nginx/src/http/ngx_http_log_handler.c

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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <nginx.h>
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static u_char *ngx_http_log_addr(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
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static u_char *ngx_http_log_connection(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
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static u_char *ngx_http_log_time(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_request(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
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static u_char *ngx_http_log_status(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_length(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_apache_length(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_header_in(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_connection_header_out(ngx_http_request_t *r,
u_char *buf, uintptr_t data);
static u_char *ngx_http_log_transfer_encoding_header_out(ngx_http_request_t *r,
u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_unknown_header_in(ngx_http_request_t *r,
u_char *buf, uintptr_t data);
static u_char *ngx_http_log_header_out(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static u_char *ngx_http_log_unknown_header_out(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
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static ngx_int_t ngx_http_log_pre_conf(ngx_conf_t *cf);
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);
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static ngx_int_t ngx_http_log_parse_format(ngx_conf_t *cf, ngx_array_t *ops,
ngx_str_t *line);
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_CONF_TAKE12,
ngx_http_log_set_log,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL},
ngx_null_command
};
ngx_http_module_t ngx_http_log_module_ctx = {
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ngx_http_log_pre_conf, /* pre conf */
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 configration */
ngx_http_log_merge_loc_conf /* merge location configration */
};
ngx_module_t ngx_http_log_module = {
NGX_MODULE,
&ngx_http_log_module_ctx, /* module context */
ngx_http_log_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init module */
NULL /* init child */
};
static ngx_str_t http_access_log = ngx_string("access.log");
static ngx_str_t ngx_http_combined_fmt =
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ngx_string("%addr - - [%time] \"%request\" %status %apache_length "
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"\"%{Referer}i\" \"%{User-Agent}i\"");
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ngx_http_log_op_name_t ngx_http_log_fmt_ops[] = {
{ ngx_string("addr"), INET_ADDRSTRLEN - 1, ngx_http_log_addr },
{ ngx_string("conn"), NGX_INT32_LEN, ngx_http_log_connection },
{ ngx_string("pipe"), 1, ngx_http_log_pipe },
{ ngx_string("time"), sizeof("28/Sep/1970:12:00:00") - 1,
ngx_http_log_time },
{ ngx_string("request"), 0, ngx_http_log_request },
{ ngx_string("status"), 3, ngx_http_log_status },
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{ ngx_string("length"), NGX_OFF_T_LEN, ngx_http_log_length },
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{ ngx_string("apache_length"), NGX_OFF_T_LEN, ngx_http_log_apache_length },
{ ngx_string("i"), NGX_HTTP_LOG_ARG, ngx_http_log_header_in },
{ ngx_string("o"), NGX_HTTP_LOG_ARG, ngx_http_log_header_out },
{ ngx_null_string, 0, NULL }
};
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ngx_int_t ngx_http_log_handler(ngx_http_request_t *r)
{
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ngx_uint_t i, l;
uintptr_t data;
u_char *line, *p;
size_t len;
ngx_http_log_t *log;
ngx_http_log_op_t *op;
ngx_http_log_loc_conf_t *lcf;
#if (WIN32)
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u_long written;
#endif
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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);
log = lcf->logs->elts;
for (l = 0; l < lcf->logs->nelts; l++) {
len = 0;
op = log[l].ops->elts;
for (i = 0; i < log[l].ops->nelts; i++) {
if (op[i].len == 0) {
len += (size_t) op[i].op(r, NULL, op[i].data);
} else {
len += op[i].len;
}
}
#if (WIN32)
len += 2;
#else
len++;
#endif
ngx_test_null(line, ngx_palloc(r->pool, len), NGX_ERROR);
p = line;
for (i = 0; i < log[l].ops->nelts; i++) {
if (op[i].op == NGX_HTTP_LOG_COPY_SHORT) {
len = op[i].len;
data = op[i].data;
while (len--) {
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*p++ = (char) (data & 0xff);
data >>= 8;
}
} else if (op[i].op == NGX_HTTP_LOG_COPY_LONG) {
p = ngx_cpymem(p, (void *) op[i].data, op[i].len);
} else {
p = op[i].op(r, p, op[i].data);
}
}
#if (WIN32)
*p++ = CR; *p++ = LF;
WriteFile(log[l].file->fd, line, p - line, &written, NULL);
#else
*p++ = LF;
write(log[l].file->fd, line, p - line);
