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http_htx.c
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/*
* Functions to manipulate HTTP messages using the internal representation.
*
* Copyright (C) 2018 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/cfgparse.h>
#include <haproxy/global.h>
#include <haproxy/h1.h>
#include <haproxy/http.h>
#include <haproxy/http_fetch.h>
#include <haproxy/http_htx.h>
#include <haproxy/htx.h>
#include <haproxy/log.h>
#include <haproxy/regex.h>
#include <haproxy/sample.h>
#include <haproxy/tools.h>
struct buffer http_err_chunks[HTTP_ERR_SIZE];
struct http_reply http_err_replies[HTTP_ERR_SIZE];
struct eb_root http_error_messages = EB_ROOT;
struct list http_errors_list = LIST_HEAD_INIT(http_errors_list);
struct list http_replies_list = LIST_HEAD_INIT(http_replies_list);
/* The declaration of an errorfiles/errorfile directives. Used during config
* parsing only. */
struct conf_errors {
char type; /* directive type (0: errorfiles, 1: errorfile) */
union {
struct {
int status; /* the status code associated to this error */
struct http_reply *reply; /* the http reply for the errorfile */
} errorfile; /* describe an "errorfile" directive */
struct {
char *name; /* the http-errors section name */
char status[HTTP_ERR_SIZE]; /* list of status to import (0: ignore, 1: implicit import, 2: explicit import) */
} errorfiles; /* describe an "errorfiles" directive */
} info;
char *file; /* file where the directive appears */
int line; /* line where the directive appears */
struct list list; /* next conf_errors */
};
/* Returns the next unporocessed start line in the HTX message. It returns NULL
* if the start-line is undefined (first == -1). Otherwise, it returns the
* pointer on the htx_sl structure.
*/
struct htx_sl *http_get_stline(const struct htx *htx)
{
struct htx_blk *blk;
blk = htx_get_first_blk(htx);
if (!blk || (htx_get_blk_type(blk) != HTX_BLK_REQ_SL && htx_get_blk_type(blk) != HTX_BLK_RES_SL))
return NULL;
return htx_get_blk_ptr(htx, blk);
}
/* Returns the headers size in the HTX message */
size_t http_get_hdrs_size(struct htx *htx)
{
struct htx_blk *blk;
size_t sz = 0;
blk = htx_get_first_blk(htx);
if (!blk || htx_get_blk_type(blk) > HTX_BLK_EOH)
return sz;
for (; blk; blk = htx_get_next_blk(htx, blk)) {
sz += htx_get_blksz(blk);
if (htx_get_blk_type(blk) == HTX_BLK_EOH)
break;
}
return sz;
}
/* Finds the first or next occurrence of header matching <pattern> in the HTX
* message <htx> using the context <ctx>. This structure holds everything
* necessary to use the header and find next occurrence. If its <blk> member is
* NULL, the header is searched from the beginning. Otherwise, the next
* occurrence is returned. The function returns 1 when it finds a value, and 0
* when there is no more. It is designed to work with headers defined as
* comma-separated lists. If HTTP_FIND_FL_FULL flag is set, it works on
* full-line headers in whose comma is not a delimiter but is part of the
* syntax. A special case, if ctx->value is NULL when searching for a new values
* of a header, the current header is rescanned. This allows rescanning after a
* header deletion.
*
* The matching method is chosen by checking the flags :
*
* * HTTP_FIND_FL_MATCH_REG : <pattern> is a regex. header names matching
* the regex are evaluated.
* * HTTP_FIND_FL_MATCH_STR : <pattern> is a string. The header names equal
* to the string are evaluated.
* * HTTP_FIND_FL_MATCH_PFX : <pattern> is a string. The header names
* starting by the string are evaluated.
* * HTTP_FIND_FL_MATCH_SFX : <pattern> is a string. The header names
* ending by the string are evaluated.
* * HTTP_FIND_FL_MATCH_SUB : <pattern> is a string. The header names
* containing the string are evaluated.
