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nginx/src/http/ngx_http_parse.c
Igor Sysoev 8a2b2fb4fb nginx-0.3.38-RELEASE import 
*) Feature: the ngx_http_dav_module.

    *) Change: the ngx_http_perl_module optimizations.
       Thanks to Sergey Skvortsov.

    *) Feature: the ngx_http_perl_module supports the $r->request_body_file
       method.

    *) Feature: the "client_body_in_file_only" directive.

    *) Workaround: now on disk overflow nginx tries to write access logs
       once a second only.
       Thanks to Anton Yuzhaninov and Maxim Dounin.

    *) Bugfix: now the "limit_rate" directive more precisely limits rate if
       rate is more than 100 Kbyte/s.
       Thanks to ForJest.

    *) Bugfix: now the IMAP/POP3 proxy escapes the "\r" and "\n" symbols in
       login and password to pass authorization server.
       Thanks to Maxim Dounin.
2006-04-14 09:53:38 +00:00

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
ngx_int_t
ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
{
u_char c, ch, *p, *m;
enum {
sw_start = 0,
sw_method,
sw_space_after_method,
sw_spaces_before_uri,
sw_schema,
sw_schema_slash,
sw_schema_slash_slash,
sw_host,
sw_port,
sw_after_slash_in_uri,
sw_check_uri,
sw_uri,
sw_http_09,
sw_http_H,
sw_http_HT,
sw_http_HTT,
sw_http_HTTP,
sw_first_major_digit,
sw_major_digit,
sw_first_minor_digit,
sw_minor_digit,
sw_almost_done
} state;
state = r->state;
for (p = b->pos; p < b->last; p++) {
ch = *p;
/* gcc 2.95.2 and msvc 6.0 compile this switch as an jump table */
switch (state) {
/* HTTP methods: GET, HEAD, POST */
case sw_start:
r->request_start = p;
if (ch == CR || ch == LF) {
break;
}
if (ch < 'A' || ch > 'Z') {
return NGX_HTTP_PARSE_INVALID_METHOD;
}
state = sw_method;
break;
case sw_method:
if (ch == ' ') {
r->method_end = p - 1;
m = r->request_start;
if (p - m == 3) {
if (m[0] == 'G' && m[1] == 'E' && m[2] == 'T') {
r->method = NGX_HTTP_GET;
} else if (m[0] == 'P' && m[1] == 'U' && m[2] == 'T') {
r->method = NGX_HTTP_PUT;
}
} else if (p - m == 4) {
if (m[0] == 'P' && m[1] == 'O'
&& m[2] == 'S' && m[3] == 'T')
{
r->method = NGX_HTTP_POST;
} else if (m[0] == 'H' && m[1] == 'E'
&& m[2] == 'A' && m[3] == 'D')
{
r->method = NGX_HTTP_HEAD;
}
} else if (p - m == 6) {
if (m[0] == 'D' && m[1] == 'E' && m[2] == 'L'
&& m[3] == 'E' && m[4] == 'T' && m[5] == 'E')
{
r->method = NGX_HTTP_DELETE;
}
}
state = sw_spaces_before_uri;
break;
}
if (ch < 'A' || ch > 'Z') {
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
/* single space after method */
case sw_space_after_method:
switch (ch) {
case ' ':
state = sw_spaces_before_uri;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
/* space* before URI */
case sw_spaces_before_uri:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
r->schema_start = p;
state = sw_schema;
break;
}
switch (ch) {
case '/':
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
case ' ':
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_schema:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
break;
}
switch (ch) {
case ':':
r->schema_end = p;
state = sw_schema_slash;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_schema_slash:
switch (ch) {
case '/':
state = sw_schema_slash_slash;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_schema_slash_slash:
switch (ch) {
case '/':
r->host_start = p;
state = sw_host;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_host:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
break;
}
if ((ch >= '0' && ch <= '9') || ch == '.' || ch == '-')
{
break;
}
switch (ch) {
case ':':
r->host_end = p;
state = sw_port;
break;
case '/':
r->host_end = p;
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_port:
if (ch >= '0' && ch <= '9') {
break;
}
switch (ch) {
case '/':
r->port_end = p;
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
/* check "/.", "//", "%", and "\" (Win32) in URI */
case sw_after_slash_in_uri:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
state = sw_check_uri;
break;
}
if (ch >= '0' && ch <= '9') {
state = sw_check_uri;
break;
}
switch (ch) {
case ' ':
r->uri_end = p;
state = sw_http_09;
break;
case CR:
