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ngx_conf_file.c
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// annotated by chrono since 2016
//
// * ngx_conf_handler
// * ngx_conf_read_token
// * ngx_conf_full_name
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#define NGX_CONF_BUFFER 4096
// 给-T用，dump配置文件内容
static ngx_int_t ngx_conf_add_dump(ngx_conf_t *cf, ngx_str_t *filename);
// 在所有模块里查找匹配的指令，进行解析
static ngx_int_t ngx_conf_handler(ngx_conf_t *cf, ngx_int_t last);
// 从配置文件里读取token,保存在cf->args数组里
static ngx_int_t ngx_conf_read_token(ngx_conf_t *cf);
static void ngx_conf_flush_files(ngx_cycle_t *cycle);
// conf模块唯一的指令，包含其他配置文件
static ngx_command_t ngx_conf_commands[] = {
{ ngx_string("include"),
NGX_ANY_CONF|NGX_CONF_TAKE1,
ngx_conf_include,
0,
0,
NULL },
ngx_null_command
};
// conf模块没有其他的函数，功能较简单
ngx_module_t ngx_conf_module = {
NGX_MODULE_V1,
NULL, /* module context */
ngx_conf_commands, /* module directives */
NGX_CONF_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
ngx_conf_flush_files, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
/* The eight fixed arguments */
// 参数数量转换为NGX_CONF_TAKE宏
// 相当于map
// 0 => NGX_CONF_NOARGS
// 1 => NGX_CONF_TAKE1
static ngx_uint_t argument_number[] = {
NGX_CONF_NOARGS,
NGX_CONF_TAKE1,
NGX_CONF_TAKE2,
NGX_CONF_TAKE3,
NGX_CONF_TAKE4,
NGX_CONF_TAKE5,
NGX_CONF_TAKE6,
NGX_CONF_TAKE7
};
// 解析-g传递的命令行参数
char *
ngx_conf_param(ngx_conf_t *cf)
{
char *rv;
ngx_str_t *param;
ngx_buf_t b;
ngx_conf_file_t conf_file;
// 获取-g传递的命令行参数
param = &cf->cycle->conf_param;
if (param->len == 0) {
return NGX_CONF_OK;
}
ngx_memzero(&conf_file, sizeof(ngx_conf_file_t));
ngx_memzero(&b, sizeof(ngx_buf_t));
// buffer内容是命令行参数
b.start = param->data;
b.pos = param->data;
b.last = param->data + param->len;
b.end = b.last;
b.temporary = 1;
// 没有配置文件
conf_file.file.fd = NGX_INVALID_FILE;
conf_file.file.name.data = NULL;
conf_file.line = 0;
// 设置解析的环境
cf->conf_file = &conf_file;
cf->conf_file->buffer = &b;
// 进行解析，type = parse_param
rv = ngx_conf_parse(cf, NULL);
// 解析完成，恢复原状
cf->conf_file = NULL;
return rv;
}
// 给-T用，dump配置文件内容
static ngx_int_t
ngx_conf_add_dump(ngx_conf_t *cf, ngx_str_t *filename)
{
off_t size;
u_char *p;
uint32_t hash;
ngx_buf_t *buf;
ngx_str_node_t *sn;
ngx_conf_dump_t *cd;
hash = ngx_crc32_long(filename->data, filename->len);
sn = ngx_str_rbtree_lookup(&cf->cycle->config_dump_rbtree, filename, hash);
if (sn) {
cf->conf_file->dump = NULL;
return NGX_OK;
}
p = ngx_pstrdup(cf->cycle->pool, filename);
if (p == NULL) {
return NGX_ERROR;
}
cd = ngx_array_push(&cf->cycle->config_dump);
if (cd == NULL) {
return NGX_ERROR;
}
size = ngx_file_size(&cf->conf_file->file.info);
buf = ngx_create_temp_buf(cf->cycle->pool, (size_t) size);
if (buf == NULL) {
return NGX_ERROR;
}
cd->name.data = p;
cd->name.len = filename->len;
cd->buffer = buf;
cf->conf_file->dump = buf;
sn = ngx_palloc(cf->temp_pool, sizeof(ngx_str_node_t));
if (sn == NULL) {
return NGX_ERROR;
}
sn->node.key = hash;
sn->str = cd->name;
ngx_rbtree_insert(&cf->cycle->config_dump_rbtree, &sn->node);
return NGX_OK;
}
// 解析配置，参数filename可以是空
char *
ngx_conf_parse(ngx_conf_t *cf, ngx_str_t *filename)
{
char *rv;
ngx_fd_t fd;
ngx_int_t rc;
ngx_buf_t buf;
ngx_conf_file_t *prev, conf_file;
enum {
parse_file = 0,
parse_block,
parse_param
