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nginx/nginx/812333214f649505ca6d15582a232bda6fc63270/./src/http/ngx_http_parse.c
blob: 38ee9ecb94d13ba5586c3d0869106a991e9af97e [file]
#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)
{
char ch, *p;
enum {
sw_start = 0,
sw_G,
sw_GE,
sw_H,
sw_HE,
sw_HEA,
sw_P,
sw_PO,
sw_POS,
sw_space_after_method,
sw_spaces_before_uri,
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,
sw_done
} state;
state = r->state;
p = r->header_in->pos;
while (p < r->header_in->last && state < sw_done) {
ch = *p++;
/* gcc 2.95.2 and vc 6.0 compile this switch as an jump table */
switch (state) {
/* HTTP methods: GET, HEAD, POST */
case sw_start:
r->request_start = p - 1;
switch (ch) {
case 'G':
state = sw_G;
break;
case 'H':
state = sw_H;
break;
case 'P':
state = sw_P;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_G:
switch (ch) {
case 'E':
state = sw_GE;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_GE:
switch (ch) {
case 'T':
r->method = NGX_HTTP_GET;
state = sw_space_after_method;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_H:
switch (ch) {
case 'E':
state = sw_HE;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_HE:
switch (ch) {
case 'A':
state = sw_HEA;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_HEA:
switch (ch) {
case 'D':
r->method = NGX_HTTP_HEAD;
state = sw_space_after_method;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_P:
switch (ch) {
case 'O':
state = sw_PO;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_PO:
switch (ch) {
case 'S':
state = sw_POS;
break;
default:
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
case sw_POS:
switch (ch) {
case 'T':
r->method = NGX_HTTP_POST;
state = sw_space_after_method;
break;
default:
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:
switch (ch) {
case '/':
r->uri_start = p - 1;
state = sw_after_slash_in_uri;
break;
case ' ':
break;
default:
r->unusual_uri = 1;
r->uri_start = p - 1;
state = sw_uri;
break;
}
break;
/* check "/.", "//", and "%" in URI */
case sw_after_slash_in_uri:
switch (ch) {
case CR:
r->uri_end = p - 1;
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->uri_end = p - 1;
r->http_minor = 9;
state = sw_done;
break;
case ' ':
r->uri_end = p - 1;
state = sw_http_09;
break;
case '.':
case '%':
r->complex_uri = 1;
state = sw_uri;
break;
case '/':
r->complex_uri = 1;
break;
case '?':
r->args_start = p;
state = sw_uri;
break;
default:
state = sw_check_uri;
break;
}
break;
/* check "/" and "%" in URI */
case sw_check_uri:
switch (ch) {
case CR:
r->uri_end = p - 1;
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->uri_end = p - 1;
r->http_minor = 9;
state = sw_done;
break;
case ' ':
r->uri_end = p - 1;
state = sw_http_09;
break;
case '.':
r->uri_ext = p;
break;
case '/':
r->uri_ext = NULL;
state = sw_after_slash_in_uri;
break;
case '%':
r->complex_uri = 1;
state = sw_uri;
break;
case '?':
r->args_start = p;
state = sw_uri;
break;
}
break;
/* URI */
case sw_uri:
switch (ch) {
case CR:
r->uri_end = p - 1;
r->http_minor = 9;
state = sw_almost_done;
break;
case LF:
r->uri_end = p - 1;
r->http_minor = 9;
state = sw_done;
break;
case ' ':
r->uri_end = p - 1;
state = sw_http_09;
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;
state = sw_done;
break;
case 'H':
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) {
state = sw_done;
break;
}
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 - 2;
switch (ch) {
case LF:
state = sw_done;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
/* suppress warning */
case sw_done:
break;
}
}
r->header_in->pos = p;
if (state == sw_done) {
if (r->request_end == NULL) {
r->request_end = p - 1;
}
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;
} else {
r->state = state;
return NGX_AGAIN;
}
}
ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_hunk_t *h)
{
char c, ch, *p;
enum {
sw_start = 0,
sw_name,
sw_space_before_value,
sw_value,
sw_space_after_value,
sw_almost_done,
sw_header_almost_done,
sw_ignore_line,
sw_done,
sw_header_done
} state;
state = r->state;
p = h->pos;
while (p < h->last && state < sw_done) {
ch = *p++;
switch (state) {
/* first char */
case sw_start:
switch (ch) {
case CR:
r->header_end = p - 1;
state = sw_header_almost_done;
break;
case LF:
r->header_end = p - 1;
state = sw_header_done;
