/**
* 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;
}
int http_parse_token_list_next(struct http_parser *parser,
const char **token_r)
{
/* http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21;
Appendix B:
For compatibility with legacy list rules, recipients SHOULD accept
empty list elements. In other words, consumers would follow the list
productions:
#element => [ ( "," / element ) *( OWS "," [ OWS element ] ) ]
1#element => *( "," OWS ) element *( OWS "," [ OWS element ] )
*/
for (;;) {
if (http_parse_token(parser, token_r) > 0)
break;
http_parse_ows(parser);
if (parser->cur >= parser->end || parser->cur[0] != ',')
return 0;
parser->cur++;
http_parse_ows(parser);
}
return 1;
}
int http_parse_token_or_qstring(struct http_parser *parser,
const char **word_r)
{
if (parser->cur >= parser->end)
return 0;
if (parser->cur[0] == '"')
return http_parse_quoted_string(parser, word_r);
return http_parse_token(parser, word_r);
}
static int
http_request_parse_expect_header(struct http_request_parser *parser,
struct http_request *request, const struct http_header_field *hdr)
{
struct http_message_parser *_parser = &parser->parser;
struct http_parser hparser;
bool parse_error = FALSE;
unsigned int num_expectations = 0;
/* Expect = 1#expectation
expectation = expect-name [ BWS "=" BWS expect-value ]
*( OWS ";" [ OWS expect-param ] )
expect-param = expect-name [ BWS "=" BWS expect-value ]
expect-name = token
expect-value = token / quoted-string
*/
http_parser_init(&hparser, (const unsigned char *)hdr->value, hdr->size);
while (!parse_error) {
const char *expect_name, *expect_value;
/* expect-name */
if (http_parse_token(&hparser, &expect_name) > 0) {
num_expectations++;
if (strcasecmp(expect_name, "100-continue") == 0) {
request->expect_100_continue = TRUE;
} else {
/* http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-23
Section 5.1.1:
If all received Expect header field(s) are syntactically valid but
contain an expectation that the recipient does not understand or
cannot comply with, the recipient MUST respond with a 417
(Expectation Failed) status code. A recipient of a syntactically
invalid Expectation header field MUST respond with a 4xx status code
other than 417.
--> Must check rest of expect header syntax before returning error.
*/
if (parser->error_code == HTTP_REQUEST_PARSE_ERROR_NONE) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_EXPECTATION_FAILED;
_parser->error = t_strdup_printf
("Unknown Expectation `%s'", expect_name);
}
}
/* BWS "=" BWS */
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end)
break;
if (*hparser.cur == '=') {
hparser.cur++;
http_parse_ows(&hparser);
/* value */
if (http_parse_word(&hparser, &expect_value) <= 0) {
parse_error = TRUE;
break;
}
if (parser->error_code == HTTP_REQUEST_PARSE_ERROR_NONE) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_EXPECTATION_FAILED;
_parser->error = t_strdup_printf
("Expectation `%s' has unexpected value", expect_name);
}
}
/* *( OWS ";" [ OWS expect-param ] ) */
while (!parse_error) {
const char *attribute, *value;
/* OWS ";" */
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end || *hparser.cur != ';')
break;
hparser.cur++;
http_parse_ows(&hparser);
/* expect-param */
if (http_parse_token(&hparser, &attribute) <= 0) {
parse_error = TRUE;
break;
}
/* BWS "=" BWS */
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end || *hparser.cur != '=') {
parse_error = TRUE;
break;
}
hparser.cur++;
http_parse_ows(&hparser);
/* value */
if (http_parse_word(&hparser, &value) <= 0) {
parse_error = TRUE;
break;
}
if (parser->error_code == HTTP_REQUEST_PARSE_ERROR_NONE) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_EXPECTATION_FAILED;
_parser->error = t_strdup_printf
("Expectation `%s' has unknown parameter `'%s'",
expect_name, attribute);
}
}
if (parse_error)
break;
}
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end || *hparser.cur != ',')
break;
hparser.cur++;
http_parse_ows(&hparser);
}
if (parse_error || hparser.cur < hparser.end) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_BAD_REQUEST;
_parser->error = "Invalid Expect header";
return -1;
}
if (parser->error_code != HTTP_REQUEST_PARSE_ERROR_NONE)
return -1;
if (num_expectations == 0) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_BAD_REQUEST;
_parser->error = "Empty Expect header";
return -1;
}
return 0;
}
/* 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, ¶ms);
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;
}
static int
http_request_parse_expect_header(struct http_request_parser *parser,
struct http_request *request, const struct http_header_field *hdr)
{
struct http_message_parser *_parser = &parser->parser;
struct http_parser hparser;
bool parse_error = FALSE;
unsigned int num_expectations = 0;
/* RFC 7231, Section 5.1.1:
Expect = "100-continue"
*/
// FIXME: simplify; RFC 7231 discarded Expect extension mechanism
http_parser_init(&hparser, (const unsigned char *)hdr->value, hdr->size);
while (!parse_error) {
const char *expect_name, *expect_value;
/* expect-name */
if (http_parse_token(&hparser, &expect_name) > 0) {
num_expectations++;
if (strcasecmp(expect_name, "100-continue") == 0) {
request->expect_100_continue = TRUE;
} else {
if (parser->error_code == HTTP_REQUEST_PARSE_ERROR_NONE) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_EXPECTATION_FAILED;
_parser->error = t_strdup_printf
("Unknown Expectation `%s'", expect_name);
}
}
/* BWS "=" BWS */
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end)
break;
if (*hparser.cur == '=') {
hparser.cur++;
http_parse_ows(&hparser);
/* value */
if (http_parse_token_or_qstring(&hparser, &expect_value) <= 0) {
parse_error = TRUE;
break;
}
if (parser->error_code == HTTP_REQUEST_PARSE_ERROR_NONE) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_EXPECTATION_FAILED;
_parser->error = t_strdup_printf
("Expectation `%s' has unexpected value", expect_name);
}
}
/* *( OWS ";" [ OWS expect-param ] ) */
while (!parse_error) {
const char *attribute, *value;
/* OWS ";" */
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end || *hparser.cur != ';')
break;
hparser.cur++;
http_parse_ows(&hparser);
/* expect-param */
if (http_parse_token(&hparser, &attribute) <= 0) {
parse_error = TRUE;
break;
}
/* BWS "=" BWS */
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end || *hparser.cur != '=') {
parse_error = TRUE;
break;
}
hparser.cur++;
http_parse_ows(&hparser);
/* value */
if (http_parse_token_or_qstring(&hparser, &value) <= 0) {
parse_error = TRUE;
break;
}
if (parser->error_code == HTTP_REQUEST_PARSE_ERROR_NONE) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_EXPECTATION_FAILED;
_parser->error = t_strdup_printf
("Expectation `%s' has unknown parameter `'%s'",
expect_name, attribute);
}
}
if (parse_error)
break;
}
http_parse_ows(&hparser);
if (hparser.cur >= hparser.end || *hparser.cur != ',')
break;
hparser.cur++;
http_parse_ows(&hparser);
}
if (parse_error || hparser.cur < hparser.end) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_BAD_REQUEST;
_parser->error = "Invalid Expect header";
return -1;
}
if (parser->error_code != HTTP_REQUEST_PARSE_ERROR_NONE)
return -1;
if (num_expectations == 0) {
parser->error_code = HTTP_REQUEST_PARSE_ERROR_BAD_REQUEST;
_parser->error = "Empty Expect header";
return -1;
}
return 0;
}
