/* 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 (con->file_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 con->conf.stream_response_body * (though streaming compression not currently implemented in mod_deflate) * - inactive directives in this patch (since con->file_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 #include #include "sys-mmap.h" #include #include #include #include #include #include /* 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 #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 #endif #if defined HAVE_SYS_MMAN_H && defined HAVE_MMAP && defined ENABLE_MMAP #define USE_MMAP #include "sys-mmap.h" #include #include 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 { array *mimetypes; int allowed_encodings; 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; double max_loadavg; } plugin_config; typedef struct { PLUGIN_DATA; buffer *tmp_buf; array *encodings; plugin_config **config_storage; plugin_config conf; } 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; } 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 *p; p = calloc(1, sizeof(*p)); p->encodings = array_init(); p->tmp_buf = buffer_init(); buffer_string_prepare_copy(p->tmp_buf, 64 KByte); return p; } FREE_FUNC(mod_deflate_free) { plugin_data *p = p_d; UNUSED(srv); if (!p) return HANDLER_GO_ON; if (p->config_storage) { size_t i; for (i = 0; i < srv->config_context->used; i++) { plugin_config *s = p->config_storage[i]; if (!s) continue; array_free(s->mimetypes); free(s); } free(p->config_storage); } buffer_free(p->tmp_buf); array_free(p->encodings); free(p); return HANDLER_GO_ON; } SETDEFAULTS_FUNC(mod_deflate_setdefaults) { plugin_data *p = p_d; size_t i = 0; config_values_t cv[] = { { "deflate.mimetypes", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, { "deflate.allowed-encodings", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, { "deflate.max-compress-size", NULL, T_CONFIG_INT, T_CONFIG_SCOPE_CONNECTION }, { "deflate.min-compress-size", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, { "deflate.compression-level", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, { "deflate.output-buffer-size", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, { "deflate.work-block-size", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, { "deflate.max-loadavg", NULL, T_CONFIG_STRING,T_CONFIG_SCOPE_CONNECTION }, { NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET } }; p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *)); for (i = 0; i < srv->config_context->used; i++) { plugin_config *s; s = calloc(1, sizeof(plugin_config)); s->mimetypes = array_init(); s->allowed_encodings = 0; s->max_compress_size = 128*1024; /*(128 MB measured as num KB)*/ s->min_compress_size = 256; s->output_buffer_size = 0; s->work_block_size = 2048; s->sync_flush = 0; s->compression_level = -1; s->max_loadavg = 0.0; array_reset_data_strings(p->encodings); /* temp array for allowed encodings list */ cv[0].destination = s->mimetypes; cv[1].destination = p->encodings; cv[2].destination = &(s->max_compress_size); cv[3].destination = &(s->min_compress_size); cv[4].destination = &(s->compression_level); cv[5].destination = &(s->output_buffer_size); cv[6].destination = &(s->work_block_size); cv[7].destination = p->tmp_buf; buffer_clear(p->tmp_buf); p->config_storage[i] = s; if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) { return HANDLER_ERROR; } if ((s->compression_level < 1 || s->compression_level > 9) && s->compression_level != -1) { log_error_write(srv, __FILE__, __LINE__, "sd", "compression-level must be between 1 and 9:", s->compression_level); return HANDLER_ERROR; } if (!buffer_string_is_empty(p->tmp_buf)) { s->max_loadavg = strtod(p->tmp_buf->ptr, NULL); } if (!array_is_vlist(s->mimetypes)) { log_error_write(srv, __FILE__, __LINE__, "s", "unexpected value for deflate.mimetypes; expected list of \"mimetype\""); return HANDLER_ERROR; } if (!array_is_vlist(p->encodings)) { log_error_write(srv, __FILE__, __LINE__, "s", "unexpected value for deflate.allowed-encodings; expected list of \"encoding\""); return HANDLER_ERROR; } if (p->encodings->used) { size_t j = 0; for (j = 0; j < p->encodings->used; j++) { #if defined(USE_ZLIB) || defined(USE_BZ2LIB) data_string *ds = (data_string *)p->encodings->data[j]; #endif #ifdef USE_ZLIB if (NULL != strstr(ds->value->ptr, "gzip")) s->allowed_encodings |= HTTP_ACCEPT_ENCODING_GZIP | HTTP_ACCEPT_ENCODING_X_GZIP; if (NULL != strstr(ds->value->ptr, "x-gzip")) s->allowed_encodings |= HTTP_ACCEPT_ENCODING_X_GZIP; if (NULL != strstr(ds->value->ptr, "deflate")) s->allowed_encodings |= HTTP_ACCEPT_ENCODING_DEFLATE; /* if (NULL != strstr(ds->value->ptr, "compress")) s->allowed_encodings |= HTTP_ACCEPT_ENCODING_COMPRESS; */ #endif #ifdef USE_BZ2LIB if (NULL != strstr(ds->value->ptr, "bzip2")) s->allowed_encodings |= HTTP_ACCEPT_ENCODING_BZIP2 | HTTP_ACCEPT_ENCODING_X_BZIP2; if (NULL != strstr(ds->value->ptr, "x-bzip2")) s->allowed_encodings |= HTTP_ACCEPT_ENCODING_X_BZIP2; #endif } } else { /* default encodings */ #ifdef USE_ZLIB s->allowed_encodings |= HTTP_ACCEPT_ENCODING_GZIP | HTTP_ACCEPT_ENCODING_X_GZIP | HTTP_ACCEPT_ENCODING_DEFLATE; #endif #ifdef USE_BZ2LIB s->allowed_encodings |= HTTP_ACCEPT_ENCODING_BZIP2 | HTTP_ACCEPT_ENCODING_X_BZIP2; #endif } /* 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 (size_t m = 0; m < s->mimetypes->used; ++m) { buffer *mimetype = ((data_string *)s->mimetypes->data[m])->value; size_t len = buffer_string_length(mimetype); if (len > 2 && mimetype->ptr[len-1] == '*') { buffer_string_set_length(mimetype, len-1); } } } return HANDLER_GO_ON; } #if defined(USE_ZLIB) || defined(USE_BZ2LIB) static int stream_http_chunk_append_mem(server *srv, connection *con, handler_ctx *hctx, size_t len) { /* future: might also write stream to hctx temporary file in compressed file cache */ return http_chunk_append_mem(srv, con, 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(server *srv, connection *con, handler_ctx *hctx, unsigned char *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(srv, con, 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(server *srv, connection *con, handler_ctx *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(srv, con, 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(server *srv, 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_write(srv, __FILE__, __LINE__, "sdss", "deflateEnd error ret=", rc, ", msg=", z->msg); } else { log_error_write(srv, __FILE__, __LINE__, "sd", "deflateEnd error ret=", 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(server *srv, connection *con, handler_ctx *hctx, unsigned char *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(srv, con, 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(server *srv, connection *con, handler_ctx *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(srv, con, 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(server *srv, 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_write(srv, __FILE__, __LINE__, "sd", "BZ2_bzCompressEnd error ret=", 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(server *srv, connection *con, handler_ctx *hctx, unsigned char *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(srv, con, hctx, start, st_size); #endif #ifdef USE_BZ2LIB case HTTP_ACCEPT_ENCODING_BZIP2: return stream_bzip2_compress(srv, con, hctx, start, st_size); #endif default: UNUSED(srv); UNUSED(con); UNUSED(start); return -1; } } static int mod_deflate_stream_flush(server *srv, connection *con, handler_ctx *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(srv, con, hctx, end); #endif #ifdef USE_BZ2LIB case HTTP_ACCEPT_ENCODING_BZIP2: return stream_bzip2_flush(srv, con, hctx, end); #endif default: UNUSED(srv); UNUSED(con); UNUSED(end); return -1; } } static void mod_deflate_note_ratio(server *srv, connection *con, handler_ctx *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; li_itostrn(ratio, sizeof(ratio), hctx->bytes_out * 100 / hctx->bytes_in); http_header_env_set(con, CONST_STR_LEN("ratio"), ratio, strlen(ratio)); UNUSED(srv); } static int mod_deflate_stream_end(server *srv, handler_ctx *hctx) { switch(hctx->compression_type) { #ifdef USE_ZLIB case HTTP_ACCEPT_ENCODING_GZIP: case HTTP_ACCEPT_ENCODING_DEFLATE: return stream_deflate_end(srv, hctx); #endif #ifdef USE_BZ2LIB case HTTP_ACCEPT_ENCODING_BZIP2: return stream_bzip2_end(srv, hctx); #endif default: UNUSED(srv); return -1; } } static void deflate_compress_cleanup(server *srv, connection *con, handler_ctx *hctx) { const plugin_data *p = hctx->plugin_data; con->plugin_ctx[p->id] = NULL; if (0 != mod_deflate_stream_end(srv, hctx)) { log_error_write(srv, __FILE__, __LINE__, "s", "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_write(srv, __FILE__, __LINE__, "sbsdsd", "uri ", con->uri.path_raw, " in=", hctx->bytes_in, " smaller than out=", hctx->bytes_out); } #endif handler_ctx_free(hctx); } static int mod_deflate_file_chunk(server *srv, connection *con, handler_ctx *hctx, chunk *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, O_RDONLY, 0))) { log_error_write(srv, __FILE__, __LINE__, "sbs", "open failed for:", c->mem, strerror(errno)); 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 alot large files and 