【nginx读取配置文件http模块之server】
- 获取读到配置
- server模块
- 变量分析
- 流程分析
- listen
- server_name
继承上一篇文章【nginx读取配置文件http模块】 接下来来分析，http中的server，配置如下
可见监听的是当前本地的80端口。
然后我们就是读取配置，这个我们在【nginx流程分析之读取配置文件】说过，接下来看具体方法.
获取读到配置
因为调用ngx_conf_parse然后走到/nginx-1.14.2/src/core/ngx_conf_file.cngx_conf_handler方法，前面都一样，然后看一下这一段
if (cmd->type & NGX_DIRECT_CONF) {
//通过 ngx_core_module_create_conf 获取到的config
//在ngx_init_cycle中进行了初始化
//对应的结构体 ngx_core_conf_t
conf = ((void **) cf->ctx)[cf->cycle->modules[i]->index];
} else if (cmd->type & NGX_MAIN_CONF) {
conf = &(((void **) cf->ctx)[cf->cycle->modules[i]->index]);
} else if (cf->ctx) {
/*
cmd->conf 是因为子模块而出现
比如 http 下面有自己的变量 比如
include mime.types;
default_type application/octet-stream;
keepalive_timeout 65;
还有子模块比如server 和location
这三个模块都是在http的ctx下面，分别是main_conf srv_conf loc_conf
因为都会走这里为了区分用cmd->conf做指针偏移或者当前值，是srv_conf 还是 loc_conf
*/
confp = *(void **) ((char *) cf->ctx + cmd->conf);
/*
这里是因为 srv_conf loc_conf 针对每个模块都有不同的设置
因此这里在判断存在后 通过ctx_index获取每个模块特定的配置
*/
if (confp) {
conf = confp[cf->cycle->modules[i]->ctx_index];
}
}写到这里配合前面的分析，基本上是可以弄明白了，然后我们继续往下走。
server模块
首先在大模块上面仍然是ngx_http_core_module，然后找到对应的server命令，如图：
可见具体的方法是/nginx-1.14.2/src/http/ngx_http_core_module.c下面的ngx_http_core_server方法，
变量分析
因为这边大部分的变量在hhtp的模块中都已经说过了，因此这里我们主要说一下ngx_http_core_srv_conf_t这个
typedef struct {
/* array of the ngx_http_server_name_t, "server_name" directive */
ngx_array_t server_names;
/* server ctx */
ngx_http_conf_ctx_t *ctx;
ngx_str_t server_name;
size_t connection_pool_size;
size_t request_pool_size;
size_t client_header_buffer_size;
ngx_bufs_t large_client_header_buffers;
ngx_msec_t client_header_timeout;
ngx_flag_t ignore_invalid_headers;
ngx_flag_t merge_slashes;
ngx_flag_t underscores_in_headers;
unsigned listen:1;
#if (NGX_PCRE)
unsigned captures:1;
#endif
ngx_http_core_loc_conf_t **named_locations;
} ngx_http_core_srv_conf_t;这个变量前面都是正常的一些参数，主要看一下named_locations这个二级指针，主要是因为一个server下面会有多个ngx_http_core_loc_conf_t的变量。
流程分析
在/nginx-1.14.2/src/http/ngx_http_core_module.c中的ngx_http_core_server的方法，来看一下加上注释的分析
//注意这里的cf是从http那边赋值过来的
static char *
ngx_http_core_server(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
{
char *rv;
void *mconf;
ngx_uint_t i;
ngx_conf_t pcf;
ngx_http_module_t *module;
struct sockaddr_in *sin;
ngx_http_conf_ctx_t *ctx, *http_ctx;
ngx_http_listen_opt_t lsopt;
ngx_http_core_srv_conf_t *cscf, **cscfp;
ngx_http_core_main_conf_t *cmcf;
//初始化server自己的上下文
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
//临时存储http模块的上下文
http_ctx = cf->ctx;
//继承http模块的main_conf
ctx->main_conf = http_ctx->main_conf;
/* the server{}'s srv_conf */
//分配srv_conf
ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->srv_conf == NULL) {
return NGX_CONF_ERROR;
}
/* the server{}'s loc_conf */
//分配loc_conf
ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->loc_conf == NULL) {
return NGX_CONF_ERROR;
}
printf("ngx_http_core_server loc_conf:%p\n",ctx->loc_conf);
for (i = 0; cf->cycle->modules[i]; i++) {
if (cf->cycle->modules[i]->type != NGX_HTTP_MODULE) {
continue;
}
module = cf->cycle->modules[i]->ctx;
/*
初始化每个模块自己的srv_conf配置文件
*/
if (module->create_srv_conf) {
// printf("ngx_http_core_server name:%s\n",cf->cycle->modules[i]->name);
mconf = module->create_srv_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
//放到每个模块自己的srv_conf
ctx->srv_conf[cf->cycle->modules[i]->ctx_index] = mconf;
}
/*
初始化每个模块自己的loc_conf配置文件
*/
if (module->create_loc_conf) {
mconf = module->create_loc_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
//放到每个模块自己的loc_conf
