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ngx_http_parse.c
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// annotated by chrono since 2016
//
// 使用状态机解析，会调整缓冲区里的指针位置
//
// * ngx_http_parse_request_line
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static uint32_t usual[] = {
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0x7fff37d6, /* 0111 1111 1111 1111 0011 0111 1101 0110 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
#if (NGX_WIN32)
0xefffffff, /* 1110 1111 1111 1111 1111 1111 1111 1111 */
#else
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
#endif
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0x7fffffff, /* 0111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
// 使用宏加速字符串比较，小优化
// 实际上是转化为整数
#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
#define ngx_str3_cmp(m, c0, c1, c2, c3) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0)
#define ngx_str3Ocmp(m, c0, c1, c2, c3) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0)
#define ngx_str4cmp(m, c0, c1, c2, c3) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0)
#define ngx_str5cmp(m, c0, c1, c2, c3, c4) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0) \
&& m[4] == c4
#define ngx_str6cmp(m, c0, c1, c2, c3, c4, c5) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0) \
&& (((uint32_t *) m)[1] & 0xffff) == ((c5 << 8) | c4)
#define ngx_str7_cmp(m, c0, c1, c2, c3, c4, c5, c6, c7) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0) \
&& ((uint32_t *) m)[1] == ((c7 << 24) | (c6 << 16) | (c5 << 8) | c4)
#define ngx_str8cmp(m, c0, c1, c2, c3, c4, c5, c6, c7) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0) \
&& ((uint32_t *) m)[1] == ((c7 << 24) | (c6 << 16) | (c5 << 8) | c4)
#define ngx_str9cmp(m, c0, c1, c2, c3, c4, c5, c6, c7, c8) \
*(uint32_t *) m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0) \
&& ((uint32_t *) m)[1] == ((c7 << 24) | (c6 << 16) | (c5 << 8) | c4) \
&& m[8] == c8
#else /* !(NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) */
#define ngx_str3_cmp(m, c0, c1, c2, c3) \
m[0] == c0 && m[1] == c1 && m[2] == c2
#define ngx_str3Ocmp(m, c0, c1, c2, c3) \
m[0] == c0 && m[2] == c2 && m[3] == c3
#define ngx_str4cmp(m, c0, c1, c2, c3) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3
#define ngx_str5cmp(m, c0, c1, c2, c3, c4) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3 && m[4] == c4
#define ngx_str6cmp(m, c0, c1, c2, c3, c4, c5) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3 \
&& m[4] == c4 && m[5] == c5
#define ngx_str7_cmp(m, c0, c1, c2, c3, c4, c5, c6, c7) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3 \
&& m[4] == c4 && m[5] == c5 && m[6] == c6
#define ngx_str8cmp(m, c0, c1, c2, c3, c4, c5, c6, c7) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3 \
&& m[4] == c4 && m[5] == c5 && m[6] == c6 && m[7] == c7
#define ngx_str9cmp(m, c0, c1, c2, c3, c4, c5, c6, c7, c8) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3 \
&& m[4] == c4 && m[5] == c5 && m[6] == c6 && m[7] == c7 && m[8] == c8
#endif
/* gcc, icc, msvc and others compile these switches as an jump table */