32bit * machine the virtual address area will be unrun 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_error_write(srv, __FILE__, __LINE__, "ssbd", "mmap failed:", strerror(errno), c->mem, 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_error_write(srv, __FILE__, __LINE__, "ssbd", "madvise failed:", strerror(errno), c->mem, 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_write(srv, __FILE__, __LINE__, "soooo", "toSend is negative:", toSend, c->file.mmap.length, abs_offset, 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_error_write(srv, __FILE__, __LINE__, "sbss", "reading", c->mem, "failed:", strerror(errno)); 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_write(srv, __FILE__, __LINE__, "sbd", "SIGBUS in mmap:", c->mem, c->file.fd); return -1; } } #endif if (mod_deflate_compress(srv, con, hctx, (unsigned char *)start + (abs_offset - c->file.mmap.offset), toSend) < 0) { log_error_write(srv, __FILE__, __LINE__, "s", "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(server *srv, connection *con, handler_ctx *hctx) { off_t len, max; int close_stream; /* move all chunk from write_queue into our in_queue, then adjust * counters since con->write_queue is reused for compressed output */ len = chunkqueue_length(con->write_queue); chunkqueue_remove_finished_chunks(con->write_queue); chunkqueue_append_chunkqueue(hctx->in_queue, con->write_queue); con->write_queue->bytes_in -= len; con->write_queue->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(srv, con, hctx, (unsigned char *)c->mem->ptr+c->offset, len) < 0) { log_error_write(srv, __FILE__, __LINE__, "s", "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(srv, con, hctx, c, len)) < 0) { log_error_write(srv, __FILE__, __LINE__, "s", "compress file chunk failed."); return HANDLER_ERROR; } break; default: log_error_write(srv, __FILE__, __LINE__, "ds", c, "type not known"); 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 = (con->file_finished && chunkqueue_is_empty(hctx->in_queue)); if (mod_deflate_stream_flush(srv, con, hctx, close_stream) < 0) { log_error_write(srv, __FILE__, __LINE__, "s", "flush error"); return HANDLER_ERROR; } return close_stream ? HANDLER_FINISHED : HANDLER_GO_ON; } #define PATCH(x) \ p->conf.x = s->x; static int mod_deflate_patch_connection(server *srv, connection *con, plugin_data *p) { size_t i, j; plugin_config *s = p->config_storage[0]; PATCH(mimetypes); PATCH(allowed_encodings); PATCH(max_compress_size); PATCH(min_compress_size); PATCH(compression_level); PATCH(output_buffer_size); PATCH(work_block_size); PATCH(max_loadavg); /* skip the first, the global context */ for (i = 1; i < srv->config_context->used; i++) { data_config *dc = (data_config *)srv->config_context->data[i]; s = p->config_storage[i]; /* condition didn't match */ if (!config_check_cond(srv, con, dc)) continue; /* merge config */ for (j = 0; j < dc->value->used; j++) { data_unset *du = dc->value->data[j]; if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.mimetypes"))) { PATCH(mimetypes); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.allowed-encodings"))) { PATCH(allowed_encodings); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.max-compress-size"))) { PATCH(max_compress_size); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.min-compress-size"))) { PATCH(min_compress_size); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.compression-level"))) { PATCH(compression_level); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.output-buffer-size"))) { PATCH(output_buffer_size); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.work-block-size"))) { PATCH(work_block_size); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("deflate.max-loadavg"))) { PATCH(max_loadavg); } } } return 0; } #undef PATCH 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); #endif #ifdef USE_ZLIB if (NULL != strstr(value, "gzip")) accept_encoding |= HTTP_ACCEPT_ENCODING_GZIP; else if (NULL != strstr(value, "x-gzip")) accept_encoding |= HTTP_ACCEPT_ENCODING_X_GZIP; if (NULL != strstr(value, "deflate")) accept_encoding |= HTTP_ACCEPT_ENCODING_DEFLATE; #endif /* if (NULL != strstr(value, "compress")) accept_encoding |= HTTP_ACCEPT_ENCODING_COMPRESS; */ #ifdef USE_BZ2LIB if (p->conf.allowed_encodings & (HTTP_ACCEPT_ENCODING_BZIP2 | HTTP_ACCEPT_ENCODING_X_BZIP2)) { if (NULL != strstr(value, "bzip2")) accept_encoding |= HTTP_ACCEPT_ENCODING_BZIP2; else if (NULL != strstr(value, "x-bzip2")) accept_encoding |= HTTP_ACCEPT_ENCODING_X_BZIP2; } #endif /* if (NULL != strstr(value, "identity")) accept_encoding |= HTTP_ACCEPT_ENCODING_IDENTITY; */ /* 