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parser.c
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#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>
#include "internal.h"
#include "evhtp/parser.h"
#include "evhtp/config.h"
#include "log.h"
#if '\n' != '\x0a' || 'A' != 65
#error "You have somehow found a non-ASCII host. We can't build here."
#endif
#define PARSER_STACK_MAX 8192
#define LF (unsigned char)10
#define CR (unsigned char)13
#define CRLF "\x0d\x0a"
enum eval_hdr_val {
eval_hdr_val_none = 0,
eval_hdr_val_connection,
eval_hdr_val_proxy_connection,
eval_hdr_val_content_length,
eval_hdr_val_transfer_encoding,
eval_hdr_val_hostname,
eval_hdr_val_content_type
};
enum parser_flags {
parser_flag_chunked = (1 << 0),
parser_flag_connection_keep_alive = (1 << 1),
parser_flag_connection_close = (1 << 2),
parser_flag_trailing = (1 << 3),
};
enum parser_state {
s_start = 0,
s_method,
s_spaces_before_uri,
s_schema,
s_schema_slash,
s_schema_slash_slash,
s_host,
s_host_ipv6,
s_host_done,
s_port,
s_after_slash_in_uri,
s_check_uri,
s_uri,
s_http_09,
s_http_H,
s_http_HT,
s_http_HTT,
s_http_HTTP,
s_first_major_digit,
s_major_digit,
s_first_minor_digit,
s_minor_digit,
s_spaces_after_digit,
s_almost_done,
s_done,
s_hdrline_start,
s_hdrline_hdr_almost_done,
s_hdrline_hdr_done,
s_hdrline_hdr_key,
s_hdrline_hdr_space_before_val,
s_hdrline_hdr_val,
s_hdrline_almost_done,
s_hdrline_done,
s_body_read,
s_chunk_size_start,
s_chunk_size,
s_chunk_size_almost_done,
s_chunk_data,
s_chunk_data_almost_done,
s_chunk_data_done,
s_status,
s_space_after_status,
s_status_text
};
typedef enum eval_hdr_val eval_hdr_val;
typedef enum parser_flags parser_flags;
typedef enum parser_state parser_state;
struct htparser {
htpparse_error error;
parser_state state;
parser_flags flags;
eval_hdr_val heval;
htp_type type;
htp_scheme scheme;
htp_method method;
unsigned char multipart;
unsigned char major;
unsigned char minor;
uint64_t content_len; /* this gets decremented as data passes through */
uint64_t orig_content_len; /* this contains the original length of the body */
uint64_t bytes_read;
uint64_t total_bytes_read;
unsigned int status; /* only for responses */
unsigned int status_count; /* only for responses */
char * scheme_offset;
char * host_offset;
char * port_offset;
char * path_offset;
char * args_offset;
void * userdata;
size_t buf_idx;
/* Must be last since htparser_init memsets up to the offset of this buffer */
char buf[PARSER_STACK_MAX];
};
#ifdef EVHTP_DEBUG
static void
log_htparser__s_(struct htparser * p)
{
log_debug(
"struct htparser {\n"
" htpparse_error = %d\n"
" parser_state = %d\n"
" parser_flags = %d\n"
" eval_hdr_val = %d\n"
" htp_type = %d\n"
" htp_scheme = %d\n"
" htp_method = %d\n"
" multipart = %c\n"
" major = %c\n"
" minor = %c\n"
" content_len = %zu\n"
" orig_clen = %zu\n"
" bytes_read = %zu\n"
" total_read = %zu\n"
" status = %d\n"
" status_count = %d\n"
" scheme_offset = %s\n"
" host_offset = %s\n"
" port_offset = %s\n"
" path_offset = %s\n"
" args_offset = %s\n"
" userdata = %p\n"
" buf_idx = %zu\n"
" buf = %s\n"
"};",
p->error,
p->state,
p->flags,
p->heval,
p->type,
p->scheme,
p->method,
p->multipart,
p->major,
p->minor,
