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/* |
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* Hydra, an http server |
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* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
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* Some changes Copyright (C) 1996,97 Larry Doolittle <ldoolitt@boa.org> |
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* Some changes Copyright (C) 1997,99 Jon Nelson <jnelson@boa.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 1, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*/ |
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|
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/* $Id: read.c,v 1.6.2.1 2003/01/17 17:19:15 nmav Exp $*/ |
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|
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#include "boa.h" |
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#include "socket.h" |
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|
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/* |
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* Name: read_header |
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* Description: Reads data from a request socket. Manages the current |
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* status via a state machine. Changes status from READ_HEADER to |
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* READ_BODY or WRITE as necessary. |
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* |
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* Return values: |
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* -1: request blocked, move to blocked queue |
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* 0: request done, close it down |
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* 1: more to do, leave on ready list |
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*/ |
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|
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int |
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read_header(server_params *params, request *req) |
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{ |
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int bytes, |
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buf_bytes_left; |
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char *check, |
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*buffer; |
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|
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check = req->client_stream + req->parse_pos; |
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buffer = req->client_stream; |
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bytes = req->client_stream_pos; |
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|
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#ifdef VERY_FASCIST_LOGGING |
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if (check < (buffer + bytes)) { |
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buffer[bytes] = '\0'; |
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log_error_time(); |
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fprintf(stderr, "%s:%d - Parsing headers (\"%s\")\n", |
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__FILE__, __LINE__, check); |
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} |
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#endif |
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while (check < (buffer + bytes)) { |
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switch (req->status) { |
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case READ_HEADER: |
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if (*check == '\r') { |
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req->status = ONE_CR; |
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req->header_end = check; |
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} else if (*check == '\n') { |
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req->status = ONE_LF; |
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req->header_end = check; |
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} |
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break; |
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|
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case ONE_CR: |
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if (*check == '\n') |
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req->status = ONE_LF; |
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else if (*check != '\r') |
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req->status = READ_HEADER; |
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break; |
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|
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case ONE_LF: |
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/* if here, we've found the end (for sure) of a header */ |
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if (*check == '\r') /* could be end of headers */ |
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req->status = TWO_CR; |
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else if (*check == '\n') |
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req->status = BODY_READ; |
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else |
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req->status = READ_HEADER; |
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break; |
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|
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case TWO_CR: |
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if (*check == '\n') |
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req->status = BODY_READ; |
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else if (*check != '\r') |
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req->status = READ_HEADER; |
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break; |
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|
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default: |
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break; |
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} |
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|
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#ifdef VERY_FASCIST_LOGGING |
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log_error_time(); |
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fprintf(stderr, "status, check: %d, %d\n", req->status, *check); |
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#endif |
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|
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req->parse_pos++; /* update parse position */ |
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check++; |
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|
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if (req->status == ONE_LF) { |
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*req->header_end = '\0'; |
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|
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/* terminate string that begins at req->header_line */ |
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|
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if (req->logline) { |
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if (process_option_line(req) == 0) { |
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return 0; |
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} |
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} else { |
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if (process_logline(req) == 0) |
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return 0; |
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if (req->http_version == HTTP_0_9) |
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return process_header_end(params, req); |
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} |
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/* set header_line to point to beginning of new header */ |
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req->header_line = check; |
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} else if (req->status == BODY_READ) { |
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#ifdef VERY_FASCIST_LOGGING |
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int retval; |
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log_error_time(); |
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fprintf(stderr, "%s:%d -- got to body read.\n", |
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__FILE__, __LINE__); |
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retval = process_header_end(params, req); |
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#else |
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int retval = process_header_end(params, req); |
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#endif |
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/* process_header_end inits non-POST cgi's */ |
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|
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if (retval && req->method == M_POST) { |
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/* for body_{read,write}, set header_line to start of data, |
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and header_end to end of data */ |
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req->header_line = check; |
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req->header_end = req->client_stream + req->client_stream_pos; |
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|
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req->status = BODY_WRITE; |
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/* so write it */ |
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/* have to write first, or read will be confused |
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* because of the special case where the |
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* filesize is less than we have already read. |
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*/ |
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|
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/* |
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|
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As quoted from RFC1945: |
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|
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A valid Content-Length is required on all HTTP/1.0 POST requests. An |
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HTTP/1.0 server should respond with a 400 (bad request) message if it |
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cannot determine the length of the request message's content. |
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|
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*/ |
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|
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if (req->content_length) { |
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int content_length; |
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|
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content_length = boa_atoi(req->content_length); |
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/* Is a content-length of 0 legal? */ |
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if (content_length < 0) { |
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log_error_time(); |
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fprintf(stderr, |
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"Invalid Content-Length [%s] on POST!\n", |
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req->content_length); |
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send_r_bad_request(req); |
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return 0; |
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} |
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if (single_post_limit && content_length > single_post_limit) { |
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log_error_time(); |
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fprintf(stderr, |
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"Content-Length [%d] > SinglePostLimit [%d] on POST!\n", |
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content_length, single_post_limit); |
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send_r_bad_request(req); |
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return 0; |
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} |
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req->filesize = content_length; |
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req->filepos = 0; |
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if (req->header_end - req->header_line > req->filesize) { |
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req->header_end = req->header_line + req->filesize; |
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} |
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} else { |
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log_error_time(); |
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fprintf(stderr, "Unknown Content-Length POST!\n"); |
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send_r_bad_request(req); |
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return 0; |
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} |
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} /* either process_header_end failed or req->method != POST */ |