*/
#define HTTP_FIND_FL_MATCH_STR 0x0001
#define HTTP_FIND_FL_MATCH_PFX 0x0002
#define HTTP_FIND_FL_MATCH_SFX 0x0003
#define HTTP_FIND_FL_MATCH_SUB 0x0004
#define HTTP_FIND_FL_MATCH_REG 0x0005
/* 0x0006..0x000f: for other matching methods */
#define HTTP_FIND_FL_MATCH_TYPE 0x000F
#define HTTP_FIND_FL_FULL 0x0010
static int __http_find_header(const struct htx *htx, const void *pattern, struct http_hdr_ctx *ctx, int flags)
{
struct htx_blk *blk = ctx->blk;
struct ist n, v;
enum htx_blk_type type;
if (blk) {
char *p;
if (!isttest(ctx->value))
goto rescan_hdr;
if (flags & HTTP_FIND_FL_FULL)
goto next_blk;
v = htx_get_blk_value(htx, blk);
p = ctx->value.ptr + ctx->value.len + ctx->lws_after;
v.len -= (p - v.ptr);
v.ptr = p;
if (!v.len)
goto next_blk;
/* Skip comma */
if (*(v.ptr) == ',') {
v.ptr++;
v.len--;
}
goto return_hdr;
}
if (htx_is_empty(htx))
return 0;
for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
rescan_hdr:
type = htx_get_blk_type(blk);
if (type == HTX_BLK_EOH)
break;
if (type != HTX_BLK_HDR)
continue;
if ((flags & HTTP_FIND_FL_MATCH_TYPE) == HTTP_FIND_FL_MATCH_REG) {
const struct my_regex *re = pattern;
n = htx_get_blk_name(htx, blk);
if (!regex_exec2(re, n.ptr, n.len))
goto next_blk;
}
else {
const struct ist name = *(const struct ist *)(pattern);
/* If no name was passed, we want any header. So skip the comparison */
if (!istlen(name))
goto match;
n = htx_get_blk_name(htx, blk);
switch (flags & HTTP_FIND_FL_MATCH_TYPE) {
case HTTP_FIND_FL_MATCH_STR:
if (!isteqi(n, name))
goto next_blk;
break;
case HTTP_FIND_FL_MATCH_PFX:
if (istlen(n) < istlen(name))
goto next_blk;
n = ist2(istptr(n), istlen(name));
if (!isteqi(n, name))
goto next_blk;
break;
case HTTP_FIND_FL_MATCH_SFX:
if (istlen(n) < istlen(name))
goto next_blk;
n = ist2(istptr(n) + istlen(n) - istlen(name), istlen(name));
if (!isteqi(n, name))
goto next_blk;
break;
case HTTP_FIND_FL_MATCH_SUB:
if (!strnistr(n.ptr, n.len, name.ptr, name.len))
goto next_blk;
break;
default:
goto next_blk;
break;
}
}
match:
v = htx_get_blk_value(htx, blk);
return_hdr:
ctx->lws_before = 0;
ctx->lws_after = 0;
while (v.len && HTTP_IS_LWS(*v.ptr)) {
v.ptr++;
v.len--;
ctx->lws_before++;
}
if (!(flags & HTTP_FIND_FL_FULL))
v.len = http_find_hdr_value_end(v.ptr, v.ptr + v.len) - v.ptr;
while (v.len && HTTP_IS_LWS(*(v.ptr + v.len - 1))) {
v.len--;
ctx->lws_after++;
}
ctx->blk = blk;
ctx->value = v;
return 1;
next_blk:
;
}
ctx->blk = NULL;
ctx->value = ist("");
ctx->lws_before = ctx->lws_after = 0;
return 0;
}
/* Header names must match <name> */
int http_find_header(const struct htx *htx, const struct ist name, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &name, ctx, HTTP_FIND_FL_MATCH_STR | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must match <name>. Same than http_find_header */
int http_find_str_header(const struct htx *htx, const struct ist name, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &name, ctx, HTTP_FIND_FL_MATCH_STR | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must start with <prefix> */
int http_find_pfx_header(const struct htx *htx, const struct ist prefix, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &prefix, ctx, HTTP_FIND_FL_MATCH_PFX | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must end with <suffix> */
int http_find_sfx_header(const struct htx *htx, const struct ist suffix, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &suffix, ctx, HTTP_FIND_FL_MATCH_SFX | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must contain <sub> */
int http_find_sub_header(const struct htx *htx, const struct ist sub, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &sub, ctx, HTTP_FIND_FL_MATCH_SUB | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must match <re> regex*/
int http_match_header(const struct htx *htx, const struct my_regex *re, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, re, ctx, HTTP_FIND_FL_MATCH_REG | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Adds a header block int the HTX message <htx>, just before the EOH block. It
* returns 1 on success, otherwise it returns 0.
