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lighttpd1.4/src/mod_deflate.c

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/* mod_deflate
*
*
* bug fix on Robert Jakabosky from alphatrade.com's lighttp 1.4.10 mod_deflate patch
*
* Bug fix and new features:
* 1) fix loop bug when content-length is bigger than work-block-size*k
*
* -------
*
* lighttpd-1.4.26.mod_deflate.patch from
* https://redmine.lighttpd.net/projects/1/wiki/Docs_ModDeflate
*
* -------
*
* Patch further modified in this incarnation.
*
* Note: this patch only handles completed responses
* (r->resp_body_finished)
* this patch does not currently handle streaming dynamic responses,
* and therefore also does not worry about Transfer-Encoding: chunked
* (or having separate con->output_queue for chunked-encoded output)
* (or using separate buffers per connection instead of p->tmp_buf)
* (or handling interactions with block buffering and write timeouts)
*
* Bug fix:
* - fixed major bug with compressing chunks with offset > 0
* x-ref:
* "Response breaking in mod_deflate"
* https://redmine.lighttpd.net/issues/986
* - fix broken (in some cases) chunk accounting in deflate_compress_response()
* - fix broken bzip2
* x-ref:
* "mod_deflate's bzip2 broken by default"
* https://redmine.lighttpd.net/issues/2035
* - fix mismatch with current chunk interfaces
* x-ref:
* "Weird things in chunk.c (functions only handling specific cases, unexpected behaviour)"
* https://redmine.lighttpd.net/issues/1510
*
* Behavior changes from prior patch:
* - deflate.mimetypes must now be configured to enable compression
* deflate.mimetypes = ( ) # compress nothing (disabled; default)
* deflate.mimetypes = ( "" ) # compress all mimetypes
* deflate.mimetypes = ( "text/" ) # compress text/... mimetypes
* x-ref:
* "mod_deflate enabled by default"
* https://redmine.lighttpd.net/issues/1394
* - deflate.enabled directive removed (see new behavior of deflate.mimetypes)
* - deflate.debug removed (was developer debug trace, not end-user debug)
* - deflate.bzip2 replaced with deflate.allowed-encodings (like mod_compress)
* x-ref:
* "mod_deflate should allow limiting of compression algorithm from the configuration file"
* https://redmine.lighttpd.net/issues/996
* "mod_compress disabling methods"
* https://redmine.lighttpd.net/issues/1773
* - deflate.nocompress-url removed since disabling compression for a URL
* can now easily be done by setting to a blank list either directive
* deflate.accept_encodings = () or deflate.mimetypes = () in a conditional
* block, e.g. $HTTP["url"] =~ "....." { deflate.mimetypes = ( ) }
* - deflate.sync-flush removed; controlled by r->conf.stream_response_body
* (though streaming compression not currently implemented in mod_deflate)
* - inactive directives in this patch
* (since r->resp_body_finished required)
* deflate.work-block-size
* deflate.output-buffer-size
* - remove weak file size check; SIGBUS is trapped, file that shrink will error
* x-ref:
* "mod_deflate: filesize check is too weak"
* https://redmine.lighttpd.net/issues/1512
* - change default deflate.min-compress-size from 0 to now be 256
* http://webmasters.stackexchange.com/questions/31750/what-is-recommended-minimum-object-size-for-gzip-performance-benefits
* Apache 2.4 mod_deflate minimum is 68 bytes
* Akamai recommends minimum 860 bytes
* Google recommends minimum be somewhere in range between 150 and 1024 bytes
* - deflate.max-compress-size new directive (in kb like compress.max_filesize)
* - deflate.mem-level removed (too many knobs for little benefit)
* - deflate.window-size removed (too many knobs for little benefit)
*
* Future:
* - config directives may be changed, renamed, or removed
* e.g. A set of reasonable defaults might be chosen
* instead of making them configurable.
* deflate.min-compress-size
* - might add deflate.mimetypes-exclude = ( ... ) for list of mimetypes
* to avoid compressing, even if a broader deflate.mimetypes matched,
* e.g. to compress all "text/" except "text/special".
* - mod_compress and mod_deflate might merge overlapping feature sets
* (mod_compress.cache-dir does not yet have an equivalent in mod_deflate)
*
* Implementation notes:
* - http_chunk_append_mem() used instead of http_chunk_append_buffer()
* so that p->tmp_buf can be large and re-used. This results in an extra copy
* of compressed data before data is sent to network, though if the compressed
* size is larger than 64k, it ends up being sent to a temporary file on
* disk without suffering an extra copy in memory, and without extra chunk
* create and destroy. If this is ever changed to give away buffers, then use
* a unique hctx->output buffer per hctx; do not reuse p->tmp_buf across
* multiple requests being handled in parallel.
