lighttpd 1.4.x https://www.lighttpd.net/
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/*
* http_header - HTTP header manipulation interfaces
*
* Copyright(c) 2018 Glenn Strauss gstrauss()gluelogic.com All rights reserved
* License: BSD 3-clause (same as lighttpd)
*/
#include "first.h"
#include <string.h>
#include "sys-strings.h"
#include "http_header.h"
#include "base.h"
#include "array.h"
#include "buffer.h"
typedef struct keyvlenvalue {
const int16_t key;
const uint16_t vlen;
const char value[28];
} keyvlenvalue;
/* Note: must be sorted by length */
/* Note: must be kept in sync with http_header.h enum http_header_e */
/* Note: must be kept in sync http_headers[] and http_headers_off[] */
/* Note: must be kept in sync h2.c:http_header_lc[] */
/* Note: must be kept in sync h2.c:http_header_lshpack_idx[] */
/* Note: must be kept in sync h2.c:lshpack_idx_http_header[] */
/* http_headers_off lists first offset at which string of specific len occur */
static const int8_t http_headers_off[] = {
-1, -1, 0, 1, 4, 9, 11, 17, 21, 25, 27, -1, 30, 31,
37, 40, 45, 49, -1, 52, -1, -1, 53, 54, -1, 55, -1, 57
};
static const keyvlenvalue http_headers[] = {
{ HTTP_HEADER_TE, CONST_LEN_STR("te") }
,{ HTTP_HEADER_AGE, CONST_LEN_STR("age") }
,{ HTTP_HEADER_DNT, CONST_LEN_STR("dnt") }
,{ HTTP_HEADER_P3P, CONST_LEN_STR("p3p") }
,{ HTTP_HEADER_HOST, CONST_LEN_STR("host") }
,{ HTTP_HEADER_DATE, CONST_LEN_STR("date") }
,{ HTTP_HEADER_ETAG, CONST_LEN_STR("etag") }
,{ HTTP_HEADER_VARY, CONST_LEN_STR("vary") }
,{ HTTP_HEADER_LINK, CONST_LEN_STR("link") }
,{ HTTP_HEADER_ALLOW, CONST_LEN_STR("allow") }
,{ HTTP_HEADER_RANGE, CONST_LEN_STR("range") }
,{ HTTP_HEADER_COOKIE, CONST_LEN_STR("cookie") }
,{ HTTP_HEADER_ACCEPT, CONST_LEN_STR("accept") }
,{ HTTP_HEADER_STATUS, CONST_LEN_STR("status") }
,{ HTTP_HEADER_SERVER, CONST_LEN_STR("server") }
,{ HTTP_HEADER_EXPECT, CONST_LEN_STR("expect") }
,{ HTTP_HEADER_PRAGMA, CONST_LEN_STR("pragma") }
,{ HTTP_HEADER_UPGRADE, CONST_LEN_STR("upgrade") }
,{ HTTP_HEADER_REFERER, CONST_LEN_STR("referer") }
,{ HTTP_HEADER_EXPIRES, CONST_LEN_STR("expires") }
,{ HTTP_HEADER_ALT_SVC, CONST_LEN_STR("alt-svc") }
,{ HTTP_HEADER_LOCATION, CONST_LEN_STR("location") }
,{ HTTP_HEADER_IF_MATCH, CONST_LEN_STR("if-match") }
,{ HTTP_HEADER_IF_RANGE, CONST_LEN_STR("if-range") }
,{ HTTP_HEADER_ALT_USED, CONST_LEN_STR("alt-used") }
,{ HTTP_HEADER_FORWARDED, CONST_LEN_STR("forwarded") }
,{ HTTP_HEADER_EXPECT_CT, CONST_LEN_STR("expect-ct") }
,{ HTTP_HEADER_CONNECTION, CONST_LEN_STR("connection") }
,{ HTTP_HEADER_SET_COOKIE, CONST_LEN_STR("set-cookie") }
,{ HTTP_HEADER_USER_AGENT, CONST_LEN_STR("user-agent") }
,{ HTTP_HEADER_CONTENT_TYPE, CONST_LEN_STR("content-type") }
,{ HTTP_HEADER_LAST_MODIFIED, CONST_LEN_STR("last-modified") }
,{ HTTP_HEADER_AUTHORIZATION, CONST_LEN_STR("authorization") }
,{ HTTP_HEADER_IF_NONE_MATCH, CONST_LEN_STR("if-none-match") }
,{ HTTP_HEADER_CACHE_CONTROL, CONST_LEN_STR("cache-control") }
,{ HTTP_HEADER_ACCEPT_RANGES, CONST_LEN_STR("accept-ranges") }
,{ HTTP_HEADER_CONTENT_RANGE, CONST_LEN_STR("content-range") }
,{ HTTP_HEADER_CONTENT_LENGTH, CONST_LEN_STR("content-length") }
,{ HTTP_HEADER_HTTP2_SETTINGS, CONST_LEN_STR("http2-settings") }
,{ HTTP_HEADER_ONION_LOCATION, CONST_LEN_STR("onion-location") }
,{ HTTP_HEADER_ACCEPT_ENCODING, CONST_LEN_STR("accept-encoding") }