*/
int http_add_header(struct htx *htx, const struct ist n, const struct ist v)
{
struct htx_blk *blk;
struct htx_sl *sl;
enum htx_blk_type type = htx_get_tail_type(htx);
int32_t prev;
blk = htx_add_header(htx, n, v);
if (!blk)
goto fail;
if (unlikely(type < HTX_BLK_EOH))
goto end;
/* <blk> is the head, swap it iteratively with its predecessor to place
* it just before the end-of-header block. So blocks remains ordered. */
for (prev = htx_get_prev(htx, htx->tail); prev != htx->first; prev = htx_get_prev(htx, prev)) {
struct htx_blk *pblk = htx_get_blk(htx, prev);
enum htx_blk_type type = htx_get_blk_type(pblk);
/* Swap .addr and .info fields */
blk->addr ^= pblk->addr; pblk->addr ^= blk->addr; blk->addr ^= pblk->addr;
blk->info ^= pblk->info; pblk->info ^= blk->info; blk->info ^= pblk->info;
if (blk->addr == pblk->addr)
blk->addr += htx_get_blksz(pblk);
/* Stop when end-of-header is reached */
if (type == HTX_BLK_EOH)
break;
blk = pblk;
}
end:
sl = http_get_stline(htx);
if (sl && (sl->flags & HTX_SL_F_HAS_AUTHORITY) && isteqi(n, ist("host"))) {
if (!http_update_authority(htx, sl, v))
goto fail;
}
return 1;
fail:
return 0;
}
/* Replaces parts of the start-line of the HTX message <htx>. It returns 1 on
* success, otherwise it returns 0.
*/
int http_replace_stline(struct htx *htx, const struct ist p1, const struct ist p2, const struct ist p3)
{
struct htx_blk *blk;
blk = htx_get_first_blk(htx);
if (!blk || !htx_replace_stline(htx, blk, p1, p2, p3))
return 0;
return 1;
}
/* Replace the request method in the HTX message <htx> by <meth>. It returns 1
* on success, otherwise 0.
*/
int http_replace_req_meth(struct htx *htx, const struct ist meth)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist uri, vsn;
if (!sl)
return 0;
/* Start by copying old uri and version */
chunk_memcat(temp, HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl)); /* uri */
uri = ist2(temp->area, HTX_SL_REQ_ULEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + uri.len, HTX_SL_REQ_VLEN(sl));
/* create the new start line */
sl->info.req.meth = find_http_meth(meth.ptr, meth.len);
return http_replace_stline(htx, meth, uri, vsn);
}
/* Replace the request uri in the HTX message <htx> by <uri>. It returns 1 on
* success, otherwise 0.
*/
int http_replace_req_uri(struct htx *htx, const struct ist uri)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist meth, vsn;
if (!sl)
goto fail;
/* Start by copying old method and version */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
/* create the new start line */
if (!http_replace_stline(htx, meth, uri, vsn))
goto fail;
sl = http_get_stline(htx);
if (!http_update_host(htx, sl, uri))
goto fail;
return 1;
fail:
return 0;
}
/* Replace the request path in the HTX message <htx> by <path>. The host part is
* preserverd. if <with_qs> is set, the query string is evaluated as part of the
* path and replaced. Otherwise, it is preserved too. It returns 1 on success,
* otherwise 0.
