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#include "first.h"
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "response.h"
#include "stat_cache.h"
#include "plugin.h"
#include "crc32.h"
#include "etag.h"
#include <sys/types.h>
#include <sys/stat.h>
#include "sys-strings.h"
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
#if defined HAVE_ZLIB_H && defined HAVE_LIBZ
# define USE_ZLIB
# include <zlib.h>
#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)
#ifdef __WIN32
# define mkdir(x,y) mkdir(x)
#endif
typedef struct {
buffer *compress_cache_dir;
array *compress;
off_t compress_max_filesize; /** max filesize in kb */
int allowed_encodings;
double max_loadavg;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *ofn;
buffer *b;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
INIT_FUNC(mod_compress_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->ofn = buffer_init();
p->b = buffer_init();
return p;
}
FREE_FUNC(mod_compress_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
buffer_free(p->ofn);
buffer_free(p->b);
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (NULL == s) continue;
array_free(s->compress);
buffer_free(s->compress_cache_dir);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
/* 0 on success, -1 for error */
static int mkdir_recursive(char *dir) {
char *p = dir;
if (!dir || !dir[0])
return 0;
while ((p = strchr(p + 1, '/')) != NULL) {
*p = '\0';
if ((mkdir(dir, 0700) != 0) && (errno != EEXIST)) {
*p = '/';
return -1;
}
*p++ = '/';
if (!*p) return 0; /* Ignore trailing slash */
}
return (mkdir(dir, 0700) != 0) && (errno != EEXIST) ? -1 : 0;
}
/* 0 on success, -1 for error */
static int mkdir_for_file(char *filename) {
char *p = filename;
if (!filename || !filename[0])
return -1;
while ((p = strchr(p + 1, '/')) != NULL) {
*p = '\0';
if ((mkdir(filename, 0700) != 0) && (errno != EEXIST)) {
*p = '/';
return -1;
}
*p++ = '/';
if (!*p) return -1; /* Unexpected trailing slash in filename */
}
return 0;
}
SETDEFAULTS_FUNC(mod_compress_setdefaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "compress.cache-dir", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "compress.filetype", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },
{ "compress.max-filesize", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },
{ "compress.allowed-encodings", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },
{ "compress.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++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
plugin_config *s;
array *encodings_arr = array_init();
s = calloc(1, sizeof(plugin_config));
s->compress_cache_dir = buffer_init();
s->compress = array_init();
s->compress_max_filesize = 0;
s->allowed_encodings = 0;
s->max_loadavg = 0.0;
cv[0].destination = s->compress_cache_dir;
cv[1].destination = s->compress;
cv[2].destination = &(s->compress_max_filesize);
cv[3].destination = encodings_arr; /* temp array for allowed encodings list */
cv[4].destination = srv->tmp_buf;
buffer_string_set_length(srv->tmp_buf, 0);
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
if (!buffer_string_is_empty(srv->tmp_buf)) {
s->max_loadavg = strtod(srv->tmp_buf->ptr, NULL);
}
if (!array_is_vlist(s->compress)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"unexpected value for compress.filetype; expected list of \"mimetype\"");
return HANDLER_ERROR;
}
if (!array_is_vlist(encodings_arr)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"unexpected value for compress.allowed-encodings; expected list of \"encoding\"");
