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557 lines
13 KiB
C
557 lines
13 KiB
C
/*
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* uhttpd - Tiny single-threaded httpd - CGI handler
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*
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* Copyright (C) 2010-2012 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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#include "uhttpd.h"
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#include "uhttpd-utils.h"
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#include "uhttpd-cgi.h"
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static bool
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uh_cgi_header_parse(struct http_response *res, char *buf, int len, int *off)
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{
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char *bufptr = NULL;
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char *hdrname = NULL;
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int hdrcount = 0;
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int pos = 0;
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if (((bufptr = strfind(buf, len, "\r\n\r\n", 4)) != NULL) ||
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((bufptr = strfind(buf, len, "\n\n", 2)) != NULL))
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{
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*off = (int)(bufptr - buf) + ((bufptr[0] == '\r') ? 4 : 2);
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memset(res, 0, sizeof(*res));
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res->statuscode = 200;
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res->statusmsg = "OK";
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bufptr = &buf[0];
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for (pos = 0; pos < *off; pos++)
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{
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if (!hdrname && (buf[pos] == ':'))
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{
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buf[pos++] = 0;
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if ((pos < len) && (buf[pos] == ' '))
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pos++;
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if (pos < len)
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{
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hdrname = bufptr;
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bufptr = &buf[pos];
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}
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}
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else if ((buf[pos] == '\r') || (buf[pos] == '\n'))
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{
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if (! hdrname)
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break;
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buf[pos++] = 0;
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if ((pos < len) && (buf[pos] == '\n'))
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pos++;
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if (pos <= len)
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{
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if ((hdrcount+1) < array_size(res->headers))
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{
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if (!strcasecmp(hdrname, "Status"))
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{
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res->statuscode = atoi(bufptr);
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if (res->statuscode < 100)
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res->statuscode = 200;
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if (((bufptr = strchr(bufptr, ' ')) != NULL) &&
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(&bufptr[1] != 0))
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{
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res->statusmsg = &bufptr[1];
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}
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D("CGI: HTTP/1.x %03d %s\n",
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res->statuscode, res->statusmsg);
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}
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else
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{
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D("CGI: HTTP: %s: %s\n", hdrname, bufptr);
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res->headers[hdrcount++] = hdrname;
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res->headers[hdrcount++] = bufptr;
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}
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bufptr = &buf[pos];
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hdrname = NULL;
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}
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else
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{
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return false;
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}
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}
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}
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}
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return true;
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}
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return false;
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}
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static char * uh_cgi_header_lookup(struct http_response *res,
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const char *hdrname)
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{
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int i;
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foreach_header(i, res->headers)
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{
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if (!strcasecmp(res->headers[i], hdrname))
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return res->headers[i+1];
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}
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return NULL;
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}
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static void uh_cgi_shutdown(struct uh_cgi_state *state)
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{
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free(state);
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}
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static bool uh_cgi_socket_cb(struct client *cl)
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{
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int i, len, blen, hdroff;
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char buf[UH_LIMIT_MSGHEAD];
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struct uh_cgi_state *state = (struct uh_cgi_state *)cl->priv;
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struct http_response *res = &cl->response;
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struct http_request *req = &cl->request;
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/* there is unread post data waiting */
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while (state->content_length > 0)
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{
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/* remaining data in http head buffer ... */
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if (cl->httpbuf.len > 0)
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{
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len = min(state->content_length, cl->httpbuf.len);
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D("CGI: Child(%d) feed %d HTTP buffer bytes\n", cl->proc.pid, len);
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memcpy(buf, cl->httpbuf.ptr, len);
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cl->httpbuf.len -= len;
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cl->httpbuf.ptr +=len;
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}
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/* read it from socket ... */
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else
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{
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len = uh_tcp_recv(cl, buf,
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min(state->content_length, sizeof(buf)));
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if ((len < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK)))
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break;
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D("CGI: Child(%d) feed %d/%d TCP socket bytes\n",
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cl->proc.pid, len, min(state->content_length, sizeof(buf)));
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}
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if (len)
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state->content_length -= len;
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else
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state->content_length = 0;
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/* ... write to CGI process */
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len = uh_raw_send(cl->wpipe.fd, buf, len,
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cl->server->conf->script_timeout);
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/* explicit EOF notification for the child */
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if (state->content_length <= 0)
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uh_ufd_remove(&cl->wpipe);
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}
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/* try to read data from child */
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while ((len = uh_raw_recv(cl->rpipe.fd, buf, state->header_sent
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? sizeof(buf) : state->httpbuf.len, -1)) > 0)
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{
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/* we have not pushed out headers yet, parse input */
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if (!state->header_sent)
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{
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/* try to parse header ... */
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memcpy(state->httpbuf.ptr, buf, len);
