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nginx / nginx / 2fd8b271c4ff1474ac52f06051829513169eae17 / . / src / http / modules / ngx_http_log_module.c
blob: aa6a3fceee95de123ebde336946c84c5380a9f5c [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#if (NGX_ZLIB)
#include <zlib.h>
#endif
typedef struct ngx_http_log_op_s ngx_http_log_op_t;
typedef u_char *(*ngx_http_log_op_run_pt) (ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
typedef size_t (*ngx_http_log_op_getlen_pt) (ngx_http_request_t *r,
uintptr_t data);
struct ngx_http_log_op_s {
size_t len;
ngx_http_log_op_getlen_pt getlen;
ngx_http_log_op_run_pt run;
uintptr_t data;
};
typedef struct {
ngx_str_t name;
ngx_array_t *flushes;
ngx_array_t *ops; /* array of ngx_http_log_op_t */
} ngx_http_log_fmt_t;
typedef struct {
ngx_array_t formats; /* array of ngx_http_log_fmt_t */
ngx_uint_t combined_used; /* unsigned combined_used:1 */
} ngx_http_log_main_conf_t;
typedef struct {
u_char *start;
u_char *pos;
u_char *last;
ngx_event_t *event;
ngx_msec_t flush;
ngx_int_t gzip;
} ngx_http_log_buf_t;
typedef struct {
ngx_array_t *lengths;
ngx_array_t *values;
} ngx_http_log_script_t;
typedef struct {
ngx_open_file_t *file;
ngx_http_log_script_t *script;
time_t disk_full_time;
time_t error_log_time;
ngx_http_log_fmt_t *format;
} ngx_http_log_t;
typedef struct {
ngx_array_t *logs; /* array of ngx_http_log_t */
ngx_open_file_cache_t *open_file_cache;
time_t open_file_cache_valid;
ngx_uint_t open_file_cache_min_uses;
ngx_uint_t off; /* unsigned off:1 */
} ngx_http_log_loc_conf_t;
typedef struct {
ngx_str_t name;
size_t len;
ngx_http_log_op_run_pt run;
} ngx_http_log_var_t;
static void ngx_http_log_write(ngx_http_request_t *r, ngx_http_log_t *log,
u_char *buf, size_t len);
static ssize_t ngx_http_log_script_write(ngx_http_request_t *r,
ngx_http_log_script_t *script, u_char **name, u_char *buf, size_t len);
#if (NGX_ZLIB)
static ssize_t ngx_http_log_gzip(ngx_fd_t fd, u_char *buf, size_t len,
ngx_int_t level, ngx_log_t *log);
static void *ngx_http_log_gzip_alloc(void *opaque, u_int items, u_int size);
static void ngx_http_log_gzip_free(void *opaque, void *address);
#endif
static void ngx_http_log_flush(ngx_open_file_t *file, ngx_log_t *log);
static void ngx_http_log_flush_handler(ngx_event_t *ev);
static u_char *ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_time(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_iso8601(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_msec(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_request_time(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_status(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_bytes_sent(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static u_char *ngx_http_log_body_bytes_sent(ngx_http_request_t *r,
u_char *buf, ngx_http_log_op_t *op);
static u_char *ngx_http_log_request_length(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static ngx_int_t ngx_http_log_variable_compile(ngx_conf_t *cf,
ngx_http_log_op_t *op, ngx_str_t *value);
static size_t ngx_http_log_variable_getlen(ngx_http_request_t *r,
uintptr_t data);
static u_char *ngx_http_log_variable(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
static uintptr_t ngx_http_log_escape(u_char *dst, u_char *src, size_t size);
static void *ngx_http_log_create_main_conf(ngx_conf_t *cf);
static void *ngx_http_log_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_log_merge_loc_conf(ngx_conf_t *cf, void *parent,
void *child);
static char *ngx_http_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_log_set_format(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_log_compile_format(ngx_conf_t *cf,
ngx_array_t *flushes, ngx_array_t *ops, ngx_array_t *args, ngx_uint_t s);
static char *ngx_http_log_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_int_t ngx_http_log_init(ngx_conf_t *cf);