return HANDLER_ERROR;
}
if (encodings_arr->used) {
size_t j = 0;
for (j = 0; j < encodings_arr->used; j++) {
#if defined(USE_ZLIB) || defined(USE_BZ2LIB)
data_string *ds = (data_string *)encodings_arr->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 */
s->allowed_encodings = 0
#ifdef USE_ZLIB
| HTTP_ACCEPT_ENCODING_GZIP | HTTP_ACCEPT_ENCODING_X_GZIP | HTTP_ACCEPT_ENCODING_DEFLATE
#endif
#ifdef USE_BZ2LIB
| HTTP_ACCEPT_ENCODING_BZIP2 | HTTP_ACCEPT_ENCODING_X_BZIP2
#endif
;
}
array_free(encodings_arr);
if (!buffer_string_is_empty(s->compress_cache_dir)) {
struct stat st;
mkdir_recursive(s->compress_cache_dir->ptr);
if (0 != stat(s->compress_cache_dir->ptr, &st)) {
log_error_write(srv, __FILE__, __LINE__, "sbs", "can't stat compress.cache-dir",
s->compress_cache_dir, strerror(errno));
return HANDLER_ERROR;
}
}
}
return HANDLER_GO_ON;
}
#ifdef USE_ZLIB
static int deflate_file_to_buffer_gzip(server *srv, connection *con, plugin_data *p, char *start, off_t st_size, time_t mtime) {
unsigned char *c;
unsigned long crc;
z_stream z;
size_t outlen;
UNUSED(srv);
UNUSED(con);
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
if (Z_OK != deflateInit2(&z,
Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
-MAX_WBITS, /* supress zlib-header */
8,
Z_DEFAULT_STRATEGY)) {
return -1;
}
z.next_in = (unsigned char *)start;
z.avail_in = st_size;
z.total_in = 0;
buffer_string_prepare_copy(p->b, (z.avail_in * 1.1) + 12 + 18);
/* write gzip header */
c = (unsigned char *)p->b->ptr;
c[0] = 0x1f;
c[1] = 0x8b;
c[2] = Z_DEFLATED;
c[3] = 0; /* options */
c[4] = (mtime >> 0) & 0xff;
c[5] = (mtime >> 8) & 0xff;
c[6] = (mtime >> 16) & 0xff;
c[7] = (mtime >> 24) & 0xff;
c[8] = 0x00; /* extra flags */
c[9] = 0x03; /* UNIX */
outlen = 10;
z.next_out = (unsigned char *)p->b->ptr + outlen;
z.avail_out = p->b->size - outlen - 9;
z.total_out = 0;
if (Z_STREAM_END != deflate(&z, Z_FINISH)) {
deflateEnd(&z);
return -1;
}
/* trailer */
outlen += z.total_out;
crc = generate_crc32c(start, st_size);
c = (unsigned char *)p->b->ptr + outlen;
c[0] = (crc >> 0) & 0xff;
c[1] = (crc >> 8) & 0xff;
c[2] = (crc >> 16) & 0xff;
c[3] = (crc >> 24) & 0xff;
c[4] = (z.total_in >> 0) & 0xff;
c[5] = (z.total_in >> 8) & 0xff;
c[6] = (z.total_in >> 16) & 0xff;
c[7] = (z.total_in >> 24) & 0xff;
outlen += 8;
buffer_commit(p->b, outlen);
if (Z_OK != deflateEnd(&z)) {
return -1;
}
return 0;
}
static int deflate_file_to_buffer_deflate(server *srv, connection *con, plugin_data *p, unsigned char *start, off_t st_size) {
z_stream z;
UNUSED(srv);
UNUSED(con);
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
if (Z_OK != deflateInit2(&z,
Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
-MAX_WBITS, /* supress zlib-header */
8,
Z_DEFAULT_STRATEGY)) {
return -1;
}
z.next_in = start;
z.avail_in = st_size;
z.total_in = 0;
buffer_string_prepare_copy(p->b, (z.avail_in * 1.1) + 12);
z.next_out = (unsigned char *)p->b->ptr;
z.avail_out = p->b->size - 1;
z.total_out = 0;
if (Z_STREAM_END != deflate(&z, Z_FINISH)) {
deflateEnd(&z);
return -1;
}
if (Z_OK != deflateEnd(&z)) {
return -1;
}
/* trailer */
buffer_commit(p->b, z.total_out);
return 0;
}
#endif
#ifdef USE_BZ2LIB
static int deflate_file_to_buffer_bzip2(server *srv, connection *con, plugin_data *p, unsigned char *start, off_t st_size) {
bz_stream bz;
UNUSED(srv);
UNUSED(con);
bz.bzalloc = NULL;
bz.bzfree = NULL;
bz.opaque = NULL;
if (BZ_OK != BZ2_bzCompressInit(&bz,
