view src/http/modules/ngx_http_chunked_filter_module.c @ 7730:1a719ee45526

Upstream: proxy_ssl_conf_command and friends. Similarly to ssl_conf_command, proxy_ssl_conf_command (grpc_ssl_conf_command, uwsgi_ssl_conf_command) can be used to set arbitrary OpenSSL configuration parameters as long as nginx is compiled with OpenSSL 1.0.2 or later, when connecting to upstream servers with SSL. Full list of available configuration commands can be found in the SSL_CONF_cmd manual page (https://www.openssl.org/docs/man1.1.1/man3/SSL_CONF_cmd.html).
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 22 Oct 2020 18:00:23 +0300
parents 1b068a4e82d8
children 46e3542d51b3
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


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


typedef struct {
    ngx_chain_t         *free;
    ngx_chain_t         *busy;
} ngx_http_chunked_filter_ctx_t;


static ngx_int_t ngx_http_chunked_filter_init(ngx_conf_t *cf);
static ngx_chain_t *ngx_http_chunked_create_trailers(ngx_http_request_t *r,
    ngx_http_chunked_filter_ctx_t *ctx);


static ngx_http_module_t  ngx_http_chunked_filter_module_ctx = {
    NULL,                                  /* preconfiguration */
    ngx_http_chunked_filter_init,          /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    NULL,                                  /* create location configuration */
    NULL                                   /* merge location configuration */
};


ngx_module_t  ngx_http_chunked_filter_module = {
    NGX_MODULE_V1,
    &ngx_http_chunked_filter_module_ctx,   /* module context */
    NULL,                                  /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static ngx_http_output_header_filter_pt  ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt    ngx_http_next_body_filter;


static ngx_int_t
ngx_http_chunked_header_filter(ngx_http_request_t *r)
{
    ngx_http_core_loc_conf_t       *clcf;
    ngx_http_chunked_filter_ctx_t  *ctx;

    if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
        || r->headers_out.status == NGX_HTTP_NO_CONTENT
        || r->headers_out.status < NGX_HTTP_OK
        || r != r->main
        || r->method == NGX_HTTP_HEAD)
    {
        return ngx_http_next_header_filter(r);
    }

    if (r->headers_out.content_length_n == -1
        || r->expect_trailers)
    {
        clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

        if (r->http_version >= NGX_HTTP_VERSION_11
            && clcf->chunked_transfer_encoding)
        {
            if (r->expect_trailers) {
                ngx_http_clear_content_length(r);
            }

            r->chunked = 1;

            ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_chunked_filter_ctx_t));
            if (ctx == NULL) {
                return NGX_ERROR;
            }

            ngx_http_set_ctx(r, ctx, ngx_http_chunked_filter_module);

        } else if (r->headers_out.content_length_n == -1) {
            r->keepalive = 0;
        }
    }

    return ngx_http_next_header_filter(r);
}


static ngx_int_t
ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
    u_char                         *chunk;
    off_t                           size;
    ngx_int_t                       rc;
    ngx_buf_t                      *b;
    ngx_chain_t                    *out, *cl, *tl, **ll;
    ngx_http_chunked_filter_ctx_t  *ctx;

    if (in == NULL || !r->chunked || r->header_only) {
        return ngx_http_next_body_filter(r, in);
    }

    ctx = ngx_http_get_module_ctx(r, ngx_http_chunked_filter_module);

    out = NULL;
    ll = &out;

    size = 0;
    cl = in;

    for ( ;; ) {
        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "http chunk: %O", ngx_buf_size(cl->buf));

        size += ngx_buf_size(cl->buf);

        if (cl->buf->flush
            || cl->buf->sync
            || ngx_buf_in_memory(cl->buf)
            || cl->buf->in_file)
        {
            tl = ngx_alloc_chain_link(r->pool);
            if (tl == NULL) {
                return NGX_ERROR;
            }

            tl->buf = cl->buf;
            *ll = tl;
            ll = &tl->next;
        }

        if (cl->next == NULL) {
            break;
        }

        cl = cl->next;
    }

    if (size) {
        tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
        if (tl == NULL) {
            return NGX_ERROR;
        }

