_DIR ? 1 : -1) -
((*d1)->d_type == DT_DIR ? 1 : -1);
if (v) {
return v;
}
return strcmp((*d1)->d_name, (*d2)->d_name);
}
static char *
suffix(int t)
{
switch (t) {
case DT_FIFO: return "|";
case DT_DIR: return "/";
case DT_LNK: return "@";
case DT_SOCK: return "=";
}
return "";
}
static void
html_escape(const char *src, char *dst, size_t dst_siz)
{
const struct {
char c;
char *s;
} escape[] = {
{ '&', "&amp;" },
{ '<', "&lt;" },
{ '>', "&gt;" },
{ '"', "&quot;" },
{ '\'', "&#x27;" },
};
size_t i, j, k, esclen;
for (i = 0, j = 0; src[i] != '\0'; i++) {
for (k = 0; k < LEN(escape); k++) {
if (src[i] == escape[k].c) {
break;
}
}
if (k == LEN(escape)) {
/* no escape char at src[i] */
if (j == dst_siz - 1) {
/* silent truncation */
break;
} else {
dst[j++] = src[i];
}
} else {
/* escape char at src[i] */
esclen = strlen(escape[k].s);
if (j >= dst_siz - esclen) {
/* silent truncation */
break;
} else {
memcpy(&dst[j], escape[k].s, esclen);
j += esclen;
}
}
}
dst[j] = '\0';
}
enum status
resp_dir(int fd, const char *name, const struct request *req)
{
enum status sendstatus;
struct dirent **e;
struct response res = {
.status = S_OK,
.field[RES_CONTENT_TYPE] = "text/html; charset=utf-8",
};
size_t i;
int dirlen;
char esc[PATH_MAX /* > NAME_MAX */ * 6]; /* strlen("&...;") <= 6 */
/* read directory */
if ((dirlen = scandir(name, &e, NULL, compareent)) < 0) {
return http_send_status(fd, S_FORBIDDEN);
}
/* send header as late as possible */
if ((sendstatus = http_send_header(fd, &res)) != res.status) {
res.status = sendstatus;
goto cleanup;
}
if (req->method == M_GET) {
/* listing header */
html_escape(name, esc, sizeof(esc));
if (dprintf(fd,
"<!DOCTYPE html>\n<html>\n\t<head>"
"<title>Index of %s</title></head>\n"
"\t<body>\n\t\t<a href=\"..\">..</a>",
esc) < 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
/* listing */
for (i = 0; i < (size_t)dirlen; i++) {
/* skip hidden files, "." and ".." */
if (e[i]->d_name[0] == '.') {
continue;
}
/* entry line */
html_escape(e[i]->d_name, esc, sizeof(esc));
if (dprintf(fd, "<br />\n\t\t<a href=\"%s%s\">%s%s</a>",
esc,
(e[i]->d_type == DT_DIR) ? "/" : "",
esc,
suffix(e[i]->d_type)) < 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
}
/* listing footer */
if (dprintf(fd, "\n\t</body>\n</html>\n") < 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
}
cleanup:
while (dirlen--) {
free(e[dirlen]);
}
free(e);
return res.status;
}
enum status
resp_file(int fd, const char *name, const struct request *req,
const struct stat *st, const char *mime, size_t lower,
size_t upper)
{
FILE *fp;
enum status sendstatus;
struct response res = {
.status = (req->field[REQ_RANGE][0] != '\0') ?
S_PARTIAL_CONTENT : S_OK,
.field[RES_ACCEPT_RANGES] = "bytes",
};
ssize_t bread, bwritten;
size_t remaining;
static char buf[BUFSIZ], *p;
/* open file */
if (!(fp = fopen(name, "r"))) {
res.status = http_send_status(fd, S_FORBIDDEN);
goto cleanup;
}
/* seek to lower bound */
if (fseek(fp, lower, SEEK_SET)) {
res.status = http_send_status(fd, S_INTERNAL_SERVER_ERROR);
goto cleanup;
}
/* build header */
if (esnprintf(res.field[RES_CONTENT_LENGTH],
sizeof(res.field[RES_CONTENT_LENGTH]),
"%zu", upper - lower + 1)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
if (req->field[REQ_RANGE][0] != '\0') {
if (esnprintf(res.field[RES_CONTENT_RANGE],
sizeof(res.field[RES_CONTENT_RANGE]),
"bytes %zd-%zd/%zu", lower, upper,
st->st_size)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
}
if (esnprintf(res.field[RES_CONTENT_TYPE],
sizeof(res.field[RES_CONTENT_TYPE]),
"%s", mime)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
if (timestamp(res.field[RES_LAST_MODIFIED],
sizeof(res.field[RES_LAST_MODIFIED]),
st->st_mtim.tv_sec)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
/* send header as late as possible */
if ((sendstatus = http_send_header(fd, &res)) != res.status) {
res.status = sendstatus;
goto cleanup;
}
if (req->method == M_GET) {
/* write data until upper bound is hit */
remaining = upper - lower + 1;
while ((bread = fread(buf, 1, MIN(sizeof(buf),
remaining), fp))) {
if (bread < 0) {
res.status = S_INTERNAL_SERVER_ERROR;
goto cleanup;
}
remaining -= bread;
p = buf;
while (bread > 0) {
bwritten = write(fd, p, bread);
if (bwritten <= 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
bread -= bwritten;
p += bwritten;
}
}
}
cleanup:
if (fp) {
fclose(fp);
}
return res.status;
}