,{ HTTP_HEADER_ACCEPT_LANGUAGE, CONST_LEN_STR("accept-language") }
,{ HTTP_HEADER_REFERRER_POLICY, CONST_LEN_STR("referrer-policy") }
,{ HTTP_HEADER_X_FORWARDED_FOR, CONST_LEN_STR("x-forwarded-for") }
,{ HTTP_HEADER_X_FRAME_OPTIONS, CONST_LEN_STR("x-frame-options") }
,{ HTTP_HEADER_WWW_AUTHENTICATE, CONST_LEN_STR("www-authenticate") }
,{ HTTP_HEADER_CONTENT_ENCODING, CONST_LEN_STR("content-encoding") }
,{ HTTP_HEADER_CONTENT_LOCATION, CONST_LEN_STR("content-location") }
,{ HTTP_HEADER_X_XSS_PROTECTION, CONST_LEN_STR("x-xss-protection") }
,{ HTTP_HEADER_IF_MODIFIED_SINCE, CONST_LEN_STR("if-modified-since") }
,{ HTTP_HEADER_TRANSFER_ENCODING, CONST_LEN_STR("transfer-encoding") }
,{ HTTP_HEADER_X_FORWARDED_PROTO, CONST_LEN_STR("x-forwarded-proto") }
,{ HTTP_HEADER_IF_UNMODIFIED_SINCE, CONST_LEN_STR("if-unmodified-since") }
,{ HTTP_HEADER_X_CONTENT_TYPE_OPTIONS, CONST_LEN_STR("x-content-type-options") }
,{ HTTP_HEADER_CONTENT_SECURITY_POLICY, CONST_LEN_STR("content-security-policy") }
,{ HTTP_HEADER_STRICT_TRANSPORT_SECURITY, CONST_LEN_STR("strict-transport-security") }
,{ HTTP_HEADER_UPGRADE_INSECURE_REQUESTS, CONST_LEN_STR("upgrade-insecure-requests") }
,{ HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN, CONST_LEN_STR("access-control-allow-origin") }
,{ HTTP_HEADER_OTHER, 0, "" }
};
enum http_header_e http_header_hkey_get(const char * const s, const uint32_t slen) {
const struct keyvlenvalue * const kv = http_headers;
int i = slen < sizeof(http_headers_off) ? http_headers_off[slen] : -1;
if (i < 0) return HTTP_HEADER_OTHER;
do {
if (buffer_eq_icase_ssn(s, kv[i].value, slen))
return (enum http_header_e)kv[i].key;
} while (slen == kv[++i].vlen);
return HTTP_HEADER_OTHER;
}
enum http_header_e http_header_hkey_get_lc(const char * const s, const uint32_t slen) {
const struct keyvlenvalue * const kv = http_headers;
int i = slen < sizeof(http_headers_off) ? http_headers_off[slen] : -1;
if (i < 0) return HTTP_HEADER_OTHER;
do {
if (0 == memcmp(s, kv[i].value, slen))
return (enum http_header_e)kv[i].key;
} while (slen == kv[++i].vlen);
return HTTP_HEADER_OTHER;
}
int http_header_str_to_code (const char * const s)
{
/*(more strict than strtol(); exactly 3 digits followed by SP/TAB/NIL)*/
return (light_isdigit(s[0]) && light_isdigit(s[1]) && light_isdigit(s[2])
&& (s[3] == '\0' || s[3] == ' ' || s[3] == '\t'))
? (s[0]-'0')*100 + (s[1]-'0')*10 + (s[2]-'0')
: -1;
}
int http_header_str_contains_token (const char * const s, const uint32_t slen, const char * const m, const uint32_t mlen)
{
/*if (slen < mlen) return 0;*//*(possible optimizations for caller)*/
/*if (slen == mlen && buffer_eq_icase_ssn(s, m, mlen)) return 1;*/
/*(note: does not handle quoted-string)*/
uint32_t i = 0;
do {
while (i < slen && (s[i]==' ' || s[i]=='\t' || s[i]==',')) ++i;
if (slen - i < mlen) return 0;
if (buffer_eq_icase_ssn(s+i, m, mlen)) {
i += mlen;
if (i == slen || s[i]==' ' || s[i]=='\t' || s[i]==',' || s[i]==';')
return 1;
}
while (i < slen && s[i]!=',') ++i;
} while (i < slen);
return 0;
}
int http_header_remove_token (buffer * const b, const char * const m, const uint32_t mlen)
{
/*(remove all instance of token from string)*/
/*(note: does not handle quoted-string)*/
int rc = 0;
for (char *s = b->ptr; s; ) {
while (*s == ' ' || *s == '\t' || *s == ',') ++s;
if (0 == strncasecmp(s, m, mlen)) {
s += mlen;
if (*s=='\0' || *s==' ' || *s=='\t' || *s==',' || *s==';') {
