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darkhttpd.c
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darkhttpd.c
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/* darkhttpd - a simple, single-threaded, static content webserver.
* https://unix4lyfe.org/darkhttpd/
* Copyright (c) 2003-2024 Emil Mikulic <emikulic@gmail.com>
*
* 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.
*/
static const char
pkgname[] = "darkhttpd/1.16.from.git",
copyright[] = "copyright (c) 2003-2024 Emil Mikulic";
/* Possible build options: -DDEBUG -DNO_IPV6 */
#ifndef NO_IPV6
# define HAVE_INET6
#endif
#ifndef DEBUG
# define NDEBUG
static const int debug = 0;
#else
static const int debug = 1;
#endif
#ifdef __linux
# define _GNU_SOURCE /* for strsignal() and vasprintf() */
# define _FILE_OFFSET_BITS 64 /* stat() files bigger than 2GB */
# include <sys/sendfile.h>
#endif
#ifdef __sun__
# include <sys/sendfile.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
/* The time formatting that we use in directory listings. */
/* An example of the default is 2013-09-09 13:01, which should be compatible */
/* with xbmc/kodi. */
#define DIR_LIST_MTIME_FORMAT "%Y-%m-%d %R"
#define DIR_LIST_MTIME_SIZE 16 + 1 /* How large the buffer will need to be. */
/* This is for non-root chroot support on FreeBSD 14.0+ */
/* Must set sysctl security.bsd.unprivileged_chroot=1 to allow this. */
#ifdef __FreeBSD__
# if __FreeBSD_version >= 1400000
# define HAVE_NON_ROOT_CHROOT
# endif
#endif
#ifdef HAVE_NON_ROOT_CHROOT
#include <sys/procctl.h>
#endif
#if defined(__has_feature)
# if __has_feature(memory_sanitizer)
# include <sanitizer/msan_interface.h>
# endif
#endif
#ifdef __sun__
# ifndef INADDR_NONE
# define INADDR_NONE -1
# endif
#endif
#ifndef MAXNAMLEN
# ifdef NAME_MAX
# define MAXNAMLEN NAME_MAX
# else
# define MAXNAMLEN 255
# endif
#endif
#if defined(O_EXCL) && !defined(O_EXLOCK)
# define O_EXLOCK O_EXCL
#endif
#ifndef __printflike
# ifdef __GNUC__
/* [->] borrowed from FreeBSD's src/sys/sys/cdefs.h,v 1.102.2.2.2.1 */
# define __printflike(fmtarg, firstvararg) \
__attribute__((__format__(__printf__, fmtarg, firstvararg)))
/* [<-] */
# else
# define __printflike(fmtarg, firstvararg)
# endif
#endif
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
# define unused __attribute__((__unused__))
#else
# define unused
#endif
/* [->] borrowed from FreeBSD's src/sys/sys/systm.h,v 1.276.2.7.4.1 */
#ifndef CTASSERT /* Allow lint to override */
# define CTASSERT(x) _CTASSERT(x, __LINE__)
# define _CTASSERT(x, y) __CTASSERT(x, y)
# define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
#endif
/* [<-] */
CTASSERT(sizeof(unsigned long long) >= sizeof(off_t));
#define llu(x) ((unsigned long long)(x))
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__linux)
# include <err.h>
#else
/* err - prints "error: format: strerror(errno)" to stderr and exit()s with
* the given code.
*/
static void err(const int code, const char *format, ...) __printflike(2, 3);
static void err(const int code, const char *format, ...) {
va_list va;
va_start(va, format);
fprintf(stderr, "error: ");
vfprintf(stderr, format, va);
fprintf(stderr, ": %s\n", strerror(errno));
va_end(va);
exit(code);
}
/* errx - err() without the strerror */
static void errx(const int code, const char *format, ...) __printflike(2, 3);
static void errx(const int code, const char *format, ...) {
va_list va;
va_start(va, format);
fprintf(stderr, "error: ");
vfprintf(stderr, format, va);
fprintf(stderr, "\n");
va_end(va);
exit(code);
}
/* warn - err() without the exit */
static void warn(const char *format, ...) __printflike(1, 2);
static void warn(const char *format, ...) {
va_list va;
va_start(va, format);
fprintf(stderr, "warning: ");
vfprintf(stderr, format, va);
fprintf(stderr, ": %s\n", strerror(errno));
va_end(va);
}
#endif
/* [->] LIST_* macros taken from FreeBSD's src/sys/sys/queue.h,v 1.56
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Under a BSD license.