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state->httpbuf.len -= len;
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state->httpbuf.ptr += len;
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blen = state->httpbuf.ptr - state->httpbuf.buf;
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if (uh_cgi_header_parse(res, state->httpbuf.buf, blen, &hdroff))
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{
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/* write status */
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ensure_out(uh_http_sendf(cl, NULL,
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"%s %03d %s\r\n"
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"Connection: close\r\n",
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http_versions[req->version],
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res->statuscode, res->statusmsg));
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/* add Content-Type if no Location or Content-Type */
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if (!uh_cgi_header_lookup(res, "Location") &&
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!uh_cgi_header_lookup(res, "Content-Type"))
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{
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ensure_out(uh_http_send(cl, NULL,
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"Content-Type: text/plain\r\n", -1));
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}
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/* if request was HTTP 1.1 we'll respond chunked */
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if ((req->version > UH_HTTP_VER_1_0) &&
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!uh_cgi_header_lookup(res, "Transfer-Encoding"))
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{
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ensure_out(uh_http_send(cl, NULL,
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"Transfer-Encoding: chunked\r\n", -1));
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}
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/* write headers from CGI program */
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foreach_header(i, res->headers)
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{
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ensure_out(uh_http_sendf(cl, NULL, "%s: %s\r\n",
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res->headers[i], res->headers[i+1]));
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}
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/* terminate header */
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ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
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state->header_sent = true;
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/* push out remaining head buffer */
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if (hdroff < blen)
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{
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D("CGI: Child(%d) relaying %d rest bytes\n",
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cl->proc.pid, blen - hdroff);
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ensure_out(uh_http_send(cl, req,
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state->httpbuf.buf + hdroff,
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blen - hdroff));
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}
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}
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/* ... failed and head buffer exceeded */
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else if (!state->httpbuf.len)
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{
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/* I would do this ...
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*
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* uh_cgi_error_500(cl, req,
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* "The CGI program generated an "
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* "invalid response:\n\n");
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*
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* ... but in order to stay as compatible as possible,
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* treat whatever we got as text/plain response and
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* build the required headers here.
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*/
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ensure_out(uh_http_sendf(cl, NULL,
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"%s 200 OK\r\n"
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"Content-Type: text/plain\r\n"
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"%s\r\n",
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http_versions[req->version],
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(req->version > UH_HTTP_VER_1_0)
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? "Transfer-Encoding: chunked\r\n" : ""
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));
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state->header_sent = true;
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D("CGI: Child(%d) relaying %d invalid bytes\n",
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cl->proc.pid, len);
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ensure_out(uh_http_send(cl, req, buf, len));
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}
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}
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else
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{
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/* headers complete, pass through buffer to socket */
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D("CGI: Child(%d) relaying %d normal bytes\n", cl->proc.pid, len);
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ensure_out(uh_http_send(cl, req, buf, len));
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}
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}
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/* got EOF or read error from child */
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if ((len == 0) ||
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((errno != EAGAIN) && (errno != EWOULDBLOCK) && (len == -1)))
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{
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D("CGI: Child(%d) presumed dead [%s]\n", cl->proc.pid, strerror(errno));
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goto out;
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}
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return true;
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out:
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if (!state->header_sent)
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{
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if (cl->timeout.pending)
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uh_http_sendhf(cl, 502, "Bad Gateway",
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"The CGI process did not produce any response\n");
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else
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uh_http_sendhf(cl, 504, "Gateway Timeout",
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"The CGI process took too long to produce a "
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"response\n");
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}
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else
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{
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uh_http_send(cl, req, "", 0);
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}
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uh_cgi_shutdown(state);
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return false;
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}
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bool uh_cgi_request(struct client *cl, struct path_info *pi,
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struct interpreter *ip)
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{
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int i;
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int rfd[2] = { 0, 0 };
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int wfd[2] = { 0, 0 };
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pid_t child;
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struct uh_cgi_state *state;
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struct http_request *req = &cl->request;
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/* allocate state */
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if (!(state = malloc(sizeof(*state))))
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{
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uh_http_sendhf(cl, 500, "Internal Server Error", "Out of memory");
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return false;
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}
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/* spawn pipes for me->child, child->me */
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if ((pipe(rfd) < 0) || (pipe(wfd) < 0))
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{
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if (rfd[0] > 0) close(rfd[0]);
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if (rfd[1] > 0) close(rfd[1]);
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if (wfd[0] > 0) close(wfd[0]);
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if (wfd[1] > 0) close(wfd[1]);
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"Failed to create pipe: %s\n", strerror(errno));
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return false;
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}
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/* fork off child process */
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switch ((child = fork()))
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{
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/* oops */
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case -1:
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"Failed to fork child: %s\n", strerror(errno));
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return false;
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/* exec child */
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case 0:
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#ifdef DEBUG