memset(s-mlen, ' ', mlen);
while (*s != '\0' && *s != ',') ++s;
rc = 1;
if (*s == ',') {
*s++ = ' ';
continue;
}
else {
for (s -= mlen; *s != ',' && s != b->ptr; --s) ;
buffer_string_set_length(b, (size_t)(s - b->ptr));
break;
}
}
}
s = strchr(s, ',');
}
return rc;
}
static inline void http_header_token_append(buffer * const vb, const char * const v, const uint32_t vlen) {
if (!buffer_string_is_empty(vb))
buffer_append_string_len(vb, CONST_STR_LEN(", "));
buffer_append_string_len(vb, v, vlen);
}
__attribute_cold__
static inline void http_header_token_append_cookie(buffer * const vb, const char * const v, const uint32_t vlen) {
/* Cookie request header must be special-cased to use ';' separator
* instead of ',' to combine multiple headers (if present) */
if (!buffer_string_is_empty(vb))
buffer_append_string_len(vb, CONST_STR_LEN("; "));
buffer_append_string_len(vb, v, vlen);
}
__attribute_pure__
static inline buffer * http_header_generic_get_ifnotempty(const array * const a, const enum http_header_e id, const char * const k, const uint32_t klen) {
data_string * const ds =
(data_string *)array_get_element_klen_ext(a, id, k, klen);
return ds && !buffer_string_is_empty(&ds->value) ? &ds->value : NULL;
}
static inline void http_header_set_key_value(array * const a, enum http_header_e id, const char * const k, const size_t klen, const char * const v, const size_t vlen) {
buffer_copy_string_len(array_get_buf_ptr_ext(a, id, k, klen), v, vlen);
}
buffer * http_header_response_get(const request_st * const r, enum http_header_e id, const char *k, uint32_t klen) {
return light_btst(r->resp_htags, id)
? http_header_generic_get_ifnotempty(&r->resp_headers, id, k, klen)
: NULL;
}
void http_header_response_unset(request_st * const r, enum http_header_e id, const char *k, uint32_t klen) {
if (light_btst(r->resp_htags, id)) {
/* (do not clear bit for HTTP_HEADER_OTHER,
* as there might be addtl "other" headers) */
if (id > HTTP_HEADER_OTHER) light_bclr(r->resp_htags, id);
http_header_set_key_value(&r->resp_headers,id,k,klen,CONST_STR_LEN(""));
}
}
void http_header_response_set(request_st * const r, enum http_header_e id, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
/* set value, including setting blank value if 0 == vlen
* (note: if 0 == vlen, header is still inserted with blank value,
* which is used to indicate a "removed" header)
* (do not clear bit for HTTP_HEADER_OTHER if 0 == vlen,
* as there might be addtl "other" headers) */
(vlen)
? light_bset(r->resp_htags, id)
: (id > HTTP_HEADER_OTHER ? light_bclr(r->resp_htags, id) : 0);
http_header_set_key_value(&r->resp_headers, id, k, klen, v, vlen);
}
void http_header_response_append(request_st * const r, enum http_header_e id, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
if (0 == vlen) return;
light_bset(r->resp_htags, id);
buffer * const vb = array_get_buf_ptr_ext(&r->resp_headers, id, k, klen);
http_header_token_append(vb, v, vlen);
}
__attribute_cold__
static void http_header_response_insert_addtl(request_st * const r, enum http_header_e id, const char *k, uint32_t klen, buffer * const vb, uint32_t vlen) {
UNUSED(id);
buffer_append_string_len(vb, CONST_STR_LEN("\r\n"));
if (r->http_version >= HTTP_VERSION_2) {
r->resp_header_repeated = 1;
char * const h = buffer_string_prepare_append(vb, klen + vlen + 2);
for (uint32_t i = 0; i < klen; ++i)