static ngx_command_t ngx_http_log_commands[] = {
{ ngx_string("log_format"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_2MORE,
ngx_http_log_set_format,
NGX_HTTP_MAIN_CONF_OFFSET,
0,
NULL },
{ ngx_string("access_log"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_HTTP_LMT_CONF|NGX_CONF_1MORE,
ngx_http_log_set_log,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("open_log_file_cache"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234,
ngx_http_log_open_file_cache,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_log_module_ctx = {
NULL, /* preconfiguration */
ngx_http_log_init, /* postconfiguration */
ngx_http_log_create_main_conf, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_log_create_loc_conf, /* create location configuration */
ngx_http_log_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_log_module = {
NGX_MODULE_V1,
&ngx_http_log_module_ctx, /* module context */
ngx_http_log_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_str_t ngx_http_access_log = ngx_string(NGX_HTTP_LOG_PATH);
static ngx_str_t ngx_http_combined_fmt =
ngx_string("$remote_addr - $remote_user [$time_local] "
"\"$request\" $status $body_bytes_sent "
"\"$http_referer\" \"$http_user_agent\"");
static ngx_http_log_var_t ngx_http_log_vars[] = {
{ ngx_string("pipe"), 1, ngx_http_log_pipe },
{ ngx_string("time_local"), sizeof("28/Sep/1970:12:00:00 +0600") - 1,
ngx_http_log_time },
{ ngx_string("time_iso8601"), sizeof("1970-09-28T12:00:00+06:00") - 1,
ngx_http_log_iso8601 },
{ ngx_string("msec"), NGX_TIME_T_LEN + 4, ngx_http_log_msec },
{ ngx_string("request_time"), NGX_TIME_T_LEN + 4,
ngx_http_log_request_time },
{ ngx_string("status"), NGX_INT_T_LEN, ngx_http_log_status },
{ ngx_string("bytes_sent"), NGX_OFF_T_LEN, ngx_http_log_bytes_sent },
{ ngx_string("body_bytes_sent"), NGX_OFF_T_LEN,
ngx_http_log_body_bytes_sent },
{ ngx_string("request_length"), NGX_SIZE_T_LEN,
ngx_http_log_request_length },
{ ngx_null_string, 0, NULL }
};
static ngx_int_t
ngx_http_log_handler(ngx_http_request_t *r)
{
u_char *line, *p;
size_t len;
ngx_uint_t i, l;
ngx_http_log_t *log;
ngx_http_log_op_t *op;
ngx_http_log_buf_t *buffer;
ngx_http_log_loc_conf_t *lcf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http log handler");
lcf = ngx_http_get_module_loc_conf(r, ngx_http_log_module);
if (lcf->off) {
return NGX_OK;
}
log = lcf->logs->elts;
for (l = 0; l < lcf->logs->nelts; l++) {
if (ngx_time() == log[l].disk_full_time) {
/*
* on FreeBSD writing to a full filesystem with enabled softupdates
* may block process for much longer time than writing to non-full
* filesystem, so we skip writing to a log for one second
*/
continue;
}
ngx_http_script_flush_no_cacheable_variables(r, log[l].format->flushes);
len = 0;
op = log[l].format->ops->elts;
for (i = 0; i < log[l].format->ops->nelts; i++) {
if (op[i].len == 0) {
len += op[i].getlen(r, op[i].data);
} else {
len += op[i].len;
}
}
len += NGX_LINEFEED_SIZE;
buffer = log[l].file ? log[l].file->data : NULL;
if (buffer) {
if (len > (size_t) (buffer->last - buffer->pos)) {
ngx_http_log_write(r, &log[l], buffer->start,
buffer->pos - buffer->start);
buffer->pos = buffer->start;
}
if (len <= (size_t) (buffer->last - buffer->pos)) {
p = buffer->pos;
if (buffer->event && p == buffer->start) {
ngx_add_timer(buffer->event, buffer->flush);
}
for (i = 0; i < log[l].format->ops->nelts; i++) {
p = op[i].run(r, p, &op[i]);
}
ngx_linefeed(p);
buffer->pos = p;
continue;
}
if (buffer->event && buffer->event->timer_set) {
ngx_del_timer(buffer->event);
}
}
line = ngx_pnalloc(r->pool, len);
if (line == NULL) {
return NGX_ERROR;
}
p = line;
for (i = 0; i < log[l].format->ops->nelts; i++) {
p = op[i].run(r, p, &op[i]);
}
ngx_linefeed(p);
ngx_http_log_write(r, &log[l], line, p - line);
}
return NGX_OK;
}
static void
