249d4b7f33
The notices have been changed to a more GNU look. Documentation comments have been separated from the copyright header. I've tried to keep all copyright notices intact. Some author contact details have been updated.
272 lines
7.9 KiB
C
272 lines
7.9 KiB
C
/* tinyproxy - A fast light-weight HTTP proxy
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* Copyright (C) 2003 Robert James Kaes <rjkaes@users.sourceforge.net>
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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 2 of the License, or
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* (at your option) 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* See 'http-message.h' for detailed information. */
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#include "common.h"
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#include "heap.h"
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#include "http-message.h"
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#include "network.h"
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/*
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* Package up an HTTP message into a nice little structure. As you can
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* see this structure doesn't actually store any allocated strings;
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* therefore, the caller must free any memory referenced by this struct.
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* Also, the caller MUST NOT free the memory while the structure is
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* still in use---bad things would happen.
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*/
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struct http_message_s {
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/* Response string and code supplied on the HTTP status line */
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struct {
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const char *string;
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int code;
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} response;
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/*
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* A group of headers to be sent with this message. Right now
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* the strings are referenced through pointers in an array.
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* I might change this to a vector in the future.
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*/
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struct {
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char **strings;
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unsigned int total;
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unsigned int used;
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} headers;
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/* Body of the message (most likely an HTML message) */
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struct {
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const char *text;
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size_t length;
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} body;
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};
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/*
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* Check if the HTTP message is validly formed. This is the one odd-ball
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* function. It returns 0 if the message is invalid; otherwise, a positive
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* number is returned. Useful for if() tests and assert() tests.
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*/
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static int
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is_http_message_valid(http_message_t msg)
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{
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if (msg == NULL)
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return 0;
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if (msg->headers.strings == NULL)
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return 0;
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if (msg->response.string == NULL)
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return 0;
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if (msg->response.code < 1 || msg->response.code > 999)
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return 0;
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return 1;
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}
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/* Initially allocate space for 128 headers */
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#define NUMBER_OF_HEADERS 128
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/*
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* Allocate a new http_message structure on the heap.
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* If memory could not be allocated, return a NULL.
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*/
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http_message_t
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http_message_create(int response_code, const char *response_string)
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{
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http_message_t msg;
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int ret;
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msg = safecalloc(1, sizeof(struct http_message_s));
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if (msg == NULL)
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return NULL;
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msg->headers.strings = safecalloc(NUMBER_OF_HEADERS, sizeof(char *));
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if (msg->headers.strings == NULL) {
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safefree(msg);
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return NULL;
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}
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msg->headers.total = NUMBER_OF_HEADERS;
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/* Store the HTTP response information in the structure */
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ret = http_message_set_response(msg, response_code, response_string);
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if (IS_HTTP_MSG_ERROR(ret)) {
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safefree(msg->headers.strings);
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safefree(msg);
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return NULL;
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}
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return msg;
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}
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/*
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* Free up the space associated with this HTTP message structure.
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* This DOES NOT free the pointers stored in this structure. That memory
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* is the responsibility of the caller.
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*/
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int
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http_message_destroy(http_message_t msg)
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{
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assert(msg != NULL);
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assert(msg->headers.strings != NULL);
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/* Check for valid arguments */
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if (msg == NULL)
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return -EFAULT;
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if (msg->headers.strings != NULL)
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safefree(msg->headers.strings);
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safefree(msg);
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return 0;
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}
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/*
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* Set the HTTP response information for this structure. The response_string
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* must be a NUL ('\0') terminated C string.
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*/
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int
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http_message_set_response(http_message_t msg,
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int response_code, const char *response_string)
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{
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/* Check for valid arguments */
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if (msg == NULL)
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return -EFAULT;
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if (response_code < 1 || response_code > 999)
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return -EINVAL;
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if (response_string == NULL)
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return -EINVAL;
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if (strlen(response_string) == 0)
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return -EINVAL;
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msg->response.code = response_code;
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msg->response.string = response_string;
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return 0;
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}
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/*
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* Set the HTTP message body.
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*/
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int
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http_message_set_body(http_message_t msg, const char *body, size_t len)
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{
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/* Check for valid arguments */
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if (msg == NULL)
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return -EFAULT;
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if (body == NULL)
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return -EINVAL;
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if (len == 0)
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return -EINVAL;
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msg->body.text = body;
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msg->body.length = len;
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return 0;
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}
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/*
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* Add headers to the structure.
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*/
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int
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http_message_add_headers(http_message_t msg, char **headers, int num_headers)
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{
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char **new_headers;
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int i;
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/* Check for valid arguments */
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if (msg == NULL)
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return -EFAULT;
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if (headers == NULL)
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return -EINVAL;
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if (num_headers < 1)
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return -EINVAL;
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/*
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* If the number of headers to add is greater than the space
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* available, reallocate the memory.
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*/
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if (msg->headers.used + num_headers > msg->headers.total) {
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new_headers = safecalloc(msg->headers.total * 2,
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sizeof(char *));
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if (new_headers == NULL)
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return -ENOMEM;
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/* Copy the array */
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for (i = 0; i != msg->headers.used; ++i)
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new_headers[i] = msg->headers.strings[i];
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/* Remove the old array and replace it with the new array */
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safefree(msg->headers.strings);
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msg->headers.strings = new_headers;
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msg->headers.total *= 2;
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}
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/*
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* Add the new headers to the structure
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*/
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for (i = 0; i != num_headers; ++i)
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msg->headers.strings[i + msg->headers.used] = headers[i];
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msg->headers.used += num_headers;
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return 0;
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}
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/*
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* Send the completed HTTP message via the supplied file descriptor.
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*/
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int
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http_message_send(http_message_t msg, int fd)
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{
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char timebuf[30];
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time_t global_time;
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unsigned int i;
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assert(is_http_message_valid(msg));
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/* Check for valid arguments */
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if (msg == NULL)
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return -EFAULT;
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if (fd < 1)
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return -EBADF;
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if (!is_http_message_valid(msg))
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return -EINVAL;
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/* Write the response line */
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write_message(fd, "HTTP/1.0 %d %s\r\n",
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msg->response.code, msg->response.string);
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/* Go through all the headers */
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for (i = 0; i != msg->headers.used; ++i)
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write_message(fd, "%s\r\n", msg->headers.strings[i]);
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/* Output the date */
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global_time = time(NULL);
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strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT",
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gmtime(&global_time));
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write_message(fd, "Date: %s\r\n", timebuf);
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/* Output the content-length */
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write_message(fd, "Content-length: %u\r\n", msg->body.length);
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/* Write the separator between the headers and body */
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safe_write(fd, "\r\n", 2);
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/* If there's a body, send it! */
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if (msg->body.length > 0)
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safe_write(fd, msg->body.text, msg->body.length);
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return 0;
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}
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