add uhttpd (moved from LuCI trunk)
SVN-Revision: 20428
This commit is contained in:
Jo-Philipp Wich
749
package/uhttpd/src/uhttpd-utils.c
Normal file
749
package/uhttpd/src/uhttpd-utils.c
Normal file
@@ -0,0 +1,749 @@
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/*
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* uhttpd - Tiny single-threaded httpd - Utility functions
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*
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* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define _XOPEN_SOURCE 500 /* crypt() */
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#define _BSD_SOURCE /* strcasecmp(), strncasecmp() */
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#include "uhttpd.h"
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#include "uhttpd-utils.h"
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#ifdef HAVE_TLS
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#include "uhttpd-tls.h"
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#endif
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static char *uh_index_files[] = {
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"index.html",
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"index.htm",
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"default.html",
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"default.htm"
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};
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const char * sa_straddr(void *sa)
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{
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static char str[INET6_ADDRSTRLEN];
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struct sockaddr_in *v4 = (struct sockaddr_in *)sa;
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struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)sa;
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if( v4->sin_family == AF_INET )
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return inet_ntop(AF_INET, &(v4->sin_addr), str, sizeof(str));
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else
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return inet_ntop(AF_INET6, &(v6->sin6_addr), str, sizeof(str));
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}
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const char * sa_strport(void *sa)
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{
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static char str[6];
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snprintf(str, sizeof(str), "%i", sa_port(sa));
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return str;
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}
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int sa_port(void *sa)
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{
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return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
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}
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/* Simple strstr() like function that takes len arguments for both haystack and needle. */
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char *strfind(char *haystack, int hslen, const char *needle, int ndlen)
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{
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int match = 0;
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int i, j;
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for( i = 0; i < hslen; i++ )
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{
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if( haystack[i] == needle[0] )
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{
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match = ((ndlen == 1) || ((i + ndlen) <= hslen));
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for( j = 1; (j < ndlen) && ((i + j) < hslen); j++ )
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{
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if( haystack[i+j] != needle[j] )
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{
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match = 0;
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break;
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}
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}
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if( match )
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return &haystack[i];
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}
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}
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return NULL;
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}
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int uh_tcp_send(struct client *cl, const char *buf, int len)
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{
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fd_set writer;
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struct timeval timeout;
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FD_ZERO(&writer);
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FD_SET(cl->socket, &writer);
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timeout.tv_sec = 0;
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timeout.tv_usec = 500000;
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if( select(cl->socket + 1, NULL, &writer, NULL, &timeout) > 0 )
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{
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#ifdef HAVE_TLS
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if( cl->tls )
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return cl->server->conf->tls_send(cl, (void *)buf, len);
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else
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#endif
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return send(cl->socket, buf, len, 0);
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}
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return -1;
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}
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int uh_tcp_peek(struct client *cl, char *buf, int len)
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{
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int sz = uh_tcp_recv(cl, buf, len);
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/* store received data in peek buffer */
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if( sz > 0 )
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{
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cl->peeklen = sz;
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memcpy(cl->peekbuf, buf, sz);
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}
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return sz;
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}
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int uh_tcp_recv(struct client *cl, char *buf, int len)
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{
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int sz = 0;
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int rsz = 0;
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/* first serve data from peek buffer */
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if( cl->peeklen > 0 )
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{
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sz = min(cl->peeklen, len);
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len -= sz; cl->peeklen -= sz;
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memcpy(buf, cl->peekbuf, sz);
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memmove(cl->peekbuf, &cl->peekbuf[sz], cl->peeklen);
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}
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/* caller wants more */
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if( len > 0 )
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{
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#ifdef HAVE_TLS
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if( cl->tls )
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rsz = cl->server->conf->tls_recv(cl, (void *)&buf[sz], len);
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else
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#endif
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rsz = recv(cl->socket, (void *)&buf[sz], len, 0);
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if( (sz == 0) || (rsz > 0) )
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sz += rsz;
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}
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return sz;
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}
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#define ensure(x) \
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do { if( x < 0 ) return -1; } while(0)
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int uh_http_sendhf(struct client *cl, int code, const char *summary, const char *fmt, ...)