ngx_http_log_write(ngx_http_request_t *r, ngx_http_log_t *log, u_char *buf,
size_t len)
{
u_char *name;
time_t now;
ssize_t n;
ngx_err_t err;
#if (NGX_ZLIB)
ngx_http_log_buf_t *buffer;
#endif
if (log->script == NULL) {
name = log->file->name.data;
#if (NGX_ZLIB)
buffer = log->file->data;
if (buffer && buffer->gzip) {
n = ngx_http_log_gzip(log->file->fd, buf, len, buffer->gzip,
r->connection->log);
} else {
n = ngx_write_fd(log->file->fd, buf, len);
}
#else
n = ngx_write_fd(log->file->fd, buf, len);
#endif
} else {
name = NULL;
n = ngx_http_log_script_write(r, log->script, &name, buf, len);
}
if (n == (ssize_t) len) {
return;
}
now = ngx_time();
if (n == -1) {
err = ngx_errno;
if (err == NGX_ENOSPC) {
log->disk_full_time = now;
}
if (now - log->error_log_time > 59) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, err,
ngx_write_fd_n " to \"%s\" failed", name);
log->error_log_time = now;
}
return;
}
if (now - log->error_log_time > 59) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
ngx_write_fd_n " to \"%s\" was incomplete: %z of %uz",
name, n, len);
log->error_log_time = now;
}
}
static ssize_t
ngx_http_log_script_write(ngx_http_request_t *r, ngx_http_log_script_t *script,
u_char **name, u_char *buf, size_t len)
{
size_t root;
ssize_t n;
ngx_str_t log, path;
ngx_open_file_info_t of;
ngx_http_log_loc_conf_t *llcf;
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (!r->root_tested) {
/* test root directory existence */
if (ngx_http_map_uri_to_path(r, &path, &root, 0) == NULL) {
/* simulate successful logging */
return len;
}
path.data[root] = '\0';
ngx_memzero(&of, sizeof(ngx_open_file_info_t));
of.valid = clcf->open_file_cache_valid;
of.min_uses = clcf->open_file_cache_min_uses;
of.test_dir = 1;
of.test_only = 1;
of.errors = clcf->open_file_cache_errors;
of.events = clcf->open_file_cache_events;
if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
/* simulate successful logging */
return len;
}
if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
!= NGX_OK)
{
if (of.err == 0) {
/* simulate successful logging */
return len;
}
ngx_log_error(NGX_LOG_ERR, r->connection->log, of.err,
"testing \"%s\" existence failed", path.data);
/* simulate successful logging */
return len;
}
if (!of.is_dir) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_ENOTDIR,
"testing \"%s\" existence failed", path.data);
/* simulate successful logging */
return len;
}
}
if (ngx_http_script_run(r, &log, script->lengths->elts, 1,
script->values->elts)
== NULL)
{
/* simulate successful logging */
return len;
}
log.data[log.len - 1] = '\0';
*name = log.data;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http log \"%s\"", log.data);
llcf = ngx_http_get_module_loc_conf(r, ngx_http_log_module);
ngx_memzero(&of, sizeof(ngx_open_file_info_t));
of.log = 1;
of.valid = llcf->open_file_cache_valid;
of.min_uses = llcf->open_file_cache_min_uses;
of.directio = NGX_OPEN_FILE_DIRECTIO_OFF;
if (ngx_http_set_disable_symlinks(r, clcf, &log, &of) != NGX_OK) {
/* simulate successful logging */
return len;
}
if (ngx_open_cached_file(llcf->open_file_cache, &log, &of, r->pool)
!= NGX_OK)
{
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
"%s \"%s\" failed", of.failed, log.data);
/* simulate successful logging */
return len;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http log #%d", of.fd);
n = ngx_write_fd(of.fd, buf, len);
return n;
}
#if (NGX_ZLIB)
static ssize_t
ngx_http_log_gzip(ngx_fd_t fd, u_char *buf, size_t len, ngx_int_t level,
ngx_log_t *log)
{
int rc, wbits, memlevel;
u_char *out;
size_t size;
ssize_t n;
z_stream zstream;
ngx_err_t err;
ngx_pool_t *pool;
wbits = MAX_WBITS;
memlevel = MAX_MEM_LEVEL - 1;
while ((ssize_t) len < ((1 << (wbits - 1)) - 262)) {
wbits--;
memlevel--;
}
/*
* This is a formula from deflateBound() for conservative upper bound of
* compressed data plus 18 bytes of gzip wrapper.