*/
#define LIST_HEAD(name, type) \
struct name { \
struct type *lh_first; /* first element */ \
}
#define LIST_HEAD_INITIALIZER(head) \
{ NULL }
#define LIST_ENTRY(type) \
struct { \
struct type *le_next; /* next element */ \
struct type **le_prev; /* address of previous next element */ \
}
#define LIST_FIRST(head) ((head)->lh_first)
#define LIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = LIST_FIRST((head)); \
(var) && ((tvar) = LIST_NEXT((var), field), 1); \
(var) = (tvar))
#define LIST_INSERT_HEAD(head, elm, field) do { \
if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \
LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
LIST_FIRST((head)) = (elm); \
(elm)->field.le_prev = &LIST_FIRST((head)); \
} while (0)
#define LIST_NEXT(elm, field) ((elm)->field.le_next)
#define LIST_REMOVE(elm, field) do { \
if (LIST_NEXT((elm), field) != NULL) \
LIST_NEXT((elm), field)->field.le_prev = \
(elm)->field.le_prev; \
*(elm)->field.le_prev = LIST_NEXT((elm), field); \
} while (0)
/* [<-] */
static LIST_HEAD(conn_list_head, connection) connlist =
LIST_HEAD_INITIALIZER(conn_list_head);
struct connection {
LIST_ENTRY(connection) entries;
int socket;
#ifdef HAVE_INET6
struct in6_addr client;
#else
in_addr_t client;
#endif
time_t last_active;
enum {
RECV_REQUEST, /* receiving request */
SEND_HEADER, /* sending generated header */
SEND_REPLY, /* sending reply */
DONE /* connection closed, need to remove from queue */
} state;
/* char request[request_length+1] is null-terminated */
char *request;
size_t request_length;
/* request fields */
char *method, *url, *referer, *user_agent, *authorization;
off_t range_begin, range_end;
off_t range_begin_given, range_end_given;
char *header;
size_t header_length, header_sent;
int header_dont_free, header_only, http_code, conn_close;
enum { REPLY_GENERATED, REPLY_FROMFILE } reply_type;
char *reply;
int reply_dont_free;
int reply_fd;
off_t reply_start, reply_length, reply_sent,
total_sent; /* header + body = total, for logging */
};
struct forward_mapping {
const char *host, *target_url; /* These point at argv. */
};
static struct forward_mapping *forward_map = NULL;
static size_t forward_map_size = 0;
static const char *forward_all_url = NULL;
static int forward_to_https = 0;
struct mime_mapping {
char *extension, *mimetype;
};
static struct mime_mapping *mime_map = NULL;
static size_t mime_map_size = 0;
static size_t longest_ext = 0;
/* If a connection is idle for timeout_secs or more, it gets closed and
* removed from the connlist.
*/
static int timeout_secs = 30;
static char *keep_alive_field = NULL;
/* Time is cached in the event loop to avoid making an excessive number of
* gettimeofday() calls.