*/
#include "first.h"
#include <sys/types.h>
#include <sys/stat.h>
#include "sys-mmap.h"
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <unistd.h> /* read() */
#include "base.h"
#include "fdevent.h"
#include "log.h"
#include "buffer.h"
#include "etag.h"
#include "http_chunk.h"
#include "http_header.h"
#include "response.h"
#include "plugin.h"
#if defined HAVE_ZLIB_H && defined HAVE_LIBZ
# define USE_ZLIB
# include <zlib.h>
#endif
#ifndef Z_DEFAULT_COMPRESSION
#define Z_DEFAULT_COMPRESSION -1
#endif
#ifndef MAX_WBITS
#define MAX_WBITS 15
#endif
#if defined HAVE_BZLIB_H && defined HAVE_LIBBZ2
# define USE_BZ2LIB
/* we don't need stdio interface */
# define BZ_NO_STDIO
# include <bzlib.h>
#endif
#if defined HAVE_SYS_MMAN_H && defined HAVE_MMAP && defined ENABLE_MMAP
#define USE_MMAP
#include "sys-mmap.h"
#include <setjmp.h>
#include <signal.h>
static volatile int sigbus_jmp_valid;
static sigjmp_buf sigbus_jmp;
static void sigbus_handler(int sig) {
UNUSED(sig);
if (sigbus_jmp_valid) siglongjmp(sigbus_jmp, 1);
log_failed_assert(__FILE__, __LINE__, "SIGBUS");
}
#endif
/* request: accept-encoding */
#define HTTP_ACCEPT_ENCODING_IDENTITY BV(0)
#define HTTP_ACCEPT_ENCODING_GZIP BV(1)
#define HTTP_ACCEPT_ENCODING_DEFLATE BV(2)
#define HTTP_ACCEPT_ENCODING_COMPRESS BV(3)
#define HTTP_ACCEPT_ENCODING_BZIP2 BV(4)
#define HTTP_ACCEPT_ENCODING_X_GZIP BV(5)
#define HTTP_ACCEPT_ENCODING_X_BZIP2 BV(6)
#define KByte * 1024
#define MByte * 1024 KByte
#define GByte * 1024 MByte
typedef struct {
const array *mimetypes;
unsigned int max_compress_size;
unsigned short min_compress_size;
unsigned short output_buffer_size;
unsigned short work_block_size;
unsigned short sync_flush;
short compression_level;
short allowed_encodings;
double max_loadavg;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
buffer tmp_buf;
} plugin_data;
typedef struct {
union {
#ifdef USE_ZLIB
z_stream z;
#endif
#ifdef USE_BZ2LIB
bz_stream bz;
#endif
int dummy;
} u;
off_t bytes_in;
off_t bytes_out;
chunkqueue *in_queue;
buffer *output;
plugin_data *plugin_data;
int compression_type;
log_error_st *errh;
} handler_ctx;
static handler_ctx *handler_ctx_init() {
handler_ctx *hctx;
hctx = calloc(1, sizeof(*hctx));
hctx->in_queue = chunkqueue_init();
return hctx;
}
static void handler_ctx_free(handler_ctx *hctx) {
#if 0
if (hctx->output != &p->tmp_buf) {
buffer_free(hctx->output);
}
#endif
chunkqueue_free(hctx->in_queue);
free(hctx);
}
INIT_FUNC(mod_deflate_init) {
plugin_data * const p = calloc(1, sizeof(plugin_data));
buffer_string_prepare_copy(&p->tmp_buf, 64 KByte);
return p;
}
FREE_FUNC(mod_deflate_free) {
plugin_data *p = p_d;
free(p->tmp_buf.ptr);
}
static void mod_deflate_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* deflate.mimetypes */
pconf->mimetypes = cpv->v.a;
break;
case 1: /* deflate.allowed-encodings */
pconf->allowed_encodings = (short)cpv->v.shrt;
break;
case 2: /* deflate.max-compress-size */
pconf->max_compress_size = cpv->v.u;
break;
case 3: /* deflate.min-compress-size */
pconf->min_compress_size = cpv->v.shrt;
break;
case 4: /* deflate.compression-level */
pconf->compression_level = (short)cpv->v.shrt;
break;
case 5: /* deflate.output-buffer-size */
pconf->output_buffer_size = cpv->v.shrt;
break;
case 6: /* deflate.work-block-size */
pconf->work_block_size = cpv->v.shrt;
break;
case 7: /* deflate.max-loadavg */
pconf->max_loadavg = cpv->v.d;
break;
default:/* should not happen */
return;
}
}
static void mod_deflate_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_deflate_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_deflate_patch_config(request_st * const r, plugin_data * const p) {
memcpy(&p->conf, &p->defaults, sizeof(plugin_config));
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_deflate_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
}
}
static short mod_deflate_encodings_to_flags(const array *encodings) {
short allowed_encodings = 0;
if (encodings->used) {
for (uint32_t j = 0; j < encodings->used; ++j) {
#if defined(USE_ZLIB) || defined(USE_BZ2LIB)
data_string *ds = (data_string *)encodings->data[j];
#endif
#ifdef USE_ZLIB
if (NULL != strstr(ds->value.ptr, "gzip"))
allowed_encodings |= HTTP_ACCEPT_ENCODING_GZIP