9, /* blocksize = 900k */
0, /* no output */
0)) { /* workFactor: default */
return -1;
}
bz.next_in = (char *)start;
bz.avail_in = st_size;
bz.total_in_lo32 = 0;
bz.total_in_hi32 = 0;
buffer_string_prepare_copy(p->b, (bz.avail_in * 1.1) + 12);
bz.next_out = p->b->ptr;
bz.avail_out = p->b->size - 1;
bz.total_out_lo32 = 0;
bz.total_out_hi32 = 0;
if (BZ_STREAM_END != BZ2_bzCompress(&bz, BZ_FINISH)) {
BZ2_bzCompressEnd(&bz);
return -1;
}
if (BZ_OK != BZ2_bzCompressEnd(&bz)) {
return -1;
}
/* file is too large for now */
if (bz.total_out_hi32) return -1;
/* trailer */
buffer_commit(p->b, bz.total_out_lo32);
return 0;
}
#endif
static void mod_compress_note_ratio(server *srv, connection *con, off_t in, off_t out) {
/* store compression ratio in con->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 == in) return;
li_itostrn(ratio, sizeof(ratio), out * 100 / in);
array_set_key_value(con->environment,
CONST_STR_LEN("ratio"),
ratio, strlen(ratio));
UNUSED(srv);
}
static int deflate_file_to_file(server *srv, connection *con, plugin_data *p, buffer *fn, stat_cache_entry *sce, int type) {
int ifd, ofd;
int ret;
#ifdef USE_MMAP
volatile int mapped = 0;/* quiet warning: might be clobbered by 'longjmp' */
#endif
void *start;
const char *filename = fn->ptr;
stat_cache_entry *sce_ofn;
ssize_t r;
/* overflow */
if ((off_t)(sce->st.st_size * 1.1) < sce->st.st_size) return -1;
/* don't mmap files > 128Mb
*
* we could use a sliding window, but currently there is no need for it
*/
if (sce->st.st_size > 128 * 1024 * 1024) return -1;
buffer_reset(p->ofn);
buffer_copy_buffer(p->ofn, p->conf.compress_cache_dir);
buffer_append_slash(p->ofn);
if (0 == strncmp(con->physical.path->ptr, con->physical.doc_root->ptr, buffer_string_length(con->physical.doc_root))) {
buffer_append_string(p->ofn, con->physical.path->ptr + buffer_string_length(con->physical.doc_root));
} else {
buffer_append_string_buffer(p->ofn, con->uri.path);
}
switch(type) {
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_X_GZIP:
buffer_append_string_len(p->ofn, CONST_STR_LEN("-gzip-"));
break;
case HTTP_ACCEPT_ENCODING_DEFLATE:
buffer_append_string_len(p->ofn, CONST_STR_LEN("-deflate-"));
break;
case HTTP_ACCEPT_ENCODING_BZIP2:
case HTTP_ACCEPT_ENCODING_X_BZIP2:
buffer_append_string_len(p->ofn, CONST_STR_LEN("-bzip2-"));
break;
default:
log_error_write(srv, __FILE__, __LINE__, "sd", "unknown compression type", type);
return -1;
}
buffer_append_string_buffer(p->ofn, sce->etag);
if (HANDLER_ERROR != stat_cache_get_entry(srv, con, p->ofn, &sce_ofn)) {
if (0 == sce->st.st_size) return -1; /* cache file being created */
/* cache-entry exists */
#if 0
log_error_write(srv, __FILE__, __LINE__, "bs", p->ofn, "compress-cache hit");
#endif
mod_compress_note_ratio(srv, con, sce->st.st_size, sce_ofn->st.st_size);
buffer_copy_buffer(con->physical.path, p->ofn);
return 0;
}
if (0.0 < p->conf.max_loadavg && p->conf.max_loadavg < srv->srvconf.loadavg[0]) {
return -1;
}
if (-1 == mkdir_for_file(p->ofn->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "sb", "couldn't create directory for file", p->ofn);
return -1;
}
if (-1 == (ofd = open(p->ofn->ptr, O_WRONLY | O_CREAT | O_EXCL | O_BINARY, 0600))) {
if (errno == EEXIST) {
return -1; /* cache file being created */
}
log_error_write(srv, __FILE__, __LINE__, "sbss", "creating cachefile", p->ofn, "failed", strerror(errno));
return -1;
}
#if 0
log_error_write(srv, __FILE__, __LINE__, "bs", p->ofn, "compress-cache miss");
#endif