break;
default:
state = sw_name;
r->header_name_start = p - 1;
c = ch | 0x20;
if (c >= 'a' && c <= 'z') {
break;
}
if (ch == '-' || ch == '_' || ch == '~' || ch == '.') {
break;
}
if (ch >= '0' && ch <= '9') {
break;
}
return NGX_HTTP_PARSE_INVALID_HEADER;
}
break;
/* header name */
case sw_name:
c = ch | 0x20;
if (c >= 'a' && c <= 'z') {
break;
}
if (ch == ':') {
r->header_name_end = p - 1;
state = sw_space_before_value;
break;
}
if (ch == '-' || ch == '_' || ch == '~' || ch == '.') {
break;
}
if (ch >= '0' && ch <= '9') {
break;
}
/* IIS can send duplicate "HTTP/1.1 ..." lines */
if (ch == '/'
&& r->proxy
&& p - r->header_start == 5
&& ngx_strncmp(r->header_start, "HTTP", 4) == 0)
{
state = sw_ignore_line;
break;
}
return NGX_HTTP_PARSE_INVALID_HEADER;
/* space* before header value */
case sw_space_before_value:
switch (ch) {
case ' ':
break;
case CR:
r->header_start = r->header_end = p - 1;
state = sw_almost_done;
break;
case LF:
r->header_start = r->header_end = p - 1;
state = sw_done;
break;
default:
r->header_start = p - 1;
state = sw_value;
break;
}
break;
/* header value */
case sw_value:
switch (ch) {
case ' ':
r->header_end = p - 1;
state = sw_space_after_value;
break;
case CR:
r->header_end = p - 1;
state = sw_almost_done;
break;
case LF:
r->header_end = p - 1;
state = sw_done;
break;
}
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:
state = sw_done;
break;
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 LF:
state = sw_done;
break;
default:
return NGX_HTTP_PARSE_INVALID_HEADER;
}
break;
/* end of header */
case sw_header_almost_done:
switch (ch) {
case LF:
state = sw_header_done;
break;
default:
return NGX_HTTP_PARSE_INVALID_HEADER;
}
break;
/* suppress warning */
case sw_done:
case sw_header_done:
break;
}
}
h->pos = p;
if (state == sw_done) {
r->state = sw_start;
return NGX_OK;
} else if (state == sw_header_done) {
r->state = sw_start;
return NGX_HTTP_PARSE_HEADER_DONE;
} else {
r->state = state;
return NGX_AGAIN;
}
}
ngx_int_t ngx_http_parse_complex_uri(ngx_http_request_t *r)
{
char c, ch, decoded, *p, *u;
enum {
sw_usual = 0,
sw_slash,
sw_dot,
sw_dot_dot,
#if (WIN32)
sw_dot_dot_dot,
#endif
sw_quoted,
sw_quoted_second
} state, quoted_state;
decoded = '\0';
quoted_state = sw_usual;
state = sw_usual;
p = r->uri_start;
u = r->uri.data;
r->uri_ext = NULL;
ch = *p++;
while (p < r->uri_start + r->uri.len + 1) {
ngx_log_debug(r->connection->log, "S: %d UN: '%x:%c', URI: '%c'" _
state _ ch _ ch _ *u);
switch (state) {
case sw_usual:
switch(ch) {
case '/':
r->uri_ext = NULL;
state = sw_slash;
*u++ = ch;
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
case '.':
r->uri_ext = u + 1;
default:
*u++ = ch;
break;
}
ch = *p++;
break;
case sw_slash:
switch(ch) {
case '/':
break;
case '.':
state = sw_dot;
*u++ = ch;
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
case sw_dot:
switch(ch) {
case '/':
state = sw_slash;
u--;
break;
case '.':
state = sw_dot_dot;
*u++ = ch;
break;
case '%':
quoted_state = state;
state = sw_quoted;
break;
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
case sw_dot_dot:
switch(ch) {
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;
#if (WIN32)
case '.':
state = sw_dot_dot_dot;
*u++ = ch;
break;
#endif
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
#if (WIN32)
case sw_dot_dot_dot:
switch(ch) {
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;
default:
state = sw_usual;
*u++ = ch;
break;
}
ch = *p++;
break;
#endif
case sw_quoted:
if (ch >= '0' && ch <= '9') {
decoded = ch - '0';
state = sw_quoted_second;
ch = *p++;
break;
}
c = ch | 0x20;
if (c >= 'a' && c <= 'f') {
decoded = 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 = (decoded << 4) + ch - '0';
if (ch == '%') {
state = sw_usual;
*u++ = ch;
ch = *p++;
break;
}
state = quoted_state;
break;
}
c = ch | 0x20;
if (c >= 'a' && c <= 'f') {
ch = (decoded << 4) + c - 'a' + 10;
if (ch == '%') {
state = sw_usual;
*u++ = ch;
ch = *p++;
break;
}
state = quoted_state;
break;
}
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
}
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;
if (!(r->exten.data = ngx_palloc(r->pool, r->exten.len + 1))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_cpystrn(r->exten.data, r->uri_ext, r->exten.len + 1);
}
r->uri_ext = NULL;
return NGX_OK;
}