| HTTP_ACCEPT_ENCODING_X_GZIP;
if (NULL != strstr(ds->value.ptr, "x-gzip"))
allowed_encodings |= HTTP_ACCEPT_ENCODING_X_GZIP;
if (NULL != strstr(ds->value.ptr, "deflate"))
allowed_encodings |= HTTP_ACCEPT_ENCODING_DEFLATE;
/*
if (NULL != strstr(ds->value.ptr, "compress"))
allowed_encodings |= HTTP_ACCEPT_ENCODING_COMPRESS;
*/
#endif
#ifdef USE_BZ2LIB
if (NULL != strstr(ds->value.ptr, "bzip2"))
allowed_encodings |= HTTP_ACCEPT_ENCODING_BZIP2
| HTTP_ACCEPT_ENCODING_X_BZIP2;
if (NULL != strstr(ds->value.ptr, "x-bzip2"))
allowed_encodings |= HTTP_ACCEPT_ENCODING_X_BZIP2;
#endif
}
}
else {
/* default encodings */
#ifdef USE_ZLIB
allowed_encodings |= HTTP_ACCEPT_ENCODING_GZIP
| HTTP_ACCEPT_ENCODING_X_GZIP
| HTTP_ACCEPT_ENCODING_DEFLATE;
#endif
#ifdef USE_BZ2LIB
allowed_encodings |= HTTP_ACCEPT_ENCODING_BZIP2
| HTTP_ACCEPT_ENCODING_X_BZIP2;
#endif
}
return allowed_encodings;
}
SETDEFAULTS_FUNC(mod_deflate_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("deflate.mimetypes"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.allow-encodings"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.max-compress-size"),
T_CONFIG_INT,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.min-compress-size"),
T_CONFIG_SHORT,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.compression-level"),
T_CONFIG_SHORT,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.output-buffer-size"),
T_CONFIG_SHORT,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.work-block-size"),
T_CONFIG_SHORT,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("deflate.max-loadavg"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_deflate"))
return HANDLER_ERROR;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* deflate.mimetypes */
/* mod_deflate matches mimetype as prefix of Content-Type
* so ignore '*' at end of mimetype for end-user flexibility
* in specifying trailing wildcard to grouping of mimetypes */
for (uint32_t m = 0; m < cpv->v.a->used; ++m) {
buffer *mimetype=&((data_string *)cpv->v.a->data[m])->value;
size_t len = buffer_string_length(mimetype);
if (len > 2 && mimetype->ptr[len-1] == '*')
buffer_string_set_length(mimetype, len-1);
}
if (0 == cpv->v.a->used) cpv->v.a = NULL;
break;
case 1: /* deflate.allowed-encodings */
cpv->v.shrt = (unsigned short)
mod_deflate_encodings_to_flags(cpv->v.a);
cpv->vtype = T_CONFIG_SHORT;
break;
case 2: /* deflate.max-compress-size */
case 3: /* deflate.min-compress-size */
break;
case 4: /* deflate.compression-level */
if ((cpv->v.shrt < 1 || cpv->v.shrt > 9)
&& *(short *)&cpv->v.shrt != -1) {
log_error(srv->errh, __FILE__, __LINE__,
"compression-level must be between 1 and 9: %hu",
cpv->v.shrt);
return HANDLER_ERROR;
}
break;
case 5: /* deflate.output-buffer-size */
case 6: /* deflate.work-block-size */
break;
case 7: /* deflate.max-loadavg */
cpv->v.d = (!buffer_string_is_empty(cpv->v.b))
? strtod(cpv->v.b->ptr, NULL)
: 0.0;
break;
default:/* should not happen */
break;
}
}
}
p->defaults.allowed_encodings = 0;
p->defaults.max_compress_size = 128*1024; /*(128 MB measured as num KB)*/
p->defaults.min_compress_size = 256;
p->defaults.compression_level = -1;
p->defaults.output_buffer_size = 0;
p->defaults.work_block_size = 2048;
p->defaults.max_loadavg = 0.0;
p->defaults.sync_flush = 0;
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_deflate_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
#if defined(USE_ZLIB) || defined(USE_BZ2LIB)
static int stream_http_chunk_append_mem(request_st * const r, const handler_ctx * const hctx, size_t len) {
/* future: might also write stream to hctx temporary file in compressed file cache */
return http_chunk_append_mem(r, hctx->output->ptr, len);
}
#endif
#ifdef USE_ZLIB
static int stream_deflate_init(handler_ctx *hctx) {
z_stream * const z = &hctx->u.z;
const plugin_data * const p = hctx->plugin_data;
z->zalloc = Z_NULL;
z->zfree = Z_NULL;
z->opaque = Z_NULL;
z->total_in = 0;
z->total_out = 0;
z->next_out = (unsigned char *)hctx->output->ptr;
z->avail_out = hctx->output->size;
if (Z_OK != deflateInit2(z,
p->conf.compression_level > 0
? p->conf.compression_level
: Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
(hctx->compression_type == HTTP_ACCEPT_ENCODING_GZIP)