h[i] = !light_isupper(k[i]) ? k[i] : (k[i] | 0x20);
buffer_commit(vb, klen);
}
else
buffer_append_string_len(vb, k, klen);
buffer_append_string_len(vb, CONST_STR_LEN(": "));
}
void http_header_response_insert(request_st * const r, enum http_header_e id, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
if (0 == vlen) return;
light_bset(r->resp_htags, id);
buffer * const vb = array_get_buf_ptr_ext(&r->resp_headers, id, k, klen);
if (!buffer_string_is_empty(vb)) /*append repeated field-name on new line*/
http_header_response_insert_addtl(r, id, k, klen, vb, vlen);
buffer_append_string_len(vb, v, vlen);
}
buffer * http_header_request_get(const request_st * const r, enum http_header_e id, const char *k, uint32_t klen) {
return light_btst(r->rqst_htags, id)
? http_header_generic_get_ifnotempty(&r->rqst_headers, id, k, klen)
: NULL;
}
void http_header_request_unset(request_st * const r, enum http_header_e id, const char *k, uint32_t klen) {
if (light_btst(r->rqst_htags, id)) {
/* (do not clear bit for HTTP_HEADER_OTHER,
* as there might be addtl "other" headers) */
if (id > HTTP_HEADER_OTHER) light_bclr(r->rqst_htags, id);
http_header_set_key_value(&r->rqst_headers,id,k,klen,CONST_STR_LEN(""));
}
}
void http_header_request_set(request_st * const r, enum http_header_e id, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
/* set value, including setting blank value if 0 == vlen
* (note: if 0 == vlen, header is still inserted with blank value,
* which is used to indicate a "removed" header)
* (do not clear bit for HTTP_HEADER_OTHER if 0 == vlen,
* as there might be addtl "other" headers) */
(vlen)
? light_bset(r->rqst_htags, id)
: (id > HTTP_HEADER_OTHER ? light_bclr(r->rqst_htags, id) : 0);
http_header_set_key_value(&r->rqst_headers, id, k, klen, v, vlen);
}
void http_header_request_append(request_st * const r, enum http_header_e id, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
if (0 == vlen) return;
light_bset(r->rqst_htags, id);
buffer * const vb = array_get_buf_ptr_ext(&r->rqst_headers, id, k, klen);
if (id != HTTP_HEADER_COOKIE)
http_header_token_append(vb, v, vlen);
else
http_header_token_append_cookie(vb, v, vlen);
}
buffer * http_header_env_get(const request_st * const r, const char *k, uint32_t klen) {
/* similar to http_header_generic_get_ifnotempty() but without id */
data_string * const ds =
(data_string *)array_get_element_klen(&r->env, k, klen);
return ds && !buffer_string_is_empty(&ds->value) ? &ds->value : NULL;
}
void http_header_env_set(request_st * const r, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
array_set_key_value(&r->env, k, klen, v, vlen);
}
void http_header_env_append(request_st * const r, const char *k, uint32_t klen, const char *v, uint32_t vlen) {
/*if (0 == vlen) return;*//* skip check; permit env var w/ blank value */
buffer * const vb = array_get_buf_ptr(&r->env, k, klen);
if (0 == vlen) return;
http_header_token_append(vb, v, vlen);
}
uint32_t
http_header_parse_hoff (const char *n, const uint32_t clen, unsigned short hoff[8192])
{
uint32_t hlen = 0;
for (const char *b; (n = memchr((b = n),'\n',clen-hlen)); ++n) {
uint32_t x = (uint32_t)(n - b + 1);
hlen += x;
if (x <= 2 && (x == 1 || n[-1] == '\r')) {
hoff[hoff[0]+1] = hlen;
return hlen;
}
if (++hoff[0] >= /*sizeof(hoff)/sizeof(hoff[0])-1*/ 8192-1) break;
hoff[hoff[0]] = hlen;
}
return 0;
}