if (-1 == (ifd = open(filename, O_RDONLY | O_BINARY))) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "opening plain-file", fn, "failed", strerror(errno));
close(ofd);
/* Remove the incomplete cache file, so that later hits aren't served from it */
if (-1 == unlink(p->ofn->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "unlinking incomplete cachefile", p->ofn, "failed:", strerror(errno));
}
return -1;
}
#ifdef USE_MMAP
if (MAP_FAILED != (start = mmap(NULL, sce->st.st_size, PROT_READ, MAP_SHARED, ifd, 0))
|| (errno == EINVAL && MAP_FAILED != (start = mmap(NULL, sce->st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0)))) {
mapped = 1;
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:",
fn, ifd);
munmap(start, sce->st.st_size);
close(ofd);
close(ifd);
/* Remove the incomplete cache file, so that later hits aren't served from it */
if (-1 == unlink(p->ofn->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "unlinking incomplete cachefile", p->ofn, "failed:", strerror(errno));
}
return -1;
}
} else
#endif /* FIXME: might attempt to read very large file completely into memory; see compress.max-filesize config option */
if (NULL == (start = malloc(sce->st.st_size)) || sce->st.st_size != read(ifd, start, sce->st.st_size)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "reading", fn, "failed", strerror(errno));
close(ofd);
close(ifd);
free(start);
/* Remove the incomplete cache file, so that later hits aren't served from it */
if (-1 == unlink(p->ofn->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "unlinking incomplete cachefile", p->ofn, "failed:", strerror(errno));
}
return -1;
}
ret = -1;
switch(type) {
#ifdef USE_ZLIB
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_X_GZIP:
ret = deflate_file_to_buffer_gzip(srv, con, p, start, sce->st.st_size, sce->st.st_mtime);
break;
case HTTP_ACCEPT_ENCODING_DEFLATE:
ret = deflate_file_to_buffer_deflate(srv, con, p, start, sce->st.st_size);
break;
#endif
#ifdef USE_BZ2LIB
case HTTP_ACCEPT_ENCODING_BZIP2:
case HTTP_ACCEPT_ENCODING_X_BZIP2:
ret = deflate_file_to_buffer_bzip2(srv, con, p, start, sce->st.st_size);
break;
#endif
}
if (ret == 0) {
r = write(ofd, CONST_BUF_LEN(p->b));
if (-1 == r) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "writing cachefile", p->ofn, "failed:", strerror(errno));
ret = -1;
} else if ((size_t)r != buffer_string_length(p->b)) {
log_error_write(srv, __FILE__, __LINE__, "sbs", "writing cachefile", p->ofn, "failed: not enough bytes written");
ret = -1;
}
}
#ifdef USE_MMAP
if (mapped) {
sigbus_jmp_valid = 0;
munmap(start, sce->st.st_size);
} else
#endif
free(start);
close(ifd);
if (0 != close(ofd) || ret != 0) {
if (0 == ret) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "writing cachefile", p->ofn, "failed:", strerror(errno));
}
/* Remove the incomplete cache file, so that later hits aren't served from it */
if (-1 == unlink(p->ofn->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "unlinking incomplete cachefile", p->ofn, "failed:", strerror(errno));
}
return -1;
}
buffer_copy_buffer(con->physical.path, p->ofn);
mod_compress_note_ratio(srv, con, sce->st.st_size,
(off_t)buffer_string_length(p->b));
return 0;
}
static int deflate_file_to_buffer(server *srv, connection *con, plugin_data *p, buffer *fn, stat_cache_entry *sce, int type) {
int ifd;
int ret = -1;
#ifdef USE_MMAP
volatile int mapped = 0;/* quiet warning: might be clobbered by 'longjmp' */
#endif
void *start;
/* overflow */