r->uri_end = p;
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->uri_end = p;
r->http_minor = 9;
goto done;
case '.':
r->complex_uri = 1;
state = sw_uri;
break;
case '%':
r->quoted_uri = 1;
state = sw_uri;
break;
case '/':
r->complex_uri = 1;
state = sw_uri;
break;
#if (NGX_WIN32)
case '\\':
r->complex_uri = 1;
state = sw_uri;
break;
#endif
case '?':
r->args_start = p + 1;
state = sw_uri;
break;
case '+':
r->plus_in_uri = 1;
break;
case '\0':
r->zero_in_uri = 1;
break;
default:
state = sw_check_uri;
break;
}
break;
/* check "/", "%" and "\" (Win32) in URI */
case sw_check_uri:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
break;
}
if (ch >= '0' && ch <= '9') {
break;
}
switch (ch) {
case '/':
r->uri_ext = NULL;
state = sw_after_slash_in_uri;
break;
case '.':
r->uri_ext = p + 1;
break;
case ' ':
r->uri_end = p;
state = sw_http_09;
break;
case CR:
r->uri_end = p;
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->uri_end = p;
r->http_minor = 9;
goto done;
#if (NGX_WIN32)
case '\\':
r->complex_uri = 1;
state = sw_after_slash_in_uri;
break;
#endif
case '%':
r->quoted_uri = 1;
state = sw_uri;
break;
case '+':
r->plus_in_uri = 1;
break;
case '?':
r->args_start = p + 1;
state = sw_uri;
break;
case '\0':
r->zero_in_uri = 1;
break;
}
break;
/* URI */
case sw_uri:
switch (ch) {
case ' ':
r->uri_end = p;
state = sw_http_09;
break;
case CR:
r->uri_end = p;
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->uri_end = p;
r->http_minor = 9;
goto done;
case '+':
r->plus_in_uri = 1;
break;
case '\0':
r->zero_in_uri = 1;
break;
}
break;
/* space+ after URI */
case sw_http_09:
switch (ch) {
case ' ':
break;
case CR:
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->http_minor = 9;
goto done;
case 'H':
r->http_protocol.data = p;
state = sw_http_H;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_H:
switch (ch) {
case 'T':
state = sw_http_HT;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HT:
switch (ch) {
case 'T':
state = sw_http_HTT;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HTT:
switch (ch) {
case 'P':
state = sw_http_HTTP;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HTTP:
switch (ch) {
case '/':
state = sw_first_major_digit;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
/* first digit of major HTTP version */
case sw_first_major_digit:
if (ch < '1' || ch > '9') {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
r->http_major = ch - '0';
state = sw_major_digit;
break;
/* major HTTP version or dot */
case sw_major_digit:
if (ch == '.') {
state = sw_first_minor_digit;
break;
}
if (ch < '0' || ch > '9') {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
r->http_major = r->http_major * 10 + ch - '0';
break;
/* first digit of minor HTTP version */
case sw_first_minor_digit:
if (ch < '0' || ch > '9') {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
r->http_minor = ch - '0';
state = sw_minor_digit;
break;
/* minor HTTP version or end of request line */
case sw_minor_digit:
if (ch == CR) {
state = sw_almost_done;
break;
}
if (ch == LF) {
goto done;
}
if (ch < '0' || ch > '9') {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
r->http_minor = r->http_minor * 10 + ch - '0';
break;
/* end of request line */
case sw_almost_done:
r->request_end = p - 1;
switch (ch) {
case LF:
goto done;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
}
}
b->pos = p;
r->state = state;
return NGX_AGAIN;
done:
b->pos = p + 1;
if (r->request_end == NULL) {
r->request_end = p;
}
r->http_version = r->http_major * 1000 + r->http_minor;
r->state = sw_start;
if (r->http_version == 9 && r->method != NGX_HTTP_GET) {
return NGX_HTTP_PARSE_INVALID_09_METHOD;
}
return NGX_OK;
}
ngx_int_t
ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b)
{
u_char c, ch, *p;
ngx_uint_t hash;
enum {
sw_start = 0,
sw_name,
sw_space_before_value,
sw_value,
sw_space_after_value,
sw_ignore_line,
sw_almost_done,
sw_header_almost_done
} state;
state = r->state;
hash = r->header_hash;
for (p = b->pos; p < b->last; p++) {
ch = *p;
switch (state) {
/* first char */
case sw_start:
r->invalid_header = 0;
switch (ch) {
case CR:
r->header_end = p;