*/
size = len + ((len + 7) >> 3) + ((len + 63) >> 6) + 5 + 18;
ngx_memzero(&zstream, sizeof(z_stream));
pool = ngx_create_pool(256, log);
if (pool == NULL) {
/* simulate successful logging */
return len;
}
pool->log = log;
zstream.zalloc = ngx_http_log_gzip_alloc;
zstream.zfree = ngx_http_log_gzip_free;
zstream.opaque = pool;
out = ngx_pnalloc(pool, size);
if (out == NULL) {
goto done;
}
zstream.next_in = buf;
zstream.avail_in = len;
zstream.next_out = out;
zstream.avail_out = size;
rc = deflateInit2(&zstream, (int) level, Z_DEFLATED, wbits + 16, memlevel,
Z_DEFAULT_STRATEGY);
if (rc != Z_OK) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "deflateInit2() failed: %d", rc);
goto done;
}
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, log, 0,
"deflate in: ni:%p no:%p ai:%ud ao:%ud",
zstream.next_in, zstream.next_out,
zstream.avail_in, zstream.avail_out);
rc = deflate(&zstream, Z_FINISH);
if (rc != Z_STREAM_END) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"deflate(Z_FINISH) failed: %d", rc);
goto done;
}
ngx_log_debug5(NGX_LOG_DEBUG_HTTP, log, 0,
"deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
zstream.next_in, zstream.next_out,
zstream.avail_in, zstream.avail_out,
rc);
size -= zstream.avail_out;
rc = deflateEnd(&zstream);
if (rc != Z_OK) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "deflateEnd() failed: %d", rc);
goto done;
}
n = ngx_write_fd(fd, out, size);
if (n != (ssize_t) size) {
err = (n == -1) ? ngx_errno : 0;
ngx_destroy_pool(pool);
ngx_set_errno(err);
return -1;
}
done:
ngx_destroy_pool(pool);
/* simulate successful logging */
return len;
}
static void *
ngx_http_log_gzip_alloc(void *opaque, u_int items, u_int size)
{
ngx_pool_t *pool = opaque;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pool->log, 0,
"gzip alloc: n:%ud s:%ud", items, size);
return ngx_palloc(pool, items * size);
}
static void
ngx_http_log_gzip_free(void *opaque, void *address)
{
#if 0
ngx_pool_t *pool = opaque;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pool->log, 0, "gzip free: %p", address);
#endif
}
#endif
static void
ngx_http_log_flush(ngx_open_file_t *file, ngx_log_t *log)
{
size_t len;
ssize_t n;
ngx_http_log_buf_t *buffer;
buffer = file->data;
len = buffer->pos - buffer->start;
if (len == 0) {
return;
}
#if (NGX_ZLIB)
if (buffer->gzip) {
n = ngx_http_log_gzip(file->fd, buffer->start, len, buffer->gzip, log);
} else {
n = ngx_write_fd(file->fd, buffer->start, len);
}
#else
n = ngx_write_fd(file->fd, buffer->start, len);
#endif
if (n == -1) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
ngx_write_fd_n " to \"%s\" failed",
file->name.data);
} else if ((size_t) n != len) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
ngx_write_fd_n " to \"%s\" was incomplete: %z of %uz",
file->name.data, n, len);
}
buffer->pos = buffer->start;
if (buffer->event && buffer->event->timer_set) {
ngx_del_timer(buffer->event);
}
}
static void
ngx_http_log_flush_handler(ngx_event_t *ev)
{
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"http log buffer flush handler");
ngx_http_log_flush(ev->data, ev->log);
}
static u_char *
ngx_http_log_copy_short(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op)
{
size_t len;
uintptr_t data;
len = op->len;
data = op->data;
while (len--) {
*buf++ = (u_char) (data & 0xff);
data >>= 8;
}
return buf;
}
static u_char *
ngx_http_log_copy_long(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op)
{
return ngx_cpymem(buf, (u_char *) op->data, op->len);
}
static u_char *
ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
{
if (r->pipeline) {
*buf = 'p';
} else {
*buf = '.';
}
return buf + 1;
}
static u_char *
ngx_http_log_time(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
{
return ngx_cpymem(buf, ngx_cached_http_log_time.data,
ngx_cached_http_log_time.len);
}
static u_char *
ngx_http_log_iso8601(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
{
return ngx_cpymem(buf, ngx_cached_http_log_iso8601.data,
ngx_cached_http_log_iso8601.len);
}
static u_char *