} type;
#if (NGX_SUPPRESS_WARN)
fd = NGX_INVALID_FILE;
prev = NULL;
#endif
// 有文件名，解析文件
if (filename) {
/* open configuration file */
fd = ngx_open_file(filename->data, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0);
if (fd == NGX_INVALID_FILE) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
ngx_open_file_n " \"%s\" failed",
filename->data);
return NGX_CONF_ERROR;
}
// 保存之前的conf file
prev = cf->conf_file;
// 设置当前解析的conf file
cf->conf_file = &conf_file;
// 取文件相关的各种信息，例如大小
if (ngx_fd_info(fd, &cf->conf_file->file.info) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_EMERG, cf->log, ngx_errno,
ngx_fd_info_n " \"%s\" failed", filename->data);
}
cf->conf_file->buffer = &buf;
// 分配读取文件的缓冲区，不会全部读取进内存
buf.start = ngx_alloc(NGX_CONF_BUFFER, cf->log);
if (buf.start == NULL) {
goto failed;
}
buf.pos = buf.start;
buf.last = buf.start;
buf.end = buf.last + NGX_CONF_BUFFER;
buf.temporary = 1;
cf->conf_file->file.fd = fd;
cf->conf_file->file.name.len = filename->len;
cf->conf_file->file.name.data = filename->data;
cf->conf_file->file.offset = 0;
cf->conf_file->file.log = cf->log;
cf->conf_file->line = 1;
// 标记当前是解析文件
type = parse_file;
if (ngx_dump_config
#if (NGX_DEBUG)
|| 1
#endif
)
{
if (ngx_conf_add_dump(cf, filename) != NGX_OK) {
goto failed;
}
} else {
cf->conf_file->dump = NULL;
}
} else if (cf->conf_file->file.fd != NGX_INVALID_FILE) {
// 标记当前是解析配置块
type = parse_block;
} else {
// 解析-g传递的命令行参数
type = parse_param;
}
for ( ;; ) {
// 从配置文件里读取token,保存在cf->args数组里
rc = ngx_conf_read_token(cf);
/*
* ngx_conf_read_token() may return
*
* NGX_ERROR there is error
* NGX_OK the token terminated by ";" was found
* NGX_CONF_BLOCK_START the token terminated by "{" was found
* NGX_CONF_BLOCK_DONE the "}" was found
* NGX_CONF_FILE_DONE the configuration file is done
*/
if (rc == NGX_ERROR) {
goto done;
}
if (rc == NGX_CONF_BLOCK_DONE) {
if (type != parse_block) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "unexpected \"}\"");
goto failed;
}
goto done;
}
if (rc == NGX_CONF_FILE_DONE) {
if (type == parse_block) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected end of file, expecting \"}\"");
goto failed;
}
goto done;
}
if (rc == NGX_CONF_BLOCK_START) {
if (type == parse_param) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"block directives are not supported "
"in -g option");
goto failed;
}
}
/* rc == NGX_OK || rc == NGX_CONF_BLOCK_START */
// 特殊的解析处理函数，可以自己定义{}的解析处理，比较自由
// 例如 types {}、content_by_lua_block {}
if (cf->handler) {
/*
* the custom handler, i.e., that is used in the http's
* "types { ... }" directive
*/
if (rc == NGX_CONF_BLOCK_START) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "unexpected \"{\"");
goto failed;
}
rv = (*cf->handler)(cf, NULL, cf->handler_conf);
if (rv == NGX_CONF_OK) {
continue;
}
if (rv == NGX_CONF_ERROR) {
goto failed;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", rv);
goto failed;
}
// 在所有模块里查找匹配的指令，进行解析
rc = ngx_conf_handler(cf, rc);
if (rc == NGX_ERROR) {
goto failed;
}
}
failed:
rc = NGX_ERROR;
done:
if (filename) {
if (cf->conf_file->buffer->start) {
ngx_free(cf->conf_file->buffer->start);
}
if (ngx_close_file(fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno,
ngx_close_file_n " %s failed",
filename->data);
rc = NGX_ERROR;
}
// 恢复之前解析的文件，例如include指令
