[incubator-brpc] branch master updated: fix: domain name length

[lorinlee]

This is an automated email from the ASF dual-hosted git repository.

lorinlee pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-brpc.git


The following commit(s) were added to refs/heads/master by this push:
     new 3a3f856e fix: domain name length
     new 01474e53 Merge pull request #1965 from wayslog/fix/hostname2endpoint
3a3f856e is described below

commit 3a3f856e22d4ae7df91c67011120e924e23bc6b2
Author: xuesong.zhao <xuesong.z...@shopee.com>
AuthorDate: Tue Oct 25 19:36:36 2022 +0800

    fix: domain name length
---
 src/butil/endpoint.cpp | 11 ++++++++---
 src/butil/endpoint.h   |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/butil/endpoint.cpp b/src/butil/endpoint.cpp
index 498f42e5..a696aa42 100644
--- a/src/butil/endpoint.cpp
+++ b/src/butil/endpoint.cpp
@@ -304,12 +304,17 @@ int str2endpoint(const char* ip_str, int port, EndPoint* 
point) {
 
 int hostname2endpoint(const char* str, EndPoint* point) {
     // Should be enough to hold ip address
-    char buf[64];
+    // The definitive descriptions of the rules for forming domain names 
appear in RFC 1035, RFC 1123, RFC 2181,
+    // and RFC 5892. The full domain name may not exceed the length of 253 
characters in its textual representation
+    // (Domain Names - Domain Concepts and Facilities. IETF. 
doi:10.17487/RFC1034. RFC 1034.).
+    // For cacheline optimize, use buf size as 256;
+    char buf[256];
     size_t i = 0;
-    for (; i < sizeof(buf) - 1 && str[i] != '\0' && str[i] != ':'; ++i) {
+    for (; i < MAX_DOMAIN_LENGTH && str[i] != '\0' && str[i] != ':'; ++i) {
         buf[i] = str[i];
     }
-    if (i == sizeof(buf) - 1) {
+
+    if (i >= MAX_DOMAIN_LENGTH || str[i] != ':') {
         return -1;
     }
 
diff --git a/src/butil/endpoint.h b/src/butil/endpoint.h
index 11831961..3b9cdf44 100644
--- a/src/butil/endpoint.h
+++ b/src/butil/endpoint.h
@@ -34,6 +34,7 @@ typedef struct in_addr ip_t;
 
 static const ip_t IP_ANY = { INADDR_ANY };
 static const ip_t IP_NONE = { INADDR_NONE };
+static const int MAX_DOMAIN_LENGTH = 253;
 
 // Convert |ip| to an integral
 inline in_addr_t ip2int(ip_t ip) { return ip.s_addr; }


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