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{
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va_list ap;
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char buffer[UH_LIMIT_MSGHEAD];
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int len;
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len = snprintf(buffer, sizeof(buffer),
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"HTTP/1.1 %03i %s\r\n"
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"Connection: close\r\n"
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"Content-Type: text/plain\r\n"
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"Transfer-Encoding: chunked\r\n\r\n",
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code, summary
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);
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ensure(uh_tcp_send(cl, buffer, len));
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va_start(ap, fmt);
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len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
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va_end(ap);
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ensure(uh_http_sendc(cl, buffer, len));
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ensure(uh_http_sendc(cl, NULL, 0));
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return 0;
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}
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int uh_http_sendc(struct client *cl, const char *data, int len)
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{
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char chunk[8];
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int clen;
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if( len == -1 )
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len = strlen(data);
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if( len > 0 )
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{
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clen = snprintf(chunk, sizeof(chunk), "%X\r\n", len);
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ensure(uh_tcp_send(cl, chunk, clen));
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ensure(uh_tcp_send(cl, data, len));
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ensure(uh_tcp_send(cl, "\r\n", 2));
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}
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else
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{
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ensure(uh_tcp_send(cl, "0\r\n\r\n", 5));
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}
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return 0;
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}
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int uh_http_sendf(
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struct client *cl, struct http_request *req, const char *fmt, ...
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) {
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va_list ap;
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char buffer[UH_LIMIT_MSGHEAD];
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int len;
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va_start(ap, fmt);
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len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
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va_end(ap);
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if( (req != NULL) && (req->version > 1.0) )
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ensure(uh_http_sendc(cl, buffer, len));
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else if( len > 0 )
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ensure(uh_tcp_send(cl, buffer, len));
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return 0;
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}
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int uh_http_send(
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struct client *cl, struct http_request *req, const char *buf, int len
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) {
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if( len < 0 )
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len = strlen(buf);
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if( (req != NULL) && (req->version > 1.0) )
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ensure(uh_http_sendc(cl, buf, len));
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else if( len > 0 )
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ensure(uh_tcp_send(cl, buf, len));
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return 0;
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}
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int uh_urldecode(char *buf, int blen, const char *src, int slen)
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{
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int i;
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int len = 0;
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#define hex(x) \
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(((x) <= '9') ? ((x) - '0') : \
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(((x) <= 'F') ? ((x) - 'A' + 10) : \
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((x) - 'a' + 10)))
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for( i = 0; (i <= slen) && (i <= blen); i++ )
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{
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if( src[i] == '%' )
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{
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if( ((i+2) <= slen) && isxdigit(src[i+1]) && isxdigit(src[i+2]) )
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{
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buf[len++] = (char)(16 * hex(src[i+1]) + hex(src[i+2]));
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i += 2;
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}
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else
