1 files changed, 395 insertions, 0 deletions
diff --git a/package/uhttpd/src/uhttpd-file.c b/package/uhttpd/src/uhttpd-file.c
new file mode 100644
index 0000000000..2a06f85206
--- /dev/null
+++ b/package/uhttpd/src/uhttpd-file.c
@@ -0,0 +1,395 @@
+/*
+ * uhttpd - Tiny single-threaded httpd - Static file handler
+ *
+ *   Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#define _XOPEN_SOURCE 500	/* strptime() */
+#define _BSD_SOURCE			/* scandir(), timegm() */
+
+#include "uhttpd.h"
+#include "uhttpd-utils.h"
+#include "uhttpd-file.h"
+
+#include "uhttpd-mimetypes.h"
+
+
+static const char * uh_file_mime_lookup(const char *path)
+{
+	struct mimetype *m = &uh_mime_types[0];
+	char *p, *pd, *ps;
+
+	ps = strrchr(path, '/');
+	pd = strrchr(path, '.');
+
+	/* use either slash or dot as separator, whatever comes last */
+	p = (ps && pd && (ps > pd)) ? ps : pd;
+
+	if( (p != NULL) && (*(++p) != 0) )
+	{
+		while( m->extn )
+		{
+			if( ! strcasecmp(p, m->extn) )
+				return m->mime;
+
+			m++;
+		}
+	}
+
+	return "application/octet-stream";
+}
+
+static const char * uh_file_mktag(struct stat *s)
+{
+	static char tag[128];
+
+	snprintf(tag, sizeof(tag), "\"%x-%x-%x\"",
+		(unsigned int) s->st_ino,
+		(unsigned int) s->st_size,
+		(unsigned int) s->st_mtime
+	);
+
+	return tag;
+}
+
+static time_t uh_file_date2unix(const char *date)
+{
+	struct tm t;
+
+	memset(&t, 0, sizeof(t));
+
+	if( strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL )
+		return timegm(&t);
+
+	return 0;
+}
+
+static char * uh_file_unix2date(time_t ts)
+{
+	static char str[128];
+	struct tm *t = gmtime(&ts);
+
+	strftime(str, sizeof(str), "%a, %d %b %Y %H:%M:%S GMT", t);
+
+	return str;
+}
+
+static char * uh_file_header_lookup(struct http_request *req, const char *name)
+{
+	int i;
+
+	foreach_header(i, req->headers)
+	{
+		if( ! strcasecmp(req->headers[i], name) )
+			return req->headers[i+1];
+	}
+
+	return NULL;
+}
+
+static void uh_file_response_ok_hdrs(struct client *cl, struct http_request *req, struct stat *s)
+{
+	uh_http_sendf(cl, NULL, "Connection: close\r\n");
+
+	if( s )
+	{
+		uh_http_sendf(cl, NULL, "ETag: %s\r\n", uh_file_mktag(s));
+		uh_http_sendf(cl, NULL, "Last-Modified: %s\r\n", uh_file_unix2date(s->st_mtime));
+	}
+
+	uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)));
+}
+
+static void uh_file_response_200(struct client *cl, struct http_request *req, struct stat *s)
+{
+	uh_http_sendf(cl, NULL, "HTTP/%.1f 200 OK\r\n", req->version);
+	uh_file_response_ok_hdrs(cl, req, s);
+}
+
+static void uh_file_response_304(struct client *cl, struct http_request *req, struct stat *s)
+{
+	uh_http_sendf(cl, NULL, "HTTP/%.1f 304 Not Modified\r\n", req->version);
+	uh_file_response_ok_hdrs(cl, req, s);
+}
+
+static void uh_file_response_412(struct client *cl, struct http_request *req)
+{
+	uh_http_sendf(cl, NULL,
+		"HTTP/%.1f 412 Precondition Failed\r\n"
+		"Connection: close\r\n", req->version);
+}
+
