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view src/http/v2/ngx_http_v2_table.c @ 7152:3b635e8fd499

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FastCGI: adjust buffer position when parsing incomplete records. Previously, nginx failed to move buffer position when parsing an incomplete record header, and due to this wasn't be able to continue parsing once remaining bytes of the record header were received. This can affect response header parsing, potentially generating spurious errors like "upstream sent unexpected FastCGI request id high byte: 1 while reading response header from upstream". While this is very unlikely, since usually record headers are written in a single buffer, this still can happen in real life, for example, if a record header will be split across two TCP packets and the second packet will be delayed. This does not affect non-buffered response body proxying, due to "buf->pos = buf->last;" at the start of the ngx_http_fastcgi_non_buffered_filter() function. Also this does not affect buffered response body proxying, as each input buffer is only passed to the filter once.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 09 Nov 2017 15:35:20 +0300
parents 2bf605c6edf7
children 87e9e4aabf1b
line wrap: on
line source


/*
 * Copyright (C) Nginx, Inc.
 * Copyright (C) Valentin V. Bartenev
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


#define NGX_HTTP_V2_TABLE_SIZE  4096


static ngx_int_t ngx_http_v2_table_account(ngx_http_v2_connection_t *h2c,
    size_t size);


static ngx_http_v2_header_t  ngx_http_v2_static_table[] = {
    { ngx_string(":authority"), ngx_string("") },
    { ngx_string(":method"), ngx_string("GET") },
    { ngx_string(":method"), ngx_string("POST") },
    { ngx_string(":path"), ngx_string("/") },
    { ngx_string(":path"), ngx_string("/index.html") },
    { ngx_string(":scheme"), ngx_string("http") },
    { ngx_string(":scheme"), ngx_string("https") },
    { ngx_string(":status"), ngx_string("200") },
    { ngx_string(":status"), ngx_string("204") },
    { ngx_string(":status"), ngx_string("206") },
    { ngx_string(":status"), ngx_string("304") },
    { ngx_string(":status"), ngx_string("400") },
    { ngx_string(":status"), ngx_string("404") },
    { ngx_string(":status"), ngx_string("500") },
    { ngx_string("accept-charset"), ngx_string("") },
    { ngx_string("accept-encoding"), ngx_string("gzip, deflate") },
    { ngx_string("accept-language"), ngx_string("") },
    { ngx_string("accept-ranges"), ngx_string("") },
    { ngx_string("accept"), ngx_string("") },
    { ngx_string("access-control-allow-origin"), ngx_string("") },
    { ngx_string("age"), ngx_string("") },
    { ngx_string("allow"), ngx_string("") },
    { ngx_string("authorization"), ngx_string("") },
    { ngx_string("cache-control"), ngx_string("") },
    { ngx_string("content-disposition"), ngx_string("") },
    { ngx_string("content-encoding"), ngx_string("") },
    { ngx_string("content-language"), ngx_string("") },
    { ngx_string("content-length"), ngx_string("") },
    { ngx_string("content-location"), ngx_string("") },
    { ngx_string("content-range"), ngx_string("") },
    { ngx_string("content-type"), ngx_string("") },
    { ngx_string("cookie"), ngx_string("") },
    { ngx_string("date"), ngx_string("") },
    { ngx_string("etag"), ngx_string("") },
    { ngx_string("expect"), ngx_string("") },
    { ngx_string("expires"), ngx_string("") },
    { ngx_string("from"), ngx_string("") },
    { ngx_string("host"), ngx_string("") },
    { ngx_string("if-match"), ngx_string("") },
    { ngx_string("if-modified-since"), ngx_string("") },
    { ngx_string("if-none-match"), ngx_string("") },
    { ngx_string("if-range"), ngx_string("") },
    { ngx_string("if-unmodified-since"), ngx_string("") },
    { ngx_string("last-modified"), ngx_string("") },
    { ngx_string("link"), ngx_string("") },
    { ngx_string("location"), ngx_string("") },
    { ngx_string("max-forwards"), ngx_string("") },
    { ngx_string("proxy-authenticate"), ngx_string("") },
    { ngx_string("proxy-authorization"), ngx_string("") },
    { ngx_string("range"), ngx_string("") },
    { ngx_string("referer"), ngx_string("") },
    { ngx_string("refresh"), ngx_string("") },
    { ngx_string("retry-after"), ngx_string("") },
    { ngx_string("server"), ngx_string("") },
    { ngx_string("set-cookie"), ngx_string("") },
    { ngx_string("strict-transport-security"), ngx_string("") },
    { ngx_string("transfer-encoding"), ngx_string("") },
    { ngx_string("user-agent"), ngx_string("") },
    { ngx_string("vary"), ngx_string("") },
    { ngx_string("via"), ngx_string("") },
    { ngx_string("www-authenticate"), ngx_string("") },
};