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{
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buf[len++] = '%';
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}
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}
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else
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{
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buf[len++] = src[i];
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}
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}
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return len;
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}
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int uh_urlencode(char *buf, int blen, const char *src, int slen)
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{
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int i;
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int len = 0;
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const char hex[] = "0123456789abcdef";
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for( i = 0; (i <= slen) && (i <= blen); i++ )
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{
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if( isalnum(src[i]) || (src[i] == '-') || (src[i] == '_') ||
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(src[i] == '.') || (src[i] == '~') )
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{
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buf[len++] = src[i];
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}
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else if( (len+3) <= blen )
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{
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buf[len++] = '%';
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buf[len++] = hex[(src[i] >> 4) & 15];
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buf[len++] = hex[(src[i] & 15) & 15];
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}
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else
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{
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break;
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}
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}
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return len;
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}
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int uh_b64decode(char *buf, int blen, const unsigned char *src, int slen)
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{
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int i = 0;
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int len = 0;
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unsigned int cin = 0;
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unsigned int cout = 0;
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for( i = 0; (i <= slen) && (src[i] != 0); i++ )
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{
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cin = src[i];
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if( (cin >= '0') && (cin <= '9') )
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cin = cin - '0' + 52;
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else if( (cin >= 'A') && (cin <= 'Z') )
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cin = cin - 'A';
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else if( (cin >= 'a') && (cin <= 'z') )
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cin = cin - 'a' + 26;
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else if( cin == '+' )
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cin = 62;
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else if( cin == '/' )
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cin = 63;
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else if( cin == '=' )
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cin = 0;
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else
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continue;
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cout = (cout << 6) | cin;
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if( (i % 4) == 3 )
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{
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if( (len + 3) < blen )
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{
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buf[len++] = (char)(cout >> 16);
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buf[len++] = (char)(cout >> 8);
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buf[len++] = (char)(cout);
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}
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else
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{
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break;
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}
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}
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}
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buf[len++] = 0;
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return len;
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}
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struct path_info * uh_path_lookup(struct client *cl, const char *url)
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{
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static char path_phys[PATH_MAX];
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static char path_info[PATH_MAX];
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static struct path_info p;
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char buffer[UH_LIMIT_MSGHEAD];
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char *docroot = cl->server->conf->docroot;
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char *pathptr = NULL;
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int i = 0;
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struct stat s;
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memset(path_phys, 0, sizeof(path_phys));