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return retval; /* 0 - close it done, 1 - keep on ready */ |
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} /* req->status == BODY_READ */ |
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} /* done processing available buffer */ |
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|
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#ifdef VERY_FASCIST_LOGGING |
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log_error_time(); |
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fprintf(stderr, "%s:%d - Done processing buffer. Status: %d\n", |
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__FILE__, __LINE__, req->status); |
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#endif |
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|
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if (req->status < BODY_READ) { |
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/* only reached if request is split across more than one packet */ |
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|
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buf_bytes_left = CLIENT_STREAM_SIZE - req->client_stream_pos; |
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if (buf_bytes_left < 1) { |
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log_error_time(); |
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fputs("buffer overrun - read.c, read_header - closing\n", stderr); |
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req->status = DEAD; |
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return 0; |
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} |
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|
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bytes = socket_recv(req, buffer + req->client_stream_pos, |
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buf_bytes_left); |
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|
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if (bytes < 0) { |
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if (bytes == BOA_E_INTR) |
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return 1; |
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if (bytes == BOA_E_AGAIN) |
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return -1; |
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|
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log_error_doc(req); |
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perror("header read"); /* don't need to save errno because log_error_doc does */ |
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return 0; |
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} else if (bytes == 0) { |
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/* this is an error. premature end of headers! */ |
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return 0; |
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} |
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|
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/* bytes is positive */ |
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req->client_stream_pos += bytes; |
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|
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#ifdef FASCIST_LOGGING1 |
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log_error_time(); |
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req->client_stream[req->client_stream_pos] = '\0'; |
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fprintf(stderr, "%s:%d -- We read %d bytes: \"%s\"\n", |
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__FILE__, __LINE__, bytes, |
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#ifdef VERY_FASCIST_LOGGING2 |
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req->client_stream + req->client_stream_pos - bytes); |
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#else |
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""); |
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#endif |
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#endif |
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} |
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return 1; |
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} /* read_header() */ |
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|
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/* |
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* Name: read_body |
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* Description: Reads body from a request socket for POST CGI |
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* |
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* Return values: |
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* |
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* -1: request blocked, move to blocked queue |
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* 0: request done, close it down |
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* 1: more to do, leave on ready list |
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* |
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|
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As quoted from RFC1945: |
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|
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A valid Content-Length is required on all HTTP/1.0 POST requests. An |
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HTTP/1.0 server should respond with a 400 (bad request) message if it |
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cannot determine the length of the request message's content. |
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|
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*/ |
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|
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int |
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read_body(request *req) |
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{ |
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int bytes_read, bytes_to_read, bytes_free; |
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|
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bytes_free = BUFFER_SIZE - (req->header_end - req->header_line); |
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bytes_to_read = req->filesize - req->filepos; |
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|
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if (bytes_to_read > bytes_free) |
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bytes_to_read = bytes_free; |
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|
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if (bytes_to_read <= 0) { |
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req->status = BODY_WRITE; /* go write it */ |
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return 1; |
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} |
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|
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bytes_read = socket_recv(req, req->header_end, bytes_to_read); |
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|
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if (bytes_read < 0) { |
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if (bytes_read == BOA_E_AGAIN) { |
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return -1; |
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} else { |
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boa_perror(req, "read body"); |
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return 0; |
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} |
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|
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} else if (bytes_read == 0) { |
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/* this is an error. premature end of body! */ |
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log_error_time(); |
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fprintf(stderr, "%s:%d - Premature end of body!!\n", |
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__FILE__, __LINE__); |
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send_r_bad_request(req); |
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return 0; |
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} |
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|
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req->status = BODY_WRITE; |
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|
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#ifdef FASCIST_LOGGING1 |
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log_error_time(); |
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fprintf(stderr, "%s:%d - read %d bytes.\n", |
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__FILE__, __LINE__, bytes_to_read); |
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#endif |
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|
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req->header_end += bytes_read; |
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|
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return 1; |
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} |
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|
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/* |
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* Name: write_body |
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* Description: Writes a chunk of data to a file |
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* |
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* Return values: |
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* -1: request blocked, move to blocked queue |
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* 0: EOF or error, close it down |
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* 1: successful write, recycle in ready queue |
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*/ |
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|
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int write_body(request * req) |
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{ |
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int bytes_written, bytes_to_write = req->header_end - req->header_line; |
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if (req->filepos + bytes_to_write > req->filesize) |
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bytes_to_write = req->filesize - req->filepos; |
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|
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if (bytes_to_write == 0) { /* nothing left in buffer to write */ |
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req->header_line = req->header_end = req->buffer; |
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if (req->filepos >= req->filesize) |
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return init_cgi(req); |
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/* if here, we can safely assume that there is more to read */ |
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req->status = BODY_READ; |
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return 1; |
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} |
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bytes_written = |
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write(req->post_data_fd.fds[1], req->header_line, bytes_to_write); |
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|
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if (bytes_written == -1) { |
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if (errno == EWOULDBLOCK || errno == EAGAIN) |
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return -1; /* request blocked at the pipe level, but keep going */ |
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else if (errno == EINTR) |
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return 1; |
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else if (errno == ENOSPC) { |
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/* 20010520 - Alfred Fluckiger */ |
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/* No test was originally done in this case, which might */ |
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/* lead to a "no space left on device" error. */ |
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boa_perror(req, "write body"); /* OK to disable if your logs get too big */ |
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return 0; |
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} else { |
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boa_perror(req, "write body"); /* OK to disable if your logs get too big */ |
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return 0; |
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} |
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} |
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#ifdef FASCIST_LOGGING |
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log_error_time(); |
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fprintf(stderr, "%s:%d - wrote %d bytes. %ld of %ld\n", |
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__FILE__, __LINE__, bytes_written, req->filepos, req->filesize); |
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#endif |
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|
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req->filepos += bytes_written; |
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req->header_line += bytes_written; |
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|
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return 1; /* more to do */ |
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} |