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src/core/ngx_syslog.c - nginx-1.7.10
Global variables defined
Functions defined
Macros defined
Source code
- #include <ngx_config.h>
- #include <ngx_core.h>
- #include <ngx_event.h>
- #define NGX_SYSLOG_MAX_STR \
- NGX_MAX_ERROR_STR + sizeof("<255>Jan 01 00:00:00 ") - 1 \
- + (NGX_MAXHOSTNAMELEN - 1) + 1 \
- + 32 + 2
- static char *ngx_syslog_parse_args(ngx_conf_t *cf, ngx_syslog_peer_t *peer);
- static ngx_int_t ngx_syslog_init_peer(ngx_syslog_peer_t *peer);
- static void ngx_syslog_cleanup(void *data);
- static char *facilities[] = {
- "kern", "user", "mail", "daemon", "auth", "intern", "lpr", "news", "uucp",
- "clock", "authpriv", "ftp", "ntp", "audit", "alert", "cron", "local0",
- "local1", "local2", "local3", "local4", "local5", "local6", "local7",
- NULL
- };
- static char *severities[] = {
- "emerg", "alert", "crit", "error", "warn", "notice", "info", "debug", NULL
- };
- static ngx_log_t ngx_syslog_dummy_log;
- static ngx_event_t ngx_syslog_dummy_event;
- char *
- ngx_syslog_process_conf(ngx_conf_t *cf, ngx_syslog_peer_t *peer)
- {
- peer->pool = cf->pool;
- peer->facility = NGX_CONF_UNSET_UINT;
- peer->severity = NGX_CONF_UNSET_UINT;
- if (ngx_syslog_parse_args(cf, peer) != NGX_CONF_OK) {
- return NGX_CONF_ERROR;
- }
- if (peer->server.sockaddr == NULL) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "no syslog server specified");
- return NGX_CONF_ERROR;
- }
- if (peer->facility == NGX_CONF_UNSET_UINT) {
- peer->facility = 23;
- }
- if (peer->severity == NGX_CONF_UNSET_UINT) {
- peer->severity = 6;
- }
- if (peer->tag.data == NULL) {
- ngx_str_set(&peer->tag, "nginx");
- }
- peer->conn.fd = (ngx_socket_t) -1;
- return NGX_CONF_OK;
- }
- static char *
- ngx_syslog_parse_args(ngx_conf_t *cf, ngx_syslog_peer_t *peer)
- {
- u_char *p, *comma, c;
- size_t len;
- ngx_str_t *value;
- ngx_url_t u;
- ngx_uint_t i;
- value = cf->args->elts;
- p = value[1].data + sizeof("syslog:") - 1;
- for ( ;; ) {
- comma = (u_char *) ngx_strchr(p, ',');
- if (comma != NULL) {
- len = comma - p;
- *comma = '\0';
- } else {
- len = value[1].data + value[1].len - p;
- }
- if (ngx_strncmp(p, "server=", 7) == 0) {
- if (peer->server.sockaddr != NULL) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "duplicate syslog \"server\"");
- return NGX_CONF_ERROR;
- }
- ngx_memzero(&u, sizeof(ngx_url_t));
- u.url.data = p + 7;
- u.url.len = len - 7;
- u.default_port = 514;
- if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
- if (u.err) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "%s in syslog server \"%V\"",
- u.err, &u.url);
- }
- return NGX_CONF_ERROR;
- }
- peer->server = u.addrs[0];
- } else if (ngx_strncmp(p, "facility=", 9) == 0) {
- if (peer->facility != NGX_CONF_UNSET_UINT) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "duplicate syslog \"facility\"");
- return NGX_CONF_ERROR;
- }
- for (i = 0; facilities[i] != NULL; i++) {
- if (ngx_strcmp(p + 9, facilities[i]) == 0) {
- peer->facility = i;
- goto next;
- }
- }
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "unknown syslog facility \"%s\"", p + 9);
- return NGX_CONF_ERROR;
- } else if (ngx_strncmp(p, "severity=", 9) == 0) {
- if (peer->severity != NGX_CONF_UNSET_UINT) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "duplicate syslog \"severity\"");
- return NGX_CONF_ERROR;
- }
- for (i = 0; severities[i] != NULL; i++) {
- if (ngx_strcmp(p + 9, severities[i]) == 0) {
- peer->severity = i;
- goto next;
- }
- }
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "unknown syslog severity \"%s\"", p + 9);
- return NGX_CONF_ERROR;
- } else if (ngx_strncmp(p, "tag=", 4) == 0) {
- if (peer->tag.data != NULL) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "duplicate syslog \"tag\"");