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_spaces_before_uri,
sw_schema,
sw_schema_slash,
sw_schema_slash_slash,
sw_host_start,
sw_host,
sw_host_end,
sw_host_ip_literal,
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_spaces_after_digit,
sw_almost_done
} state;
// 当前的状态
state = r->state;
for (p = b->pos; p < b->last; p++) {
ch = *p;
switch (state) {
/* HTTP methods: GET, HEAD, POST */
// 起始状态
case sw_start:
// 数据的开始位置
r->request_start = p;
if (ch == CR || ch == LF) {
break;
}
// 必须是大写字母，可以是_或-
// 否则出错
if ((ch < 'A' || ch > 'Z') && ch != '_' && ch != '-') {
return NGX_HTTP_PARSE_INVALID_METHOD;
}
// 转入解析method状态
state = sw_method;
break;
// 解析method状态
case sw_method:
// 遇到空格才检测method
if (ch == ' ') {
// method的结束位置
r->method_end = p - 1;
// method的开始位置
m = r->request_start;
// 看method多长
switch (p - m) {
// 3个字符就是get或put
case 3:
if (ngx_str3_cmp(m, 'G', 'E', 'T', ' ')) {
r->method = NGX_HTTP_GET;
break;
}
if (ngx_str3_cmp(m, 'P', 'U', 'T', ' ')) {
r->method = NGX_HTTP_PUT;
break;
}
break;
// 四个字符是post等
case 4:
if (m[1] == 'O') {
if (ngx_str3Ocmp(m, 'P', 'O', 'S', 'T')) {
r->method = NGX_HTTP_POST;
break;
}
if (ngx_str3Ocmp(m, 'C', 'O', 'P', 'Y')) {
r->method = NGX_HTTP_COPY;
break;
}
if (ngx_str3Ocmp(m, 'M', 'O', 'V', 'E')) {
r->method = NGX_HTTP_MOVE;
break;
}
if (ngx_str3Ocmp(m, 'L', 'O', 'C', 'K')) {
r->method = NGX_HTTP_LOCK;
break;
}
} else {
if (ngx_str4cmp(m, 'H', 'E', 'A', 'D')) {
r->method = NGX_HTTP_HEAD;
break;
}
}
break;
// 5个字符
case 5:
if (ngx_str5cmp(m, 'M', 'K', 'C', 'O', 'L')) {
r->method = NGX_HTTP_MKCOL;
break;
}
if (ngx_str5cmp(m, 'P', 'A', 'T', 'C', 'H')) {
r->method = NGX_HTTP_PATCH;
break;
}
if (ngx_str5cmp(m, 'T', 'R', 'A', 'C', 'E')) {
r->method = NGX_HTTP_TRACE;
break;
}
break;
// 6个字符
case 6:
if (ngx_str6cmp(m, 'D', 'E', 'L', 'E', 'T', 'E')) {
r->method = NGX_HTTP_DELETE;
break;
}
if (ngx_str6cmp(m, 'U', 'N', 'L', 'O', 'C', 'K')) {
r->method = NGX_HTTP_UNLOCK;
break;
}
break;
// 7个字符
case 7:
if (ngx_str7_cmp(m, 'O', 'P', 'T', 'I', 'O', 'N', 'S', ' '))
{
r->method = NGX_HTTP_OPTIONS;
}
if (ngx_str7_cmp(m, 'C', 'O', 'N', 'N', 'E', 'C', 'T', ' '))
{
r->method = NGX_HTTP_CONNECT;
}
break;
// 8个字符
case 8:
if (ngx_str8cmp(m, 'P', 'R', 'O', 'P', 'F', 'I', 'N', 'D'))
{
r->method = NGX_HTTP_PROPFIND;
}
break;
// 9个字符
case 9:
if (ngx_str9cmp(m,
'P', 'R', 'O', 'P', 'P', 'A', 'T', 'C', 'H'))
{
r->method = NGX_HTTP_PROPPATCH;
}
break;
}
// method解析完毕，进入uri前的空格状态
state = sw_spaces_before_uri;
break;
}
// 必须是大写字母，可以是_或-
// 否则出错
if ((ch < 'A' || ch > 'Z') && ch != '_' && ch != '-') {
return NGX_HTTP_PARSE_INVALID_METHOD;
}
break;
/* space* before URI */
// method解析完毕，进入uri前的空格状态
case sw_spaces_before_uri:
// 通常的uri开头是/
if (ch == '/') {
r->uri_start = p;
// 进入解析uri的状态
state = sw_after_slash_in_uri;
break;
}
// 不规范的uri
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
r->schema_start = p;
// 进入解析shema状态
state = sw_schema;
break;
}
switch (ch) {
case ' ':
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
// 进入解析shema状态
case sw_schema:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
break;
}
if ((ch >= '0' && ch <= '9') || ch == '+' || ch == '-' || ch == '.')