+static int uh_file_if_match(struct client *cl, struct http_request *req, struct stat *s)
+{
+	const char *tag = uh_file_mktag(s);
+	char *hdr = uh_file_header_lookup(req, "If-Match");
+	char *p;
+	int i;
+
+	if( hdr )
+	{
+		p = &hdr[0];
+
+		for( i = 0; i < strlen(hdr); i++ )
+		{
+			if( (hdr[i] == ' ') || (hdr[i] == ',') )
+			{
+				hdr[i++] = 0;
+				p = &hdr[i];
+			}
+			else if( !strcmp(p, "*") || !strcmp(p, tag) )
+			{
+				return 1;
+			}
+		}
+
+		uh_file_response_412(cl, req);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int uh_file_if_modified_since(struct client *cl, struct http_request *req, struct stat *s)
+{
+	char *hdr = uh_file_header_lookup(req, "If-Modified-Since");
+
+	if( hdr )
+	{
+		if( uh_file_date2unix(hdr) < s->st_mtime )
+		{
+			return 1;
+		}
+		else
+		{
+			uh_file_response_304(cl, req, s);
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+static int uh_file_if_none_match(struct client *cl, struct http_request *req, struct stat *s)
+{
+	const char *tag = uh_file_mktag(s);
+	char *hdr = uh_file_header_lookup(req, "If-None-Match");
+	char *p;
+	int i;
+
+	if( hdr )
+	{
+		p = &hdr[0];
+
+		for( i = 0; i < strlen(hdr); i++ )
+		{
+			if( (hdr[i] == ' ') || (hdr[i] == ',') )
+			{
+				hdr[i++] = 0;
+				p = &hdr[i];
+			}
+			else if( !strcmp(p, "*") || !strcmp(p, tag) )
+			{
+				if( (req->method == UH_HTTP_MSG_GET) ||
+				    (req->method == UH_HTTP_MSG_HEAD) )
+					uh_file_response_304(cl, req, s);
+				else
+					uh_file_response_412(cl, req);
+
+				return 0;
+			}
+		}
+	}
+
+	return 1;
+}
+
+static int uh_file_if_range(struct client *cl, struct http_request *req, struct stat *s)
+{
+	char *hdr = uh_file_header_lookup(req, "If-Range");
+
+	if( hdr )
+	{
+		uh_file_response_412(cl, req);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int uh_file_if_unmodified_since(struct client *cl, struct http_request *req, struct stat *s)
+{
+	char *hdr = uh_file_header_lookup(req, "If-Unmodified-Since");
+
+	if( hdr )
+	{
+		if( uh_file_date2unix(hdr) <= s->st_mtime )
+		{
+			uh_file_response_412(cl, req);
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+
+static int uh_file_scandir_filter_dir(const struct dirent *e)
+{
+	return strcmp(e->d_name, ".") ? 1 : 0;
+}
+
+static void uh_file_dirlist(struct client *cl, struct http_request *req, struct path_info *pi)
+{
+	int i, count;
+	char filename[PATH_MAX];
+	char *pathptr;
+	struct dirent **files = NULL;
+	struct stat s;
+
+	uh_http_sendf(cl, req,
+		"<html><head><title>Index of %s</title></head>"
+		"<body><h1>Index of %s</h1><hr /><ol>",
+			pi->name, pi->name
+	);
+
+	if( (count = scandir(pi->phys, &files, uh_file_scandir_filter_dir, alphasort)) > 0 )
+	{
+		memset(filename, 0, sizeof(filename));
+		memcpy(filename, pi->phys, sizeof(filename));
+		pathptr = &filename[strlen(filename)];
+
+		/* list subdirs */
+		for( i = 0; i < count; i++ )
+		{
+			strncat(filename, files[i]->d_name,
+				sizeof(filename) - strlen(files[i]->d_name));
+
+			if( !stat(filename, &s) && (s.st_mode & S_IFDIR) )
