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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_http_proxy_handler.h>
int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p)
{
u_char ch;
u_char *pos;
enum {
sw_start = 0,
sw_H,
sw_HT,
sw_HTT,
sw_HTTP,
sw_first_major_digit,
sw_major_digit,
sw_first_minor_digit,
sw_minor_digit,
sw_status,
sw_space_after_status,
sw_status_text,
sw_almost_done,
sw_done
} state;
state = p->parse_state;
pos = p->header_in->pos;
while (pos < p->header_in->last && state < sw_done) {
ch = *pos++;
switch (state) {
/* "HTTP/" */
case sw_start:
switch (ch) {
case 'H':
state = sw_H;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
case sw_H:
switch (ch) {
case 'T':
state = sw_HT;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
case sw_HT:
switch (ch) {
case 'T':
state = sw_HTT;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
case sw_HTT:
switch (ch) {
case 'P':
state = sw_HTTP;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
case sw_HTTP:
switch (ch) {
case '/':
state = sw_first_major_digit;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
/* the first digit of major HTTP version */
case sw_first_major_digit:
if (ch < '1' || ch > '9') {
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
state = sw_major_digit;
break;
/* the 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_PROXY_PARSE_NO_HEADER;
}
break;
/* the first digit of minor HTTP version */
case sw_first_minor_digit:
if (ch < '0' || ch > '9') {
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
state = sw_minor_digit;
break;
/* the minor HTTP version or the end of the request line */
case sw_minor_digit:
if (ch == ' ') {
state = sw_status;
break;
}
if (ch < '0' || ch > '9') {
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
/* HTTP status code */
case sw_status:
if (ch < '0' || ch > '9') {
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
p->status = p->status * 10 + ch - '0';
if (++p->status_count == 3) {
state = sw_space_after_status;
p->status_start = pos - 3;
}
break;
/* space or end of line */
case sw_space_after_status:
switch (ch) {
case ' ':
state = sw_status_text;
break;
case CR:
state = sw_almost_done;
break;
case LF:
state = sw_done;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
/* any text until end of line */
case sw_status_text:
switch (ch) {
case CR:
state = sw_almost_done;
break;
case LF:
state = sw_done;
break;
}
break;
/* end of request line */
case sw_almost_done:
p->status_end = pos - 2;
switch (ch) {
case LF:
state = sw_done;
break;
default:
return NGX_HTTP_PROXY_PARSE_NO_HEADER;
}
break;
/* suppress warning */
case sw_done:
break;
}
}
p->header_in->pos = pos;
if (state == sw_done) {
if (p->status_end == NULL) {
p->status_end = pos - 1;
}
p->parse_state = sw_start;
return NGX_OK;
}
p->parse_state = state;
return NGX_AGAIN;
}
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