*/
int http_replace_req_path(struct htx *htx, const struct ist path, int with_qs)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist meth, uri, vsn, p;
size_t plen = 0;
struct http_uri_parser parser;
if (!sl)
return 0;
uri = htx_sl_req_uri(sl);
parser = http_uri_parser_init(uri);
p = http_parse_path(&parser);
if (!isttest(p))
p = uri;
if (with_qs)
plen = p.len;
else {
while (plen < p.len && *(p.ptr + plen) != '?')
plen++;
}
/* Start by copying old method and version and create the new uri */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
chunk_memcat(temp, uri.ptr, p.ptr - uri.ptr); /* uri: host part */
chunk_memcat(temp, path.ptr, path.len); /* uri: new path */
chunk_memcat(temp, p.ptr + plen, p.len - plen); /* uri: QS part */
uri = ist2(temp->area + meth.len + vsn.len, uri.len - plen + path.len);
/* create the new start line */
return http_replace_stline(htx, meth, uri, vsn);
}
/* Replace the request query-string in the HTX message <htx> by <query>. The
* host part and the path are preserved. It returns 1 on success, otherwise
* 0.
*/
int http_replace_req_query(struct htx *htx, const struct ist query)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist meth, uri, vsn, q;
int offset = 1;
if (!sl)
return 0;
uri = htx_sl_req_uri(sl);
q = uri;
while (q.len > 0 && *(q.ptr) != '?') {
q.ptr++;
q.len--;
}
/* skip the question mark or indicate that we must insert it
* (but only if the format string is not empty then).
*/
if (q.len) {
q.ptr++;
q.len--;
}
else if (query.len > 1)
offset = 0;
/* Start by copying old method and version and create the new uri */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
chunk_memcat(temp, uri.ptr, q.ptr - uri.ptr); /* uri: host + path part */
chunk_memcat(temp, query.ptr + offset, query.len - offset); /* uri: new QS */
uri = ist2(temp->area + meth.len + vsn.len, uri.len - q.len + query.len - offset);
/* create the new start line */
return http_replace_stline(htx, meth, uri, vsn);
}
/* Replace the response status in the HTX message <htx> by <status>. It returns
* 1 on success, otherwise 0.
*/
int http_replace_res_status(struct htx *htx, const struct ist status, const struct ist reason)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist vsn, r;
if (!sl)
return 0;
/* Start by copying old uri and version */
chunk_memcat(temp, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl)); /* vsn */
vsn = ist2(temp->area, HTX_SL_RES_VLEN(sl));
r = reason;
if (!isttest(r)) {
chunk_memcat(temp, HTX_SL_RES_RPTR(sl), HTX_SL_RES_RLEN(sl)); /* reason */
r = ist2(temp->area + vsn.len, HTX_SL_RES_RLEN(sl));
}
/* create the new start line */
sl->info.res.status = strl2ui(status.ptr, status.len);
return http_replace_stline(htx, vsn, status, r);
}
/* Replace the response reason in the HTX message <htx> by <reason>. It returns
* 1 on success, otherwise 0.
*/
int http_replace_res_reason(struct htx *htx, const struct ist reason)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist vsn, status;
if (!sl)
return 0;
/* Start by copying old uri and version */
chunk_memcat(temp, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl)); /* vsn */
vsn = ist2(temp->area, HTX_SL_RES_VLEN(sl));
chunk_memcat(temp, HTX_SL_RES_CPTR(sl), HTX_SL_RES_CLEN(sl)); /* code */
status = ist2(temp->area + vsn.len, HTX_SL_RES_CLEN(sl));
/* create the new start line */
return http_replace_stline(htx, vsn, status, reason);
}
/* Replaces a part of a header value referenced in the context <ctx> by
* <data>. It returns 1 on success, otherwise it returns 0. The context is
* updated if necessary.
