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nmav |
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/* |
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* Boa, an http server |
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* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
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* Some changes Copyright (C) 1999 Jon Nelson <jnelson@boa.org> |
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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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/* $Id: buffer.c,v 1.10.2.2 2002/07/26 03:03:44 jnelson Exp $ */ |
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#include "boa.h" |
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#include "escape.h" |
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#include "socket.h" |
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extern int boa_ssl; |
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#define INT_TO_HEX(x) \ |
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((((x)-10)>=0)?('A'+((x)-10)):('0'+(x))) |
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/* |
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* Name: req_write |
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* |
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* Description: Buffers data before sending to client. |
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* Returns: -1 for error, otherwise how much is stored |
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*/ |
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int req_write(request * req, char *msg) |
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{ |
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int msg_len; |
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msg_len = strlen(msg); |
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if (!msg_len || req->status == DEAD) |
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return req->buffer_end; |
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if (req->buffer_end + msg_len > BUFFER_SIZE) { |
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log_error_time(); |
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fprintf(stderr, "Ran out of Buffer space!\n"); |
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req->status = DEAD; |
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return -1; |
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} |
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memcpy(req->buffer + req->buffer_end, msg, msg_len); |
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req->buffer_end += msg_len; |
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return req->buffer_end; |
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} |
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void reset_output_buffer(request *req) |
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{ |
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req->buffer_end = 0; |
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} |
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/* |
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* Name: req_write_escape_http |
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* Description: Buffers and "escapes" data before sending to client. |
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* as above, but translates as it copies, into a form suitably |
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* encoded for URLs in HTTP headers. |
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* Returns: -1 for error, otherwise how much is stored |
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*/ |
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int req_write_escape_http(request * req, char *msg) |
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{ |
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char c, *inp, *dest; |
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int left; |
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inp = msg; |
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dest = req->buffer + req->buffer_end; |
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/* 3 is a guard band, since we don't check the destination pointer |
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* in the middle of a transfer of up to 3 bytes */ |
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left = BUFFER_SIZE - req->buffer_end - 3; |
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while ((c = *inp++) && left > 0) { |
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if (needs_escape((unsigned int) c)) { |
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*dest++ = '%'; |
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*dest++ = INT_TO_HEX(c >> 4); |
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*dest++ = INT_TO_HEX(c & 15); |
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left -= 3; |
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} else { |
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*dest++ = c; |
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left--; |
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} |
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} |
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req->buffer_end = dest - req->buffer; |
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if (left == 0) { |
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log_error_time(); |
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fprintf(stderr, "Ran out of Buffer space!\n"); |
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req->status = DEAD; |
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return -1; |
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} |
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return req->buffer_end; |
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} |
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/* |
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* Name: req_write_escape_html |
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* Description: Buffers and "escapes" data before sending to client. |
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* as above, but translates as it copies, into a form suitably |
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* encoded for HTML bodies. |
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* Returns: -1 for error, otherwise how much is stored |
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*/ |
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int req_write_escape_html(request * req, char *msg) |
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{ |
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char c, *inp, *dest; |
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int left; |
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inp = msg; |
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dest = req->buffer + req->buffer_end; |
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/* 5 is a guard band, since we don't check the destination pointer |
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* in the middle of a transfer of up to 5 bytes */ |
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left = BUFFER_SIZE - req->buffer_end - 5; |
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while ((c = *inp++) && left > 0) { |
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switch (c) { |
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case '>': |
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*dest++ = '&'; |
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*dest++ = 'g'; |
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*dest++ = 't'; |
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*dest++ = ';'; |
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left -= 4; |
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break; |
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case '<': |
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*dest++ = '&'; |
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*dest++ = 'l'; |
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*dest++ = 't'; |
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*dest++ = ';'; |
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left -= 4; |
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break; |
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case '&': |
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*dest++ = '&'; |
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*dest++ = 'a'; |
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*dest++ = 'm'; |