state = sw_header_almost_done;
break;
case LF:
r->header_end = p;
goto header_done;
default:
state = sw_name;
r->header_name_start = p;
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
hash = c;
break;
}
if (ch >= '0' && ch <= '9') {
hash = ch;
break;
}
r->invalid_header = 1;
break;
}
break;
/* header name */
case sw_name:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
hash += c;
break;
}
if (ch == ':') {
r->header_name_end = p;
state = sw_space_before_value;
break;
}
if (ch == '-') {
hash += ch;
break;
}
if (ch >= '0' && ch <= '9') {
hash += ch;
break;
}
if (ch == CR) {
r->header_name_end = p;
r->header_start = p;
r->header_end = p;
state = sw_almost_done;
break;
}
if (ch == LF) {
r->header_name_end = p;
r->header_start = p;
r->header_end = p;
goto done;
}
/* IIS may send the duplicate "HTTP/1.1 ..." lines */
if (ch == '/'
&& r->upstream
&& p - r->header_name_start == 4
&& ngx_strncmp(r->header_name_start, "HTTP", 4) == 0)
{
state = sw_ignore_line;
break;
}
r->invalid_header = 1;
break;
/* space* before header value */
case sw_space_before_value:
switch (ch) {
case ' ':
break;
case CR:
r->header_start = p;
r->header_end = p;
state = sw_almost_done;
break;
case LF:
r->header_start = p;
r->header_end = p;
goto done;
default:
r->header_start = p;
state = sw_value;
break;
}
break;
/* header value */
case sw_value:
switch (ch) {
case ' ':
r->header_end = p;
state = sw_space_after_value;
break;
case CR:
r->header_end = p;
state = sw_almost_done;
break;
case LF:
r->header_end = p;
goto done;
}
break;
/* space* before end of header line */
case sw_space_after_value:
switch (ch) {
case ' ':
break;
case CR:
state = sw_almost_done;
break;
case LF:
goto done;
default:
state = sw_value;
break;
}
break;
/* ignore header line */
case sw_ignore_line:
switch (ch) {
case LF:
state = sw_start;
break;
default:
break;
}
break;
/* end of header line */
case sw_almost_done:
switch (ch) {
case CR:
break;
case LF:
goto done;
default:
return NGX_HTTP_PARSE_INVALID_HEADER;
}
break;
/* end of header */
case sw_header_almost_done:
switch (ch) {
case LF:
goto header_done;
default:
return NGX_HTTP_PARSE_INVALID_HEADER;
}
}
}
b->pos = p;
r->state = state;
r->header_hash = hash;
return NGX_AGAIN;
done:
b->pos = p + 1;
r->state = sw_start;
r->header_hash = hash;
return NGX_OK;
header_done:
b->pos = p + 1;
r->state = sw_start;
return NGX_HTTP_PARSE_HEADER_DONE;
}
ngx_int_t
ngx_http_parse_complex_uri(ngx_http_request_t *r)
{
u_char c, ch, decoded, *p, *u;
enum {
sw_usual = 0,
sw_slash,
sw_dot,
sw_dot_dot,
#if (NGX_WIN32)
sw_dot_dot_dot,
#endif
sw_quoted,
sw_quoted_second
} state, quoted_state;
#if (NGX_SUPPRESS_WARN)
decoded = '\0';
quoted_state = sw_usual;
#endif
state = sw_usual;
p = r->uri_start;
u = r->uri.data;
r->uri_ext = NULL;
r->args_start = NULL;
ch = *p++;
while (p <= r->uri_end) {
/*
* we use "ch = *p++" inside the cycle, but this operation is safe,
* because after the URI there is always at least one charcter:
* the line feed
*/
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"s:%d in:'%Xd:%c', out:'%c'", state, ch, ch, *u);
switch (state) {
case sw_usual:
switch(ch) {
#if (NGX_WIN32)
case '\\':
r->uri_ext = NULL;
if (p == r->uri_start + r->uri.len) {
/*
* we omit the last "\" to cause redirect because
* the browsers do not treat "\" as "/" in relative URL path
*/
break;
}
state = sw_slash;
*u++ = '/';
break;
#endif
case '/':
r->uri_ext = NULL;
state = sw_slash;
*u++ = ch;
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
case '?':
r->args_start = p;
goto done;
case '.':
r->uri_ext = u + 1;
*u++ = ch;
break;
default:
*u++ = ch;
break;
}
ch = *p++;
break;
case sw_slash:
switch(ch) {
#if (NGX_WIN32)
case '\\':
#endif
case '/':
break;
case '.':
state = sw_dot;
*u++ = ch;
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
case '?':
r->args_start = p;
goto done;
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
case sw_dot:
switch(ch) {
#if (NGX_WIN32)
case '\\':
#endif
case '/':
state = sw_slash;
u--;
break;
case '.':
state = sw_dot_dot;
*u++ = ch;
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
case '?':
r->args_start = p;
goto done;