if ((off_t)(sce->st.st_size * 1.1) < sce->st.st_size) return -1;
/* don't mmap files > 128M
*
* we could use a sliding window, but currently there is no need for it
*/
if (sce->st.st_size > 128 * 1024 * 1024) return -1;
if (0.0 < p->conf.max_loadavg && p->conf.max_loadavg < srv->srvconf.loadavg[0]) {
return -1;
}
if (-1 == (ifd = open(fn->ptr, O_RDONLY | O_BINARY))) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "opening plain-file", fn, "failed", strerror(errno));
return -1;
}
#ifdef USE_MMAP
if (MAP_FAILED != (start = mmap(NULL, sce->st.st_size, PROT_READ, MAP_SHARED, ifd, 0))
|| (errno == EINVAL && MAP_FAILED != (start = mmap(NULL, sce->st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0)))) {
mapped = 1;
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:",
fn, ifd);
munmap(start, sce->st.st_size);
close(ifd);
return -1;
}
} else
#endif /* FIXME: might attempt to read very large file completely into memory; see compress.max-filesize config option */
if (NULL == (start = malloc(sce->st.st_size)) || sce->st.st_size != read(ifd, start, sce->st.st_size)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "reading", fn, "failed", strerror(errno));
close(ifd);
free(start);
return -1;
}
switch(type) {
#ifdef USE_ZLIB
case HTTP_ACCEPT_ENCODING_GZIP:
case HTTP_ACCEPT_ENCODING_X_GZIP:
ret = deflate_file_to_buffer_gzip(srv, con, p, start, sce->st.st_size, sce->st.st_mtime);
break;
case HTTP_ACCEPT_ENCODING_DEFLATE:
ret = deflate_file_to_buffer_deflate(srv, con, p, start, sce->st.st_size);
break;
#endif
#ifdef USE_BZ2LIB
case HTTP_ACCEPT_ENCODING_BZIP2:
case HTTP_ACCEPT_ENCODING_X_BZIP2:
ret = deflate_file_to_buffer_bzip2(srv, con, p, start, sce->st.st_size);
break;
#endif
default:
ret = -1;
break;
}
#ifdef USE_MMAP
if (mapped) {
sigbus_jmp_valid = 0;
munmap(start, sce->st.st_size);
} else
#endif
free(start);
close(ifd);
if (ret != 0) return -1;
mod_compress_note_ratio(srv, con, sce->st.st_size,
(off_t)buffer_string_length(p->b));
chunkqueue_reset(con->write_queue);
chunkqueue_append_buffer(con->write_queue, p->b);
buffer_reset(con->physical.path);
con->file_finished = 1;
con->file_started = 1;
return 0;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_compress_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(compress_cache_dir);
PATCH(compress);
PATCH(compress_max_filesize);
PATCH(allowed_encodings);
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("compress.cache-dir"))) {
PATCH(compress_cache_dir);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("compress.filetype"))) {
PATCH(compress);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("compress.max-filesize"))) {
PATCH(compress_max_filesize);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("compress.allowed-encodings"))) {
PATCH(allowed_encodings);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("compress.max-loadavg"))) {
PATCH(max_loadavg);
}
}
}
return 0;
}
#undef PATCH
static int mod_compress_contains_encoding(const char *headervalue, const char *encoding, size_t len) {
const char *m = headervalue;
do {
while (*m == ',' || *m == ' ' || *m == '\t') {
++m;
}
if (0 == strncasecmp(m, encoding, len)) {
/*(not a full HTTP field parse: not parsing for q-values and not handling q=0)*/
m += len;
if (*m == '\0' || *m == ',' || *m == ';' || *m == ' ' || *m == '\t')
return 1;
} else if (*m != '\0') {
++m;
}
} while ((m = strchr(m, ',')));
return 0;
}
PHYSICALPATH_FUNC(mod_compress_physical) {
plugin_data *p = p_d;
size_t m;
off_t max_fsize;