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memset(path_info, 0, sizeof(path_info));
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memset(buffer, 0, sizeof(buffer));
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memset(&p, 0, sizeof(p));
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/* copy docroot */
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memcpy(buffer, docroot,
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min(strlen(docroot), sizeof(buffer) - 1));
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/* separate query string from url */
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if( (pathptr = strchr(url, '?')) != NULL )
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{
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p.query = pathptr[1] ? pathptr + 1 : NULL;
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/* urldecode component w/o query */
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if( pathptr > url )
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uh_urldecode(
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&buffer[strlen(docroot)],
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sizeof(buffer) - strlen(docroot) - 1,
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url, (int)(pathptr - url) - 1
|
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);
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}
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/* no query string, decode all of url */
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else
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{
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uh_urldecode(
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&buffer[strlen(docroot)],
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sizeof(buffer) - strlen(docroot) - 1,
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url, strlen(url)
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);
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}
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/* create canon path */
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for( i = strlen(buffer); i >= 0; i-- )
|
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{
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if( (buffer[i] == 0) || (buffer[i] == '/') )
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{
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memset(path_info, 0, sizeof(path_info));
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memcpy(path_info, buffer, min(i + 1, sizeof(path_info) - 1));
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|
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if( realpath(path_info, path_phys) )
|
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{
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memset(path_info, 0, sizeof(path_info));
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memcpy(path_info, &buffer[i],
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min(strlen(buffer) - i, sizeof(path_info) - 1));
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break;
|
||||
}
|
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}
|
||||
}
|
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|
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/* check whether found path is within docroot */
|
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if( strncmp(path_phys, docroot, strlen(docroot)) ||
|
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((path_phys[strlen(docroot)] != 0) &&
|
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(path_phys[strlen(docroot)] != '/'))
|
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) {
|
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return NULL;
|
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}
|
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|
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/* test current path */
|
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if( ! stat(path_phys, &p.stat) )
|
||||
{
|
||||
/* is a regular file */
|
||||
if( p.stat.st_mode & S_IFREG )
|
||||
{
|
||||
p.root = docroot;
|
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p.phys = path_phys;
|
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p.name = &path_phys[strlen(docroot)];
|
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p.info = path_info[0] ? path_info : NULL;
|
||||
}
|
||||
|
||||
/* is a directory */
|
||||
else if( (p.stat.st_mode & S_IFDIR) && !strlen(path_info) )
|
||||
{
|
||||
/* ensure trailing slash */
|
||||
if( path_phys[strlen(path_phys)-1] != '/' )
|
||||
path_phys[strlen(path_phys)] = '/';
|
||||
|
||||
/* try to locate index file */
|
||||
memset(buffer, 0, sizeof(buffer));
|
||||
memcpy(buffer, path_phys, sizeof(buffer));
|
||||
pathptr = &buffer[strlen(buffer)];
|
||||
|
||||
for( i = 0; i < array_size(uh_index_files); i++ )
|
||||
{
|
||||
strncat(buffer, uh_index_files[i], sizeof(buffer));
|
||||
|
||||
if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
|
||||
{
|
||||
memcpy(path_phys, buffer, sizeof(path_phys));
|
||||
memcpy(&p.stat, &s, sizeof(p.stat));
|
||||
break;
|
||||
}
|
||||
|
||||
*pathptr = 0;
|
||||
}
|
||||
|
||||
p.root = docroot;
|
||||
p.phys = path_phys;
|
||||
p.name = &path_phys[strlen(docroot)];
|
||||
}
|
||||
}
|
||||
|
||||
return p.phys ? &p : NULL;
|
||||
}
|
||||
|
||||
|
||||
static char uh_realms[UH_LIMIT_AUTHREALMS * sizeof(struct auth_realm)] = { 0 };
|
||||
static int uh_realm_count = 0;
|
||||
|
||||
struct auth_realm * uh_auth_add(char *path, char *user, char *pass)
|
||||
{
|
||||
struct auth_realm *new = NULL;
|
||||
struct passwd *pwd;
|
||||
struct spwd *spwd;
|
||||
|
||||
if( uh_realm_count < UH_LIMIT_AUTHREALMS )
|
||||
{
|
||||
new = (struct auth_realm *)
|
||||
&uh_realms[uh_realm_count * sizeof(struct auth_realm)];
|
||||
|
||||
memset(new, 0, sizeof(struct auth_realm));
|
||||
|
||||
memcpy(new->path, path,
|
||||
min(strlen(path), sizeof(new->path) - 1));
|
||||
|
||||
memcpy(new->user, user,
|
||||
min(strlen(user), sizeof(new->user) - 1));
|
||||
|
||||
/* given password refers to a passwd entry */
|
||||