+				uh_http_sendf(cl, req,
+					"<li><strong><a href='%s%s'>%s</a>/</strong><br />"
+					"<small>modified: %s<br />directory - %.02f kbyte"
+					"<br /><br /></small></li>",
+						pi->name, files[i]->d_name, files[i]->d_name,
+						uh_file_unix2date(s.st_mtime), s.st_size / 1024.0
+				);
+
+			*pathptr = 0;
+		}
+
+		/* list files */
+		for( i = 0; i < count; i++ )
+		{
+			strncat(filename, files[i]->d_name,
+				sizeof(filename) - strlen(files[i]->d_name));
+
+			if( !stat(filename, &s) && !(s.st_mode & S_IFDIR) )
+				uh_http_sendf(cl, req,
+					"<li><strong><a href='%s%s'>%s</a></strong><br />"
+					"<small>modified: %s<br />%s - %.02f kbyte<br />"
+					"<br /></small></li>",
+						pi->name, files[i]->d_name, files[i]->d_name,
+						uh_file_unix2date(s.st_mtime),
+						uh_file_mime_lookup(filename), s.st_size / 1024.0
+				);
+
+			*pathptr = 0;
+			free(files[i]);
+		}
+	}
+
+	free(files);
+
+	uh_http_sendf(cl, req, "</ol><hr /></body></html>");
+	uh_http_sendf(cl, req, "");
+}
+
+
+void uh_file_request(struct client *cl, struct http_request *req, struct path_info *pi)
+{
+	int fd, rlen;
+	char buf[UH_LIMIT_MSGHEAD];
+
+	/* we have a file */
+	if( (pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0) )
+	{
+		/* test preconditions */
+		if(
+			uh_file_if_modified_since(cl, req, &pi->stat)  	&&
+			uh_file_if_match(cl, req, &pi->stat)           	&&
+			uh_file_if_range(cl, req, &pi->stat)           	&&
+			uh_file_if_unmodified_since(cl, req, &pi->stat)	&&
+			uh_file_if_none_match(cl, req, &pi->stat)
+		) {
+			/* write status */
+			uh_file_response_200(cl, req, &pi->stat);
+
+			uh_http_sendf(cl, NULL, "Content-Type: %s\r\n", uh_file_mime_lookup(pi->name));
+			uh_http_sendf(cl, NULL, "Content-Length: %i\r\n", pi->stat.st_size);
+
+			/* if request was HTTP 1.1 we'll respond chunked */
+			if( (req->version > 1.0) && (req->method != UH_HTTP_MSG_HEAD) )
+				uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1);
+
+			/* close header */
+			uh_http_send(cl, NULL, "\r\n", -1);
+
+			/* send body */
+			if( req->method != UH_HTTP_MSG_HEAD )
+			{
+				/* pump file data */
+				while( (rlen = read(fd, buf, sizeof(buf))) > 0 )
+				{
+					if( uh_http_send(cl, req, buf, rlen) < 0 )
+						break;
+				}
+
+				/* send trailer in chunked mode */
+				uh_http_send(cl, req, "", 0);
+			}
+		}
+
+		/* one of the preconditions failed, terminate opened header and exit */
+		else
+		{
+			uh_http_send(cl, NULL, "\r\n", -1);
+		}
+
+		close(fd);
+	}
+
+	/* directory */
+	else if( pi->stat.st_mode & S_IFDIR )
+	{
+		/* write status */
+		uh_file_response_200(cl, req, NULL);
+
+		if( req->version > 1.0 )
+			uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1);
+
+		uh_http_send(cl, NULL, "Content-Type: text/html\r\n\r\n", -1);
+
+		/* content */
+		uh_file_dirlist(cl, req, pi);
+	}
+
+	/* 403 */
+	else
+	{
+		uh_http_sendhf(cl, 403, "Forbidden",
+			"Access to this resource is forbidden");
+	}
+}
+