*/
int http_replace_header_value(struct htx *htx, struct http_hdr_ctx *ctx, const struct ist data)
{
struct htx_blk *blk = ctx->blk;
struct htx_sl *sl;
char *start;
struct ist v;
uint32_t len, off;
if (!blk)
goto fail;
v = htx_get_blk_value(htx, blk);
start = ctx->value.ptr - ctx->lws_before;
len = ctx->lws_before + ctx->value.len + ctx->lws_after;
off = start - v.ptr;
blk = htx_replace_blk_value(htx, blk, ist2(start, len), data);
if (!blk)
goto fail;
v = htx_get_blk_value(htx, blk);
sl = http_get_stline(htx);
if (sl && (sl->flags & HTX_SL_F_HAS_AUTHORITY)) {
struct ist n = htx_get_blk_name(htx, blk);
if (isteq(n, ist("host"))) {
if (!http_update_authority(htx, sl, v))
goto fail;
ctx->blk = NULL;
http_find_header(htx, ist("host"), ctx, 1);
blk = ctx->blk;
v = htx_get_blk_value(htx, blk);
}
}
ctx->blk = blk;
ctx->value.ptr = v.ptr + off;
ctx->value.len = data.len;
ctx->lws_before = ctx->lws_after = 0;
return 1;
fail:
return 0;
}
/* Fully replaces a header referenced in the context <ctx> by the name <name>
* with the value <value>. It returns 1 on success, otherwise it returns 0. The
* context is updated if necessary.
*/
int http_replace_header(struct htx *htx, struct http_hdr_ctx *ctx,
const struct ist name, const struct ist value)
{
struct htx_blk *blk = ctx->blk;
struct htx_sl *sl;
if (!blk)
goto fail;
blk = htx_replace_header(htx, blk, name, value);
if (!blk)
goto fail;
sl = http_get_stline(htx);
if (sl && (sl->flags & HTX_SL_F_HAS_AUTHORITY) && isteqi(name, ist("host"))) {
if (!http_update_authority(htx, sl, value))
goto fail;
ctx->blk = NULL;
http_find_header(htx, ist("host"), ctx, 1);
blk = ctx->blk;
}
ctx->blk = blk;
ctx->value = ist(NULL);
ctx->lws_before = ctx->lws_after = 0;
return 1;
fail:
return 0;
}
/* Remove one value of a header. This only works on a <ctx> returned by
* http_find_header function. The value is removed, as well as surrounding commas
* if any. If the removed value was alone, the whole header is removed. The
* <ctx> is always updated accordingly, as well as the HTX message <htx>. It
* returns 1 on success. Otherwise, it returns 0. The <ctx> is always left in a
* form that can be handled by http_find_header() to find next occurrence.
*/
int http_remove_header(struct htx *htx, struct http_hdr_ctx *ctx)
{
struct htx_blk *blk = ctx->blk;
char *start;
struct ist v;
uint32_t len;
if (!blk)
return 0;
start = ctx->value.ptr - ctx->lws_before;
len = ctx->lws_before + ctx->value.len + ctx->lws_after;
v = htx_get_blk_value(htx, blk);
if (len == v.len) {
blk = htx_remove_blk(htx, blk);
if (blk || htx_is_empty(htx)) {
ctx->blk = blk;
ctx->value = IST_NULL;
ctx->lws_before = ctx->lws_after = 0;
}
else {
ctx->blk = htx_get_blk(htx, htx->tail);
ctx->value = htx_get_blk_value(htx, ctx->blk);
ctx->lws_before = ctx->lws_after = 0;
}
return 1;
}
/* This was not the only value of this header. We have to remove the
* part pointed by ctx->value. If it is the last entry of the list, we
* remove the last separator.
