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http_parse.cpp
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http_parse.cpp
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#include "http_request.h"
#include "http_parse.h"
#include "hz_error.h"
#include <errno.h>
#include <fstream>
#include "memory_pool.h"
extern allocator hz_alloc;
extern std::fstream log_file;
int http_parse_request_line(http_request *r) {
u_char ch, *p, *m;
size_t pi;
enum http_state{
sw_start = 0,
sw_method,
sw_spaces_before_uri,
sw_after_slash_in_uri,
sw_http,
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;
state = (http_state)r->state;
for (pi = r->pos; pi < r->last; pi++)
{
p = (u_char *)&r->buf[pi % MAX_BUF];
ch = *p;
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') && ch != '_')
{
return HTTP_PARSE_INVALID_METHOD;
}
state = sw_method;
break;
case sw_method:
if (ch == ' ')
{
r->method_end = p;
m = (u_char*)(r->request_start);
switch (p - m)
{
case 3:
if (str3_cmp(m, 'G', 'E', 'T', ' '))
{
r->method = HTTP_GET;
break;
}
break;
case 4:
if (str3_cmp(m, 'P', 'O', 'S', 'T'))
{
r->method = HTTP_POST;
break;
}
if (str3_cmp(m, 'H', 'E', 'A', 'D'))
{
r->method = HTTP_HEAD;
break;
}
break;
default:
r->method = HTTP_UNKNOWN;
break;
}
state = sw_spaces_before_uri;
break;
}
if ((ch < 'A' || ch > 'Z') && ch != '_')
{
return HTTP_PARSE_INVALID_METHOD;
}
break;
/* space* before URI */
case sw_spaces_before_uri:
if (ch == '/')
{
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
}
switch (ch)
{
case ' ':
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_after_slash_in_uri:
switch (ch)
{
case ' ':
r->uri_end = p;
state = sw_http;
break;
default:
break;
}
break;
/* space+ after URI */
case sw_http:
switch (ch)
{
case ' ':
break;
case 'H':
state = sw_http_H;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_H:
switch (ch)
{
case 'T':
state = sw_http_HT;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HT:
switch (ch)
{
case 'T':
state = sw_http_HTT;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HTT:
switch (ch)
{
case 'P':
state = sw_http_HTTP;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HTTP:
switch (ch)
{
case '/':
state = sw_first_major_digit;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
/* first digit of major HTTP version */
case sw_first_major_digit:
if (ch < '1' || ch > '9')
{
return 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 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 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 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 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 HTTP_PARSE_INVALID_REQUEST;
}
}
}
r->pos = pi;
r->state = (int)state;
return EAGAIN;
done:
r->pos = pi + 1;
if (r->request_end == NULL)
{
r->request_end = p;
}
r->state = sw_start;
return SUCCESS;
}
int http_parse_request_body(http_request *r)
{
u_char ch, *p;
size_t pi;
enum parse_state{
sw_start = 0,
sw_key,
sw_spaces_before_colon,
sw_spaces_after_colon,
sw_value,
sw_cr,
sw_crlf,
sw_crlfcr
} state;
state = (parse_state)r->state;
http_heads *hd;
for (pi = r->pos; pi < r->last; pi++)
{
p = (u_char *)&r->buf[pi % MAX_BUF];
ch = *p;
switch (state)
{
case sw_start:
if (ch == CR || ch == LF)
{
break;
}
r->head_key_start = p;
state = sw_key;
break;
case sw_key:
if (ch == ' ')
{
r->head_key_end = p;
state = sw_spaces_before_colon;
break;
}
if (ch == ':') {
r->head_key_end = p;
state = sw_spaces_after_colon;
break;
}
break;
case sw_spaces_before_colon:
if (ch == ' ')
{
break;
} else if (ch == ':')
{
state = sw_spaces_after_colon;
break;
} else
{
return HTTP_PARSE_INVALID_HEADER;
}
case sw_spaces_after_colon:
if (ch == ' ')
{
break;
}
state = sw_value;
r->head_value_start = p;
break;
case sw_value:
if (ch == CR)
{
r->head_value_end = p;
state = sw_cr;
}
if (ch == LF)
{
r->head_value_end = p;
state = sw_crlf;
}
break;
case sw_cr:
if (ch == LF)
{
state = sw_crlf;
hd = (http_heads *)hz_alloc.mem_palloc(sizeof(http_heads));
hd->key_start = r->head_key_start;
hd->key_end = r->head_key_end;
hd->value_start = r->head_value_start;
hd->value_end = r->head_value_end;
list_add(&(hd->list), &(r->list));
break;
} else
{
return HTTP_PARSE_INVALID_HEADER;
}
case sw_crlf:
if (ch == CR)
{
state = sw_crlfcr;
} else
{
r->head_key_start = p;
state = sw_key;
}
break;
case sw_crlfcr:
switch (ch)
{
case LF:
goto done;
default:
return HTTP_PARSE_INVALID_HEADER;
}
break;
}
}
r->pos = pi;
r->state = (int)state;
return EAGAIN;
done:
r->pos = pi + 1;
r->state = sw_start;
return SUCCESS;
}