ctx->loc_conf[cf->cycle->modules[i]->ctx_index] = mconf;
}
}
/* the server configuration context */
//读取http模块的srv_conf
cscf = ctx->srv_conf[ngx_http_core_module.ctx_index];
cscf->ctx = ctx;
//读取http模块的main_conf
cmcf = ctx->main_conf[ngx_http_core_module.ctx_index];
cscfp = ngx_array_push(&cmcf->servers);
if (cscfp == NULL) {
return NGX_CONF_ERROR;
}
//把srv_conf中的main_conf的servers替换成cscf
*cscfp = cscf;
/* parse inside server{} */
//存取cf到临时的pcf中
pcf = *cf;
cf->ctx = ctx;
cf->cmd_type = NGX_HTTP_SRV_CONF;
//继续读取剩下的配置
rv = ngx_conf_parse(cf, NULL);listen
这个主要模块仍然是ngx_http_core_module,然后是对应的方法是
然后看一下变量的解析这一块
typedef struct {
ngx_str_t url;
ngx_str_t host;
ngx_str_t port_text;
ngx_str_t uri;
in_port_t port;
in_port_t default_port;
int family;
unsigned listen:1;
unsigned uri_part:1;
unsigned no_resolve:1;
unsigned no_port:1;
unsigned wildcard:1;
socklen_t socklen;
ngx_sockaddr_t sockaddr;
ngx_addr_t *addrs;
ngx_uint_t naddrs;
char *err;
} ngx_url_t;
typedef struct {
struct sockaddr *sockaddr;
socklen_t socklen;
ngx_str_t name;
} ngx_addr_t;然后看一下主要的这个流程分析:
static char *
ngx_http_core_listen(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_core_srv_conf_t *cscf = conf;
ngx_str_t *value, size;
ngx_url_t u;
ngx_uint_t n;
ngx_http_listen_opt_t lsopt;
cscf->listen = 1;
//读取变量 listen和80
value = cf->args->elts;
ngx_memzero(&u, sizeof(ngx_url_t));
//value:listen u.url:80
u.url = value[1];
u.listen = 1;
u.default_port = 80;
/*
解析并且加载配置
因为我们这边只是简单的 listen 80
初始化
sockaddr
sin->sin_family = AF_INET;
u->family = AF_INET;
port
80
wildcard
1
port_text port
80
*/
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in \"%V\" of the \"listen\" directive",
u.err, &u.url);
}
return NGX_CONF_ERROR;
}
//初始化 lsopt
ngx_memzero(&lsopt, sizeof(ngx_http_listen_opt_t));
//复制u.sockaddr 到lsopt
ngx_memcpy(&lsopt.sockaddr.sockaddr, &u.sockaddr, u.socklen);
lsopt.socklen = u.socklen;
lsopt.backlog = NGX_LISTEN_BACKLOG;
lsopt.rcvbuf = -1;
lsopt.sndbuf = -1;
#if (NGX_HAVE_SETFIB)
lsopt.setfib = -1;
#endif
#if (NGX_HAVE_TCP_FASTOPEN)
lsopt.fastopen = -1;
#endif
lsopt.wildcard = u.wildcard;
#if (NGX_HAVE_INET6)
lsopt.ipv6only = 1;
#endif
/*
初始化 sockaddr 的 sin_addr
sockaddr 转义成 sockaddr_in
并且赋值为 0.0.0.0:80
*/
(void) ngx_sock_ntop(&lsopt.sockaddr.sockaddr, lsopt.socklen, lsopt.addr,
NGX_SOCKADDR_STRLEN, 1);
//判断其他参数 因为都没有用到可以忽略
for (n = 2; n < cf->args->nelts; n++) {
if (ngx_strcmp(value[n].data, "default_server") == 0
|| ngx_strcmp(value[n].data, "default") == 0)
{
printf("ngx_http_core_listen default_server\n");
lsopt.default_server = 1;
continue;
}
if (ngx_strcmp(value[n].data, "bind") == 0) {
lsopt.set = 1;
lsopt.bind = 1;
continue;
}
#if (NGX_HAVE_SETFIB)
if (ngx_strncmp(value[n].data, "setfib=", 7) == 0) {
lsopt.setfib = ngx_atoi(value[n].data + 7, value[n].len - 7);
lsopt.set = 1;
lsopt.bind = 1;
if (lsopt.setfib == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid setfib \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
continue;
}
#endif
#if (NGX_HAVE_TCP_FASTOPEN)
if (ngx_strncmp(value[n].data, "fastopen=", 9) == 0) {
lsopt.fastopen = ngx_atoi(value[n].data + 9, value[n].len - 9);
lsopt.set = 1;
lsopt.bind = 1;
if (lsopt.fastopen == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid fastopen \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
continue;
}
#endif
if (ngx_strncmp(value[n].data, "backlog=", 8) == 0) {
lsopt.backlog = ngx_atoi(value[n].data + 8, value[n].len - 8);
lsopt.set = 1;
lsopt.bind = 1;