? (MAX_WBITS | 16) /*(0x10 flags gzip header, trailer)*/
: -MAX_WBITS, /*(negate to suppress zlib header)*/
8, /* default memLevel */
Z_DEFAULT_STRATEGY)) {
return -1;
}
return 0;
}
static int stream_deflate_compress(request_st * const r, handler_ctx * const hctx, unsigned char * const start, off_t st_size) {
z_stream * const z = &(hctx->u.z);
size_t len;
z->next_in = start;
z->avail_in = st_size;
hctx->bytes_in += st_size;
/* compress data */
do {
if (Z_OK != deflate(z, Z_NO_FLUSH)) return -1;
if (z->avail_out == 0 || z->avail_in > 0) {
len = hctx->output->size - z->avail_out;
hctx->bytes_out += len;
stream_http_chunk_append_mem(r, hctx, len);
z->next_out = (unsigned char *)hctx->output->ptr;
z->avail_out = hctx->output->size;
}
} while (z->avail_in > 0);
return 0;
}
static int stream_deflate_flush(request_st * const r, handler_ctx * const hctx, int end) {
z_stream * const z = &(hctx->u.z);
const plugin_data *p = hctx->plugin_data;
size_t len;
int rc = 0;
int done;
/* compress data */
do {
done = 1;
if (end) {
rc = deflate(z, Z_FINISH);
if (rc == Z_OK) {
done = 0;
} else if (rc != Z_STREAM_END) {
return -1;
}
} else {
if (p->conf.sync_flush) {
rc = deflate(z, Z_SYNC_FLUSH);
if (rc != Z_OK) return -1;
} else if (z->avail_in > 0) {
rc = deflate(z, Z_NO_FLUSH);
if (rc != Z_OK) return -1;
}
}
len = hctx->output->size - z->avail_out;
if (z->avail_out == 0 || (len > 0 && (end || p->conf.sync_flush))) {
hctx->bytes_out += len;
stream_http_chunk_append_mem(r, hctx, len);
z->next_out = (unsigned char *)hctx->output->ptr;
z->avail_out = hctx->output->size;
}
} while (z->avail_in != 0 || !done);
return 0;
}
static int stream_deflate_end(handler_ctx *hctx) {
z_stream * const z = &(hctx->u.z);
int rc = deflateEnd(z);
if (Z_OK == rc || Z_DATA_ERROR == rc) return 0;
if (z->msg != NULL) {
log_error(hctx->errh, __FILE__, __LINE__,
"deflateEnd error ret=%d, msg=%s", rc, z->msg);
} else {
log_error(hctx->errh, __FILE__, __LINE__,
"deflateEnd error ret=%d", rc);
}
return -1;
}
#endif
#ifdef USE_BZ2LIB
static int stream_bzip2_init(handler_ctx *hctx) {
bz_stream * const bz = &hctx->u.bz;
const plugin_data * const p = hctx->plugin_data;
bz->bzalloc = NULL;
bz->bzfree = NULL;
bz->opaque = NULL;
bz->total_in_lo32 = 0;
bz->total_in_hi32 = 0;
bz->total_out_lo32 = 0;
bz->total_out_hi32 = 0;
bz->next_out = hctx->output->ptr;
bz->avail_out = hctx->output->size;
if (BZ_OK != BZ2_bzCompressInit(bz,
p->conf.compression_level > 0
? p->conf.compression_level
: 9, /* blocksize = 900k */
0, /* verbosity */
0)) { /* workFactor: default */
return -1;
}
return 0;
}
static int stream_bzip2_compress(request_st * const r, handler_ctx * const hctx, unsigned char * const start, off_t st_size) {
bz_stream * const bz = &(hctx->u.bz);
size_t len;
bz->next_in = (char *)start;
bz->avail_in = st_size;
hctx->bytes_in += st_size;
/* compress data */
do {
if (BZ_RUN_OK != BZ2_bzCompress(bz, BZ_RUN)) return -1;
if (bz->avail_out == 0 || bz->avail_in > 0) {
len = hctx->output->size - bz->avail_out;
hctx->bytes_out += len;
stream_http_chunk_append_mem(r, hctx, len);
bz->next_out = hctx->output->ptr;
bz->avail_out = hctx->output->size;
}
} while (bz->avail_in > 0);
return 0;
}
static int stream_bzip2_flush(request_st * const r, handler_ctx * const hctx, int end) {
bz_stream * const bz = &(hctx->u.bz);
const plugin_data *p = hctx->plugin_data;
size_t len;
int rc;
int done;
/* compress data */
do {
done = 1;
if (end) {
rc = BZ2_bzCompress(bz, BZ_FINISH);
if (rc == BZ_FINISH_OK) {
done = 0;
} else if (rc != BZ_STREAM_END) {
return -1;
}
} else if (bz->avail_in > 0) {
/* p->conf.sync_flush not implemented here,
* which would loop on BZ_FLUSH while BZ_FLUSH_OK
* until BZ_RUN_OK returned */
rc = BZ2_bzCompress(bz, BZ_RUN);
if (rc != BZ_RUN_OK) {
return -1;
}
}
len = hctx->output->size - bz->avail_out;
if (bz->avail_out == 0 || (len > 0 && (end || p->conf.sync_flush))) {
hctx->bytes_out += len;
stream_http_chunk_append_mem(r, hctx, len);
bz->next_out = hctx->output->ptr;
bz->avail_out = hctx->output->size;
}
} while (bz->avail_in != 0 || !done);
return 0;
}
static int stream_bzip2_end(handler_ctx *hctx) {
bz_stream * const bz = &(hctx->u.bz);
int rc = BZ2_bzCompressEnd(bz);