        b = tl->buf;
        chunk = b->start;

        if (chunk == NULL) {
            /* the "0000000000000000" is 64-bit hexadecimal string */

            chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
            if (chunk == NULL) {
                return NGX_ERROR;
            }

            b->start = chunk;
            b->end = chunk + sizeof("0000000000000000" CRLF) - 1;
        }

        b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
        b->memory = 0;
        b->temporary = 1;
        b->pos = chunk;
        b->last = ngx_sprintf(chunk, "%xO" CRLF, size);

        tl->next = out;
        out = tl;
    }

    if (cl->buf->last_buf) {
        tl = ngx_http_chunked_create_trailers(r, ctx);
        if (tl == NULL) {
            return NGX_ERROR;
        }

        cl->buf->last_buf = 0;

        *ll = tl;

        if (size == 0) {
            tl->buf->pos += 2;
        }

    } else if (size > 0) {
        tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
        if (tl == NULL) {
            return NGX_ERROR;
        }

        b = tl->buf;

        b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
        b->temporary = 0;
        b->memory = 1;
        b->pos = (u_char *) CRLF;
        b->last = b->pos + 2;

        *ll = tl;

    } else {
        *ll = NULL;
    }

    rc = ngx_http_next_body_filter(r, out);

    ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out,
                            (ngx_buf_tag_t) &ngx_http_chunked_filter_module);

    return rc;
}


static ngx_chain_t *
ngx_http_chunked_create_trailers(ngx_http_request_t *r,
    ngx_http_chunked_filter_ctx_t *ctx)
{
    size_t            len;
    ngx_buf_t        *b;
    ngx_uint_t        i;
    ngx_chain_t      *cl;
    ngx_list_part_t  *part;
    ngx_table_elt_t  *header;

    len = 0;

    part = &r->headers_out.trailers.part;
    header = part->elts;

    for (i = 0; /* void */; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }

            part = part->next;
            header = part->elts;
            i = 0;
        }

        if (header[i].hash == 0) {
            continue;
        }

        len += header[i].key.len + sizeof(": ") - 1
               + header[i].value.len + sizeof(CRLF) - 1;
    }

    cl = ngx_chain_get_free_buf(r->pool, &ctx->free);
    if (cl == NULL) {
        return NULL;
    }

    b = cl->buf;

    b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
    b->temporary = 0;
    b->memory = 1;
    b->last_buf = 1;

    if (len == 0) {
        b->pos = (u_char *) CRLF "0" CRLF CRLF;
        b->last = b->pos + sizeof(CRLF "0" CRLF CRLF) - 1;
        return cl;
    }

    len += sizeof(CRLF "0" CRLF CRLF) - 1;

    b->pos = ngx_palloc(r->pool, len);
    if (b->pos == NULL) {
        return NULL;
    }

    b->last = b->pos;

    *b->last++ = CR; *b->last++ = LF;
    *b->last++ = '0';
    *b->last++ = CR; *b->last++ = LF;

    part = &r->headers_out.trailers.part;
    header = part->elts;

    for (i = 0; /* void */; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }

            part = part->next;
            header = part->elts;
            i = 0;
        }

        if (header[i].hash == 0) {
            continue;
        }

        ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "http trailer: \"%V: %V\"",
                       &header[i].key, &header[i].value);

        b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
        *b->last++ = ':'; *b->last++ = ' ';

        b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
        *b->last++ = CR; *b->last++ = LF;
    }

    *b->last++ = CR; *b->last++ = LF;

    return cl;
}


static ngx_int_t
ngx_http_chunked_filter_init(ngx_conf_t *cf)
{
    ngx_http_next_header_filter = ngx_http_top_header_filter;
    ngx_http_top_header_filter = ngx_http_chunked_header_filter;

    ngx_http_next_body_filter = ngx_http_top_body_filter;
    ngx_http_top_body_filter = ngx_http_chunked_body_filter;

    return NGX_OK;
}