p->content_len,
p->orig_content_len,
p->bytes_read,
p->total_bytes_read,
p->status,
p->status_count,
p->scheme_offset,
p->host_offset,
p->port_offset,
p->path_offset,
p->args_offset,
p->userdata,
p->buf_idx,
p->buf);
} /* log_htparser__s_ */
#else
#define log_htparser__s_(p)
#endif
static uint32_t usual[] = {
0xffffdbfe,
0x7fff37d6,
0xffffffff,
0xffffffff,
0xffffffff,
0xffffffff,
0xffffffff,
0xffffffff
};
static int8_t unhex[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
static const char * errstr_map[] = {
"htparse_error_none",
"htparse_error_too_big",
"htparse_error_invalid_method",
"htparse_error_invalid_requestline",
"htparse_error_invalid_schema",
"htparse_error_invalid_protocol",
"htparse_error_invalid_version",
"htparse_error_invalid_header",
"htparse_error_invalid_chunk_size",
"htparse_error_invalid_chunk",
"htparse_error_invalid_state",
"htparse_error_user",
"htparse_error_unknown"
};
static const char * method_strmap[] = {
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"MKCOL",
"COPY",
"MOVE",
"OPTIONS",
"PROPFIND",
"PROPATCH",
"LOCK",
"UNLOCK",
"TRACE",
"CONNECT",
"PATCH",
};
#define _MIN_READ(a, b) ((a) < (b) ? (a) : (b))
#ifndef HOST_BIG_ENDIAN
/* Little-endian cmp macros */
#define _str3_cmp(m, c0, c1, c2, c3) \
*(uint32_t *)m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0)
#define _str3Ocmp(m, c0, c1, c2, c3) \
*(uint32_t *)m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0)
#define _str4cmp(m, c0, c1, c2, c3) \
*(uint32_t *)m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0)
#define _str5cmp(m, c0, c1, c2, c3, c4) \
*(uint32_t *)m == ((c3 << 24) | (c2 << 16) | (c1 << 8) | c0) \
&& m[4] == c4
#define _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 _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 _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 _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
/* Big endian cmp macros */
#define _str3_cmp(m, c0, c1, c2, c3) \
m[0] == c0 && m[1] == c1 && m[2] == c2
#define _str3Ocmp(m, c0, c1, c2, c3) \
m[0] == c0 && m[2] == c2 && m[3] == c3
#define _str4cmp(m, c0, c1, c2, c3) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3
#define _str5cmp(m, c0, c1, c2, c3, c4) \
m[0] == c0 && m[1] == c1 && m[2] == c2 && m[3] == c3 && m[4] == c4
#define _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 _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 _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 _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
#define __HTPARSE_GENHOOK(__n) \
static inline int hook_ ## __n ## _run(htparser * p, htparse_hooks * hooks) { \
log_debug("enter"); \
if (hooks && (hooks)->__n) \
{ \
return (hooks)->__n(p); \
} \
\
return 0; \
}
#define __HTPARSE_GENDHOOK(__n) \
static inline int hook_ ## __n ## _run(htparser * p, \
htparse_hooks * hooks, \
const char * s, size_t l) { \
log_debug("enter"); \
if (hooks && (hooks)->__n) \
{ \
return (hooks)->__n(p, s, l); \
} \
\
return 0; \
}