if (BZ_OK == rc || BZ_DATA_ERROR == rc) return 0;
log_error(hctx->errh, __FILE__, __LINE__,
"BZ2_bzCompressEnd error ret=%d", rc);
return -1;
}
#endif
static int mod_deflate_stream_init(handler_ctx *hctx) {
switch(hctx->compression_type) {
#ifdef USE_ZLIB
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_DEFLATE:
return stream_deflate_init(hctx);
#endif
#ifdef USE_BZ2LIB
case HTTP_ACCEPT_ENCODING_BZIP2:
return stream_bzip2_init(hctx);
#endif
default:
return -1;
}
}
static int mod_deflate_compress(request_st * const r, handler_ctx * const hctx, unsigned char * const start, off_t st_size) {
if (0 == st_size) return 0;
switch(hctx->compression_type) {
#ifdef USE_ZLIB
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_DEFLATE:
return stream_deflate_compress(r, hctx, start, st_size);
#endif
#ifdef USE_BZ2LIB
case HTTP_ACCEPT_ENCODING_BZIP2:
return stream_bzip2_compress(r, hctx, start, st_size);
#endif
default:
UNUSED(r);
UNUSED(start);
return -1;
}
}
static int mod_deflate_stream_flush(request_st * const r, handler_ctx * const hctx, int end) {
if (0 == hctx->bytes_in) return 0;
switch(hctx->compression_type) {
#ifdef USE_ZLIB
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_DEFLATE:
return stream_deflate_flush(r, hctx, end);
#endif
#ifdef USE_BZ2LIB
case HTTP_ACCEPT_ENCODING_BZIP2:
return stream_bzip2_flush(r, hctx, end);
#endif
default:
UNUSED(r);
UNUSED(end);
return -1;
}
}
static void mod_deflate_note_ratio(request_st * const r, handler_ctx * const hctx) {
/* store compression ratio in environment
* for possible logging by mod_accesslog
* (late in response handling, so not seen by most other modules) */
/*(should be called only at end of successful response compression)*/
char ratio[LI_ITOSTRING_LENGTH];
if (0 == hctx->bytes_in) return;
size_t len =
li_itostrn(ratio, sizeof(ratio), hctx->bytes_out * 100 / hctx->bytes_in);
http_header_env_set(r, CONST_STR_LEN("ratio"), ratio, len);
}
static int mod_deflate_stream_end(handler_ctx *hctx) {
switch(hctx->compression_type) {
#ifdef USE_ZLIB
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_DEFLATE:
return stream_deflate_end(hctx);
#endif
#ifdef USE_BZ2LIB
case HTTP_ACCEPT_ENCODING_BZIP2:
return stream_bzip2_end(hctx);
#endif
default:
return -1;
}
}
static void deflate_compress_cleanup(request_st * const r, handler_ctx * const hctx) {
const plugin_data *p = hctx->plugin_data;
r->plugin_ctx[p->id] = NULL;
if (0 != mod_deflate_stream_end(hctx)) {
log_error(r->conf.errh, __FILE__, __LINE__, "error closing stream");
}
#if 1 /* unnecessary if deflate.min-compress-size is set to a reasonable value */
if (hctx->bytes_in < hctx->bytes_out) {
log_error(r->conf.errh, __FILE__, __LINE__,
"uri %s in=%lld smaller than out=%lld", r->target.ptr,
(long long)hctx->bytes_in, (long long)hctx->bytes_out);
}
#endif
handler_ctx_free(hctx);
}
static int mod_deflate_file_chunk(request_st * const r, handler_ctx * const hctx, chunk * const c, off_t st_size) {
off_t abs_offset;
off_t toSend = -1;
char *start;
#ifdef USE_MMAP
off_t we_want_to_mmap = 2 MByte;
off_t we_want_to_send = st_size;
volatile int mapped = 0;/* quiet warning: might be clobbered by 'longjmp' */
#else
start = NULL;
#endif
if (-1 == c->file.fd) { /* open the file if not already open */
if (-1 == (c->file.fd = fdevent_open_cloexec(c->mem->ptr, r->conf.follow_symlink, O_RDONLY, 0))) {
log_perror(r->conf.errh, __FILE__, __LINE__, "open failed %s", c->mem->ptr);
return -1;
}
}
abs_offset = c->file.start + c->offset;
#ifdef USE_MMAP
/* mmap the buffer
* - first mmap
* - new mmap as the we are at the end of the last one */
if (c->file.mmap.start == MAP_FAILED ||
abs_offset == (off_t)(c->file.mmap.offset + c->file.mmap.length)) {
/* Optimizations for the future:
*
* adaptive mem-mapping
* the problem:
* we mmap() the whole file. If someone has a lot of large files and 32bit
* machine the virtual address area will be exhausted and we will have a failing
* mmap() call.
* solution:
* only mmap 16M in one chunk and move the window as soon as we have finished
* the first 8M
*
* read-ahead buffering
* the problem:
* sending out several large files in parallel trashes the read-ahead of the
* kernel leading to long wait-for-seek times.