if (lsopt.backlog == NGX_ERROR || lsopt.backlog == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid backlog \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[n].data, "rcvbuf=", 7) == 0) {
size.len = value[n].len - 7;
size.data = value[n].data + 7;
lsopt.rcvbuf = ngx_parse_size(&size);
lsopt.set = 1;
lsopt.bind = 1;
if (lsopt.rcvbuf == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid rcvbuf \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[n].data, "sndbuf=", 7) == 0) {
size.len = value[n].len - 7;
size.data = value[n].data + 7;
lsopt.sndbuf = ngx_parse_size(&size);
lsopt.set = 1;
lsopt.bind = 1;
if (lsopt.sndbuf == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid sndbuf \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[n].data, "accept_filter=", 14) == 0) {
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
lsopt.accept_filter = (char *) &value[n].data[14];
lsopt.set = 1;
lsopt.bind = 1;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"accept filters \"%V\" are not supported "
"on this platform, ignored",
&value[n]);
#endif
continue;
}
if (ngx_strcmp(value[n].data, "deferred") == 0) {
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
lsopt.deferred_accept = 1;
lsopt.set = 1;
lsopt.bind = 1;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the deferred accept is not supported "
"on this platform, ignored");
#endif
continue;
}
if (ngx_strncmp(value[n].data, "ipv6only=o", 10) == 0) {
#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
struct sockaddr *sa;
sa = &lsopt.sockaddr.sockaddr;
if (sa->sa_family == AF_INET6) {
if (ngx_strcmp(&value[n].data[10], "n") == 0) {
lsopt.ipv6only = 1;
} else if (ngx_strcmp(&value[n].data[10], "ff") == 0) {
lsopt.ipv6only = 0;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid ipv6only flags \"%s\"",
&value[n].data[9]);
return NGX_CONF_ERROR;
}
lsopt.set = 1;
lsopt.bind = 1;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"ipv6only is not supported "
"on addr \"%s\", ignored", lsopt.addr);
}
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"ipv6only is not supported "
"on this platform");
return NGX_CONF_ERROR;
#endif
}
if (ngx_strcmp(value[n].data, "reuseport") == 0) {
#if (NGX_HAVE_REUSEPORT)
lsopt.reuseport = 1;
lsopt.set = 1;
lsopt.bind = 1;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"reuseport is not supported "
"on this platform, ignored");
#endif
continue;
}
if (ngx_strcmp(value[n].data, "ssl") == 0) {
#if (NGX_HTTP_SSL)
lsopt.ssl = 1;
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the \"ssl\" parameter requires "
"ngx_http_ssl_module");
return NGX_CONF_ERROR;
#endif
}
if (ngx_strcmp(value[n].data, "http2") == 0) {
#if (NGX_HTTP_V2)
lsopt.http2 = 1;
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the \"http2\" parameter requires "
"ngx_http_v2_module");
return NGX_CONF_ERROR;
#endif
}
if (ngx_strcmp(value[n].data, "spdy") == 0) {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"invalid parameter \"spdy\": "
"ngx_http_spdy_module was superseded "
"by ngx_http_v2_module");
continue;
}
if (ngx_strncmp(value[n].data, "so_keepalive=", 13) == 0) {
if (ngx_strcmp(&value[n].data[13], "on") == 0) {
lsopt.so_keepalive = 1;
} else if (ngx_strcmp(&value[n].data[13], "off") == 0) {
lsopt.so_keepalive = 2;
} else {
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
u_char *p, *end;
ngx_str_t s;
end = value[n].data + value[n].len;
s.data = value[n].data + 13;
p = ngx_strlchr(s.data, end, ':');
if (p == NULL) {
p = end;
}
if (p > s.data) {
s.len = p - s.data;
lsopt.tcp_keepidle = ngx_parse_time(&s, 1);
