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264 lines
7.6 KiB
C
264 lines
7.6 KiB
C
3 years ago
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diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
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index cd55520c..dade1846 100644
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--- a/src/core/ngx_resolver.c
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+++ b/src/core/ngx_resolver.c
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@@ -9,12 +9,26 @@
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#include <ngx_core.h>
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#include <ngx_event.h>
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+#if !(NGX_WIN32)
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+#include <resolv.h>
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+#endif
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+
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#define NGX_RESOLVER_UDP_SIZE 4096
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#define NGX_RESOLVER_TCP_RSIZE (2 + 65535)
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#define NGX_RESOLVER_TCP_WSIZE 8192
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+#if !(NGX_WIN32)
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+/*
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+ * note that 2KB should be more than enough for majority of the
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+ * resolv.conf files out there. it also acts as a safety guard to prevent
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+ * abuse.
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+ */
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+#define NGX_RESOLVER_FILE_BUF_SIZE 2048
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+#define NGX_RESOLVER_FILE_NAME "/etc/resolv.conf"
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+#endif
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+
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typedef struct {
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u_char ident_hi;
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@@ -131,6 +145,191 @@ static ngx_resolver_node_t *ngx_resolver_lookup_addr6(ngx_resolver_t *r,
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#endif
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+#if !(NGX_WIN32)
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+static ngx_int_t
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+ngx_resolver_read_resolv_conf(ngx_conf_t *cf, ngx_resolver_t *r, u_char *path,
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+ size_t path_len)
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+{
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+ ngx_url_t u;
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+ ngx_resolver_connection_t *rec;
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+ ngx_fd_t fd;
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+ ngx_file_t file;
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+ u_char buf[NGX_RESOLVER_FILE_BUF_SIZE];
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+ u_char ipv6_buf[NGX_INET6_ADDRSTRLEN];
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+ ngx_uint_t address = 0, j, total = 0;
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+ ssize_t n, i;
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+ enum {
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+ sw_nameserver,
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+ sw_spaces,
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+ sw_address,
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+ sw_skip
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+ } state;
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+
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+ file.name.data = path;
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+ file.name.len = path_len;
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+
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+ if (ngx_conf_full_name(cf->cycle, &file.name, 1) != NGX_OK) {
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+ return NGX_ERROR;
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+ }
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+
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+ fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY,
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+ NGX_FILE_OPEN, 0);
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+
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+ if (fd == NGX_INVALID_FILE) {
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+ ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
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+ ngx_open_file_n " \"%s\" failed", file.name.data);
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+
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+ return NGX_ERROR;
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+ }
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+
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+ ngx_memzero(&file, sizeof(ngx_file_t));
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+
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+ file.fd = fd;
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+ file.log = cf->log;
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+
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+ state = sw_nameserver;
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+
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+ n = ngx_read_file(&file, buf, NGX_RESOLVER_FILE_BUF_SIZE, 0);
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+
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+ if (n == NGX_ERROR) {
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+ ngx_conf_log_error(NGX_LOG_ALERT, cf, ngx_errno,
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+ ngx_read_file_n " \"%s\" failed", file.name.data);
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+ }
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+
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+ if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
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+ ngx_conf_log_error(NGX_LOG_ALERT, cf, ngx_errno,
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+ ngx_close_file_n " \"%s\" failed", file.name.data);
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+ }
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+
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+ if (n == NGX_ERROR) {
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+ return NGX_ERROR;
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+ }
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+
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+ if (n == 0) {
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+ return NGX_OK;
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+ }
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+
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+ for (i = 0; i < n && total < MAXNS; /* void */) {
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+ if (buf[i] == '#' || buf[i] == ';') {
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+ state = sw_skip;
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+ }
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+
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+ switch (state) {
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+
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+ case sw_nameserver:
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+
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+ if ((size_t) n - i >= sizeof("nameserver") - 1
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+ && ngx_memcmp(buf + i, "nameserver",
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+ sizeof("nameserver") - 1) == 0)
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+ {
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+ state = sw_spaces;
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+ i += sizeof("nameserver") - 1;
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+
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+ continue;
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+ }
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+
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+ break;
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+
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+ case sw_spaces:
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+ if (buf[i] != '\t' && buf[i] != ' ') {
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+ address = i;
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+ state = sw_address;
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+ }
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+
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+ break;
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+
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+ case sw_address:
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+
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+ if (buf[i] == CR || buf[i] == LF || i == n - 1) {