* solutions: (increasing complexity)
* 1. use madvise
* 2. use a internal read-ahead buffer in the chunk-structure
* 3. use non-blocking IO for file-transfers
* */
/* all mmap()ed areas are 512kb expect the last which might be smaller */
off_t to_mmap;
/* this is a remap, move the mmap-offset */
if (c->file.mmap.start != MAP_FAILED) {
munmap(c->file.mmap.start, c->file.mmap.length);
c->file.mmap.offset += we_want_to_mmap;
} else {
/* in case the range-offset is after the first mmap()ed area we skip the area */
c->file.mmap.offset = 0;
while (c->file.mmap.offset + we_want_to_mmap < c->file.start) {
c->file.mmap.offset += we_want_to_mmap;
}
}
/* length is rel, c->offset too, assume there is no limit at the mmap-boundaries */
to_mmap = (c->file.start + c->file.length) - c->file.mmap.offset;
if (to_mmap > we_want_to_mmap) to_mmap = we_want_to_mmap;
/* we have more to send than we can mmap() at once */
if (we_want_to_send > to_mmap) we_want_to_send = to_mmap;
if (MAP_FAILED == (c->file.mmap.start = mmap(0, (size_t)to_mmap, PROT_READ, MAP_SHARED, c->file.fd, c->file.mmap.offset))
&& (errno != EINVAL || MAP_FAILED == (c->file.mmap.start = mmap(0, (size_t)to_mmap, PROT_READ, MAP_PRIVATE, c->file.fd, c->file.mmap.offset)))) {
log_perror(r->conf.errh, __FILE__, __LINE__,
"mmap failed %s %d", c->mem->ptr, c->file.fd);
return -1;
}
c->file.mmap.length = to_mmap;
#ifdef HAVE_MADVISE
/* don't advise files < 64Kb */
if (c->file.mmap.length > (64 KByte) &&
0 != madvise(c->file.mmap.start, c->file.mmap.length, MADV_WILLNEED)) {
log_perror(r->conf.errh, __FILE__, __LINE__,
"madvise failed %s %d", c->mem->ptr, c->file.fd);
}
#endif
/* chunk_reset() or chunk_free() will cleanup for us */
}
/* to_send = abs_mmap_end - abs_offset */
toSend = (c->file.mmap.offset + c->file.mmap.length) - abs_offset;
if (toSend > we_want_to_send) toSend = we_want_to_send;
if (toSend < 0) {
log_error(r->conf.errh, __FILE__, __LINE__,
"toSend is negative: %lld %lld %lld %lld",
(long long)toSend,
(long long)c->file.mmap.length,
(long long)abs_offset,
(long long)c->file.mmap.offset);
force_assert(toSend < 0);
}
start = c->file.mmap.start;
mapped = 1;
#endif
if (MAP_FAILED == c->file.mmap.start) {
toSend = st_size;
if (toSend > 2 MByte) toSend = 2 MByte;
if (NULL == (start = malloc((size_t)toSend)) || -1 == lseek(c->file.fd, abs_offset, SEEK_SET) || toSend != read(c->file.fd, start, (size_t)toSend)) {
log_perror(r->conf.errh, __FILE__, __LINE__, "reading %s failed", c->mem->ptr);
free(start);
return -1;
}
abs_offset = 0;
}
#ifdef USE_MMAP
if (mapped) {
signal(SIGBUS, sigbus_handler);
sigbus_jmp_valid = 1;
if (0 != sigsetjmp(sigbus_jmp, 1)) {
sigbus_jmp_valid = 0;
log_error(r->conf.errh, __FILE__, __LINE__,
"SIGBUS in mmap: %s %d", c->mem->ptr, c->file.fd);
return -1;
}
}
#endif
if (mod_deflate_compress(r, hctx,
(unsigned char *)start + (abs_offset - c->file.mmap.offset), toSend) < 0) {
log_error(r->conf.errh, __FILE__, __LINE__, "compress failed.");
toSend = -1;
}
#ifdef USE_MMAP
if (mapped)
sigbus_jmp_valid = 0;
else
#endif
free(start);
return toSend;
}
static handler_t deflate_compress_response(request_st * const r, handler_ctx * const hctx) {
off_t len, max;
int close_stream;
/* move all chunk from write_queue into our in_queue, then adjust
* counters since r->write_queue is reused for compressed output */
chunkqueue * const cq = r->write_queue;
len = chunkqueue_length(cq);
chunkqueue_remove_finished_chunks(cq);
chunkqueue_append_chunkqueue(hctx->in_queue, cq);
cq->bytes_in -= len;
cq->bytes_out -= len;
max = chunkqueue_length(hctx->in_queue);
#if 0
/* calculate max bytes to compress for this call */
if (p->conf.sync_flush && max > (len = p->conf.work_block_size << 10)) {
max = len;
}
#endif
/* Compress chunks from in_queue into chunks for write_queue */
while (max) {
chunk *c = hctx->in_queue->first;
switch(c->type) {
case MEM_CHUNK:
len = buffer_string_length(c->mem) - c->offset;
if (len > max) len = max;
if (mod_deflate_compress(r, hctx, (unsigned char *)c->mem->ptr+c->offset, len) < 0) {
log_error(r->conf.errh, __FILE__, __LINE__, "compress failed.");
return HANDLER_ERROR;
}
break;
case FILE_CHUNK:
len = c->file.length - c->offset;
if (len > max) len = max;
if ((len = mod_deflate_file_chunk(r, hctx, c, len)) < 0) {
log_error(r->conf.errh, __FILE__, __LINE__, "compress file chunk failed.");
return HANDLER_ERROR;
}
break;
default:
log_error(r->conf.errh, __FILE__, __LINE__, "%d type not known", c->type);
return HANDLER_ERROR;
}
max -= len;
chunkqueue_mark_written(hctx->in_queue, len);
}
/*(currently should always be true)*/
/*(current implementation requires response be complete)*/
close_stream = (r->resp_body_finished
&& chunkqueue_is_empty(hctx->in_queue));