__HTPARSE_GENHOOK(on_msg_begin)
__HTPARSE_GENHOOK(on_hdrs_begin)
__HTPARSE_GENHOOK(on_hdrs_complete)
__HTPARSE_GENHOOK(on_new_chunk)
__HTPARSE_GENHOOK(on_chunk_complete)
__HTPARSE_GENHOOK(on_chunks_complete)
__HTPARSE_GENHOOK(on_msg_complete)
__HTPARSE_GENDHOOK(method)
__HTPARSE_GENDHOOK(scheme)
__HTPARSE_GENDHOOK(host)
__HTPARSE_GENDHOOK(port)
__HTPARSE_GENDHOOK(path)
__HTPARSE_GENDHOOK(args)
__HTPARSE_GENDHOOK(uri)
__HTPARSE_GENDHOOK(hdr_key)
__HTPARSE_GENDHOOK(hdr_val)
__HTPARSE_GENDHOOK(body)
__HTPARSE_GENDHOOK(hostname)
static inline uint64_t
str_to_uint64(char * str, size_t n, int * err)
{
uint64_t value;
/* Trim whitespace after value. */
while (n && isblank(str[n - 1]))
{
n--;
}
if (n > 20)
{
/* 18446744073709551615 is 20 bytes */
*err = 1;
return 0;
}
for (value = 0; n--; str++)
{
uint64_t check;
if (*str < '0' || *str > '9')
{
*err = 1;
return 0;
}
check = value * 10 + (*str - '0');
if ((value && check <= value))
{
*err = 1;
return 0;
}
value = check;
}
return value;
}
static inline ssize_t
_str_to_ssize_t(char * str, size_t n)
{
ssize_t value;
if (n == 0)
{
return -1;
}
for (value = 0; n--; str++)
{
if (*str < '0' || *str > '9')
{
return -1;
}
value = value * 10 + (*str - '0');
#if 0
if (value > INTMAX_MAX)
{
return -1;
}
#endif
}
return value;
}
htpparse_error
htparser_get_error(htparser * p)
{
return p->error;
}
const char *
htparser_get_strerror(htparser * p)
{
htpparse_error e = htparser_get_error(p);
if (e > (htparse_error_generic + 1))
{
return "htparse_no_such_error";
}
return errstr_map[e];
}
unsigned int
htparser_get_status(htparser * p)
{
return p->status;
}
int
htparser_should_keep_alive(htparser * p)
{
if (p->major > 0 && p->minor > 0)
{
if (p->flags & parser_flag_connection_close)
{
return 0;
} else {
return 1;
}
} else {
if (p->flags & parser_flag_connection_keep_alive)
{
return 1;
} else {
return 0;
}
}
return 0;
}
htp_scheme
htparser_get_scheme(htparser * p)
{
return p->scheme;
}
htp_method
htparser_get_method(htparser * p)
{
return p->method;
}
const char *
htparser_get_methodstr_m(htp_method meth)
{
if (meth >= htp_method_UNKNOWN)
{
return NULL;
}
return method_strmap[meth];
}
const char *
htparser_get_methodstr(htparser * p)
{
return htparser_get_methodstr_m(p->method);
}
void
htparser_set_major(htparser * p, unsigned char major)
{
p->major = major;
}
void
htparser_set_minor(htparser * p, unsigned char minor)
{
p->minor = minor;
}
unsigned char
htparser_get_major(htparser * p)
{
return p->major;
}
unsigned char
htparser_get_minor(htparser * p)
{
return p->minor;
}
unsigned char
htparser_get_multipart(htparser * p)
{
return p->multipart;
}
void *
htparser_get_userdata(htparser * p)
{
return p->userdata;
}
void
htparser_set_userdata(htparser * p, void * ud)
{
p->userdata = ud;
}
uint64_t
htparser_get_content_pending(htparser * p)
{
return p->content_len;
}
uint64_t
htparser_get_content_length(htparser * p)
{
return p->orig_content_len;
}
uint64_t
htparser_get_bytes_read(htparser * p)
{
return p->bytes_read;
}
uint64_t
htparser_get_total_bytes_read(htparser * p)
{
return p->total_bytes_read;
}
void
htparser_init(htparser * p, htp_type type)
{
/* Do not memset entire string buffer. */
memset(p, 0, offsetof(htparser, buf));
p->buf[0] = '\0';
p->state = s_start;
p->error = htparse_error_none;
p->method = htp_method_UNKNOWN;
p->type = type;
}
htparser *
htparser_new(void)
{
return malloc(sizeof(htparser));
}
static int
is_host_char(unsigned char ch)