*/
static time_t now;
/* To prevent a malformed request from eating up too much memory, die once the
* request exceeds this many bytes:
*/
#define MAX_REQUEST_LENGTH 4000
/* Defaults can be overridden on the command-line */
static const char *bindaddr;
static uint16_t bindport = 8080; /* or 80 if running as root */
static int max_connections = -1; /* kern.ipc.somaxconn */
static const char *index_name = "index.html";
static int no_listing = 0;
static int sockin = -1; /* socket to accept connections from */
#ifdef HAVE_INET6
static int inet6 = 0; /* whether the socket uses inet6 */
#endif
static char *wwwroot = NULL; /* a path name */
static char *logfile_name = NULL; /* NULL = no logging */
static FILE *logfile = NULL;
static char *pidfile_name = NULL; /* NULL = no pidfile */
static int want_chroot = 0, want_daemon = 0, want_accf = 0,
want_keepalive = 1, want_server_id = 1;
static char *server_hdr = NULL;
static char *auth_key = NULL; /* NULL or "Basic base64_of_password" */
static char *custom_hdrs = NULL;
static uint64_t num_requests = 0, total_in = 0, total_out = 0;
static int accepting = 1; /* set to 0 to stop accept()ing */
static int syslog_enabled = 0;
volatile int running = 0; /* signal handler sets this to false */
#define INVALID_UID ((uid_t) -1)
#define INVALID_GID ((gid_t) -1)
static uid_t drop_uid = INVALID_UID;
static gid_t drop_gid = INVALID_GID;
/* Default mimetype mappings - make sure this array is NULL terminated. */
static const char *default_extension_map[] = {
"application/json" " json",
"application/pdf" " pdf",
"application/wasm" " wasm",
"application/xml" " xsl xml",
"application/xml-dtd" " dtd",
"application/xslt+xml" " xslt",
"application/zip" " zip",
"audio/flac" " flac",
"audio/mpeg" " mp2 mp3 mpga",
"audio/ogg" " ogg opus oga spx",
"audio/wav" " wav",
"audio/x-m4a" " m4a",
"font/woff" " woff",
"font/woff2" " woff2",
"image/apng" " apng",
"image/avif" " avif",
"image/gif" " gif",
"image/jpeg" " jpeg jpe jpg",
"image/png" " png",
"image/svg+xml" " svg",
"image/webp" " webp",
"text/css" " css",
"text/html" " html htm",
"text/javascript" " js",
"text/plain" " txt asc",
"video/mpeg" " mpeg mpe mpg",
"video/quicktime" " qt mov",
"video/webm" " webm",
"video/x-msvideo" " avi",
"video/mp4" " mp4 m4v",
NULL
};
static const char octet_stream[] = "application/octet-stream";
static const char *default_mimetype = octet_stream;
/* Prototypes. */
static void poll_recv_request(struct connection *conn);
static void poll_send_header(struct connection *conn);
static void poll_send_reply(struct connection *conn);
/* close() that dies on error. */
static void xclose(const int fd) {
if (close(fd) == -1)
err(1, "close()");
}
/* malloc that dies if it can't allocate. */
static void *xmalloc(const size_t size) {
void *ptr = malloc(size);
if (ptr == NULL)
errx(1, "can't allocate %zu bytes", size);
return ptr;
}
/* realloc() that dies if it can't reallocate. */
static void *xrealloc(void *original, const size_t size) {
void *ptr = realloc(original, size);
if (ptr == NULL)
errx(1, "can't reallocate %zu bytes", size);
return ptr;
}
/* strdup() that dies if it can't allocate.
* Implement this ourselves since regular strdup() isn't C89.
*/
static char *xstrdup(const char *src) {
size_t len = strlen(src) + 1;
char *dest = xmalloc(len);
memcpy(dest, src, len);
return dest;
}
/* vasprintf() that dies if it fails. */
static unsigned int xvasprintf(char **ret, const char *format, va_list ap)
__printflike(2,0);
static unsigned int xvasprintf(char **ret, const char *format, va_list ap) {
int len = vasprintf(ret, format, ap);
if (ret == NULL || len == -1)
errx(1, "out of memory in vasprintf()");
return (unsigned int)len;
}
/* asprintf() that dies if it fails. */
static unsigned int xasprintf(char **ret, const char *format, ...)
__printflike(2,3);
static unsigned int xasprintf(char **ret, const char *format, ...) {
va_list va;
unsigned int len;
va_start(va, format);
len = xvasprintf(ret, format, va);
va_end(va);
return len;
}
/* Append buffer code. A somewhat efficient string buffer with pool-based
* reallocation.
*/
#ifndef APBUF_INIT
# define APBUF_INIT 4096
#endif
#define APBUF_GROW APBUF_INIT
struct apbuf {
size_t length, pool;
char *str;
};
static struct apbuf *make_apbuf(void) {
struct apbuf *buf = xmalloc(sizeof(struct apbuf));
buf->length = 0;
buf->pool = APBUF_INIT;
buf->str = xmalloc(buf->pool);
return buf;
}
/* Append s (of length len) to buf. */
static void appendl(struct apbuf *buf, const char *s, const size_t len) {
size_t need = buf->length + len;
if (buf->pool < need) {
/* pool has dried up */
while (buf->pool < need)
buf->pool += APBUF_GROW;
buf->str = xrealloc(buf->str, buf->pool);
}
memcpy(buf->str + buf->length, s, len);
buf->length += len;
}
#ifdef __GNUC__
#define append(buf, s) appendl(buf, s, \
(__builtin_constant_p(s) ? sizeof(s)-1 : strlen(s)) )
#else
static void append(struct apbuf *buf, const char *s) {
appendl(buf, s, strlen(s));
}
#endif
static void appendf(struct apbuf *buf, const char *format, ...)