cf->conf_file = prev;
}
if (rc == NGX_ERROR) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
// 在所有模块里查找匹配的指令，进行解析
static ngx_int_t
ngx_conf_handler(ngx_conf_t *cf, ngx_int_t last)
{
char *rv;
void *conf, **confp;
ngx_uint_t i, found;
ngx_str_t *name;
ngx_command_t *cmd;
// 配置参数的首元素，即指令名字
name = cf->args->elts;
// 是否找到指令的标志
found = 0;
// 遍历所有模块
for (i = 0; cf->cycle->modules[i]; i++) {
// 取模块的指令数组
cmd = cf->cycle->modules[i]->commands;
// 节约时间，如果未定义指令数组则跳过
if (cmd == NULL) {
continue;
}
for ( /* void */ ; cmd->name.len; cmd++) {
// 先判断指令名的长度，速度快
if (name->len != cmd->name.len) {
continue;
}
// 再看字符串是否相同
if (ngx_strcmp(name->data, cmd->name.data) != 0) {
continue;
}
// 找到了一个匹配的指令
// 但因为会有重名，如http/server, upstream/server
// 需要根据指令的类型再做判断
found = 1;
// NGX_CONF_MODULE类型即conf模块，指令include可以出现在任何地方
// 其他的模块类型必须与当前解析的模块一致
// 例如：conf.module_type = NGX_CORE_MODULE;
if (cf->cycle->modules[i]->type != NGX_CONF_MODULE
&& cf->cycle->modules[i]->type != cf->module_type)
{
continue;
}
/* is the directive's location right ? */
// 检查指令的标志位，是否与当前解析环境的一致
// 使用的是位运算，检查某个bit
// 例如：conf.cmd_type = NGX_MAIN_CONF;
if (!(cmd->type & cf->cmd_type)) {
continue;
}
if (!(cmd->type & NGX_CONF_BLOCK) && last != NGX_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"directive \"%s\" is not terminated by \";\"",
name->data);
return NGX_ERROR;
}
if ((cmd->type & NGX_CONF_BLOCK) && last != NGX_CONF_BLOCK_START) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"directive \"%s\" has no opening \"{\"",
name->data);
return NGX_ERROR;
}
/* is the directive's argument count right ? */
// 检查指令的参数数量
// 如果不是NGX_CONF_ANY，那么就要检查
if (!(cmd->type & NGX_CONF_ANY)) {
// NGX_CONF_FLAG取值是on/off，加上指令名必须是2个
if (cmd->type & NGX_CONF_FLAG) {
if (cf->args->nelts != 2) {
goto invalid;
}
// NGX_CONF_1MORE,加上指令名必须大于1个
} else if (cmd->type & NGX_CONF_1MORE) {
if (cf->args->nelts < 2) {
goto invalid;
}
// NGX_CONF_1MORE,加上指令名必须大于2个
} else if (cmd->type & NGX_CONF_2MORE) {
if (cf->args->nelts < 3) {
goto invalid;
}
// 如果不是NGX_CONF_ANY，数量不能超过8个
} else if (cf->args->nelts > NGX_CONF_MAX_ARGS) {
goto invalid;
// 其他情况，使用关联数组检查标志位是否一致
} else if (!(cmd->type & argument_number[cf->args->nelts - 1]))
{
goto invalid;
}
}
/* set up the directive's configuration context */
// 指令的正确行检查完毕，现在要确定结构体的存储位置
conf = NULL;
// NGX_DIRECT_CONF，直接存储在cf->ctx数组里
// 这个通常是core模块
if (cmd->type & NGX_DIRECT_CONF) {
conf = ((void **) cf->ctx)[cf->cycle->modules[i]->index];
// NGX_MAIN_CONF，里面存储一个void**指针
// 例如核心模块http/stream
} else if (cmd->type & NGX_MAIN_CONF) {
conf = &(((void **) cf->ctx)[cf->cycle->modules[i]->index]);
// 大部分普通模块不会使用NGX_DIRECT_CONF、NGX_MAIN_CONF
} else if (cf->ctx) {
// 对于http/stream模块有意义，其他模块无用
// cf->ctx是有三个数组的结构体，用cmd->conf偏移量得到数组位置
confp = *(void **) ((char *) cf->ctx + cmd->conf);
if (confp) {
// 得到在main_conf/srv_conf/loc_conf数组里的模块对应配置结构体
// 注意使用的是ctx_index
conf = confp[cf->cycle->modules[i]->ctx_index];
}
}
// 调用指令数组里的函数解析，此时的conf指向正确的存储位置
// cf->args里存储的是指令参数，正确性已经验证过了
rv = cmd->set(cf, cmd, conf);
if (rv == NGX_CONF_OK) {
return NGX_OK;
}
if (rv == NGX_CONF_ERROR) {
return NGX_ERROR;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%s\" directive %s", name->data, rv);
return NGX_ERROR;
}
} // for结束，检查完所有模块
// 所有模块都没有找到指令，出错