if (lsopt.tcp_keepidle == (time_t) NGX_ERROR) {
goto invalid_so_keepalive;
}
}
s.data = (p < end) ? (p + 1) : end;
p = ngx_strlchr(s.data, end, ':');
if (p == NULL) {
p = end;
}
if (p > s.data) {
s.len = p - s.data;
lsopt.tcp_keepintvl = ngx_parse_time(&s, 1);
if (lsopt.tcp_keepintvl == (time_t) NGX_ERROR) {
goto invalid_so_keepalive;
}
}
s.data = (p < end) ? (p + 1) : end;
if (s.data < end) {
s.len = end - s.data;
lsopt.tcp_keepcnt = ngx_atoi(s.data, s.len);
if (lsopt.tcp_keepcnt == NGX_ERROR) {
goto invalid_so_keepalive;
}
}
if (lsopt.tcp_keepidle == 0 && lsopt.tcp_keepintvl == 0
&& lsopt.tcp_keepcnt == 0)
{
goto invalid_so_keepalive;
}
lsopt.so_keepalive = 1;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the \"so_keepalive\" parameter accepts "
"only \"on\" or \"off\" on this platform");
return NGX_CONF_ERROR;
#endif
}
lsopt.set = 1;
lsopt.bind = 1;
continue;
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
invalid_so_keepalive:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid so_keepalive value: \"%s\"",
&value[n].data[13]);
return NGX_CONF_ERROR;
#endif
}
if (ngx_strcmp(value[n].data, "proxy_protocol") == 0) {
lsopt.proxy_protocol = 1;
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
/*
从 main_conf的ports数组中得到一个成员
port设置成80
family设置成AF_INET
*/
if (ngx_http_add_listen(cf, cscf, &lsopt) == NGX_OK) {
return NGX_CONF_OK;
}
return NGX_CONF_ERROR;
}server_name
server_name对应的命令
然后看一下逻辑
static char *
ngx_http_core_server_name(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_core_srv_conf_t *cscf = conf;
u_char ch;
ngx_str_t *value;
ngx_uint_t i;
ngx_http_server_name_t *sn;
value = cf->args->elts;
for (i = 1; i < cf->args->nelts; i++) {
//127.0.0.1
ch = value[i].data[0];
// printf("ngx_http_core_server_name value[i].data:%s\n",value[i].data);
if ((ch == '*' && (value[i].len < 3 || value[i].data[1] != '.'))
|| (ch == '.' && value[i].len < 2))
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"server name \"%V\" is invalid", &value[i]);
return NGX_CONF_ERROR;
}
if (ngx_strchr(value[i].data, '/')) {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"server name \"%V\" has suspicious symbols",
&value[i]);
}
//获取service_name
sn = ngx_array_push(&cscf->server_names);
if (sn == NULL) {
return NGX_CONF_ERROR;
}
sn->server = cscf;
if (ngx_strcasecmp(value[i].data, (u_char *) "$hostname") == 0) {
sn->name = cf->cycle->hostname;
} else {
sn->name = value[i];
}
//127.0.0.1 走到这里
if (value[i].data[0] != '~') {
//取小写
ngx_strlow(sn->name.data, sn->name.data, sn->name.len);
continue;
}
}
return NGX_CONF_OK;
}接下来就是location的分析，这个我们单独开一篇文章,详见 【nginx读取配置文件http模块之location】
然后看一下解析万location后的操作，也就是ngx_config_parse后的操作，其实对于我们的配置其实一样的，因为是兼容操作，判断是否解析成功和监听套接字。
//rv == NGX_CONF_OK
//cscf->listen == 1
if (rv == NGX_CONF_OK && !cscf->listen) {
ngx_memzero(&lsopt, sizeof(ngx_http_listen_opt_t));
sin = &lsopt.sockaddr.sockaddr_in;
sin->sin_family = AF_INET;
#if (NGX_WIN32)
sin->sin_port = htons(80);
#else
sin->sin_port = htons((getuid() == 0) ? 80 : 8000);
#endif
sin->sin_addr.s_addr = INADDR_ANY;
lsopt.socklen = sizeof(struct sockaddr_in);
lsopt.backlog = NGX_LISTEN_BACKLOG;
lsopt.rcvbuf = -1;
lsopt.sndbuf = -1;
#if (NGX_HAVE_SETFIB)
lsopt.setfib = -1;
#endif
#if (NGX_HAVE_TCP_FASTOPEN)
lsopt.fastopen = -1;
#endif
lsopt.wildcard = 1;
(void) ngx_sock_ntop(&lsopt.sockaddr.sockaddr, lsopt.socklen,
lsopt.addr, NGX_SOCKADDR_STRLEN, 1);
if (ngx_http_add_listen(cf, cscf, &lsopt) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
return rv;
}
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