*/
if (start == v.ptr) {
/* It's the first header part but not the only one. So remove
* the comma after it. */
len++;
}
else {
/* There is at least one header part before the removed one. So
* remove the comma between them. */
start--;
len++;
}
/* Update the block content and its len */
memmove(start, start+len, v.len-len);
htx_change_blk_value_len(htx, blk, v.len-len);
/* Finally update the ctx */
ctx->value.ptr = start;
ctx->value.len = 0;
ctx->lws_before = ctx->lws_after = 0;
return 1;
}
/* Updates the authority part of the uri with the value <host>. It happens when
* the header host is modified. It returns 0 on failure and 1 on success. It is
* the caller responsibility to provide the start-line and to be sure the uri
* contains an authority. Thus, if no authority is found in the uri, an error is
* returned.
*/
int http_update_authority(struct htx *htx, struct htx_sl *sl, const struct ist host)
{
struct buffer *temp = get_trash_chunk();
struct ist meth, vsn, uri, authority;
struct http_uri_parser parser;
uri = htx_sl_req_uri(sl);
parser = http_uri_parser_init(uri);
authority = http_parse_authority(&parser, 1);
if (!authority.len)
return 0;
/* Don't update the uri if there is no change */
if (isteq(host, authority))
return 1;
/* Start by copying old method and version */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
chunk_memcat(temp, uri.ptr, authority.ptr - uri.ptr);
chunk_memcat(temp, host.ptr, host.len);
chunk_memcat(temp, authority.ptr + authority.len, uri.ptr + uri.len - (authority.ptr + authority.len));
uri = ist2(temp->area + meth.len + vsn.len, host.len + uri.len - authority.len); /* uri */
return http_replace_stline(htx, meth, uri, vsn);
}
/* Update the header host by extracting the authority of the uri <uri>. flags of
* the start-line are also updated accordingly. For orgin-form and asterisk-form
* uri, the header host is not changed and the flag HTX_SL_F_HAS_AUTHORITY is
* removed from the flags of the start-line. Otherwise, this flag is set and the
* authority is used to set the value of the header host. This function returns
* 0 on failure and 1 on success.
*/
int http_update_host(struct htx *htx, struct htx_sl *sl, const struct ist uri)
{
struct ist authority;
struct http_hdr_ctx ctx;
struct http_uri_parser parser = http_uri_parser_init(uri);
if (parser.format == URI_PARSER_FORMAT_EMPTY ||
parser.format == URI_PARSER_FORMAT_ASTERISK ||
parser.format == URI_PARSER_FORMAT_ABSPATH) {
sl->flags &= ~HTX_SL_F_HAS_AUTHORITY;
}
else {
sl->flags |= HTX_SL_F_HAS_AUTHORITY;
if (sl->info.req.meth != HTTP_METH_CONNECT) {
// absolute-form (RFC7320 #5.3.2)
sl->flags |= HTX_SL_F_HAS_SCHM;
if (uri.len > 4 && (uri.ptr[0] | 0x20) == 'h')
sl->flags |= ((uri.ptr[4] == ':') ? HTX_SL_F_SCHM_HTTP : HTX_SL_F_SCHM_HTTPS);
authority = http_parse_authority(&parser, 1);
if (!authority.len)
goto fail;
}
else {
// authority-form (RFC7320 #5.3.3)
authority = uri;
}
/* Replace header host value */
ctx.blk = NULL;
while (http_find_header(htx, ist("host"), &ctx, 1)) {
if (!http_replace_header_value(htx, &ctx, authority))
goto fail;
}
}
return 1;
fail:
return 0;
}
/* Return in <vptr> and <vlen> the pointer and length of occurrence <occ> of
* header whose name is <hname> of length <hlen>. If <ctx> is null, lookup is
* performed over the whole headers. Otherwise it must contain a valid header
* context, initialised with ctx->blk=NULL for the first lookup in a series. If
* <occ> is positive or null, occurrence #occ from the beginning (or last ctx)
* is returned. Occ #0 and #1 are equivalent. If <occ> is negative (and no less
* than -MAX_HDR_HISTORY), the occurrence is counted from the last one which is
* -1. The value fetch stops at commas, so this function is suited for use with
* list headers.