- return NGX_CONF_ERROR;
- }
-
- if (len - 4 > 32) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "syslog tag length exceeds 32");
- return NGX_CONF_ERROR;
- }
- for (i = 4; i < len; i++) {
- c = ngx_tolower(p[i]);
- if (c < '0' || (c > '9' && c < 'a' && c != '_') || c > 'z') {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "syslog \"tag\" only allows "
- "alphanumeric characters "
- "and underscore");
- return NGX_CONF_ERROR;
- }
- }
- peer->tag.data = p + 4;
- peer->tag.len = len - 4;
- } else {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
- "unknown syslog parameter \"%s\"", p);
- return NGX_CONF_ERROR;
- }
- next:
- if (comma == NULL) {
- break;
- }
- p = comma + 1;
- }
- return NGX_CONF_OK;
- }
- u_char *
- ngx_syslog_add_header(ngx_syslog_peer_t *peer, u_char *buf)
- {
- ngx_uint_t pri;
- pri = peer->facility * 8 + peer->severity;
- return ngx_sprintf(buf, "<%ui>%V %V %V: ", pri, &ngx_cached_syslog_time,
- &ngx_cycle->hostname, &peer->tag);
- }
- void
- ngx_syslog_writer(ngx_log_t *log, ngx_uint_t level, u_char *buf,
- size_t len)
- {
- u_char *p, msg[NGX_SYSLOG_MAX_STR];
- ngx_uint_t head_len;
- ngx_syslog_peer_t *peer;
- peer = log->wdata;
- if (peer->busy) {
- return;
- }
- peer->busy = 1;
- peer->severity = level - 1;
- p = ngx_syslog_add_header(peer, msg);
- head_len = p - msg;
- len -= NGX_LINEFEED_SIZE;
- if (len > NGX_SYSLOG_MAX_STR - head_len) {
- len = NGX_SYSLOG_MAX_STR - head_len;
- }
- p = ngx_snprintf(p, len, "%s", buf);
- (void) ngx_syslog_send(peer, msg, p - msg);
- peer->busy = 0;
- }
- ssize_t
- ngx_syslog_send(ngx_syslog_peer_t *peer, u_char *buf, size_t len)
- {
- ssize_t n;
- if (peer->conn.fd == (ngx_socket_t) -1) {
- if (ngx_syslog_init_peer(peer) != NGX_OK) {
- return NGX_ERROR;
- }
- }
-
- peer->conn.log = ngx_cycle->log;
- if (ngx_send) {
- n = ngx_send(&peer->conn, buf, len);
- } else {
-
- n = ngx_os_io.send(&peer->conn, buf, len);
- }
- #if (NGX_HAVE_UNIX_DOMAIN)
- if (n == NGX_ERROR && peer->server.sockaddr->sa_family == AF_UNIX) {
- if (ngx_close_socket(peer->conn.fd) == -1) {
- ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
- ngx_close_socket_n " failed");
- }
- peer->conn.fd = (ngx_socket_t) -1;
- }
- #endif
- return n;
- }
- static ngx_int_t
- ngx_syslog_init_peer(ngx_syslog_peer_t *peer)
- {
- ngx_socket_t fd;
- ngx_pool_cleanup_t *cln;
- peer->conn.read = &ngx_syslog_dummy_event;
- peer->conn.write = &ngx_syslog_dummy_event;
- ngx_syslog_dummy_event.log = &ngx_syslog_dummy_log;
- fd = ngx_socket(peer->server.sockaddr->sa_family, SOCK_DGRAM, 0);
- if (fd == (ngx_socket_t) -1) {
- ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
- ngx_socket_n " failed");
- return NGX_ERROR;
- }
- if (ngx_nonblocking(fd) == -1) {
- ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
- ngx_nonblocking_n " failed");
- goto failed;
- }
- if (connect(fd, peer->server.sockaddr, peer->server.socklen) == -1) {
- ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
- "connect() failed");
- goto failed;
- }
- cln = ngx_pool_cleanup_add(peer->pool, 0);
- if (cln == NULL) {
- goto failed;
- }
- cln->data = peer;
- cln->handler = ngx_syslog_cleanup;
- peer->conn.fd = fd;
-
- peer->conn.write->ready = 1;
- return NGX_OK;
- failed:
- if (ngx_close_socket(fd) == -1) {
- ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
- ngx_close_socket_n " failed");
- }
- return NGX_ERROR;
- }
- static void
- ngx_syslog_cleanup(void *data)
- {
- ngx_syslog_peer_t *peer = data;
-
- peer->busy = 1;
- if (peer->conn.fd == (ngx_socket_t) -1) {
- return;
- }
- if (ngx_close_socket(peer->conn.fd) == -1) {
- ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
- ngx_close_socket_n " failed");
- }
- }
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