#define NGX_HTTP_V2_STATIC_TABLE_ENTRIES                                      \
    (sizeof(ngx_http_v2_static_table)                                         \
     / sizeof(ngx_http_v2_header_t))


ngx_int_t
ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c, ngx_uint_t index,
    ngx_uint_t name_only)
{
    u_char                *p;
    size_t                 rest;
    ngx_http_v2_header_t  *entry;

    if (index == 0) {
        ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
                      "client sent invalid hpack table index 0");
        return NGX_ERROR;
    }

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
                   "http2 get indexed %s: %ui",
                   name_only ? "name" : "header", index);

    index--;

    if (index < NGX_HTTP_V2_STATIC_TABLE_ENTRIES) {
        h2c->state.header = ngx_http_v2_static_table[index];
        return NGX_OK;
    }

    index -= NGX_HTTP_V2_STATIC_TABLE_ENTRIES;

    if (index < h2c->hpack.added - h2c->hpack.deleted) {
        index = (h2c->hpack.added - index - 1) % h2c->hpack.allocated;
        entry = h2c->hpack.entries[index];

        p = ngx_pnalloc(h2c->state.pool, entry->name.len + 1);
        if (p == NULL) {
            return NGX_ERROR;
        }

        h2c->state.header.name.len = entry->name.len;
        h2c->state.header.name.data = p;

        rest = h2c->hpack.storage + NGX_HTTP_V2_TABLE_SIZE - entry->name.data;

        if (entry->name.len > rest) {
            p = ngx_cpymem(p, entry->name.data, rest);
            p = ngx_cpymem(p, h2c->hpack.storage, entry->name.len - rest);

        } else {
            p = ngx_cpymem(p, entry->name.data, entry->name.len);
        }

        *p = '\0';

        if (name_only) {
            return NGX_OK;
        }

        p = ngx_pnalloc(h2c->state.pool, entry->value.len + 1);
        if (p == NULL) {
            return NGX_ERROR;
        }

        h2c->state.header.value.len = entry->value.len;
        h2c->state.header.value.data = p;

        rest = h2c->hpack.storage + NGX_HTTP_V2_TABLE_SIZE - entry->value.data;

        if (entry->value.len > rest) {
            p = ngx_cpymem(p, entry->value.data, rest);
            p = ngx_cpymem(p, h2c->hpack.storage, entry->value.len - rest);

        } else {
            p = ngx_cpymem(p, entry->value.data, entry->value.len);
        }

        *p = '\0';

        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
                  "client sent out of bound hpack table index: %ui", index);

    return NGX_ERROR;
}


ngx_int_t
ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c,
    ngx_http_v2_header_t *header)
{
    size_t                 avail;
    ngx_uint_t             index;
    ngx_http_v2_header_t  *entry, **entries;

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
                   "http2 table add: \"%V: %V\"",
                   &header->name, &header->value);

    if (h2c->hpack.entries == NULL) {
        h2c->hpack.allocated = 64;
        h2c->hpack.size = NGX_HTTP_V2_TABLE_SIZE;
        h2c->hpack.free = NGX_HTTP_V2_TABLE_SIZE;

        h2c->hpack.entries = ngx_palloc(h2c->connection->pool,
                                        sizeof(ngx_http_v2_header_t *)
                                        * h2c->hpack.allocated);
        if (h2c->hpack.entries == NULL) {
            return NGX_ERROR;
        }

        h2c->hpack.storage = ngx_palloc(h2c->connection->pool,
                                        h2c->hpack.free);
        if (h2c->hpack.storage == NULL) {
            return NGX_ERROR;
        }

        h2c->hpack.pos = h2c->hpack.storage;
    }

    if (ngx_http_v2_table_account(h2c, header->name.len + header->value.len)
        != NGX_OK)
    {
        return NGX_OK;
    }

    if (h2c->hpack.reused == h2c->hpack.deleted) {
        entry = ngx_palloc(h2c->connection->pool, sizeof(ngx_http_v2_header_t));
        if (entry == NULL) {
            return NGX_ERROR;
        }