* The return value is 0 if nothing was found, or non-zero otherwise.
*/
unsigned int http_get_htx_hdr(const struct htx *htx, const struct ist hdr,
int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen)
{
struct http_hdr_ctx local_ctx;
struct ist val_hist[MAX_HDR_HISTORY];
unsigned int hist_idx;
int found;
if (!ctx) {
local_ctx.blk = NULL;
ctx = &local_ctx;
}
if (occ >= 0) {
/* search from the beginning */
while (http_find_header(htx, hdr, ctx, 0)) {
occ--;
if (occ <= 0) {
*vptr = ctx->value.ptr;
*vlen = ctx->value.len;
return 1;
}
}
return 0;
}
/* negative occurrence, we scan all the list then walk back */
if (-occ > MAX_HDR_HISTORY)
return 0;
found = hist_idx = 0;
while (http_find_header(htx, hdr, ctx, 0)) {
val_hist[hist_idx] = ctx->value;
if (++hist_idx >= MAX_HDR_HISTORY)
hist_idx = 0;
found++;
}
if (-occ > found)
return 0;
/* OK now we have the last occurrence in [hist_idx-1], and we need to
* find occurrence -occ. 0 <= hist_idx < MAX_HDR_HISTORY, and we have
* -10 <= occ <= -1. So we have to check [hist_idx%MAX_HDR_HISTORY+occ]
* to remain in the 0..9 range.
*/
hist_idx += occ + MAX_HDR_HISTORY;
if (hist_idx >= MAX_HDR_HISTORY)
hist_idx -= MAX_HDR_HISTORY;
*vptr = val_hist[hist_idx].ptr;
*vlen = val_hist[hist_idx].len;
return 1;
}
/* Return in <vptr> and <vlen> the pointer and length of occurrence <occ> of
* header whose name is <hname> of length <hlen>. If <ctx> is null, lookup is
* performed over the whole headers. Otherwise it must contain a valid header
* context, initialised with ctx->blk=NULL for the first lookup in a series. If
* <occ> is positive or null, occurrence #occ from the beginning (or last ctx)
* is returned. Occ #0 and #1 are equivalent. If <occ> is negative (and no less
* than -MAX_HDR_HISTORY), the occurrence is counted from the last one which is
* -1. This function differs from http_get_hdr() in that it only returns full
* line header values and does not stop at commas.
* The return value is 0 if nothing was found, or non-zero otherwise.
*/
unsigned int http_get_htx_fhdr(const struct htx *htx, const struct ist hdr,
int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen)
{
struct http_hdr_ctx local_ctx;
struct ist val_hist[MAX_HDR_HISTORY];
unsigned int hist_idx;
int found;
if (!ctx) {
local_ctx.blk = NULL;
ctx = &local_ctx;
}
if (occ >= 0) {
/* search from the beginning */
while (http_find_header(htx, hdr, ctx, 1)) {
occ--;
if (occ <= 0) {
*vptr = ctx->value.ptr;
*vlen = ctx->value.len;
return 1;
}
}
return 0;
}
/* negative occurrence, we scan all the list then walk back */
if (-occ > MAX_HDR_HISTORY)
return 0;
found = hist_idx = 0;
while (http_find_header(htx, hdr, ctx, 1)) {
val_hist[hist_idx] = ctx->value;
if (++hist_idx >= MAX_HDR_HISTORY)
hist_idx = 0;
found++;
}
if (-occ > found)
return 0;
/* OK now we have the last occurrence in [hist_idx-1], and we need to
* find occurrence -occ. 0 <= hist_idx < MAX_HDR_HISTORY, and we have
* -10 <= occ <= -1. So we have to check [hist_idx%MAX_HDR_HISTORY+occ]
* to remain in the 0..9 range.