{
char c = (unsigned char)(ch | 0x20);
if (c >= 'a' && c <= 'z')
{
return 1;
}
if ((ch >= '0' && ch <= '9') || ch == '.' || ch == '-')
{
return 1;
}
return 0;
}
static htp_method
get_method(const char * m, const size_t sz)
{
switch (sz) {
case 3:
if (_str3_cmp(m, 'G', 'E', 'T', '\0'))
{
return htp_method_GET;
}
if (_str3_cmp(m, 'P', 'U', 'T', '\0'))
{
return htp_method_PUT;
}
break;
case 4:
if (m[1] == 'O')
{
if (_str3Ocmp(m, 'P', 'O', 'S', 'T'))
{
return htp_method_POST;
}
if (_str3Ocmp(m, 'C', 'O', 'P', 'Y'))
{
return htp_method_COPY;
}
if (_str3Ocmp(m, 'M', 'O', 'V', 'E'))
{
return htp_method_MOVE;
}
if (_str3Ocmp(m, 'L', 'O', 'C', 'K'))
{
return htp_method_LOCK;
}
} else {
if (_str4cmp(m, 'H', 'E', 'A', 'D'))
{
return htp_method_HEAD;
}
}
break;
case 5:
if (_str5cmp(m, 'M', 'K', 'C', 'O', 'L'))
{
return htp_method_MKCOL;
}
if (_str5cmp(m, 'T', 'R', 'A', 'C', 'E'))
{
return htp_method_TRACE;
}
if (_str5cmp(m, 'P', 'A', 'T', 'C', 'H'))
{
return htp_method_PATCH;
}
break;
case 6:
if (_str6cmp(m, 'D', 'E', 'L', 'E', 'T', 'E'))
{
return htp_method_DELETE;
}
if (_str6cmp(m, 'U', 'N', 'L', 'O', 'C', 'K'))
{
return htp_method_UNLOCK;
}
break;
case 7:
if (_str7_cmp(m, 'O', 'P', 'T', 'I', 'O', 'N', 'S', '\0'))
{
return htp_method_OPTIONS;
}
if (_str7_cmp(m, 'C', 'O', 'N', 'N', 'E', 'C', 'T', '\0'))
{
return htp_method_CONNECT;
}
break;
case 8:
if (_str8cmp(m, 'P', 'R', 'O', 'P', 'F', 'I', 'N', 'D'))
{
return htp_method_PROPFIND;
}
break;
case 9:
if (_str9cmp(m, 'P', 'R', 'O', 'P', 'P', 'A', 'T', 'C', 'H'))
{
return htp_method_PROPPATCH;
}
break;
} /* switch */
return htp_method_UNKNOWN;
} /* get_method */
size_t
htparser_run(htparser * p, htparse_hooks * hooks, const char * data, size_t len)
{
unsigned char ch;
char c;
size_t i;
log_debug("enter");
log_debug("p == %p", p);
p->error = htparse_error_none;
p->bytes_read = 0;
for (i = 0; i < len; i++)
{
int res;
int err;
ch = data[i];
log_debug("[%p] data[%zu] = %c (%x)", p, i, isprint(ch) ? ch : ' ', ch);
if (p->buf_idx >= PARSER_STACK_MAX)
{
p->error = htparse_error_too_big;
return i + 1;
}
p->total_bytes_read += 1;
p->bytes_read += 1;
switch (p->state) {
case s_start:
log_debug("[%p] s_start", p);
if (ch == CR || ch == LF)
{
break;
}
if ((ch < 'A' || ch > 'Z') && ch != '_')
{
p->error = htparse_error_inval_reqline;
log_debug("s_start invalid fist char '%c'", ch);
log_htparser__s_(p);
return i + 1;
}
p->flags = 0;
p->error = htparse_error_none;
p->method = htp_method_UNKNOWN;
p->multipart = 0;
p->major = 0;
p->minor = 0;
p->content_len = 0;
p->orig_content_len = 0;
p->status = 0;
p->status_count = 0;
p->scheme_offset = NULL;
p->host_offset = NULL;
p->port_offset = NULL;
p->path_offset = NULL;
p->args_offset = NULL;
res = hook_on_msg_begin_run(p, hooks);
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
if (evhtp_likely(p->type == htp_type_request))
{
p->state = s_method;
} else if (p->type == htp_type_response && ch == 'H')
{
p->state = s_http_H;
} else {
log_debug("not type of request or response?");
log_htparser__s_(p);
p->error = htparse_error_inval_reqline;
return i + 1;
}
if (res)
{
p->error = htparse_error_user;
return i + 1;
}
break;
case s_method:
log_debug("[%p] s_method", p);