if( (strlen(pass) > 3) && !strncmp(pass, "$p$", 3) )
|
||||
{
|
||||
/* try to resolve shadow entry */
|
||||
if( ((spwd = getspnam(&pass[3])) != NULL) && spwd->sp_pwdp )
|
||||
{
|
||||
memcpy(new->pass, spwd->sp_pwdp,
|
||||
min(strlen(spwd->sp_pwdp), sizeof(new->pass) - 1));
|
||||
}
|
||||
|
||||
/* try to resolve passwd entry */
|
||||
else if( ((pwd = getpwnam(&pass[3])) != NULL) && pwd->pw_passwd &&
|
||||
(pwd->pw_passwd[0] != '!') && (pwd->pw_passwd[0] != 0)
|
||||
) {
|
||||
memcpy(new->pass, pwd->pw_passwd,
|
||||
min(strlen(pwd->pw_passwd), sizeof(new->pass) - 1));
|
||||
}
|
||||
}
|
||||
|
||||
/* ordinary pwd */
|
||||
else
|
||||
{
|
||||
memcpy(new->pass, pass,
|
||||
min(strlen(pass), sizeof(new->pass) - 1));
|
||||
}
|
||||
|
||||
uh_realm_count++;
|
||||
}
|
||||
|
||||
return new;
|
||||
}
|
||||
|
||||
int uh_auth_check(
|
||||
struct client *cl, struct http_request *req, struct path_info *pi
|
||||
) {
|
||||
int i, plen, rlen, protected;
|
||||
char buffer[UH_LIMIT_MSGHEAD];
|
||||
char *user = NULL;
|
||||
char *pass = NULL;
|
||||
|
||||
struct auth_realm *realm = NULL;
|
||||
|
||||
plen = strlen(pi->name);
|
||||
protected = 0;
|
||||
|
||||
/* check whether at least one realm covers the requested url */
|
||||
for( i = 0; i < uh_realm_count; i++ )
|
||||
{
|
||||
realm = (struct auth_realm *)
|
||||
&uh_realms[i * sizeof(struct auth_realm)];
|
||||
|
||||
rlen = strlen(realm->path);
|
||||
|
||||
if( (plen >= rlen) && !strncasecmp(pi->name, realm->path, rlen) )
|
||||
{
|
||||
req->realm = realm;
|
||||
protected = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* requested resource is covered by a realm */
|
||||
if( protected )
|
||||
{
|
||||
/* try to get client auth info */
|
||||
foreach_header(i, req->headers)
|
||||
{
|
||||
if( !strcasecmp(req->headers[i], "Authorization") &&
|
||||
(strlen(req->headers[i+1]) > 6) &&
|
||||
!strncasecmp(req->headers[i+1], "Basic ", 6)
|
||||
) {
|
||||
memset(buffer, 0, sizeof(buffer));
|
||||
uh_b64decode(buffer, sizeof(buffer) - 1,
|
||||
(unsigned char *) &req->headers[i+1][6],
|
||||
strlen(req->headers[i+1]) - 6);
|
||||
|
||||
if( (pass = strchr(buffer, ':')) != NULL )
|
||||
{
|
||||
user = buffer;
|
||||
*pass++ = 0;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* have client auth */
|
||||
if( user && pass )
|
||||
{
|
||||
/* find matching realm */
|
||||
for( i = 0, realm = NULL; i < uh_realm_count; i++ )
|
||||
{
|
||||
realm = (struct auth_realm *)
|
||||
&uh_realms[i * sizeof(struct auth_realm)];
|
||||
|
||||
rlen = strlen(realm->path);
|
||||
|
||||
if( (plen >= rlen) &&
|
||||
!strncasecmp(pi->name, realm->path, rlen) &&
|
||||
!strcmp(user, realm->user)
|
||||
) {
|
||||
req->realm = realm;
|
||||
break;
|
||||
}
|
||||
|
||||
realm = NULL;
|
||||
}
|
||||
|
||||
/* found a realm matching the username */
|
||||
if( realm )
|
||||
{
|
||||
/* is a crypt passwd */
|
||||
if( realm->pass[0] == '$' )
|
||||
pass = crypt(pass, realm->pass);
|
||||
|
||||
/* check user pass */
|
||||
if( !strcmp(pass, realm->pass) )
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* 401 */
|
||||
uh_http_sendf(cl, NULL,
|
||||
"HTTP/%.1f 401 Authorization Required\r\n"
|
||||
"WWW-Authenticate: Basic realm=\"%s\"\r\n"
|
||||
"Content-Type: text/plain\r\n"
|
||||
"Content-Length: 23\r\n\r\n"
|
||||
"Authorization Required\n",
|
||||
req->version, cl->server->conf->realm
|
||||
);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static char uh_listeners[UH_LIMIT_LISTENERS * sizeof(struct listener)] = { 0 };
|
||||
static char uh_clients[UH_LIMIT_CLIENTS * sizeof(struct client)] = { 0 };
|
||||
|
||||
static int uh_listener_count = 0;
|
||||
static int uh_client_count = 0;
|
||||
|
||||
|
||||
struct listener * uh_listener_add(int sock, struct config *conf)
|
||||
{
|
||||
struct listener *new = NULL;
|
||||
socklen_t sl;
|
||||
|
||||
if( uh_listener_count < UH_LIMIT_LISTENERS )
|
||||
{
|
||||
new = (struct listener *)
|
||||
&uh_listeners[uh_listener_count * sizeof(struct listener)];
|
||||
|
||||
new->socket = sock;
|
||||
new->conf = conf;
|
||||
|
||||
/* get local endpoint addr */
|
||||
sl = sizeof(struct sockaddr_in6);
|
||||
memset(&(new->addr), 0, sl);
|
||||
getsockname(sock, (struct sockaddr *) &(new->addr), &sl);
|
||||
|
||||
uh_listener_count++;
|
||||
}
|
||||
|
||||
return new;
|
||||
}
|
||||
|
||||
struct listener * uh_listener_lookup(int sock)
|
||||
{
|
||||
struct listener *cur = NULL;
|
||||
int i;
|
||||
|
||||
for( i = 0; i < uh_listener_count; i++ )
|
||||
{
|
||||
cur = (struct listener *) &uh_listeners[i * sizeof(struct listener)];
|
||||
|
||||
if( cur->socket == sock )
|
||||
return cur;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
||||
struct client * uh_client_add(int sock, struct listener *serv)
|
||||
{
|
||||
struct client *new = NULL;
|
||||
socklen_t sl;
|
||||
|
||||
if( uh_client_count < UH_LIMIT_CLIENTS )
|
||||
{
|
||||
new = (struct client *)
|
||||
&uh_clients[uh_client_count * sizeof(struct client)];
|
||||
|
||||
new->socket = sock;
|
||||
new->server = serv;
|
||||
|
||||
/* get remote endpoint addr */
|
||||
sl = sizeof(struct sockaddr_in6);
|
||||
memset(&(new->peeraddr), 0, sl);
|
||||
getpeername(sock, (struct sockaddr *) &(new->peeraddr), &sl);
|
||||
|
||||
/* get local endpoint addr */
|
||||
sl = sizeof(struct sockaddr_in6);
|
||||
memset(&(new->servaddr), 0, sl);
|
||||
getsockname(sock, (struct sockaddr *) &(new->servaddr), &sl);
|
||||
|
||||
uh_client_count++;
|
||||
}
|
||||
|
||||
return new;
|
||||
}
|
||||
|
||||
struct client * uh_client_lookup(int sock)
|
||||
{
|
||||
struct client *cur = NULL;
|
||||
int i;
|
||||
|
||||
for( i = 0; i < uh_client_count; i++ )
|
||||
{
|
||||
cur = (struct client *) &uh_clients[i * sizeof(struct client)];
|
||||
|
||||
if( cur->socket == sock )
|
||||
return cur;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void uh_client_remove(int sock)
|
||||
{
|
||||
struct client *del = uh_client_lookup(sock);
|
||||
|
||||
if( del )
|
||||
{
|
||||
memmove(del, del + 1,
|
||||
sizeof(uh_clients) - (int)((char *)del - uh_clients) - sizeof(struct client));
|
||||
|
||||
uh_client_count--;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user