{
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 '/':
state = sw_host_start;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_host_start:
r->host_start = p;
if (ch == '[') {
state = sw_host_ip_literal;
break;
}
state = sw_host;
/* fall through */
case sw_host:
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
break;
}
if ((ch >= '0' && ch <= '9') || ch == '.' || ch == '-') {
break;
}
/* fall through */
case sw_host_end:
r->host_end = p;
switch (ch) {
case ':':
state = sw_port;
break;
case '/':
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
case '?':
r->uri_start = p;
r->args_start = p + 1;
r->empty_path_in_uri = 1;
state = sw_uri;
break;
case ' ':
/*
* use single "/" from request line to preserve pointers,
* if request line will be copied to large client buffer
*/
r->uri_start = r->schema_end + 1;
r->uri_end = r->schema_end + 2;
state = sw_http_09;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_host_ip_literal:
if (ch >= '0' && ch <= '9') {
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'z') {
break;
}
switch (ch) {
case ':':
break;
case ']':
state = sw_host_end;
break;
case '-':
case '.':
case '_':
case '~':
/* unreserved */
break;
case '!':
case '$':
case '&':
case '\'':
case '(':
case ')':
case '*':
case '+':
case ',':
case ';':
case '=':
/* sub-delims */
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_port:
if (ch >= '0' && ch <= '9') {
break;
}
switch (ch) {
case '/':
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
case '?':
r->uri_start = p;
r->args_start = p + 1;
r->empty_path_in_uri = 1;
state = sw_uri;
break;
case ' ':
/*
* use single "/" from request line to preserve pointers,
* if request line will be copied to large client buffer
*/
r->uri_start = r->schema_end + 1;
r->uri_end = r->schema_end + 2;
state = sw_http_09;
break;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
/* check "/.", "//", "%", and "\" (Win32) in URI */
case sw_after_slash_in_uri:
if (usual[ch >> 5] & (1U << (ch & 0x1f))) {
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->complex_uri = 1;
state = sw_uri;
break;
case '+':
r->plus_in_uri = 1;
break;
default:
if (ch < 0x20 || ch == 0x7f) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
state = sw_check_uri;
break;
}
break;
/* check "/", "%" and "\" (Win32) in URI */
case sw_check_uri:
if (usual[ch >> 5] & (1U << (ch & 0x1f))) {
break;
}
switch (ch) {
case '/':
#if (NGX_WIN32)
if (r->uri_ext == p) {
r->complex_uri = 1;
state = sw_uri;
break;
}
#endif
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->args_start = p + 1;
state = sw_uri;
break;
case '#':
r->complex_uri = 1;
state = sw_uri;
break;
case '+':
r->plus_in_uri = 1;
break;
default:
if (ch < 0x20 || ch == 0x7f) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
break;
}
break;
/* URI */
case sw_uri:
if (usual[ch >> 5] & (1U << (ch & 0x1f))) {
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;
break;
default:
if (ch < 0x20 || ch == 0x7f) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
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';
if (r->http_major > 1) {
return NGX_HTTP_PARSE_INVALID_VERSION;
}
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');
if (r->http_major > 1) {
return NGX_HTTP_PARSE_INVALID_VERSION;
}
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 == ' ') {
state = sw_spaces_after_digit;
break;
}
if (ch < '0' || ch > '9') {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
if (r->http_minor > 99) {
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
r->http_minor = r->http_minor * 10 + (ch - '0');
break;
case sw_spaces_after_digit:
switch (ch) {
case ' ':
break;
case CR:
state = sw_almost_done;
break;
case LF:
goto done;
default:
return NGX_HTTP_PARSE_INVALID_REQUEST;
}
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,
ngx_uint_t allow_underscores)
{
u_char c, ch, *p;
ngx_uint_t hash, i;
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;
/* the last '\0' is not needed because string is zero terminated */
static u_char lowcase[] =
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0-\0\0" "0123456789\0\0\0\0\0\0"
"\0abcdefghijklmnopqrstuvwxyz\0\0\0\0\0"
"\0abcdefghijklmnopqrstuvwxyz\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
state = r->state;
hash = r->header_hash;
i = r->lowcase_index;
for (p = b->pos; p < b->last; p++) {
ch = *p;
switch (state) {
/* first char */
case sw_start:
r->header_name_start = p;
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;
c = lowcase[ch];
if (c) {
hash = ngx_hash(0, c);
r->lowcase_header[0] = c;
i = 1;
break;
}
if (ch == '_') {
if (allow_underscores) {
hash = ngx_hash(0, ch);
r->lowcase_header[0] = ch;
i = 1;
} else {
hash = 0;
i = 0;
r->invalid_header = 1;
}
break;
}
if (ch <= 0x20 || ch == 0x7f || ch == ':') {
r->header_end = p;
return NGX_HTTP_PARSE_INVALID_HEADER;
}
hash = 0;
i = 0;
r->invalid_header = 1;
break;
}
break;
/* header name */
case sw_name:
c = lowcase[ch];
if (c) {
hash = ngx_hash(hash, c);
r->lowcase_header[i++] = c;
i &= (NGX_HTTP_LC_HEADER_LEN - 1);
break;
}
if (ch == '_') {
if (allow_underscores) {
hash = ngx_hash(hash, ch);
r->lowcase_header[i++] = ch;
i &= (NGX_HTTP_LC_HEADER_LEN - 1);
} else {
r->invalid_header = 1;
}
break;
}
if (ch == ':') {
r->header_name_end = p;
state = sw_space_before_value;
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;
}