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/* httpd.c - Web server.
*
* Copyright 2022 Rob Landley <rob@landley.net>
*
* See https://www.ietf.org/rfc/rfc2616.txt
*
* TODO: multiple domains, https, actual inetd with ratelimit...
* range, gzip, ETag (If-None-Match:, Last-Modified:), Date:
* "Accept-Ranges: bytes"/"Range: bytes=xxx-[yyy]"
* .htaccess (auth, forward)
* optional conf file, error pages
* -ifv -p [IP:]PORT -u [USER][:GRP] -c CFGFILE
* cgi: SERVER_PORT SERVER_NAME REMOTE_ADDR REMOTE_HOST REQUEST_METHOD
USE_HTTPD(NEWTOY(httpd, ">1v", TOYFLAG_USR|TOYFLAG_BIN))
config HTTPD
bool "httpd"
default y
help
usage: httpd [-e STR] [DIR]
Serve contents of directory as static web pages.
-e Escape STR as URL, printing result and exiting.
-d Decode escaped STR, printing result and exiting.
-v Verbose
*/
#define FOR_httpd
#include "toys.h"
char *rfc1123(char *buf, time_t t)
{
strftime(buf, 64, "%a, %d %b %Y %T GMT", gmtime(&t));
return buf;
}
// She never told me...
char *mime(char *file)
{
char *s = strrchr(file, '.'), *types[] = {
"asc\0text/plain", "bin\0application/octet-stream", "bmp\0image/bmp",
"cpio\0application/x-cpio", "css\0text/css", "doc\0application/msword",
"dtd\0text/xml", "dvi\0application/x-dvi", "gif\0image/gif",
"htm\0text/html", "html\0text/html", "jar\0applicat/x-java-archive",
"jpeg\0image/jpeg", "jpg\0image/jpeg", "js\0application/x-javascript",
"mp3\0audio/mpeg", "mp4\0video/mp4", "mpg\0video/mpeg",
"ogg\0application/ogg", "pbm\0image/x-portable-bitmap",
"pdf\0application/pdf", "png\0image/png",
"ppt\0application/vnd.ms-powerpoint", "ps\0application/postscript",
"rtf\0text/rtf", "sgml\0text/sgml", "svg\0image/svg+xml",
"tar\0application/x-tar", "tex\0application/x-tex", "tiff\0image/tiff",
"txt\0text/plain", "wav\0audio/x-wav", "xls\0application/vnd.ms-excel",
"xml\0tet/xml", "zip\0application/zip"
};
int i;
strcpy(toybuf, "text/plain");
if (s++) for (i = 0; i<ARRAY_LEN(types); i++) {
if (strcasecmp(s, types[i])) continue;
strcpy(toybuf, types[i]+strlen(types[i])+1);
break;
}
if (!strncmp(toybuf, "text/", 5)) strcat(toybuf, "; charset=UTF-8");
return toybuf;
}
// Stop: header time.
static void header_time(int stat, char *str, char *more)
{
char buf[64];
if (!more) more = "";
if (FLAG(v)) dprintf(2, "REPLY: %d %s\n%s\n", stat, str, more);
xprintf("HTTP/1.1 %d %s\r\nServer: toybox httpd/%s\r\nDate: %s\r\n%s"
"Connection: close\r\n\r\n", stat, str, TOYBOX_VERSION,
rfc1123(buf, time(0)), more);
}
static void error_time(int stat, char *str)
{
header_time(stat, str, 0);
xprintf("<html><head><title>%d %s</title></head>"
"<body><h3>%d %s</h3></body></html>", stat, str, stat, str);
}
static int isunder(char *file, char *dir)
{
char *s1 = xabspath(dir, ABS_FILE), *s2 = xabspath(file, 0), *ss = s2;
int rc = s1 && s2 && strstart(&ss, s1) && (!*ss || *ss=='/' || ss[-1]=='/');
free(s2);
free(s1);
return rc;
}
// Handle a connection on fd
void handle(int infd, int outfd)
{
FILE *fp = fdopen(infd, "r");
char *s = xgetline(fp), *cut, *ss, *esc, *path, *word[3];
int i = sizeof(toybuf), fd;
if (!s) return;
if (!getsockname(0, (void *)&toybuf, &i)) {
if (FLAG(v))
dprintf(2, "Hello %s\n%s\n", ntop((void *)toybuf), s);
}
// Split line into method/path/protocol
for (i = 0, ss = s;;) {
word[i++] = ss;
while (*ss && !strchr(" \r\n", *ss)) ss++;
while (*ss && strchr(" \r\n", *ss)) *(ss++) = 0;
if (i==3) break;
if (!*ss) return header_time(400, "Bad Request", 0);
}
// Process additional http/1.1 lines
while ((ss = xgetline(fp))) {
i = *chomp(ss);
if (FLAG(v)) dprintf(2, "%s\n", ss);
// TODO: any of
//User-Agent: Wget/1.20.1 (linux-gnu) - do we want to log anything?
//Accept: */* - 406 Too Snobbish
//Accept-Encoding: identity - we can gzip?
//Host: landley.net - we could handle multiple domains?
//Connection: Keep-Alive - probably don't care
free(ss);
if (!i) break;
}
if (!strcasecmp(word[0], "get")) {
struct stat st;
if (*(ss = word[1])!='/') error_time(400, "Bad Request");
while (*ss=='/') ss++;
if (!*ss) ss = "./";
else if ((cut = unescape_url(ss, 1))) setenv("QUERY_STRING", cut, 1);
// TODO domain.com:/path/to/blah domain2.com:/path/to/that
// TODO cgi PATH_INFO /path/to/filename.cgi/and/more/stuff?path&info
if (!isunder(ss, ".") || stat(ss, &st)) error_time(404, "Not Found");
else if (-1 == (fd = open(ss, O_RDONLY))) error_time(403, "Forbidden");
else if (!S_ISDIR(st.st_mode)) {
char buf[64];
file:
header_time(200, "Ok", ss = xmprintf("Content-Type: %s\r\n"
"Content-Length: %lld\r\nLast-Modified: %s\r\n",
mime(ss), (long long)st.st_size, rfc1123(buf, st.st_mtime)));
free(ss);
xsendfile(fd, outfd);
} else if (ss[strlen(ss)-1]!='/') {
header_time(302, "Found", path = xmprintf("Location: %s/\r\n", word[1]));
free(path);
} else {
DIR *dd;
struct dirent *dir;
// Do we have an index.html?
path = ss;
ss = "index.html";
path = xmprintf("%s%s", path, ss);
if (stat(path, &st) || !S_ISREG(st.st_mode)) i = -1;
else if (-1 == (i = open(path, O_RDONLY))) error_time(403, "Forbidden");
free(path);
if (i != -1) {
close(fd);
fd = i;
goto file;
}
// List directory contents
header_time(200, "Ok", "Content-Type: text/html\r\n");
dprintf(outfd, "<html><head><title>Index of %s</title></head>\n"
"<body><h3>Index of %s</h3></body>\n", word[1], word[1]);
for (dd = fdopendir(fd); (dir = readdir(dd));) {
esc = escape_url(dir->d_name, "<>&\"");
dprintf(outfd, "<a href=\"%s\">%s</a><br />\n", esc, esc);
free(esc);
}
dprintf(outfd, "</body></html>\n");
}
} else error_time(501, "Not Implemented");
free(s);
}
void httpd_main(void)
{
if (toys.optc && chdir(*toys.optargs))
return error_time(500, "Internal Error");
// inetd only at the moment
handle(0, 1);
}
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