do {
if (ch == ' ')
{
p->method = get_method(p->buf, p->buf_idx);
res = hook_method_run(p, hooks, p->buf, p->buf_idx);
p->buf_idx = 0;
p->state = s_spaces_before_uri;
if (res)
{
p->error = htparse_error_user;
return i + 1;
}
break;
} else {
if ((ch < 'A' || ch > 'Z') && ch != '_')
{
p->error = htparse_error_inval_method;
return i + 1;
}
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
}
ch = data[++i];
} while (i < len);
break;
case s_spaces_before_uri:
log_debug("[%p] s_spaces_before_uri", p);
/* CONNECT is special - RFC 2817 section 5.2:
* The Request-URI portion of the Request-Line is
* always an 'authority' as defined by URI Generic
* Syntax [2], which is to say the host name and port
* number destination of the requested connection
* separated by a colon
*/
if (p->method == htp_method_CONNECT)
{
switch (ch) {
case ' ':
break;
case '[':
/* Literal IPv6 address start. */
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->host_offset = &p->buf[p->buf_idx];
p->state = s_host_ipv6;
break;
default:
if (!is_host_char(ch))
{
p->error = htparse_error_inval_reqline;
log_htparser__s_(p);
return i + 1;
}
p->host_offset = &p->buf[p->buf_idx];
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->state = s_host;
break;
} /* switch */
break;
}
switch (ch) {
case ' ':
break;
case '/':
p->path_offset = &p->buf[p->buf_idx];
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->state = s_after_slash_in_uri;
break;
default:
c = (unsigned char)(ch | 0x20);
if (c >= 'a' && c <= 'z')
{
p->scheme_offset = &p->buf[p->buf_idx];
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->state = s_schema;
break;
}
p->error = htparse_error_inval_reqline;
log_htparser__s_(p);
return i + 1;
} /* switch */
break;
case s_schema:
log_debug("[%p] s_schema", p);
c = (unsigned char)(ch | 0x20);
if (c >= 'a' && c <= 'z')
{
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
break;
}
switch (ch) {
case ':':
p->scheme = htp_scheme_unknown;
switch (p->buf_idx) {
case 3:
if (_str3_cmp(p->scheme_offset, 'f', 't', 'p', '\0'))
{
p->scheme = htp_scheme_ftp;
break;
}
if (_str3_cmp(p->scheme_offset, 'n', 'f', 's', '\0'))
{
p->scheme = htp_scheme_nfs;
break;
}
break;
case 4:
if (_str4cmp(p->scheme_offset, 'h', 't', 't', 'p'))
{
p->scheme = htp_scheme_http;
break;
}
break;
case 5:
if (_str5cmp(p->scheme_offset, 'h', 't', 't', 'p', 's'))
{
p->scheme = htp_scheme_https;
break;
}
break;
} /* switch */
res = hook_scheme_run(p, hooks,
p->scheme_offset,
(&p->buf[p->buf_idx] - p->scheme_offset));
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->state = s_schema_slash;
if (res)
{
p->error = htparse_error_user;
return i + 1;
}
break;
default:
p->error = htparse_error_inval_schema;
return i + 1;
} /* switch */
break;
case s_schema_slash:
log_debug("[%p] s_schema_slash", p);
switch (ch) {
case '/':
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->state = s_schema_slash_slash;
break;
default:
p->error = htparse_error_inval_schema;
return i + 1;
}
break;
case s_schema_slash_slash:
log_debug("[%p] s_schema_slash_slash", p);
switch (ch) {
case '/':
p->buf[p->buf_idx++] = ch;
p->buf[p->buf_idx] = '\0';
p->host_offset = &p->buf[p->buf_idx];
p->state = s_host;
break;