#endif
}
return NGX_OK;
}
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static u_char *ngx_http_log_addr(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
return ngx_cpymem(buf, r->connection->addr_text.data,
r->connection->addr_text.len);
}
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static u_char *ngx_http_log_connection(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
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return buf + ngx_snprintf((char *) buf, NGX_INT_T_LEN + 1,
"%" NGX_UINT_T_FMT,
r->connection->number);
}
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static u_char *ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
if (r->pipeline) {
*buf = 'p';
} else {
*buf = '.';
}
return buf + 1;
}
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static u_char *ngx_http_log_time(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
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return ngx_cpymem(buf, ngx_cached_http_log_time.data,
ngx_cached_http_log_time.len);
}
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static u_char *ngx_http_log_request(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
if (buf == NULL) {
/* find the request line length */
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return (u_char *) r->request_line.len;
}
return ngx_cpymem(buf, r->request_line.data, r->request_line.len);
}
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static u_char *ngx_http_log_status(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
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return buf + ngx_snprintf((char *) buf, 4, "%" NGX_UINT_T_FMT,
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r->err_status ? r->err_status : r->headers_out.status);
}
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static u_char *ngx_http_log_length(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
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return buf + ngx_snprintf((char *) buf, NGX_OFF_T_LEN + 1, OFF_T_FMT,
r->connection->sent);
}
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static u_char *ngx_http_log_apache_length(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
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{
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return buf + ngx_snprintf((char *) buf, NGX_OFF_T_LEN + 1, OFF_T_FMT,
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r->connection->sent - r->header_size);
}
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static u_char *ngx_http_log_header_in(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
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ngx_uint_t i;
ngx_str_t *s;
ngx_table_elt_t *h;
ngx_http_log_op_t *op;
if (r) {
h = *(ngx_table_elt_t **) ((char *) &r->headers_in + data);
if (h == NULL) {
/* no header */
if (buf) {
*buf = '-';
}
return buf + 1;
}
if (buf == NULL) {
/* find the header length */
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return (u_char *) h->value.len;
}
return ngx_cpymem(buf, h->value.data, h->value.len);
}
/* find an offset while a format string compilation */
op = (ngx_http_log_op_t *) buf;
s = (ngx_str_t *) data;
op->len = 0;
for (i = 0; ngx_http_headers_in[i].name.len != 0; i++) {
if (ngx_http_headers_in[i].name.len != s->len) {
continue;
}
if (ngx_strncasecmp(ngx_http_headers_in[i].name.data, s->data, s->len)
== 0)
{
op->op = ngx_http_log_header_in;
op->data = ngx_http_headers_in[i].offset;
return NULL;
}
}
op->op = ngx_http_log_unknown_header_in;
op->data = (uintptr_t) s;
return NULL;
}
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static u_char *ngx_http_log_unknown_header_in(ngx_http_request_t *r,
u_char *buf, uintptr_t data)
{
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ngx_uint_t i;
ngx_str_t *s;
ngx_table_elt_t *h;
s = (ngx_str_t *) data;
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h = r->headers_in.headers.elts;
for (i = 0; i < r->headers_in.headers.nelts; i++) {
if (h[i].key.len != s->len) {
continue;
}
if (ngx_strncasecmp(h[i].key.data, s->data, s->len) == 0) {
if (buf == NULL) {
/* find the header length */
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return (u_char *) h[i].value.len;
}
return ngx_cpymem(buf, h[i].value.data, h[i].value.len);
}
}
/* no header */
if (buf) {
*buf = '-';
}
return buf + 1;
}
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static u_char *ngx_http_log_header_out(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
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ngx_uint_t i;
ngx_str_t *s;
ngx_table_elt_t *h;
ngx_http_log_op_t *op;
if (r) {
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/* run-time execution */
if (r->http_version < NGX_HTTP_VERSION_10) {
if (buf) {
*buf = '-';
}
return buf + 1;
}
h = *(ngx_table_elt_t **) ((char *) &r->headers_out + data);
if (h == NULL) {
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/*
* No header pointer was found.