if (mod_deflate_stream_flush(r, hctx, close_stream) < 0) {
log_error(r->conf.errh, __FILE__, __LINE__, "flush error");
return HANDLER_ERROR;
}
return close_stream ? HANDLER_FINISHED : HANDLER_GO_ON;
}
static int mod_deflate_choose_encoding (const char *value, plugin_data *p, const char **label) {
/* get client side support encodings */
int accept_encoding = 0;
#if !defined(USE_ZLIB) && !defined(USE_BZ2LIB)
UNUSED(value);
#else
for (; *value; ++value) {
const char *v;
while (*value == ' ' || *value == ',') ++value;
v = value;
while (*value!=' ' && *value!=',' && *value!=';' && *value!='\0')
++value;
switch (value - v) {
case 4:
#ifdef USE_ZLIB
if (0 == memcmp(v, "gzip", 4))
accept_encoding |= HTTP_ACCEPT_ENCODING_GZIP;
#endif
break;
case 5:
#ifdef USE_BZ2LIB
if (0 == memcmp(v, "bzip2", 5))
accept_encoding |= HTTP_ACCEPT_ENCODING_BZIP2;
#endif
break;
case 6:
#ifdef USE_ZLIB
if (0 == memcmp(v, "x-gzip", 6))
accept_encoding |= HTTP_ACCEPT_ENCODING_X_GZIP;
#endif
break;
case 7:
#ifdef USE_ZLIB
if (0 == memcmp(v, "deflate", 7))
accept_encoding |= HTTP_ACCEPT_ENCODING_DEFLATE;
#endif
#ifdef USE_BZ2LIB
if (0 == memcmp(v, "x-bzip2", 7))
accept_encoding |= HTTP_ACCEPT_ENCODING_X_BZIP2;
#endif
break;
#if 0
case 8:
if (0 == memcmp(v, "identity", 8))
accept_encoding |= HTTP_ACCEPT_ENCODING_IDENTITY;
else if (0 == memcmp(v, "compress", 8))
accept_encoding |= HTTP_ACCEPT_ENCODING_COMPRESS;
break;
#endif
default:
break;
}
if (*value == ';') {
while (*value != ',' && *value != '\0') ++value;
}
if (*value == '\0') break;
}
#endif
/* mask to limit to allowed_encodings */
accept_encoding &= p->conf.allowed_encodings;
/* select best matching encoding */
#ifdef USE_BZ2LIB
if (accept_encoding & HTTP_ACCEPT_ENCODING_BZIP2) {
*label = "bzip2";
return HTTP_ACCEPT_ENCODING_BZIP2;
} else if (accept_encoding & HTTP_ACCEPT_ENCODING_X_BZIP2) {
*label = "x-bzip2";
return HTTP_ACCEPT_ENCODING_BZIP2;
} else
#endif
#ifdef USE_ZLIB
if (accept_encoding & HTTP_ACCEPT_ENCODING_GZIP) {
*label = "gzip";
return HTTP_ACCEPT_ENCODING_GZIP;
} else if (accept_encoding & HTTP_ACCEPT_ENCODING_X_GZIP) {
*label = "x-gzip";
return HTTP_ACCEPT_ENCODING_GZIP;
} else if (accept_encoding & HTTP_ACCEPT_ENCODING_DEFLATE) {
*label = "deflate";
return HTTP_ACCEPT_ENCODING_DEFLATE;
} else
#endif
if (0 == accept_encoding) {
return 0;
} else {
return 0;
}
}
REQUEST_FUNC(mod_deflate_handle_response_start) {
plugin_data *p = p_d;
const buffer *vbro;
buffer *vb;
handler_ctx *hctx;
const char *label;
off_t len;
size_t etaglen = 0;
int compression_type;
handler_t rc;
/*(current implementation requires response be complete)*/
if (!r->resp_body_finished) return HANDLER_GO_ON;
if (r->http_method == HTTP_METHOD_HEAD) return HANDLER_GO_ON;
if (r->resp_htags & HTTP_HEADER_TRANSFER_ENCODING) return HANDLER_GO_ON;
/* disable compression for some http status types. */
switch(r->http_status) {
case 100:
case 101:
case 204:
case 205:
case 304:
/* disable compression as we have no response entity */
return HANDLER_GO_ON;
default:
break;
}
mod_deflate_patch_config(r, p);
/* check if deflate configured for any mimetypes */
if (NULL == p->conf.mimetypes) return HANDLER_GO_ON;
/* check if size of response is below min-compress-size or exceeds max*/
/* (r->resp_body_finished checked at top of routine) */
len = chunkqueue_length(r->write_queue);
if (len <= (off_t)p->conf.min_compress_size) return HANDLER_GO_ON;
if (p->conf.max_compress_size /*(max_compress_size in KB)*/
&& len > ((off_t)p->conf.max_compress_size << 10)) {
return HANDLER_GO_ON;
}
/* Check if response has a Content-Encoding. */
vbro = http_header_response_get(r, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding"));
if (NULL != vbro) return HANDLER_GO_ON;
/* Check Accept-Encoding for supported encoding. */
vbro = http_header_request_get(r, HTTP_HEADER_ACCEPT_ENCODING, CONST_STR_LEN("Accept-Encoding"));
if (NULL == vbro) return HANDLER_GO_ON;
/* find matching encodings */
compression_type = mod_deflate_choose_encoding(vbro->ptr, p, &label);
if (!compression_type) return HANDLER_GO_ON;
/* Check mimetype in response header "Content-Type" */
if (NULL != (vbro = http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type")))) {
if (NULL == array_match_value_prefix(p->conf.mimetypes, vbro)) return HANDLER_GO_ON;
} else {
/* If no Content-Type set, compress only if first p->conf.mimetypes value is "" */
data_string *mimetype = (data_string *)p->conf.mimetypes->data[0];
if (!buffer_string_is_empty(&mimetype->value)) return HANDLER_GO_ON;
}
/* Vary: Accept-Encoding (response might change according to request Accept-Encoding) */
if (NULL != (vb = http_header_response_get(r, HTTP_HEADER_VARY, CONST_STR_LEN("Vary")))) {