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+ ngx_memzero(&u, sizeof(ngx_url_t));
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+
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+ u.url.data = buf + address;
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+
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+ if (i == n - 1 && buf[i] != CR && buf[i] != LF) {
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+ u.url.len = n - address;
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+
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+ } else {
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+ u.url.len = i - address;
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+ }
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+
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+ u.default_port = 53;
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+
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+ /* IPv6? */
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+ if (ngx_strlchr(u.url.data, u.url.data + u.url.len,
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+ ':') != NULL)
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+ {
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+ if (u.url.len + 2 > sizeof(ipv6_buf)) {
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+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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+ "IPv6 resolver address is too long:"
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+ " \"%V\"", &u.url);
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+
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+ return NGX_ERROR;
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+ }
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+
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+ ipv6_buf[0] = '[';
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+ ngx_memcpy(ipv6_buf + 1, u.url.data, u.url.len);
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+ ipv6_buf[u.url.len + 1] = ']';
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+
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+ u.url.data = ipv6_buf;
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+ u.url.len = u.url.len + 2;
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+ }
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+
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+ if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
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+ if (u.err) {
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+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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+ "%s in resolver \"%V\"",
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+ u.err, &u.url);
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+ }
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+
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+ return NGX_ERROR;
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+ }
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+
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+ rec = ngx_array_push_n(&r->connections, u.naddrs);
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+ if (rec == NULL) {
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+ return NGX_ERROR;
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+ }
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+
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+ ngx_memzero(rec, u.naddrs * sizeof(ngx_resolver_connection_t));
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+
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+ for (j = 0; j < u.naddrs; j++) {
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+ rec[j].sockaddr = u.addrs[j].sockaddr;
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+ rec[j].socklen = u.addrs[j].socklen;
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+ rec[j].server = u.addrs[j].name;
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+ rec[j].resolver = r;
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+ }
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+
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+ total++;
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+
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+#if (NGX_DEBUG)
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+ /*
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+ * logs with level below NGX_LOG_NOTICE will not be printed
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+ * in this early phase
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+ */
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+ ngx_conf_log_error(NGX_LOG_NOTICE, cf, 0,
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+ "parsed a resolver: \"%V\"", &u.url);
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+#endif
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+
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+ state = sw_nameserver;
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+ }
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+
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+ break;
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+
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+ case sw_skip:
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+ if (buf[i] == CR || buf[i] == LF) {
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+ state = sw_nameserver;
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+ }
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+
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+ break;
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+ }
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+
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+ i++;
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+ }
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+
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+ return NGX_OK;
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+}
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+#endif
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+
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+
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ngx_resolver_t *
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ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
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{
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@@ -246,6 +445,39 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
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}
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#endif
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+#if !(NGX_WIN32)
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+ if (ngx_strncmp(names[i].data, "local=", 6) == 0) {
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+
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+ if (ngx_strcmp(&names[i].data[6], "on") == 0) {
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+ if (ngx_resolver_read_resolv_conf(cf, r,
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+ (u_char *)
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+ NGX_RESOLVER_FILE_NAME,
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+ sizeof(NGX_RESOLVER_FILE_NAME)
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+ - 1)
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+ != NGX_OK)
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+ {
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+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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+ "unable to parse local resolver");
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+ return NULL;
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+ }
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+
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+ } else if (ngx_strcmp(&names[i].data[6], "off") != 0) {
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+ if (ngx_resolver_read_resolv_conf(cf, r,
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+ &names[i].data[6],
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+ names[i].len - 6)
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+ != NGX_OK)
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+ {
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+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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+ "unable to parse local resolver");
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+ return NULL;
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+ }
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+
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+ }
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+
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+ continue;
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+ }
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+#endif
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+
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ngx_memzero(&u, sizeof(ngx_url_t));
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u.url = names[i];
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