__printflike(2, 3);
static void appendf(struct apbuf *buf, const char *format, ...) {
char *tmp;
va_list va;
size_t len;
va_start(va, format);
len = xvasprintf(&tmp, format, va);
va_end(va);
appendl(buf, tmp, len);
free(tmp);
}
/* Make the specified socket non-blocking. */
static void nonblock_socket(const int sock) {
int flags = fcntl(sock, F_GETFL);
if (flags == -1)
err(1, "fcntl(F_GETFL)");
flags |= O_NONBLOCK;
if (fcntl(sock, F_SETFL, flags) == -1)
err(1, "fcntl() to set O_NONBLOCK");
}
/* Split string out of src with range [left:right-1] */
static char *split_string(const char *src,
const size_t left, const size_t right) {
char *dest;
assert(left <= right);
assert(left < strlen(src)); /* [left means must be smaller */
assert(right <= strlen(src)); /* right) means can be equal or smaller */
dest = xmalloc(right - left + 1);
memcpy(dest, src+left, right-left);
dest[right-left] = '\0';
return dest;
}
/* Resolve /./ and /../ in a URL, in-place.
* Returns NULL if the URL is invalid/unsafe, or the original buffer if
* successful.
*/
static char *make_safe_url(char *const url) {
char *src = url, *dst;
#define ends(c) ((c) == '/' || (c) == '\0')
/* URLs not starting with a slash are illegal. */
if (*src != '/')
return NULL;
/* Fast case: skip until first double-slash or dot-dir. */
for ( ; *src; ++src) {
if (*src == '/') {
if (src[1] == '/')
break;
else if (src[1] == '.') {
if (ends(src[2]))
break;
else if (src[2] == '.' && ends(src[3]))
break;
}
}
}
/* Copy to dst, while collapsing multi-slashes and handling dot-dirs. */
dst = src;
while (*src) {
if (*src != '/')
*dst++ = *src++;
else if (*++src == '/')
;
else if (*src != '.')
*dst++ = '/';
else if (ends(src[1]))
/* Ignore single-dot component. */
++src;
else if (src[1] == '.' && ends(src[2])) {
/* Double-dot component. */
src += 2;
if (dst == url)
return NULL; /* Illegal URL */
else
/* Backtrack to previous slash. */
while (*--dst != '/' && dst > url);
}
else
*dst++ = '/';
}
if (dst == url)
++dst;
*dst = '\0';
return url;
#undef ends
}
static void add_forward_mapping(const char * const host,
const char * const target_url) {
forward_map_size++;
forward_map = xrealloc(forward_map,
sizeof(*forward_map) * forward_map_size);
forward_map[forward_map_size - 1].host = host;
forward_map[forward_map_size - 1].target_url = target_url;
}
/* Associates an extension with a mimetype in the mime_map. Entries are in
* unsorted order. Makes copies of extension and mimetype strings.
*/
static void add_mime_mapping(const char *extension, const char *mimetype) {
size_t i;
assert(strlen(extension) > 0);
assert(strlen(mimetype) > 0);
/* update longest_ext */
i = strlen(extension);
if (i > longest_ext)
longest_ext = i;
/* look through list and replace an existing entry if possible */
for (i = 0; i < mime_map_size; i++)
if (strcmp(mime_map[i].extension, extension) == 0) {
free(mime_map[i].mimetype);
mime_map[i].mimetype = xstrdup(mimetype);
return;
}
/* no replacement - add a new entry */
mime_map_size++;
mime_map = xrealloc(mime_map,
sizeof(struct mime_mapping) * mime_map_size);
mime_map[mime_map_size - 1].extension = xstrdup(extension);
mime_map[mime_map_size - 1].mimetype = xstrdup(mimetype);
}
/* qsort() the mime_map. The map must be sorted before it can be
* binary-searched.
