netsurf/utils/http.c

393 lines
7.9 KiB
C

/*
* Copyright 2010 John-Mark Bell <jmb@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* HTTP header parsing functions
*/
#include <inttypes.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils/http.h"
/**
* Representation of an HTTP parameter
*/
struct http_parameter {
struct http_parameter *next; /**< Next parameter in list, or NULL */
char *name; /**< Parameter name */
char *value; /**< Parameter value */
};
/**
* Determine if a character is valid for an HTTP token
*
* \param c Character to consider
* \return True if character is valid, false otherwise
*/
static bool http_is_token_char(uint8_t c)
{
/* [ 32 - 126 ] except ()<>@,;:\"/[]?={} SP HT */
if (c <= ' ' || 126 < c)
return false;
return (strchr("()<>@,;:\\\"/[]?={}", c) == NULL);
}
/**
* Parse an HTTP token
*
* \param input Pointer to current input byte. Updated on exit.
* \param value Pointer to location to receive on-heap token value.
* \return NSERROR_OK on success,
* NSERROR_NOMEM on memory exhaustion
*
* The returned value is owned by the caller
*/
static nserror http_parse_token(const char **input, char **value)
{
const uint8_t *start = (const uint8_t *) *input;
const uint8_t *end;
char *token;
end = start;
while (http_is_token_char(*end))
end++;
token = malloc(end - start + 1);
if (token == NULL)
return NSERROR_NOMEM;
memcpy(token, start, end - start);
token[end - start] = '\0';
*value = token;
*input = (const char *) end;
return NSERROR_OK;
}
/**
* Parse an HTTP quoted-string
*
* \param input Pointer to current input byte. Updated on exit.
* \param value Pointer to location to receive on-heap string value.
* \return NSERROR_OK on success,
* NSERROR_NOMEM on memory exhaustion
*
* The returned value is owned by the caller
*/
static nserror http_parse_quoted_string(const char **input, char **value)
{
const uint8_t *start = (const uint8_t *) *input;
const uint8_t *end;
uint8_t c;
char *string_value;
/* <"> *( qdtext | quoted-pair ) <">
* qdtext = any TEXT except <">
* quoted-pair = "\" CHAR
* TEXT = [ HT, CR, LF, 32-126, 128-255 ]
* CHAR = [ 0 - 127 ]
*
* \todo TEXT may contain non 8859-1 chars encoded per RFC 2047
* \todo Support quoted-pairs
*/
if (*start == '"') {
end = start = start + 1;
c = *end;
while (c == '\t' || c == '\r' || c == '\n' ||
c == ' ' || c == '!' ||
('#' <= c && c <= 126) || c > 127) {
end++;
c = *end;
}
if (*end != '"') {
start--;
end = start;
}
} else {
end = start;
}
string_value = malloc(end - start + 1);
if (string_value == NULL)
return NSERROR_NOMEM;
memcpy(string_value, start, end - start);
string_value[end - start] = '\0';
*value = string_value;
if (end != start)
*input = (const char *) end + 1;
return NSERROR_OK;
}
/**
* Parse an HTTP parameter
*
* \param input Pointer to current input byte. Updated on exit.
* \param parameter Pointer to location to receive on-heap parameter.
* \return NSERROR_OK on success,
* NSERROR_NOMEM on memory exhaustion
*
* The returned parameter is owned by the caller.