* However, some headers: "Date", "Server", "Content-Length",
* and "Last-Modified" have a special handling in the header filter
* but we do not set up their pointers in the filter because
* they are too seldom needed to be logged.
*/
if (data == offsetof(ngx_http_headers_out_t, date)) {
if (buf == NULL) {
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return (u_char *) ngx_cached_http_time.len;
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}
return ngx_cpymem(buf, ngx_cached_http_time.data,
ngx_cached_http_time.len);
}
if (data == offsetof(ngx_http_headers_out_t, server)) {
if (buf == NULL) {
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return (u_char *) (sizeof(NGINX_VER) - 1);
}
return ngx_cpymem(buf, NGINX_VER, sizeof(NGINX_VER) - 1);
}
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if (data == offsetof(ngx_http_headers_out_t, content_length)) {
if (r->headers_out.content_length_n == -1) {
if (buf) {
*buf = '-';
}
return buf + 1;
}
if (buf == NULL) {
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return (u_char *) NGX_OFF_T_LEN;
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}
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return buf + ngx_snprintf((char *) buf,
NGX_OFF_T_LEN + 2, OFF_T_FMT,
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r->headers_out.content_length_n);
}
if (data == offsetof(ngx_http_headers_out_t, last_modified)) {
if (r->headers_out.last_modified_time == -1) {
if (buf) {
*buf = '-';
}
return buf + 1;
}
if (buf == NULL) {
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return (u_char *)
sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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}
return buf + ngx_http_time(buf,
r->headers_out.last_modified_time);
}
if (buf) {
*buf = '-';
}
return buf + 1;
}
if (buf == NULL) {
/* find the header length */
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return (u_char *) h->value.len;
}
return ngx_cpymem(buf, h->value.data, h->value.len);
}
/* find an offset while a format string compilation */
op = (ngx_http_log_op_t *) buf;
s = (ngx_str_t *) data;
op->len = 0;
for (i = 0; ngx_http_headers_out[i].name.len != 0; i++) {
if (ngx_http_headers_out[i].name.len != s->len) {
continue;
}
if (ngx_strncasecmp(ngx_http_headers_out[i].name.data, s->data, s->len)
== 0)
{
op->op = ngx_http_log_header_out;
op->data = ngx_http_headers_out[i].offset;
return NULL;
}
}
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if (s->len == sizeof("Connection") - 1
&& ngx_strncasecmp(s->data, "Connection", s->len) == 0)
{
op->op = ngx_http_log_connection_header_out;
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op->data = (uintptr_t) NULL;
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return NULL;
}
if (s->len == sizeof("Transfer-Encoding") - 1
&& ngx_strncasecmp(s->data, "Transfer-Encoding", s->len) == 0) {
op->op = ngx_http_log_transfer_encoding_header_out;
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op->data = (uintptr_t) NULL;
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return NULL;
}
op->op = ngx_http_log_unknown_header_out;
op->data = (uintptr_t) s;
return NULL;
}
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static u_char *ngx_http_log_connection_header_out(ngx_http_request_t *r,
u_char *buf, uintptr_t data)
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{
if (buf == NULL) {
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return (u_char *) ((r->keepalive) ? sizeof("keep-alive") - 1:
sizeof("close") - 1);
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}
if (r->keepalive) {
return ngx_cpymem(buf, "keep-alive", sizeof("keep-alive") - 1);