ngx_http_log_msec(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
{
ngx_time_t *tp;
tp = ngx_timeofday();
return ngx_sprintf(buf, "%T.%03M", tp->sec, tp->msec);
}
static u_char *
ngx_http_log_request_time(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op)
{
ngx_time_t *tp;
ngx_msec_int_t ms;
tp = ngx_timeofday();
ms = (ngx_msec_int_t)
((tp->sec - r->start_sec) * 1000 + (tp->msec - r->start_msec));
ms = ngx_max(ms, 0);
return ngx_sprintf(buf, "%T.%03M", ms / 1000, ms % 1000);
}
static u_char *
ngx_http_log_status(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
{
ngx_uint_t status;
if (r->err_status) {
status = r->err_status;
} else if (r->headers_out.status) {
status = r->headers_out.status;
} else if (r->http_version == NGX_HTTP_VERSION_9) {
status = 9;
} else {
status = 0;
}
return ngx_sprintf(buf, "%03ui", status);
}
static u_char *
ngx_http_log_bytes_sent(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op)
{
return ngx_sprintf(buf, "%O", r->connection->sent);
}
/*
* although there is a real $body_bytes_sent variable,
* this log operation code function is more optimized for logging
*/
static u_char *
ngx_http_log_body_bytes_sent(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op)
{
off_t length;
length = r->connection->sent - r->header_size;
if (length > 0) {
return ngx_sprintf(buf, "%O", length);
}
*buf = '0';
return buf + 1;
}
static u_char *
ngx_http_log_request_length(ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op)
{
return ngx_sprintf(buf, "%O", r->request_length);
}
static ngx_int_t
ngx_http_log_variable_compile(ngx_conf_t *cf, ngx_http_log_op_t *op,
ngx_str_t *value)
{
ngx_int_t index;
index = ngx_http_get_variable_index(cf, value);
if (index == NGX_ERROR) {
return NGX_ERROR;
}
op->len = 0;
op->getlen = ngx_http_log_variable_getlen;
op->run = ngx_http_log_variable;
op->data = index;
return NGX_OK;
}
static size_t
ngx_http_log_variable_getlen(ngx_http_request_t *r, uintptr_t data)
{
uintptr_t len;
ngx_http_variable_value_t *value;
value = ngx_http_get_indexed_variable(r, data);
if (value == NULL || value->not_found) {
return 1;
}
len = ngx_http_log_escape(NULL, value->data, value->len);
value->escape = len ? 1 : 0;
return value->len + len * 3;
}
static u_char *
ngx_http_log_variable(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
{
ngx_http_variable_value_t *value;
value = ngx_http_get_indexed_variable(r, op->data);
if (value == NULL || value->not_found) {
*buf = '-';
return buf + 1;
}
if (value->escape == 0) {
return ngx_cpymem(buf, value->data, value->len);
} else {
return (u_char *) ngx_http_log_escape(buf, value->data, value->len);
}
}
static uintptr_t
ngx_http_log_escape(u_char *dst, u_char *src, size_t size)
{
ngx_uint_t n;
static u_char hex[] = "0123456789ABCDEF";
static uint32_t escape[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0x00000004, /* 0000 0000 0000 0000 0000 0000 0000 0100 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x10000000, /* 0001 0000 0000 0000 0000 0000 0000 0000 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
if (dst == NULL) {
/* find the number of the characters to be escaped */
n = 0;
while (size) {
if (escape[*src >> 5] & (1 << (*src & 0x1f))) {
n++;
}
src++;
size--;
}
return (uintptr_t) n;
}
while (size) {
if (escape[*src >> 5] & (1 << (*src & 0x1f))) {
*dst++ = '\\';
*dst++ = 'x';
*dst++ = hex[*src >> 4];
*dst++ = hex[*src & 0xf];
src++;
} else {
*dst++ = *src++;
}
size--;
}
return (uintptr_t) dst;
}
static void *
ngx_http_log_create_main_conf(ngx_conf_t *cf)
{
ngx_http_log_main_conf_t *conf;
ngx_http_log_fmt_t *fmt;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_main_conf_t));
if (conf == NULL) {
return NULL;
}
if (ngx_array_init(&conf->formats, cf->pool, 4, sizeof(ngx_http_log_fmt_t))
!= NGX_OK)
{
return NULL;
}
fmt = ngx_array_push(&conf->formats);
if (fmt == NULL) {
return NULL;
}
ngx_str_set(&fmt->name, "combined");
fmt->flushes = NULL;
fmt->ops = ngx_array_create(cf->pool, 16, sizeof(ngx_http_log_op_t));