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*dest++ = 'p'; |
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*dest++ = ';'; |
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left -= 5; |
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break; |
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case '\"': |
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*dest++ = '&'; |
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*dest++ = 'q'; |
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*dest++ = 'u'; |
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*dest++ = 'o'; |
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*dest++ = 't'; |
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*dest++ = ';'; |
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left -= 6; |
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break; |
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default: |
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*dest++ = c; |
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left--; |
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} |
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} |
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req->buffer_end = dest - req->buffer; |
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if (left == 0) { |
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log_error_time(); |
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fprintf(stderr, "Ran out of Buffer space!\n"); |
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req->status = DEAD; |
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return -1; |
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} |
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return req->buffer_end; |
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} |
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/* |
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* Name: flush_req |
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* |
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* Description: Sends any backlogged buffer to client. |
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* |
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* Returns: -2 for error, -1 for blocked, otherwise how much is stored |
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*/ |
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int req_flush(request * req) |
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{ |
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int bytes_to_write; |
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bytes_to_write = req->buffer_end - req->buffer_start; |
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if (req->status == DEAD) |
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return -2; |
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if (bytes_to_write) { |
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int bytes_written; |
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bytes_written = socket_send(req, req->buffer + req->buffer_start, bytes_to_write); |
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if (bytes_written < 0) { |
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if (bytes_written == BOA_E_AGAIN) |
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return -1; /* request blocked at the pipe level, but keep going */ |
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else { |
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req->buffer_start = req->buffer_end = 0; |
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if (bytes_written == BOA_E_PIPE) |
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perror("buffer flush"); /* OK to disable if your logs get too big */ |
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req->status = DEAD; |
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req->buffer_end = 0; |
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return -2; |
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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 \"", __FILE__, __LINE__); |
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fwrite(req->buffer + req->buffer_start, sizeof (char), |
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bytes_written, stderr); |
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fprintf(stderr, "\" (%d bytes)\n", bytes_written); |
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#endif |
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req->buffer_start += bytes_written; |
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} |
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if (req->buffer_start == req->buffer_end) |
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req->buffer_start = req->buffer_end = 0; |
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return req->buffer_end; /* successful */ |
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} |
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/* |
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* Name: escape_string |
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* |
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* Description: escapes the string inp. Uses variable buf. If buf is |
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* NULL when the program starts, it will attempt to dynamically allocate |
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* the space that it needs, otherwise it will assume that the user |
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* has already allocated enough space for the variable buf, which |
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* could be up to 3 times the size of inp. If the routine dynamically |
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* allocates the space, the user is responsible for freeing it afterwords |
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* Returns: NULL on error, pointer to string otherwise. |
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* Note: this function doesn't really belong here, I plopped it here to |
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* work around a "bug" in escape.h (it defines a global, so can't be |
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* used in multiple source files). Actually, this routine shouldn't |
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* exist anywhere, it's only usage is in get.c's handling of on-the-fly |
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* directory generation, which would be better configured to use a combination |
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* of req_write_escape_http and req_write_escape_html. That would involve |
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* more work than I'm willing to put in right now, though, so here we are. |
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*/ |
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char *escape_string(char *inp, char *buf) |
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{ |
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int max; |
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char *index; |
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unsigned char c; |
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max = strlen(inp) * 3; |
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if (buf == NULL && max) |
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buf = malloc(sizeof (char) * max + 1); |
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if (buf == NULL) { |
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log_error_time(); |
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perror("malloc"); |
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return NULL; |
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} |
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index = buf; |
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while ((c = *inp++) && max > 0) { |
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if (needs_escape((unsigned int) c)) { |
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*index++ = '%'; |
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*index++ = INT_TO_HEX(c >> 4); |
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*index++ = INT_TO_HEX(c & 15); |
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} else |
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*index++ = c; |
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} |
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*index = '\0'; |
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return buf; |
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} |