*/
static int mime_mapping_cmp(const void *a, const void *b) {
return strcmp(((const struct mime_mapping *)a)->extension,
((const struct mime_mapping *)b)->extension);
}
static void sort_mime_map(void) {
qsort(mime_map, mime_map_size, sizeof(struct mime_mapping),
mime_mapping_cmp);
}
/* Parses a mime.types line and adds the parsed data to the mime_map. */
static void parse_mimetype_line(const char *line) {
unsigned int pad, bound1, lbound, rbound;
/* parse mimetype */
for (pad=0; (line[pad] == ' ') || (line[pad] == '\t'); pad++)
;
if (line[pad] == '\0' || /* empty line */
line[pad] == '#') /* comment */
return;
for (bound1=pad+1;
(line[bound1] != ' ') &&
(line[bound1] != '\t');
bound1++) {
if (line[bound1] == '\0')
return; /* malformed line */
}
lbound = bound1;
for (;;) {
char *mimetype, *extension;
/* find beginning of extension */
for (; (line[lbound] == ' ') || (line[lbound] == '\t'); lbound++)
;
if (line[lbound] == '\0')
return; /* end of line */
/* find end of extension */
for (rbound = lbound;
line[rbound] != ' ' &&
line[rbound] != '\t' &&
line[rbound] != '\0';
rbound++)
;
mimetype = split_string(line, pad, bound1);
extension = split_string(line, lbound, rbound);
add_mime_mapping(extension, mimetype);
free(mimetype);
free(extension);
if (line[rbound] == '\0')
return; /* end of line */
else
lbound = rbound + 1;
}
}
/* Adds contents of default_extension_map[] to mime_map list. The array must
* be NULL terminated.
*/
static void parse_default_extension_map(void) {
size_t i;
for (i = 0; default_extension_map[i] != NULL; i++)
parse_mimetype_line(default_extension_map[i]);
}
/* read a line from fp, return its contents in a dynamically allocated buffer,
* not including the line ending.
*
* Handles CR, CRLF and LF line endings, as well as NOEOL correctly. If
* already at EOF, returns NULL. Will err() or errx() in case of
* unexpected file error or running out of memory.
*/
static char *read_line(FILE *fp) {
char *buf;
long startpos, endpos;
size_t linelen, numread;
int c;
startpos = ftell(fp);
if (startpos == -1)
err(1, "ftell()");
/* find end of line (or file) */
linelen = 0;
for (;;) {
c = fgetc(fp);
if ((c == EOF) || (c == (int)'\n') || (c == (int)'\r'))
break;
linelen++;
}
/* return NULL on EOF (and empty line) */
if (linelen == 0 && c == EOF)
return NULL;
endpos = ftell(fp);
if (endpos == -1)
err(1, "ftell()");
/* skip CRLF */
if ((c == (int)'\r') && (fgetc(fp) == (int)'\n'))
endpos++;
buf = xmalloc(linelen + 1);
/* rewind file to where the line stared and load the line */
if (fseek(fp, startpos, SEEK_SET) == -1)
err(1, "fseek()");
numread = fread(buf, 1, linelen, fp);
if (numread != linelen)
errx(1, "fread() %zu bytes, expecting %zu bytes", numread, linelen);
/* terminate buffer */
buf[linelen] = 0;
/* advance file pointer over the endline */
if (fseek(fp, endpos, SEEK_SET) == -1)
err(1, "fseek()");
return buf;
}
/* ---------------------------------------------------------------------------
* Adds contents of specified file to mime_map list.
*/
static void parse_extension_map_file(const char *filename) {
char *buf;
FILE *fp = fopen(filename, "rb");
if (fp == NULL)
err(1, "fopen(\"%s\")", filename);
while ((buf = read_line(fp)) != NULL) {
parse_mimetype_line(buf);
free(buf);
}
fclose(fp);
}
/* Uses the mime_map to determine a Content-Type: for a requested URL. This
* bsearch()es mime_map, so make sure it's sorted first.
*/
static int mime_mapping_cmp_str(const void *a, const void *b) {
return strcmp((const char *)a,
((const struct mime_mapping *)b)->extension);
}
static const char *url_content_type(const char *url) {
int period, urllen = (int)strlen(url);
for (period = urllen - 1;
(period > 0) && (url[period] != '.') &&
(urllen - period - 1 <= (int)longest_ext);
period--)
;
if ((period >= 0) && (url[period] == '.')) {
struct mime_mapping *result =
bsearch((url + period + 1), mime_map, mime_map_size,
sizeof(struct mime_mapping), mime_mapping_cmp_str);
if (result != NULL) {
assert(strcmp(url + period + 1, result->extension) == 0);
return result->mimetype;
}
}
/* else no period found in the string */
return default_mimetype;
}
static const char *get_address_text(const void *addr) {
#ifdef HAVE_INET6
if (inet6) {
static char text_addr[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, (const struct in6_addr *)addr, text_addr,
INET6_ADDRSTRLEN);
return text_addr;
} else
#endif
{
return inet_ntoa(*(const struct in_addr *)addr);
}
}
/* Initialize the sockin global. This is the socket that we accept
* connections from.