} else {
return ngx_cpymem(buf, "close", sizeof("close") - 1);
}
}
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static u_char *ngx_http_log_transfer_encoding_header_out(ngx_http_request_t *r,
u_char *buf,
uintptr_t data)
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{
if (buf == NULL) {
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return (u_char *) ((r->chunked) ? sizeof("chunked") - 1 : 1);
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}
if (r->chunked) {
return ngx_cpymem(buf, "chunked", sizeof("chunked") - 1);
}
*buf = '-';
return buf + 1;
}
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static u_char *ngx_http_log_unknown_header_out(ngx_http_request_t *r,
u_char *buf,
uintptr_t data)
{
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ngx_uint_t i;
ngx_str_t *s;
ngx_table_elt_t *h;
s = (ngx_str_t *) data;
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h = r->headers_out.headers.elts;
for (i = 0; i < r->headers_out.headers.nelts; i++) {
if (h[i].key.len != s->len) {
continue;
}
if (ngx_strncasecmp(h[i].key.data, s->data, s->len) == 0) {
if (buf == NULL) {
/* find the header length */
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return (u_char *) h[i].value.len;
}
return ngx_cpymem(buf, h[i].value.data, h[i].value.len);
}
}
/* no header */
if (buf) {
*buf = '-';
}
return buf + 1;
}
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static ngx_int_t ngx_http_log_pre_conf(ngx_conf_t *cf)
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{
ngx_http_log_op_name_t *op;
for (op = ngx_http_log_fmt_ops; op->name.len; op++) { /* void */ }
op->op = NULL;
return NGX_OK;
}
static void *ngx_http_log_create_main_conf(ngx_conf_t *cf)
{
ngx_http_log_main_conf_t *conf;
char *rc;
ngx_str_t *value;
if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_main_conf_t)))) {
return NGX_CONF_ERROR;
}
ngx_init_array(conf->formats, cf->pool, 5, sizeof(ngx_http_log_fmt_t),
NGX_CONF_ERROR);
cf->args->nelts = 0;
if (!(value = ngx_push_array(cf->args))) {
return NGX_CONF_ERROR;
}
if (!(value = ngx_push_array(cf->args))) {
return NGX_CONF_ERROR;
}
value->len = sizeof("combined") - 1;
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value->data = (u_char *) "combined";
if (!(value = ngx_push_array(cf->args))) {
return NGX_CONF_ERROR;
}
*value = ngx_http_combined_fmt;
rc = ngx_http_log_set_format(cf, NULL, conf);
if (rc != NGX_CONF_OK) {
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return NULL;
}
return conf;
}
static void *ngx_http_log_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_log_loc_conf_t *conf;
ngx_test_null(conf, ngx_pcalloc(cf->pool, sizeof(ngx_http_log_loc_conf_t)),
NGX_CONF_ERROR);
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->logs == NULL) {
if (prev->logs) {
conf->logs = prev->logs;
} else {
conf->logs = ngx_create_array(cf->pool, 2, sizeof(ngx_http_log_t));
if (conf->logs == NULL) {
return NGX_CONF_ERROR;
}
if (!(log = ngx_push_array(conf->logs))) {
return NGX_CONF_ERROR;
}
log->file = ngx_conf_open_file(cf->cycle, &http_access_log);
if (log->file == NULL) {
return NGX_CONF_ERROR;
}
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lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
fmt = lmcf->formats.elts;
/* the default "combined" format */
log->ops = fmt[0].ops;
}
}
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;
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ngx_uint_t i;
ngx_str_t *value, name;
ngx_http_log_t *log;
ngx_http_log_fmt_t *fmt;
ngx_http_log_main_conf_t *lmcf;
if (llcf->logs == NULL) {
if (!(llcf->logs = ngx_create_array(cf->pool, 2,
sizeof(ngx_http_log_t)))) {