if (found) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%s\" directive is not allowed here", name->data);
return NGX_ERROR;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unknown directive \"%s\"", name->data);
return NGX_ERROR;
invalid:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid number of arguments in \"%s\" directive",
name->data);
return NGX_ERROR;
}
static ngx_int_t
ngx_conf_read_token(ngx_conf_t *cf)
{
u_char *start, ch, *src, *dst;
off_t file_size;
size_t len;
ssize_t n, size;
ngx_uint_t found, need_space, last_space, sharp_comment, variable;
ngx_uint_t quoted, s_quoted, d_quoted, start_line;
ngx_str_t *word;
ngx_buf_t *b, *dump;
found = 0;
need_space = 0;
last_space = 1;
sharp_comment = 0;
variable = 0;
quoted = 0;
s_quoted = 0;
d_quoted = 0;
cf->args->nelts = 0;
b = cf->conf_file->buffer;
dump = cf->conf_file->dump;
start = b->pos;
start_line = cf->conf_file->line;
file_size = ngx_file_size(&cf->conf_file->file.info);
for ( ;; ) {
if (b->pos >= b->last) {
if (cf->conf_file->file.offset >= file_size) {
if (cf->args->nelts > 0 || !last_space) {
if (cf->conf_file->file.fd == NGX_INVALID_FILE) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected end of parameter, "
"expecting \";\"");
return NGX_ERROR;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected end of file, "
"expecting \";\" or \"}\"");
return NGX_ERROR;
}
return NGX_CONF_FILE_DONE;
}
len = b->pos - start;
if (len == NGX_CONF_BUFFER) {
cf->conf_file->line = start_line;
if (d_quoted) {
ch = '"';
} else if (s_quoted) {
ch = '\'';
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"too long parameter \"%*s...\" started",
10, start);
return NGX_ERROR;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"too long parameter, probably "
"missing terminating \"%c\" character", ch);
return NGX_ERROR;
}
if (len) {
ngx_memmove(b->start, start, len);
}
size = (ssize_t) (file_size - cf->conf_file->file.offset);
if (size > b->end - (b->start + len)) {
size = b->end - (b->start + len);
}
n = ngx_read_file(&cf->conf_file->file, b->start + len, size,
cf->conf_file->file.offset);
if (n == NGX_ERROR) {
return NGX_ERROR;
}
if (n != size) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
ngx_read_file_n " returned "
"only %z bytes instead of %z",
n, size);
return NGX_ERROR;
}
b->pos = b->start + len;
b->last = b->pos + n;
start = b->start;
if (dump) {
dump->last = ngx_cpymem(dump->last, b->pos, size);
}
}
ch = *b->pos++;
if (ch == LF) {
cf->conf_file->line++;
if (sharp_comment) {
sharp_comment = 0;
}
}
if (sharp_comment) {
continue;
}
if (quoted) {
quoted = 0;
continue;
}
if (need_space) {
if (ch == ' ' || ch == '\t' || ch == CR || ch == LF) {
last_space = 1;
need_space = 0;
continue;
}
if (ch == ';') {
return NGX_OK;
}
if (ch == '{') {
return NGX_CONF_BLOCK_START;
}
if (ch == ')') {
last_space = 1;
need_space = 0;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected \"%c\"", ch);
return NGX_ERROR;
}
}
if (last_space) {
start = b->pos - 1;
start_line = cf->conf_file->line;
if (ch == ' ' || ch == '\t' || ch == CR || ch == LF) {
continue;
}
switch (ch) {
case ';':
case '{':
if (cf->args->nelts == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected \"%c\"", ch);
return NGX_ERROR;
}
if (ch == '{') {
return NGX_CONF_BLOCK_START;
}
return NGX_OK;
case '}':