*/
static void init_sockin(void) {
struct sockaddr_in addrin;
#ifdef HAVE_INET6
struct sockaddr_in6 addrin6;
#endif
socklen_t addrin_len;
int sockopt;
#ifdef HAVE_INET6
if (inet6) {
memset(&addrin6, 0, sizeof(addrin6));
if (inet_pton(AF_INET6, bindaddr ? bindaddr : "::",
&addrin6.sin6_addr) != 1) {
errx(1, "malformed --addr argument");
}
sockin = socket(PF_INET6, SOCK_STREAM, 0);
} else
#endif
{
memset(&addrin, 0, sizeof(addrin));
addrin.sin_addr.s_addr = bindaddr ? inet_addr(bindaddr) : INADDR_ANY;
if (addrin.sin_addr.s_addr == (in_addr_t)INADDR_NONE)
errx(1, "malformed --addr argument");
sockin = socket(PF_INET, SOCK_STREAM, 0);
}
if (sockin == -1)
err(1, "socket()");
/* reuse address */
sockopt = 1;
if (setsockopt(sockin, SOL_SOCKET, SO_REUSEADDR,
&sockopt, sizeof(sockopt)) == -1)
err(1, "setsockopt(SO_REUSEADDR)");
/* disable Nagle since we buffer everything ourselves */
sockopt = 1;
if (setsockopt(sockin, IPPROTO_TCP, TCP_NODELAY,
&sockopt, sizeof(sockopt)) == -1)
err(1, "setsockopt(TCP_NODELAY)");
#ifdef HAVE_INET6
if (inet6) {
/* Listen on IPv4 and IPv6 on the same socket. */
/* Only relevant if listening on ::, but behaves normally if */
/* listening on a specific address. */
sockopt = 0;
if (setsockopt(sockin, IPPROTO_IPV6, IPV6_V6ONLY,
&sockopt, sizeof (sockopt)) < 0)
err(1, "setsockopt (IPV6_V6ONLY)");
}
#endif
#ifdef TORTURE
/* torture: cripple the kernel-side send buffer so we can only squeeze out
* one byte at a time (this is for debugging)
*/
sockopt = 1;
if (setsockopt(sockin, SOL_SOCKET, SO_SNDBUF,
&sockopt, sizeof(sockopt)) == -1)
err(1, "setsockopt(SO_SNDBUF)");
#endif
/* bind socket */
#ifdef HAVE_INET6
if (inet6) {
addrin6.sin6_family = AF_INET6;
addrin6.sin6_port = htons(bindport);
if (bind(sockin, (struct sockaddr *)&addrin6,
sizeof(struct sockaddr_in6)) == -1)
err(1, "bind(port %u)", bindport);
addrin_len = sizeof(addrin6);
if (getsockname(sockin, (struct sockaddr *)&addrin6, &addrin_len) == -1)
err(1, "getsockname()");
printf("listening on: http://[%s]:%u/\n",
get_address_text(&addrin6.sin6_addr), bindport);
} else
#endif
{
addrin.sin_family = (u_char)PF_INET;
addrin.sin_port = htons(bindport);
if (bind(sockin, (struct sockaddr *)&addrin,
sizeof(struct sockaddr_in)) == -1)
err(1, "bind(port %u)", bindport);
addrin_len = sizeof(addrin);
if (getsockname(sockin, (struct sockaddr *)&addrin, &addrin_len) == -1)
err(1, "getsockname()");
printf("listening on: http://%s:%u/\n",
get_address_text(&addrin.sin_addr), bindport);
}
/* listen on socket */
if (listen(sockin, max_connections) == -1)
err(1, "listen()");
/* enable acceptfilter (this is only available on FreeBSD) */
if (want_accf) {
#if defined(__FreeBSD__)
struct accept_filter_arg filt = {"httpready", ""};
if (setsockopt(sockin, SOL_SOCKET, SO_ACCEPTFILTER,
&filt, sizeof(filt)) == -1)
fprintf(stderr, "cannot enable acceptfilter: %s\n",
strerror(errno));
else
printf("enabled acceptfilter\n");
#else
printf("this platform doesn't support acceptfilter\n");
#endif
}
}
static void usage(const char *argv0) {
printf("usage:\t%s /path/to/wwwroot [flags]\n\n", argv0);
printf("flags:\t--port number (default: %u, or 80 if running as root)\n"
"\t\tSpecifies which port to listen on for connections.\n"
"\t\tPass 0 to let the system choose any free port for you.\n\n", bindport);
printf("\t--addr ip (default: all)\n"