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sleep(atoi(getenv("UHTTPD_SLEEP_ON_FORK") ?: "0"));
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#endif
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/* do not leak parent epoll descriptor */
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uloop_done();
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/* close loose pipe ends */
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close(rfd[0]);
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close(wfd[1]);
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/* patch stdout and stdin to pipes */
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dup2(rfd[1], 1);
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dup2(wfd[0], 0);
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/* avoid leaking our pipe into child-child processes */
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fd_cloexec(rfd[1]);
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fd_cloexec(wfd[0]);
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/* check for regular, world-executable file _or_ interpreter */
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if (((pi->stat.st_mode & S_IFREG) &&
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(pi->stat.st_mode & S_IXOTH)) || (ip != NULL))
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{
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/* build environment */
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clearenv();
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/* common information */
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setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
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setenv("SERVER_SOFTWARE", "uHTTPd", 1);
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setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
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#ifdef HAVE_TLS
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/* https? */
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if (cl->tls)
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setenv("HTTPS", "on", 1);
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#endif
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/* addresses */
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setenv("SERVER_NAME", sa_straddr(&cl->servaddr), 1);
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setenv("SERVER_ADDR", sa_straddr(&cl->servaddr), 1);
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setenv("SERVER_PORT", sa_strport(&cl->servaddr), 1);
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setenv("REMOTE_HOST", sa_straddr(&cl->peeraddr), 1);
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setenv("REMOTE_ADDR", sa_straddr(&cl->peeraddr), 1);
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setenv("REMOTE_PORT", sa_strport(&cl->peeraddr), 1);
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/* path information */
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setenv("SCRIPT_NAME", pi->name, 1);
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setenv("SCRIPT_FILENAME", pi->phys, 1);
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setenv("DOCUMENT_ROOT", pi->root, 1);
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setenv("QUERY_STRING", pi->query ? pi->query : "", 1);
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if (pi->info)
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setenv("PATH_INFO", pi->info, 1);
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/* REDIRECT_STATUS, php-cgi wants it */
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switch (req->redirect_status)
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{
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case 404:
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setenv("REDIRECT_STATUS", "404", 1);
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break;
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default:
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setenv("REDIRECT_STATUS", "200", 1);
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break;
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}
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/* http version */
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setenv("SERVER_PROTOCOL", http_versions[req->version], 1);
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/* request method */
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setenv("REQUEST_METHOD", http_methods[req->method], 1);
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/* request url */
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setenv("REQUEST_URI", req->url, 1);
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/* remote user */
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if (req->realm)
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setenv("REMOTE_USER", req->realm->user, 1);
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/* request message headers */
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foreach_header(i, req->headers)
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{
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if (!strcasecmp(req->headers[i], "Accept"))
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setenv("HTTP_ACCEPT", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Accept-Charset"))
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setenv("HTTP_ACCEPT_CHARSET", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Accept-Encoding"))
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setenv("HTTP_ACCEPT_ENCODING", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Accept-Language"))
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setenv("HTTP_ACCEPT_LANGUAGE", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Authorization"))
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setenv("HTTP_AUTHORIZATION", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Connection"))
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setenv("HTTP_CONNECTION", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Cookie"))
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setenv("HTTP_COOKIE", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Host"))
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setenv("HTTP_HOST", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Referer"))
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setenv("HTTP_REFERER", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "User-Agent"))
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setenv("HTTP_USER_AGENT", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Content-Type"))
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setenv("CONTENT_TYPE", req->headers[i+1], 1);
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else if (!strcasecmp(req->headers[i], "Content-Length"))
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setenv("CONTENT_LENGTH", req->headers[i+1], 1);
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}
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/* execute child code ... */
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if (chdir(pi->root))
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perror("chdir()");
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if (ip != NULL)
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execl(ip->path, ip->path, pi->phys, NULL);
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else
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execl(pi->phys, pi->phys, NULL);
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/* in case it fails ... */
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printf("Status: 500 Internal Server Error\r\n\r\n"
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"Unable to launch the requested CGI program:\n"
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" %s: %s\n", ip ? ip->path : pi->phys, strerror(errno));
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}
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/* 403 */
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else
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{
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printf("Status: 403 Forbidden\r\n\r\n"
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"Access to this resource is forbidden\n");
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}
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close(wfd[0]);
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close(rfd[1]);
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exit(0);
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break;
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/* parent; handle I/O relaying */
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default:
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memset(state, 0, sizeof(*state));
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cl->rpipe.fd = rfd[0];
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cl->wpipe.fd = wfd[1];
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cl->proc.pid = child;
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/* make pipe non-blocking */
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fd_nonblock(cl->rpipe.fd);
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fd_nonblock(cl->wpipe.fd);
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/* close unneeded pipe ends */
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close(rfd[1]);
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close(wfd[0]);
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D("CGI: Child(%d) created: rfd(%d) wfd(%d)\n", child, rfd[0], wfd[1]);
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state->httpbuf.ptr = state->httpbuf.buf;
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state->httpbuf.len = sizeof(state->httpbuf.buf);
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state->content_length = cl->httpbuf.len;
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/* find content length */
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if (req->method == UH_HTTP_MSG_POST)
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{
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foreach_header(i, req->headers)
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{
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if (!strcasecmp(req->headers[i], "Content-Length"))
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{
|
|
state->content_length = atoi(req->headers[i+1]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
cl->cb = uh_cgi_socket_cb;
|
|
cl->priv = state;
|
|
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|