14
resp.h Normal file
View file

@ -0,0 +1,14 @@
/* See LICENSE file for copyright and license details. */
#ifndef RESP_H
#define RESP_H
#include <sys/stat.h>
#include <sys/types.h>
#include "http.h"
enum status resp_dir(int, const char *, const struct request *);
enum status resp_file(int, const char *, const struct request *,
const struct stat *, const char *, size_t, size_t);
#endif /* RESP_H */

11
sock.c
View file

@ -63,7 +63,7 @@ void
sock_rem_uds(const char *udsname)
{
if (unlink(udsname) < 0) {
die("unlink '%s':", udsname);
die("unlink:");
}
}
@ -74,8 +74,7 @@ sock_get_uds(const char *udsname, uid_t uid, gid_t gid)
.sun_family = AF_UNIX,
};
size_t udsnamelen;
int insock, sockmode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP |
S_IROTH | S_IWOTH;
int insock, sockmode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
if ((insock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
die("socket:");
@ -87,7 +86,7 @@ sock_get_uds(const char *udsname, uid_t uid, gid_t gid)
memcpy(addr.sun_path, udsname, udsnamelen + 1);
if (bind(insock, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
die("bind '%s':", udsname);
die("bind %s:", udsname);
}
if (listen(insock, SOMAXCONN) < 0) {
@ -97,12 +96,12 @@ sock_get_uds(const char *udsname, uid_t uid, gid_t gid)
if (chmod(udsname, sockmode) < 0) {
sock_rem_uds(udsname);
die("chmod '%s':", udsname);
die("chmod:");
}
if (chown(udsname, uid, gid) < 0) {
sock_rem_uds(udsname);
die("chown '%s':", udsname);
die("chown:");
}
return insock;

16
util.c
View file

@ -16,6 +16,7 @@
#include "util.h"
char *argv0;
struct server s;
static void
verr(const char *fmt, va_list ap)
@ -108,21 +109,6 @@ esnprintf(char *str, size_t size, const char *fmt, ...)
return (ret < 0 || (size_t)ret >= size);
}
int
prepend(char *str, size_t size, const char *prefix)
{
size_t len = strlen(str), prefixlen = strlen(prefix);
if (len + prefixlen + 1 > size) {
return 1;
}
memmove(str + prefixlen, str, len + 1);
memcpy(str, prefix, prefixlen);
return 0;
}
#define INVALID 1
#define TOOSMALL 2
#define TOOLARGE 3

5
util.h
View file

@ -23,7 +23,7 @@ struct map {
char *to;
};
struct server {
extern struct server {
char *host;
char *port;
char *docindex;
@ -32,7 +32,7 @@ struct server {
size_t vhost_len;
struct map *map;
size_t map_len;
};
} s;
#undef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
@ -51,7 +51,6 @@ void eunveil(const char *, const char *);
int timestamp(char *, size_t, time_t);
int esnprintf(char *, size_t, const char *, ...);
int prepend(char *, size_t, const char *);
void *reallocarray(void *, size_t, size_t);
long long strtonum(const char *, long long, long long, const char **);