if (fmt->ops == NULL) {
return NULL;
}
return conf;
}
static void *
ngx_http_log_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_log_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_loc_conf_t));
if (conf == NULL) {
return NULL;
}
conf->open_file_cache = NGX_CONF_UNSET_PTR;
return conf;
}
static char *
ngx_http_log_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_log_loc_conf_t *prev = parent;
ngx_http_log_loc_conf_t *conf = child;
ngx_http_log_t *log;
ngx_http_log_fmt_t *fmt;
ngx_http_log_main_conf_t *lmcf;
if (conf->open_file_cache == NGX_CONF_UNSET_PTR) {
conf->open_file_cache = prev->open_file_cache;
conf->open_file_cache_valid = prev->open_file_cache_valid;
conf->open_file_cache_min_uses = prev->open_file_cache_min_uses;
if (conf->open_file_cache == NGX_CONF_UNSET_PTR) {
conf->open_file_cache = NULL;
}
}
if (conf->logs || conf->off) {
return NGX_CONF_OK;
}
conf->logs = prev->logs;
conf->off = prev->off;
if (conf->logs || conf->off) {
return NGX_CONF_OK;
}
conf->logs = ngx_array_create(cf->pool, 2, sizeof(ngx_http_log_t));
if (conf->logs == NULL) {
return NGX_CONF_ERROR;
}
log = ngx_array_push(conf->logs);
if (log == NULL) {
return NGX_CONF_ERROR;
}
log->file = ngx_conf_open_file(cf->cycle, &ngx_http_access_log);
if (log->file == NULL) {
return NGX_CONF_ERROR;
}
log->script = NULL;
log->disk_full_time = 0;
log->error_log_time = 0;
lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
fmt = lmcf->formats.elts;
/* the default "combined" format */
log->format = &fmt[0];
lmcf->combined_used = 1;
return NGX_CONF_OK;
}
static char *
ngx_http_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_log_loc_conf_t *llcf = conf;
ssize_t size;
ngx_int_t gzip;
ngx_uint_t i, n;
ngx_msec_t flush;
ngx_str_t *value, name, s;
ngx_http_log_t *log;
ngx_http_log_buf_t *buffer;
ngx_http_log_fmt_t *fmt;
ngx_http_log_main_conf_t *lmcf;
ngx_http_script_compile_t sc;
value = cf->args->elts;
if (ngx_strcmp(value[1].data, "off") == 0) {
llcf->off = 1;
if (cf->args->nelts == 2) {
return NGX_CONF_OK;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[2]);
return NGX_CONF_ERROR;
}
if (llcf->logs == NULL) {
llcf->logs = ngx_array_create(cf->pool, 2, sizeof(ngx_http_log_t));
if (llcf->logs == NULL) {
return NGX_CONF_ERROR;
}
}
lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
log = ngx_array_push(llcf->logs);
if (log == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(log, sizeof(ngx_http_log_t));
n = ngx_http_script_variables_count(&value[1]);
if (n == 0) {
log->file = ngx_conf_open_file(cf->cycle, &value[1]);
if (log->file == NULL) {
return NGX_CONF_ERROR;
}
} else {
if (ngx_conf_full_name(cf->cycle, &value[1], 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
log->script = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_script_t));
if (log->script == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
sc.cf = cf;
sc.source = &value[1];
sc.lengths = &log->script->lengths;
sc.values = &log->script->values;
sc.variables = n;
sc.complete_lengths = 1;
sc.complete_values = 1;
if (ngx_http_script_compile(&sc) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
if (cf->args->nelts >= 3) {
name = value[2];
if (ngx_strcmp(name.data, "combined") == 0) {
lmcf->combined_used = 1;
}
} else {
ngx_str_set(&name, "combined");
lmcf->combined_used = 1;
}
fmt = lmcf->formats.elts;
for (i = 0; i < lmcf->formats.nelts; i++) {
if (fmt[i].name.len == name.len
&& ngx_strcasecmp(fmt[i].name.data, name.data) == 0)
{
log->format = &fmt[i];
break;
}
}
if (log->format == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unknown log format \"%V\"", &name);
return NGX_CONF_ERROR;
}
size = 0;
flush = 0;
gzip = 0;
for (i = 3; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "buffer=", 7) == 0) {
s.len = value[i].len - 7;
s.data = value[i].data + 7;
size = ngx_parse_size(&s);
if (size == NGX_ERROR || size == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid buffer size \"%V\"", &s);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "flush=", 6) == 0) {