if (cf->args->nelts != 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected \"}\"");
return NGX_ERROR;
}
return NGX_CONF_BLOCK_DONE;
case '#':
sharp_comment = 1;
continue;
case '\\':
quoted = 1;
last_space = 0;
continue;
case '"':
start++;
d_quoted = 1;
last_space = 0;
continue;
case '\'':
start++;
s_quoted = 1;
last_space = 0;
continue;
case '$':
variable = 1;
last_space = 0;
continue;
default:
last_space = 0;
}
} else {
if (ch == '{' && variable) {
continue;
}
variable = 0;
if (ch == '\\') {
quoted = 1;
continue;
}
if (ch == '$') {
variable = 1;
continue;
}
if (d_quoted) {
if (ch == '"') {
d_quoted = 0;
need_space = 1;
found = 1;
}
} else if (s_quoted) {
if (ch == '\'') {
s_quoted = 0;
need_space = 1;
found = 1;
}
} else if (ch == ' ' || ch == '\t' || ch == CR || ch == LF
|| ch == ';' || ch == '{')
{
last_space = 1;
found = 1;
}
if (found) {
word = ngx_array_push(cf->args);
if (word == NULL) {
return NGX_ERROR;
}
word->data = ngx_pnalloc(cf->pool, b->pos - 1 - start + 1);
if (word->data == NULL) {
return NGX_ERROR;
}
for (dst = word->data, src = start, len = 0;
src < b->pos - 1;
len++)
{
if (*src == '\\') {
switch (src[1]) {
case '"':
case '\'':
case '\\':
src++;
break;
case 't':
*dst++ = '\t';
src += 2;
continue;
case 'r':
*dst++ = '\r';
src += 2;
continue;
case 'n':
*dst++ = '\n';
src += 2;
continue;
}
}
*dst++ = *src++;
}
*dst = '\0';
word->len = len;
if (ch == ';') {
return NGX_OK;
}
if (ch == '{') {
return NGX_CONF_BLOCK_START;
}
found = 0;
}
}
}
}
// 解析include指令，包含一个文件
char *
ngx_conf_include(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
char *rv;
ngx_int_t n;
ngx_str_t *value, file, name;
ngx_glob_t gl;
// 取指令参数数组
value = cf->args->elts;
// 第1个元素是包含的文件，可能使用通配符*
file = value[1];
ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
// 决定使用conf_prefix还是prefix得到完整文件名
// 如果不是以“\”开始的绝对路径，就加上前缀/usr/local/nginx/conf
if (ngx_conf_full_name(cf->cycle, &file, 1) != NGX_OK) {
return NGX_CONF_ERROR;
}
// 得到了include文件的绝对路径
// 如果文件不含有*?[等通配符，那么就是普通文件
// 调用ngx_conf_parse按普通文件解析
if (strpbrk((char *) file.data, "*?[") == NULL) {
ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
return ngx_conf_parse(cf, &file);
}
// 进行通配符查找文件
ngx_memzero(&gl, sizeof(ngx_glob_t));
gl.pattern = file.data;
gl.log = cf->log;
gl.test = 1;
if (ngx_open_glob(&gl) != NGX_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
ngx_open_glob_n " \"%s\" failed", file.data);
return NGX_CONF_ERROR;
}
rv = NGX_CONF_OK;
for ( ;; ) {
n = ngx_read_glob(&gl, &name);
if (n != NGX_OK) {
break;
}
file.len = name.len++;
file.data = ngx_pstrdup(cf->pool, &name);
if (file.data == NULL) {
return NGX_CONF_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
rv = ngx_conf_parse(cf, &file);
if (rv != NGX_CONF_OK) {
break;
}
}
ngx_close_glob(&gl);
return rv;
}
// 决定使用conf_prefix还是prefix得到完整文件名
// 如果不是以“/”开始的绝对路径，就加上前缀/usr/local/nginx/conf
ngx_int_t
ngx_conf_full_name(ngx_cycle_t *cycle, ngx_str_t *name, ngx_uint_t conf_prefix)
{
ngx_str_t *prefix;
prefix = conf_prefix ? &cycle->conf_prefix : &cycle->prefix;
return ngx_get_full_name(cycle->pool, prefix, name);
}
// 加入到cycle->open_files链表里
// 没有打开文件，之后在init_cycle里统一打开
ngx_open_file_t *
ngx_conf_open_file(ngx_cycle_t *cycle, ngx_str_t *name)
{
ngx_str_t full;
ngx_uint_t i;
ngx_list_part_t *part;
ngx_open_file_t *file;
#if (NGX_SUPPRESS_WARN)