*/
hist_idx += occ + MAX_HDR_HISTORY;
if (hist_idx >= MAX_HDR_HISTORY)
hist_idx -= MAX_HDR_HISTORY;
*vptr = val_hist[hist_idx].ptr;
*vlen = val_hist[hist_idx].len;
return 1;
}
int http_str_to_htx(struct buffer *buf, struct ist raw, char **errmsg)
{
struct htx *htx;
struct htx_sl *sl;
struct h1m h1m;
struct http_hdr hdrs[global.tune.max_http_hdr];
union h1_sl h1sl;
unsigned int flags = HTX_SL_F_IS_RESP;
int ret = 0;
b_reset(buf);
if (!raw.len) {
buf->size = 0;
buf->area = NULL;
return 1;
}
buf->size = global.tune.bufsize;
buf->area = malloc(buf->size);
if (!buf->area)
goto error;
h1m_init_res(&h1m);
h1m.flags |= H1_MF_NO_PHDR;
ret = h1_headers_to_hdr_list(raw.ptr, raw.ptr + raw.len,
hdrs, sizeof(hdrs)/sizeof(hdrs[0]), &h1m, &h1sl);
if (ret <= 0) {
memprintf(errmsg, "unabled to parse headers (error offset: %d)", h1m.err_pos);
goto error;
}
if (unlikely(h1sl.st.v.len != 8)) {
memprintf(errmsg, "invalid http version (%.*s)", (int)h1sl.st.v.len, h1sl.st.v.ptr);
goto error;
}
if ((*(h1sl.st.v.ptr + 5) > '1') ||
((*(h1sl.st.v.ptr + 5) == '1') && (*(h1sl.st.v.ptr + 7) >= '1')))
h1m.flags |= H1_MF_VER_11;
if (h1sl.st.status < 200 && (h1sl.st.status == 100 || h1sl.st.status >= 102)) {
memprintf(errmsg, "invalid http status code for an error message (%u)",
h1sl.st.status);
goto error;
}
if (h1sl.st.status == 204 || h1sl.st.status == 304) {
/* Responses known to have no body. */
h1m.flags &= ~(H1_MF_CLEN|H1_MF_CHNK);
h1m.flags |= H1_MF_XFER_LEN;
h1m.curr_len = h1m.body_len = 0;
}
else if (h1m.flags & (H1_MF_CLEN|H1_MF_CHNK))
h1m.flags |= H1_MF_XFER_LEN;
if (h1m.flags & H1_MF_VER_11)
flags |= HTX_SL_F_VER_11;
if (h1m.flags & H1_MF_XFER_ENC)
flags |= HTX_SL_F_XFER_ENC;
if (h1m.flags & H1_MF_XFER_LEN) {
flags |= HTX_SL_F_XFER_LEN;
if (h1m.flags & H1_MF_CHNK) {
memprintf(errmsg, "chunk-encoded payload not supported");
goto error;
}
else if (h1m.flags & H1_MF_CLEN) {
flags |= HTX_SL_F_CLEN;
if (h1m.body_len == 0)
flags |= HTX_SL_F_BODYLESS;
}
else
flags |= HTX_SL_F_BODYLESS;
}
if ((flags & HTX_SL_F_BODYLESS) && raw.len > ret) {
memprintf(errmsg, "message payload not expected");
goto error;
}
if ((flags & HTX_SL_F_CLEN) && h1m.body_len != (raw.len - ret)) {
memprintf(errmsg, "payload size does not match the announced content-length (%lu != %lu)",
(unsigned long)(raw.len - ret), (unsigned long)h1m.body_len);
goto error;
}
htx = htx_from_buf(buf);
sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags, h1sl.st.v, h1sl.st.c, h1sl.st.r);
if (!sl || !htx_add_all_headers(htx, hdrs)) {
memprintf(errmsg, "unable to add headers into the HTX message");
goto error;
}
sl->info.res.status = h1sl.st.status;
while (raw.len > ret) {
int sent = htx_add_data(htx, ist2(raw.ptr + ret, raw.len - ret));
if (!sent) {
memprintf(errmsg, "unable to add payload into the HTX message");
goto error;
}
ret += sent;
}
htx->flags |= HTX_FL_EOM;