"\t\tIf multiple interfaces are present, specifies\n"
"\t\twhich one to bind the listening port to.\n\n");
printf("\t--maxconn number (default: system maximum)\n"
"\t\tSpecifies how many concurrent connections to accept.\n\n");
printf("\t--log filename (default: stdout)\n"
"\t\tSpecifies which file to append the request log to.\n\n");
printf("\t--syslog\n"
"\t\tUse syslog for request log.\n\n");
printf("\t--chroot (default: don't chroot)\n"
"\t\tLocks server into wwwroot directory for added security.\n\n");
printf("\t--daemon (default: don't daemonize)\n"
"\t\tDetach from the controlling terminal and run in the background.\n\n");
printf("\t--index filename (default: %s)\n"
"\t\tDefault file to serve when a directory is requested.\n\n",
index_name);
printf("\t--no-listing\n"
"\t\tDo not serve listing if directory is requested.\n\n");
printf("\t--mimetypes filename (optional)\n"
"\t\tParses specified file for extension-MIME associations.\n\n");
printf("\t--default-mimetype string (optional, default: %s)\n"
"\t\tFiles with unknown extensions are served as this mimetype.\n\n",
octet_stream);
printf("\t--uid uid/uname, --gid gid/gname (default: don't privdrop)\n"
"\t\tDrops privileges to given uid:gid after initialization.\n\n");
printf("\t--pidfile filename (default: no pidfile)\n"
"\t\tWrite PID to the specified file. Note that if you are\n"
"\t\tusing --chroot, then the pidfile must be relative to,\n"
"\t\tand inside the wwwroot.\n\n");
printf("\t--no-keepalive\n"
"\t\tDisables HTTP Keep-Alive functionality.\n\n");
#ifdef __FreeBSD__
printf("\t--accf (default: don't use acceptfilter)\n"
"\t\tUse acceptfilter. Needs the accf_http module loaded.\n\n");
#endif
printf("\t--forward host url (default: don't forward)\n"
"\t\tWeb forward (301 redirect).\n"
"\t\tRequests to the host are redirected to the corresponding url.\n"
"\t\tThe option may be specified multiple times, in which case\n"
"\t\tthe host is matched in order of appearance.\n\n");
printf("\t--forward-all url (default: don't forward)\n"
"\t\tWeb forward (301 redirect).\n"
"\t\tAll requests are redirected to the corresponding url.\n\n");
printf("\t--no-server-id\n"
"\t\tDon't identify the server type in headers\n"
"\t\tor directory listings.\n\n");
printf("\t--timeout secs (default: %d)\n"
"\t\tIf a connection is idle for more than this many seconds,\n"
"\t\tit will be closed. Set to zero to disable timeouts.\n\n",
timeout_secs);
printf("\t--auth username:password\n"
"\t\tEnable basic authentication. This is *INSECURE*: passwords\n"
"\t\tare sent unencrypted over HTTP, plus the password is visible\n"
"\t\tin ps(1) to other users on the system.\n\n");
printf("\t--forward-https\n"
"\t\tIf the client requested HTTP, forward to HTTPS.\n"
"\t\tThis is useful if darkhttpd is behind a reverse proxy\n"
"\t\tthat supports SSL.\n\n");
printf("\t--header 'Header: Value'\n"
"\t\tAdd a custom header to all responses.\n"
"\t\tThis option can be specified multiple times, in which case\n"
"\t\tthe headers are added in order of appearance.\n\n");
#ifdef HAVE_INET6
printf("\t--ipv6\n"
"\t\tListen on IPv6 address.\n\n");
#else
printf("\t(This binary was built without IPv6 support: -DNO_IPV6)\n\n");
#endif
}
static char *base64_encode(char *str) {
const char base64_table[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',