    } else {
        entry = h2c->hpack.entries[h2c->hpack.reused++ % h2c->hpack.allocated];
    }

    avail = h2c->hpack.storage + NGX_HTTP_V2_TABLE_SIZE - h2c->hpack.pos;

    entry->name.len = header->name.len;
    entry->name.data = h2c->hpack.pos;

    if (avail >= header->name.len) {
        h2c->hpack.pos = ngx_cpymem(h2c->hpack.pos, header->name.data,
                                    header->name.len);
    } else {
        ngx_memcpy(h2c->hpack.pos, header->name.data, avail);
        h2c->hpack.pos = ngx_cpymem(h2c->hpack.storage,
                                    header->name.data + avail,
                                    header->name.len - avail);
        avail = NGX_HTTP_V2_TABLE_SIZE;
    }

    avail -= header->name.len;

    entry->value.len = header->value.len;
    entry->value.data = h2c->hpack.pos;

    if (avail >= header->value.len) {
        h2c->hpack.pos = ngx_cpymem(h2c->hpack.pos, header->value.data,
                                    header->value.len);
    } else {
        ngx_memcpy(h2c->hpack.pos, header->value.data, avail);
        h2c->hpack.pos = ngx_cpymem(h2c->hpack.storage,
                                    header->value.data + avail,
                                    header->value.len - avail);
    }

    if (h2c->hpack.allocated == h2c->hpack.added - h2c->hpack.deleted) {

        entries = ngx_palloc(h2c->connection->pool,
                             sizeof(ngx_http_v2_header_t *)
                             * (h2c->hpack.allocated + 64));
        if (entries == NULL) {
            return NGX_ERROR;
        }

        index = h2c->hpack.deleted % h2c->hpack.allocated;

        ngx_memcpy(entries, &h2c->hpack.entries[index],
                   (h2c->hpack.allocated - index)
                   * sizeof(ngx_http_v2_header_t *));

        ngx_memcpy(&entries[h2c->hpack.allocated - index], h2c->hpack.entries,
                   index * sizeof(ngx_http_v2_header_t *));

        (void) ngx_pfree(h2c->connection->pool, h2c->hpack.entries);

        h2c->hpack.entries = entries;

        h2c->hpack.added = h2c->hpack.allocated;
        h2c->hpack.deleted = 0;
        h2c->hpack.reused = 0;
        h2c->hpack.allocated += 64;
    }

    h2c->hpack.entries[h2c->hpack.added++ % h2c->hpack.allocated] = entry;

    return NGX_OK;
}


static ngx_int_t
ngx_http_v2_table_account(ngx_http_v2_connection_t *h2c, size_t size)
{
    ngx_http_v2_header_t  *entry;

    size += 32;

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
                   "http2 table account: %uz free:%uz",
                   size, h2c->hpack.free);

    if (size <= h2c->hpack.free) {
        h2c->hpack.free -= size;
        return NGX_OK;
    }

    if (size > h2c->hpack.size) {
        h2c->hpack.deleted = h2c->hpack.added;
        h2c->hpack.free = h2c->hpack.size;
        return NGX_DECLINED;
    }

    do {
        entry = h2c->hpack.entries[h2c->hpack.deleted++ % h2c->hpack.allocated];
        h2c->hpack.free += 32 + entry->name.len + entry->value.len;
    } while (size > h2c->hpack.free);

    h2c->hpack.free -= size;

    return NGX_OK;
}


ngx_int_t
ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size)
{
    ssize_t                needed;
    ngx_http_v2_header_t  *entry;

    if (size > NGX_HTTP_V2_TABLE_SIZE) {
        ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
                      "client sent invalid table size update: %uz", size);

        return NGX_ERROR;
    }

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
                   "http2 new hpack table size: %uz was:%uz",
                   size, h2c->hpack.size);

    needed = h2c->hpack.size - size;

    while (needed > (ssize_t) h2c->hpack.free) {
        entry = h2c->hpack.entries[h2c->hpack.deleted++ % h2c->hpack.allocated];
        h2c->hpack.free += 32 + entry->name.len + entry->value.len;
    }

    h2c->hpack.size = size;
    h2c->hpack.free -= needed;

    return NGX_OK;
}