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
case sw_dot_dot:
switch(ch) {
#if (NGX_WIN32)
case '\\':
#endif
case '/':
state = sw_slash;
u -= 4;
if (u < r->uri.data) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
while (*(u - 1) != '/') {
u--;
}
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
case '?':
r->args_start = p;
goto done;
#if (NGX_WIN32)
case '.':
state = sw_dot_dot_dot;
*u++ = ch;
break;
#endif
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
#if (NGX_WIN32)
case sw_dot_dot_dot:
switch(ch) {
case '\\':
case '/':
state = sw_slash;
u -= 5;
if (u < r->uri.data) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
while (*u != '/') {
u--;
}
if (u < r->uri.data) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
while (*(u - 1) != '/') {
u--;
}
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
case '?':
r->args_start = p;
goto done;
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
#endif
case sw_quoted:
if (ch >= '0' && ch <= '9') {
decoded = (u_char) (ch - '0');
state = sw_quoted_second;
ch = *p++;
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'f') {
decoded = (u_char) (c - 'a' + 10);
state = sw_quoted_second;
ch = *p++;
break;
}
return NGX_HTTP_PARSE_INVALID_REQUEST;
case sw_quoted_second:
if (ch >= '0' && ch <= '9') {
ch = (u_char) ((decoded << 4) + ch - '0');
if (ch == '%') {
state = sw_usual;
*u++ = ch;
ch = *p++;
break;
}
if (ch == '\0') {
r->zero_in_uri = 1;
*u++ = ch;
ch = *p++;
}
state = quoted_state;
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'f') {
ch = (u_char) ((decoded << 4) + c - 'a' + 10);
if (ch == '?') {
*u++ = ch;
ch = *p++;
}
state = quoted_state;
break;
}
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
}
done:
r->uri.len = u - r->uri.data;
r->uri.data[r->uri.len] = '\0';
if (r->uri_ext) {
r->exten.len = u - r->uri_ext;
r->exten.data = r->uri_ext;
}
r->uri_ext = NULL;
return NGX_OK;
}
ngx_int_t
ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
ngx_str_t *args, ngx_uint_t *flags)
{
u_char ch, *p;
size_t len;
len = uri->len;
p = uri->data;
if (len == 0 || p[0] == '?') {
goto unsafe;
}
if (p[0] == '.' && len == 3 && p[1] == '.' && (p[2] == '/'
#if (NGX_WIN32)
|| p[2] == '\\'
#endif
))
{
goto unsafe;
}
for ( /* void */ ; len; len--) {
ch = *p++;
if (ch == '?') {
args->len = len - 1;
args->data = p;
uri->len -= len;
return NGX_OK;
}
if (ch == '\0') {
*flags |= NGX_HTTP_ZERO_IN_URI;
continue;
}
if (ch != '/'
#if (NGX_WIN32)
&& ch != '\\'
#endif
)
{
continue;
}
if (len > 2) {
/* detect "/../" */
if (p[0] == '.' && p[1] == '.' && p[2] == '/') {
goto unsafe;
}
#if (NGX_WIN32)
if (p[2] == '\\') {
goto unsafe;
}
if (len > 3) {
/* detect "/.../" */
if (p[0] == '.' && p[1] == '.' && p[2] == '.'
&& (p[3] == '/' || p[3] == '\\'))
{
goto unsafe;
}
}
#endif
}
}
return NGX_OK;
unsafe:
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"unsafe URI \"%V\" was detected", uri);
return NGX_ERROR;
}
ngx_int_t
ngx_http_parse_multi_header_lines(ngx_array_t *headers, ngx_str_t *name,
ngx_str_t *value)
{
ngx_uint_t i;
u_char *start, *last, *end, ch;
ngx_table_elt_t **h;
h = headers->elts;
for (i = 0; i < headers->nelts; i++) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, headers->pool->log, 0,
"parse header: \"%V: %V\"", &h[i]->key, &h[i]->value);
if (name->len > h[i]->value.len) {
continue;
}
start = h[i]->value.data;
end = h[i]->value.data + h[i]->value.len;
while (start < end) {
if (ngx_strncasecmp(start, name->data, name->len) != 0) {
goto skip;
}
for (start += name->len; start < end && *start == ' '; start++) {
/* void */
}
if (value == NULL) {
if (start == end || *start == ',') {
return i;
}
goto skip;
}
if (start == end || *start++ != '=') {
/* the invalid header value */
goto skip;
}
while (start < end && *start == ' ') { start++; }
for (last = start; last < end && *last != ';'; last++) {
/* void */
}
value->len = last - start;
value->data = start;
return i;
skip:
while (start < end) {
ch = *start++;
if (ch == ';' || ch == ',') {
break;
}
}
while (start < end && *start == ' ') { start++; }
}
}
return NGX_DECLINED;
}
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