*/
static nserror http_parse_parameter(const char **input,
http_parameter **parameter)
{
const char *pos = *input;
char *name;
char *value;
http_parameter *param;
nserror error;
/* token "=" ( token | quoted-string ) */
error = http_parse_token(&pos, &name);
if (error != NSERROR_OK)
return error;
while (*pos == ' ' || *pos == '\t')
pos++;
if (*pos != '=') {
value = strdup("");
if (value == NULL) {
free(name);
return NSERROR_NOMEM;
}
} else {
pos++;
while (*pos == ' ' || *pos == '\t')
pos++;
if (*pos == '"')
error = http_parse_quoted_string(&pos, &value);
else
error = http_parse_token(&pos, &value);
if (error != NSERROR_OK) {
free(name);
return error;
}
}
param = malloc(sizeof(*param));
if (param == NULL) {
free(value);
free(name);
return NSERROR_NOMEM;
}
param->next = NULL;
param->name = name;
param->value = value;
*parameter = param;
*input = pos;
return NSERROR_OK;
}
/**
* Parse an HTTP parameter list
*
* \param input Pointer to current input byte. Updated on exit.
* \param parameters Pointer to location to receive on-heap parameter list.
* \return NSERROR_OK on success,
* NSERROR_NOMEM on memory exhaustion
*
* The returned parameter list is owned by the caller
*/
static nserror http_parse_parameter_list(const char **input,
http_parameter **parameters)
{
const char *pos = *input;
http_parameter *param;
http_parameter *list = NULL;
nserror error;
/* 1*( ";" parameter ) */
while (*pos == ';') {
pos++;
while (*pos == ' ' || *pos == '\t')
pos++;
error = http_parse_parameter(&pos, &param);
if (error != NSERROR_OK) {
while (list != NULL) {
param = list;
list = param->next;
free(param->name);
free(param->value);
free(param);
}
return error;
}
if (list != NULL)
param->next = list;
list = param;
while (*pos == ' ' || *pos == '\t')
pos++;
}
*parameters = list;
*input = pos;
return NSERROR_OK;
}
/* See http.h for documentation */
nserror http_parse_content_type(const char *header_value, char **media_type,
http_parameter **parameters)
{
const char *pos = header_value;
char *type;
char *subtype = NULL;
http_parameter *params = NULL;
char *mime;
size_t mime_len;
nserror error;
/* type "/" subtype *( ";" parameter ) */
while (*pos == ' ' || *pos == '\t')
pos++;
error = http_parse_token(&pos, &type);
if (error != NSERROR_OK)
return error;
while (*pos == ' ' || *pos == '\t')
pos++;
if (*pos == '/') {
pos++;
while (*pos == ' ' || *pos == '\t')
pos++;
error = http_parse_token(&pos, &subtype);
if (error != NSERROR_OK) {
free(type);
return error;
}
while (*pos == ' ' || *pos == '\t')
pos++;
if (*pos == ';') {
pos++;
while (*pos == ' ' || *pos == '\t')
pos++;
error = http_parse_parameter_list(&pos, &params);
if (error != NSERROR_OK) {
free(subtype);
free(type);
return error;
}
}
}
/* <type> + <subtype> + '/' */
mime_len = strlen(type) + (subtype != NULL ? strlen(subtype) : 0) + 1;
mime = malloc(mime_len + 1);
if (mime == NULL) {
http_parameter_list_destroy(params);
free(subtype);
free(type);
return NSERROR_OK;
}
sprintf(mime, "%s/%s", type, subtype != NULL ? subtype : "");
free(subtype);
free(type);
*media_type = mime;
*parameters = params;
return NSERROR_OK;
}
/* See http.h for documentation */
nserror http_parameter_list_find_item(const http_parameter *list,
const char *name, const char **value)
{
while (list != NULL && strcasecmp(name, list->name) != 0)
list = list->next;
if (list == NULL)
return NSERROR_NOT_FOUND;
*value = list->value;
return NSERROR_OK;
}
/* See http.h for documentation */
const http_parameter *http_parameter_list_iterate(const http_parameter *cur,
const char **name, const char **value)
{
if (cur == NULL)
return NULL;
*name = cur->name;
*value = cur->value;
return cur->next;
}
/* See http.h for documentation */
void http_parameter_list_destroy(http_parameter *list)
{
while (list != NULL) {
http_parameter *victim = list;
list = victim->next;
free(victim->name);
free(victim->value);
free(victim);
}
}