stat_cache_entry *sce = NULL;
buffer *mtime = NULL;
buffer *content_type;
if (con->mode != DIRECT || con->http_status) return HANDLER_GO_ON;
/* only GET and POST can get compressed */
if (con->request.http_method != HTTP_METHOD_GET &&
con->request.http_method != HTTP_METHOD_POST) {
return HANDLER_GO_ON;
}
if (buffer_string_is_empty(con->physical.path)) {
return HANDLER_GO_ON;
}
mod_compress_patch_connection(srv, con, p);
max_fsize = p->conf.compress_max_filesize;
if (con->conf.log_request_handling) {
log_error_write(srv, __FILE__, __LINE__, "s", "-- handling file as static file");
}
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
con->http_status = 403;
log_error_write(srv, __FILE__, __LINE__, "sbsb",
"not a regular file:", con->uri.path,
"->", con->physical.path);
return HANDLER_FINISHED;
}
/* we only handle regular files */
#ifdef HAVE_LSTAT
if ((sce->is_symlink == 1) && !con->conf.follow_symlink) {
return HANDLER_GO_ON;
}
#endif
if (!S_ISREG(sce->st.st_mode)) {
return HANDLER_GO_ON;
}
/* don't compress files that are too large as we need to much time to handle them */
if (max_fsize && (sce->st.st_size >> 10) > max_fsize) return HANDLER_GO_ON;
/* don't try to compress files less than 128 bytes
*
* - extra overhead for compression
* - mmap() fails for st_size = 0 :)
*/
if (sce->st.st_size < 128) return HANDLER_GO_ON;
stat_cache_etag_get(sce, con->etag_flags);
/* check if mimetype is in compress-config */
content_type = NULL;
stat_cache_content_type_get(srv, con, con->physical.path, sce);
if (sce->content_type->ptr) {
char *c;
if ( (c = strchr(sce->content_type->ptr, ';')) != NULL) {
content_type = srv->tmp_buf;
buffer_copy_string_len(content_type, sce->content_type->ptr, c - sce->content_type->ptr);
}
}
for (m = 0; m < p->conf.compress->used; m++) {
data_string *compress_ds = (data_string *)p->conf.compress->data[m];
if (buffer_is_equal(compress_ds->value, sce->content_type)
|| (content_type && buffer_is_equal(compress_ds->value, content_type))) {
/* mimetype found */
data_string *ds;
/* the response might change according to Accept-Encoding */
response_header_insert(srv, con, CONST_STR_LEN("Vary"), CONST_STR_LEN("Accept-Encoding"));
if (NULL != (ds = (data_string *)array_get_element(con->request.headers, "Accept-Encoding"))) {
int accept_encoding = 0;
char *value = ds->value->ptr;
int matched_encodings = 0;
int use_etag = sce->etag != NULL && sce->etag->ptr != NULL;
/* get client side support encodings */
#ifdef USE_ZLIB
if (mod_compress_contains_encoding(value, CONST_STR_LEN("gzip"))) accept_encoding |= HTTP_ACCEPT_ENCODING_GZIP;
if (mod_compress_contains_encoding(value, CONST_STR_LEN("x-gzip"))) accept_encoding |= HTTP_ACCEPT_ENCODING_X_GZIP;
if (mod_compress_contains_encoding(value, CONST_STR_LEN("deflate"))) accept_encoding |= HTTP_ACCEPT_ENCODING_DEFLATE;
if (mod_compress_contains_encoding(value, CONST_STR_LEN("compress"))) accept_encoding |= HTTP_ACCEPT_ENCODING_COMPRESS;
#endif
#ifdef USE_BZ2LIB
if (mod_compress_contains_encoding(value, CONST_STR_LEN("bzip2"))) accept_encoding |= HTTP_ACCEPT_ENCODING_BZIP2;
if (mod_compress_contains_encoding(value, CONST_STR_LEN("x-bzip2"))) accept_encoding |= HTTP_ACCEPT_ENCODING_X_BZIP2;
#endif
if (mod_compress_contains_encoding(value, CONST_STR_LEN("identity"))) accept_encoding |= HTTP_ACCEPT_ENCODING_IDENTITY;
/* find matching entries */
matched_encodings = accept_encoding & p->conf.allowed_encodings;
if (matched_encodings) {
static const char dflt_gzip[] = "gzip";