s.len = value[i].len - 6;
s.data = value[i].data + 6;
flush = ngx_parse_time(&s, 0);
if (flush == (ngx_msec_t) NGX_ERROR || flush == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid flush time \"%V\"", &s);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "gzip", 4) == 0
&& (value[i].len == 4 || value[i].data[4] == '='))
{
#if (NGX_ZLIB)
if (size == 0) {
size = 64 * 1024;
}
if (value[i].len == 4) {
gzip = Z_BEST_SPEED;
continue;
}
s.len = value[i].len - 5;
s.data = value[i].data + 5;
gzip = ngx_atoi(s.data, s.len);
if (gzip < 1 || gzip > 9) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid compression level \"%V\"", &s);
return NGX_CONF_ERROR;
}
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"nginx was built without zlib support");
return NGX_CONF_ERROR;
#endif
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (flush && size == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"no buffer is defined for access_log \"%V\"",
&value[1]);
return NGX_CONF_ERROR;
}
if (size) {
if (log->script) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"buffered logs cannot have variables in name");
return NGX_CONF_ERROR;
}
if (log->file->data) {
buffer = log->file->data;
if (buffer->last - buffer->start != size
|| buffer->flush != flush
|| buffer->gzip != gzip)
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"access_log \"%V\" already defined "
"with conflicting parameters",
&value[1]);
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
buffer = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_buf_t));
if (buffer == NULL) {
return NGX_CONF_ERROR;
}
buffer->start = ngx_pnalloc(cf->pool, size);
if (buffer->start == NULL) {
return NGX_CONF_ERROR;
}
buffer->pos = buffer->start;
buffer->last = buffer->start + size;
if (flush) {
buffer->event = ngx_pcalloc(cf->pool, sizeof(ngx_event_t));
if (buffer->event == NULL) {
return NGX_CONF_ERROR;
}
buffer->event->data = log->file;
buffer->event->handler = ngx_http_log_flush_handler;
buffer->event->log = &cf->cycle->new_log;
buffer->flush = flush;
}
buffer->gzip = gzip;
log->file->flush = ngx_http_log_flush;
log->file->data = buffer;
}
return NGX_CONF_OK;
}
static char *
ngx_http_log_set_format(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_log_main_conf_t *lmcf = conf;
ngx_str_t *value;
ngx_uint_t i;
ngx_http_log_fmt_t *fmt;
if (cf->cmd_type != NGX_HTTP_MAIN_CONF) {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"the \"log_format\" directive may be used "
"only on \"http\" level");
}
value = cf->args->elts;
fmt = lmcf->formats.elts;
for (i = 0; i < lmcf->formats.nelts; i++) {
if (fmt[i].name.len == value[1].len
&& ngx_strcmp(fmt[i].name.data, value[1].data) == 0)
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"duplicate \"log_format\" name \"%V\"",
&value[1]);
return NGX_CONF_ERROR;
}
}
fmt = ngx_array_push(&lmcf->formats);
if (fmt == NULL) {
return NGX_CONF_ERROR;
}
fmt->name = value[1];
fmt->flushes = ngx_array_create(cf->pool, 4, sizeof(ngx_int_t));
if (fmt->flushes == NULL) {
return NGX_CONF_ERROR;
}
fmt->ops = ngx_array_create(cf->pool, 16, sizeof(ngx_http_log_op_t));
if (fmt->ops == NULL) {
return NGX_CONF_ERROR;
}
return ngx_http_log_compile_format(cf, fmt->flushes, fmt->ops, cf->args, 2);
}
static char *
ngx_http_log_compile_format(ngx_conf_t *cf, ngx_array_t *flushes,
ngx_array_t *ops, ngx_array_t *args, ngx_uint_t s)
{
u_char *data, *p, ch;
size_t i, len;
ngx_str_t *value, var;
ngx_int_t *flush;
ngx_uint_t bracket;
ngx_http_log_op_t *op;
ngx_http_log_var_t *v;
value = args->elts;
for ( /* void */ ; s < args->nelts; s++) {
i = 0;
while (i < value[s].len) {
op = ngx_array_push(ops);
if (op == NULL) {
return NGX_CONF_ERROR;
}
data = &value[s].data[i];
if (value[s].data[i] == '$') {
if (++i == value[s].len) {
goto invalid;
}
if (value[s].data[i] == '{') {
bracket = 1;
if (++i == value[s].len) {
goto invalid;
}
var.data = &value[s].data[i];
} else {
bracket = 0;
var.data = &value[s].data[i];
}
for (var.len = 0; i < value[s].len; i++, var.len++) {