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 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 { return 0; } } CONNECTION_FUNC(mod_deflate_handle_response_start) { plugin_data *p = p_d; 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 (!con->file_finished) return HANDLER_GO_ON; if (con->request.http_method == HTTP_METHOD_HEAD) return HANDLER_GO_ON; if (con->response.htags & HTTP_HEADER_TRANSFER_ENCODING) return HANDLER_GO_ON; /* disable compression for some http status types. */ switch(con->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_connection(srv, con, p); /* check if deflate configured for any mimetypes */ if (!p->conf.mimetypes->used) return HANDLER_GO_ON; /* check if size of response is below min-compress-size or exceeds max*/ /* (con->file_finished checked at top of routine) */ len = chunkqueue_length(con->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. */ vb = http_header_response_get(con, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding")); if (NULL != vb) return HANDLER_GO_ON; /* Check Accept-Encoding for supported encoding. */ vb = http_header_request_get(con, HTTP_HEADER_ACCEPT_ENCODING, CONST_STR_LEN("Accept-Encoding")); if (NULL == vb) return HANDLER_GO_ON; /* find matching encodings */ compression_type = mod_deflate_choose_encoding(vb->ptr, p, &label); if (!compression_type) return HANDLER_GO_ON; /* Check mimetype in response header "Content-Type" */ if (NULL != (vb = http_header_response_get(con, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type")))) { if (NULL == array_match_value_prefix(p->conf.mimetypes, vb)) 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(con, 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(con, 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(con, HTTP_HEADER_ETAG, CONST_STR_LEN("ETag")); if (NULL != vb && (con->request.htags & HTTP_HEADER_IF_NONE_MATCH)) { buffer *if_none_match = http_header_response_get(con, HTTP_HEADER_IF_NONE_MATCH, CONST_STR_LEN("If-None-Match")); etaglen = buffer_string_length(vb); if (etaglen && con->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 == con->request.http_method || HTTP_METHOD_HEAD == con->request.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(con->physical.etag, vb);*//*(keep in sync?)*/ con->http_status = 304; } else { con->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 con->mode = DIRECT */ /* clear content length even if 304 since compressed length unknown */ http_response_body_clear(con, 0); con->file_finished = 1; con->mode = DIRECT; return HANDLER_GO_ON; } } if (0.0 < p->conf.max_loadavg && p->conf.max_loadavg < srv->srvconf.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(con->physical.etag, vb);*//*(keep in sync?)*/ } /* set Content-Encoding to show selected compression type */ http_header_response_set(con, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding"), label, strlen(label)); /* clear Content-Length and con->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 == con->request.http_method) { /* ensure that uncompressed Content-Length is not sent in HEAD response */ http_response_body_clear(con, 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 con->write_queue */ /* enable compression */ p->conf.sync_flush = (con->conf.stream_response_body && 0 == p->conf.output_buffer_size); hctx = handler_ctx_init(); hctx->plugin_data = p; hctx->compression_type = compression_type; /* 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_write(srv, __FILE__, __LINE__, "ss", "Failed to initialize compression", 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(con, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding")); return HANDLER_GO_ON; } if (con->response.htags & HTTP_HEADER_CONTENT_LENGTH) { http_header_response_unset(con, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); } con->plugin_ctx[p->id] = hctx; rc = deflate_compress_response(srv, con, hctx); if (HANDLER_GO_ON != rc) { if (HANDLER_FINISHED == rc) { mod_deflate_note_ratio(srv, con, hctx); } deflate_compress_cleanup(srv, con, hctx); if (HANDLER_ERROR == rc) return HANDLER_ERROR; } return HANDLER_GO_ON; } static handler_t mod_deflate_cleanup(server *srv, connection *con, void *p_d) { plugin_data *p = p_d; handler_ctx *hctx = con->plugin_ctx[p->id]; if (NULL != hctx) deflate_compress_cleanup(srv, con, 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 = buffer_init_string("deflate"); p->init = mod_deflate_init; p->cleanup = mod_deflate_free; p->set_defaults = mod_deflate_setdefaults; p->connection_reset = mod_deflate_cleanup; p->handle_response_start = mod_deflate_handle_response_start; p->data = NULL; return 0; }