static const char dflt_x_gzip[] = "x-gzip";
static const char dflt_deflate[] = "deflate";
static const char dflt_bzip2[] = "bzip2";
static const char dflt_x_bzip2[] = "x-bzip2";
const char *compression_name = NULL;
int compression_type = 0;
mtime = strftime_cache_get(srv, sce->st.st_mtime);
/* try matching original etag of uncompressed version */
if (use_etag) {
etag_mutate(con->physical.etag, sce->etag);
if (HANDLER_FINISHED == http_response_handle_cachable(srv, con, mtime)) {
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
response_header_overwrite(srv, con, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime));
response_header_overwrite(srv, con, CONST_STR_LEN("ETag"), CONST_BUF_LEN(con->physical.etag));
return HANDLER_FINISHED;
}
}
/* select best matching encoding */
if (matched_encodings & HTTP_ACCEPT_ENCODING_BZIP2) {
compression_type = HTTP_ACCEPT_ENCODING_BZIP2;
compression_name = dflt_bzip2;
} else if (matched_encodings & HTTP_ACCEPT_ENCODING_X_BZIP2) {
compression_type = HTTP_ACCEPT_ENCODING_X_BZIP2;
compression_name = dflt_x_bzip2;
} else if (matched_encodings & HTTP_ACCEPT_ENCODING_GZIP) {
compression_type = HTTP_ACCEPT_ENCODING_GZIP;
compression_name = dflt_gzip;
} else if (matched_encodings & HTTP_ACCEPT_ENCODING_X_GZIP) {
compression_type = HTTP_ACCEPT_ENCODING_X_GZIP;
compression_name = dflt_x_gzip;
} else {
force_assert(matched_encodings & HTTP_ACCEPT_ENCODING_DEFLATE);
compression_type = HTTP_ACCEPT_ENCODING_DEFLATE;
compression_name = dflt_deflate;
}
if (use_etag) {
/* try matching etag of compressed version */
buffer_copy_buffer(srv->tmp_buf, sce->etag);
buffer_append_string_len(srv->tmp_buf, CONST_STR_LEN("-"));
buffer_append_string(srv->tmp_buf, compression_name);
etag_mutate(con->physical.etag, srv->tmp_buf);
}
if (HANDLER_FINISHED == http_response_handle_cachable(srv, con, mtime)) {
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Encoding"), compression_name, strlen(compression_name));
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
response_header_overwrite(srv, con, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime));
if (use_etag) {
response_header_overwrite(srv, con, CONST_STR_LEN("ETag"), CONST_BUF_LEN(con->physical.etag));
}
return HANDLER_FINISHED;
}
/* deflate it */
if (use_etag && !buffer_string_is_empty(p->conf.compress_cache_dir)) {
if (0 != deflate_file_to_file(srv, con, p, con->physical.path, sce, compression_type))
return HANDLER_GO_ON;
} else {
if (0 != deflate_file_to_buffer(srv, con, p, con->physical.path, sce, compression_type))
return HANDLER_GO_ON;
}
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Encoding"), compression_name, strlen(compression_name));
response_header_overwrite(srv, con, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime));
if (use_etag) {
response_header_overwrite(srv, con, CONST_STR_LEN("ETag"), CONST_BUF_LEN(con->physical.etag));
}
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
/* let mod_staticfile handle the cached compressed files, physical path was modified */
return (use_etag && !buffer_string_is_empty(p->conf.compress_cache_dir)) ? HANDLER_GO_ON : HANDLER_FINISHED;
}
}
}
}
return HANDLER_GO_ON;
}
int mod_compress_plugin_init(plugin *p);
int mod_compress_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("compress");
p->init = mod_compress_init;
p->set_defaults = mod_compress_setdefaults;
p->handle_subrequest_start = mod_compress_physical;
p->cleanup = mod_compress_free;
p->data = NULL;
return 0;
}