diff options
Diffstat (limited to 'sql/hostname.cc')
| -rw-r--r-- | sql/hostname.cc | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/sql/hostname.cc b/sql/hostname.cc index 763c4647532..ee30d071602 100644 --- a/sql/hostname.cc +++ b/sql/hostname.cc @@ -367,6 +367,14 @@ bool ip_to_hostname(struct sockaddr_storage *ip_storage, err_code= vio_getnameinfo(ip, hostname_buffer, NI_MAXHOST, NULL, 0, NI_NAMEREQD); + /* BEGIN : DEBUG */ + DBUG_EXECUTE_IF("addr_fake_ipv4", + { + strcpy(hostname_buffer, "santa.claus.ipv4.example.com"); + err_code= 0; + };); + /* END : DEBUG */ + if (err_code) { // NOTE: gai_strerror() returns a string ending by a dot. @@ -439,6 +447,12 @@ bool ip_to_hostname(struct sockaddr_storage *ip_storage, DBUG_RETURN(err_status); } + /* + To avoid crashing the server in DBUG_EXECUTE_IF, + Define a variable which depicts state of addr_info_list. + */ + bool free_addr_info_list= false; + /* Get IP-addresses for the resolved host name (FCrDNS technique). */ struct addrinfo hints; @@ -453,6 +467,42 @@ bool ip_to_hostname(struct sockaddr_storage *ip_storage, (const char *) hostname_buffer)); err_code= getaddrinfo(hostname_buffer, NULL, &hints, &addr_info_list); + if (err_code == 0) + free_addr_info_list= true; + + /* BEGIN : DEBUG */ + DBUG_EXECUTE_IF("addr_fake_ipv4", + { + if (free_addr_info_list) + freeaddrinfo(addr_info_list); + + struct sockaddr_in *debug_addr; + static struct sockaddr_in debug_sock_addr[2]; + static struct addrinfo debug_addr_info[2]; + /* Simulating ipv4 192.0.2.5 */ + debug_addr= & debug_sock_addr[0]; + debug_addr->sin_family= AF_INET; + debug_addr->sin_addr.s_addr= inet_addr("192.0.2.5"); + + /* Simulating ipv4 192.0.2.4 */ + debug_addr= & debug_sock_addr[1]; + debug_addr->sin_family= AF_INET; + debug_addr->sin_addr.s_addr= inet_addr("192.0.2.4"); + + debug_addr_info[0].ai_addr= (struct sockaddr*) & debug_sock_addr[0]; + debug_addr_info[0].ai_addrlen= sizeof (struct sockaddr_in); + debug_addr_info[0].ai_next= & debug_addr_info[1]; + + debug_addr_info[1].ai_addr= (struct sockaddr*) & debug_sock_addr[1]; + debug_addr_info[1].ai_addrlen= sizeof (struct sockaddr_in); + debug_addr_info[1].ai_next= NULL; + + addr_info_list= & debug_addr_info[0]; + err_code= 0; + free_addr_info_list= false; + };); + + /* END : DEBUG */ if (err_code == EAI_NONAME) { @@ -505,7 +555,8 @@ bool ip_to_hostname(struct sockaddr_storage *ip_storage, { DBUG_PRINT("error", ("Out of memory.")); - freeaddrinfo(addr_info_list); + if (free_addr_info_list) + freeaddrinfo(addr_info_list); DBUG_RETURN(TRUE); } @@ -539,7 +590,8 @@ bool ip_to_hostname(struct sockaddr_storage *ip_storage, /* Free the result of getaddrinfo(). */ - freeaddrinfo(addr_info_list); + if (free_addr_info_list) + freeaddrinfo(addr_info_list); /* Add an entry for the IP to the cache. */ |