ch = value[s].data[i];
if (ch == '}' && bracket) {
i++;
bracket = 0;
break;
}
if ((ch >= 'A' && ch <= 'Z')
|| (ch >= 'a' && ch <= 'z')
|| (ch >= '0' && ch <= '9')
|| ch == '_')
{
continue;
}
break;
}
if (bracket) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the closing bracket in \"%V\" "
"variable is missing", &var);
return NGX_CONF_ERROR;
}
if (var.len == 0) {
goto invalid;
}
for (v = ngx_http_log_vars; v->name.len; v++) {
if (v->name.len == var.len
&& ngx_strncmp(v->name.data, var.data, var.len) == 0)
{
op->len = v->len;
op->getlen = NULL;
op->run = v->run;
op->data = 0;
goto found;
}
}
if (ngx_http_log_variable_compile(cf, op, &var) != NGX_OK) {
return NGX_CONF_ERROR;
}
if (flushes) {
flush = ngx_array_push(flushes);
if (flush == NULL) {
return NGX_CONF_ERROR;
}
*flush = op->data; /* variable index */
}
found:
continue;
}
i++;
while (i < value[s].len && value[s].data[i] != '$') {
i++;
}
len = &value[s].data[i] - data;
if (len) {
op->len = len;
op->getlen = NULL;
if (len <= sizeof(uintptr_t)) {
op->run = ngx_http_log_copy_short;
op->data = 0;
while (len--) {
op->data <<= 8;
op->data |= data[len];
}
} else {
op->run = ngx_http_log_copy_long;
p = ngx_pnalloc(cf->pool, len);
if (p == NULL) {
return NGX_CONF_ERROR;
}
ngx_memcpy(p, data, len);
op->data = (uintptr_t) p;
}
}
}
}
return NGX_CONF_OK;
invalid:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%s\"", data);
return NGX_CONF_ERROR;
}
static char *
ngx_http_log_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_log_loc_conf_t *llcf = conf;
time_t inactive, valid;
ngx_str_t *value, s;
ngx_int_t max, min_uses;
ngx_uint_t i;
if (llcf->open_file_cache != NGX_CONF_UNSET_PTR) {
return "is duplicate";
}
value = cf->args->elts;
max = 0;
inactive = 10;
valid = 60;
min_uses = 1;
for (i = 1; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "max=", 4) == 0) {
max = ngx_atoi(value[i].data + 4, value[i].len - 4);
if (max == NGX_ERROR) {
goto failed;
}
continue;
}
if (ngx_strncmp(value[i].data, "inactive=", 9) == 0) {
s.len = value[i].len - 9;
s.data = value[i].data + 9;
inactive = ngx_parse_time(&s, 1);
if (inactive == (time_t) NGX_ERROR) {
goto failed;
}
continue;
}
if (ngx_strncmp(value[i].data, "min_uses=", 9) == 0) {
min_uses = ngx_atoi(value[i].data + 9, value[i].len - 9);
if (min_uses == NGX_ERROR) {
goto failed;
}
continue;
}
if (ngx_strncmp(value[i].data, "valid=", 6) == 0) {
s.len = value[i].len - 6;
s.data = value[i].data + 6;
valid = ngx_parse_time(&s, 1);
if (valid == (time_t) NGX_ERROR) {
goto failed;
}
continue;
}
if (ngx_strcmp(value[i].data, "off") == 0) {
llcf->open_file_cache = NULL;
continue;
}
failed:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid \"open_log_file_cache\" parameter \"%V\"",
&value[i]);
return NGX_CONF_ERROR;
}
if (llcf->open_file_cache == NULL) {
return NGX_CONF_OK;
}
if (max == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"open_log_file_cache\" must have \"max\" parameter");
return NGX_CONF_ERROR;
}
llcf->open_file_cache = ngx_open_file_cache_init(cf->pool, max, inactive);
if (llcf->open_file_cache) {
llcf->open_file_cache_valid = valid;
llcf->open_file_cache_min_uses = min_uses;
return NGX_CONF_OK;
}
return NGX_CONF_ERROR;
}
static ngx_int_t
ngx_http_log_init(ngx_conf_t *cf)
{
ngx_str_t *value;
ngx_array_t a;
ngx_http_handler_pt *h;
ngx_http_log_fmt_t *fmt;
ngx_http_log_main_conf_t *lmcf;
ngx_http_core_main_conf_t *cmcf;
lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
if (lmcf->combined_used) {
if (ngx_array_init(&a, cf->pool, 1, sizeof(ngx_str_t)) != NGX_OK) {
return NGX_ERROR;
}
value = ngx_array_push(&a);
if (value == NULL) {
return NGX_ERROR;
}
*value = ngx_http_combined_fmt;
fmt = lmcf->formats.elts;
if (ngx_http_log_compile_format(cf, NULL, fmt->ops, &a, 0)
!= NGX_CONF_OK)
{
return NGX_ERROR;
}
}
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
h = ngx_array_push(&cmcf->phases[NGX_HTTP_LOG_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_log_handler;
return NGX_OK;
}