if (NULL == strstr(vb->ptr, "Accept-Encoding")) {
buffer_append_string_len(vb, CONST_STR_LEN(",Accept-Encoding"));
}
} else {
http_header_response_append(r, HTTP_HEADER_VARY,
CONST_STR_LEN("Vary"),
CONST_STR_LEN("Accept-Encoding"));
}
/* check ETag as is done in http_response_handle_cachable()
* (slightly imperfect (close enough?) match of ETag "000000" to "000000-gzip") */
vb = http_header_response_get(r, HTTP_HEADER_ETAG, CONST_STR_LEN("ETag"));
if (NULL != vb && (r->rqst_htags & HTTP_HEADER_IF_NONE_MATCH)) {
const buffer *if_none_match = http_header_response_get(r, HTTP_HEADER_IF_NONE_MATCH, CONST_STR_LEN("If-None-Match"));
etaglen = buffer_string_length(vb);
if (etaglen
&& r->http_status < 300 /*(want 2xx only)*/
&& NULL != if_none_match
&& 0 == strncmp(if_none_match->ptr, vb->ptr, etaglen-1)
&& if_none_match->ptr[etaglen-1] == '-'
&& 0 == strncmp(if_none_match->ptr+etaglen, label, strlen(label))) {
if (http_method_get_or_head(r->http_method)) {
/* modify ETag response header in-place to remove '"' and append '-label"' */
vb->ptr[etaglen-1] = '-'; /*(overwrite end '"')*/
buffer_append_string(vb, label);
buffer_append_string_len(vb, CONST_STR_LEN("\""));
/*buffer_copy_buffer(&r->physical.etag, vb);*//*(keep in sync?)*/
r->http_status = 304;
} else {
r->http_status = 412;
}
/* response_start hook occurs after error docs have been handled.
* For now, send back empty response body.
* In the future, might extract the error doc code so that it
* might be run again if response_start hooks return with
* changed http_status and r->handler_module = NULL */
/* clear content length even if 304 since compressed length unknown */
http_response_body_clear(r, 0);
r->resp_body_finished = 1;
r->handler_module = NULL;
return HANDLER_GO_ON;
}
}
if (0.0 < p->conf.max_loadavg && p->conf.max_loadavg < r->con->srv->loadavg[0]) {
return HANDLER_GO_ON;
}
/* update ETag, if ETag response header is set */
if (etaglen) {
/* modify ETag response header in-place to remove '"' and append '-label"' */
vb->ptr[etaglen-1] = '-'; /*(overwrite end '"')*/
buffer_append_string(vb, label);
buffer_append_string_len(vb, CONST_STR_LEN("\""));
/*buffer_copy_buffer(&r->physical.etag, vb);*//*(keep in sync?)*/
}
/* set Content-Encoding to show selected compression type */
http_header_response_set(r, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding"), label, strlen(label));
/* clear Content-Length and r->write_queue if HTTP HEAD request
* (alternatively, could return original Content-Length with HEAD
* request if ETag not modified and Content-Encoding not added) */
if (HTTP_METHOD_HEAD == r->http_method) {
/* ensure that uncompressed Content-Length is not sent in HEAD response */
http_response_body_clear(r, 0);
return HANDLER_GO_ON;
}
/* future: might use ETag to check if compressed content is in compressed file cache */
/*if (etaglen) { ... } *//* return if in file cache after updating r->write_queue */
/* enable compression */
p->conf.sync_flush =
(r->conf.stream_response_body && 0 == p->conf.output_buffer_size);
hctx = handler_ctx_init();
hctx->plugin_data = p;
hctx->compression_type = compression_type;
hctx->errh = r->conf.errh;
/* setup output buffer */
buffer_clear(&p->tmp_buf);
hctx->output = &p->tmp_buf;
if (0 != mod_deflate_stream_init(hctx)) {
/*(should not happen unless ENOMEM)*/
handler_ctx_free(hctx);
log_error(r->conf.errh, __FILE__, __LINE__,
"Failed to initialize compression %s", label);
/* restore prior Etag and unset Content-Encoding */
if (etaglen) {
vb->ptr[etaglen-1] = '"'; /*(overwrite '-')*/
buffer_string_set_length(vb, etaglen);
}
http_header_response_unset(r, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding"));
return HANDLER_GO_ON;
}
if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) {
http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length"));
}
r->plugin_ctx[p->id] = hctx;
rc = deflate_compress_response(r, hctx);
if (HANDLER_GO_ON != rc) {
if (HANDLER_FINISHED == rc) {
mod_deflate_note_ratio(r, hctx);
}
deflate_compress_cleanup(r, hctx);
if (HANDLER_ERROR == rc) return HANDLER_ERROR;
}
return HANDLER_GO_ON;
}
static handler_t mod_deflate_cleanup(request_st * const r, void *p_d) {
plugin_data *p = p_d;
handler_ctx *hctx = r->plugin_ctx[p->id];
if (NULL != hctx) deflate_compress_cleanup(r, hctx);
return HANDLER_GO_ON;
}
int mod_deflate_plugin_init(plugin *p);
int mod_deflate_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = "deflate";
p->init = mod_deflate_init;
p->cleanup = mod_deflate_free;
p->set_defaults = mod_deflate_set_defaults;
p->connection_reset = mod_deflate_cleanup;
p->handle_response_start = mod_deflate_handle_response_start;
return 0;
}
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