return NGX_CONF_ERROR;
}
}
value = cf->args->elts;
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lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
if (!(log = ngx_push_array(llcf->logs))) {
return NGX_CONF_ERROR;
}
if (!(log->file = ngx_conf_open_file(cf->cycle, &value[1]))) {
return NGX_CONF_ERROR;
}
if (cf->args->nelts == 3) {
name = value[2];
} else {
name.len = sizeof("combined") - 1;
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name.data = (u_char *) "combined";
}
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->ops = fmt[i].ops;
return NGX_CONF_OK;
}
}
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;
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ngx_uint_t s, f, invalid;
u_char *data, *p, *fname;
size_t i, len, fname_len;
ngx_str_t *value, arg, *a;
ngx_http_log_op_t *op;
ngx_http_log_fmt_t *fmt;
ngx_http_log_op_name_t *name;
value = cf->args->elts;
fmt = lmcf->formats.elts;
for (f = 0; f < lmcf->formats.nelts; f++) {
if (fmt[f].name.len == value[1].len
&& ngx_strcmp(fmt->name.data, value[1].data) == 0)
{
return "duplicate \"log_format\" name";
}
}
if (!(fmt = ngx_push_array(&lmcf->formats))) {
return NGX_CONF_ERROR;
}
fmt->name = value[1];
if (!(fmt->ops = ngx_create_array(cf->pool, 20,
sizeof(ngx_http_log_op_t)))) {
return NGX_CONF_ERROR;
}
invalid = 0;
data = NULL;
for (s = 2; s < cf->args->nelts && !invalid; s++) {
i = 0;
while (i < value[s].len) {
if (!(op = ngx_push_array(fmt->ops))) {
return NGX_CONF_ERROR;
}
data = &value[s].data[i];
if (value[s].data[i] == '%') {
i++;
if (i == value[s].len) {
invalid = 1;
break;
}
if (value[s].data[i] == '{') {
i++;
arg.data = &value[s].data[i];
while (i < value[s].len && value[s].data[i] != '}') {
i++;
}
arg.len = &value[s].data[i] - arg.data;
if (i == value[s].len || arg.len == 0) {
invalid = 1;
break;
}
i++;
} else {
arg.len = 0;
}
fname = &value[s].data[i];
while (i < value[s].len
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&& ((value[s].data[i] >= 'a' && value[s].data[i] <= 'z')
|| value[s].data[i] == '_'))
{
i++;
}
fname_len = &value[s].data[i] - fname;
if (fname_len == 0) {
invalid = 1;
break;
}
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for (name = ngx_http_log_fmt_ops; name->op; name++) {
if (name->name.len == 0) {
name = (ngx_http_log_op_name_t *) name->op;
}
if (name->name.len == fname_len
&& ngx_strncmp(name->name.data, fname, fname_len) == 0)
{
if (name->len != NGX_HTTP_LOG_ARG) {
if (arg.len) {
fname[fname_len] = '\0';
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%s\" must not have argument",
data);
return NGX_CONF_ERROR;
}
op->len = name->len;
op->op = name->op;
op->data = 0;
break;
}
if (arg.len == 0) {
fname[fname_len] = '\0';
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%s\" requires argument",
data);
return NGX_CONF_ERROR;
}
if (!(a = ngx_palloc(cf->pool, sizeof(ngx_str_t)))) {
return NGX_CONF_ERROR;
}
*a = arg;
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name->op(NULL, (u_char *) op, (uintptr_t) a);
break;
}
}
if (name->name.len == 0) {
invalid = 1;
break;
}
} else {
i++;
while (i < value[s].len && value[s].data[i] != '%') {
i++;
}
len = &value[s].data[i] - data;
if (len) {
op->len = len;
if (len <= sizeof(uintptr_t)) {
op->op = NGX_HTTP_LOG_COPY_SHORT;
op->data = 0;
while (len--) {
op->data <<= 8;
op->data |= data[len];
}
} else {
op->op = NGX_HTTP_LOG_COPY_LONG;
if (!(p = ngx_palloc(cf->pool, len))) {
return NGX_CONF_ERROR;
}
ngx_memcpy(p, data, len);
op->data = (uintptr_t) p;
}
}
}
}
}
if (invalid) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%s\"", data);
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}