netdev - Re: [PATCH v3] ss: Enclose IPv6 address in brackets

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Date:   Tue, 1 Aug 2017 18:07:57 +0200
From:   Florian Lehner <dev@...-flo.net>
To:     Phil Sutter <phil@....cc>, netdev@...r.kernel.org
Subject: Re: [PATCH v3] ss: Enclose IPv6 address in brackets



On 08/01/2017 04:11 PM, Phil Sutter wrote:
> On Tue, Aug 01, 2017 at 12:05:13PM +0200, Florian Lehner wrote:
> [...]
>> @@ -114,9 +114,13 @@ int addr64_n2a(__u64 addr, char *buff, size_t len);
>>  int af_bit_len(int af);
>>  int af_byte_len(int af);
>>
>> -const char *format_host_r(int af, int len, const void *addr,
>> -			       char *buf, int buflen);
>> -const char *format_host(int af, int lne, const void *addr);
>> +const char *format_host_rb(int af, int len, const void *addr,
>> +			       char *buf, int buflen, bool *resolved);
>> +#define format_host_r(af, len, addr, buf, buflen) \
>> +	format_host_rb(af, len, addr, buf, buflen, NULL)
>> +const char *format_host_b(int af, int lne, const void *addr, bool
>> *resolved);
>> +#define format_host(af, lne, addr) \
>> +	format_host_b(af, lne, addr, NULL)
>>  #define format_host_rta(af, rta) \
>>  	format_host(af, RTA_PAYLOAD(rta), RTA_DATA(rta))
>>  const char *rt_addr_n2a_r(int af, int len, const void *addr,
>> diff --git a/lib/utils.c b/lib/utils.c
>> index 9aa3219..42c3bf5 100644
>> --- a/lib/utils.c
>> +++ b/lib/utils.c
>> @@ -898,8 +898,8 @@ static const char *resolve_address(const void *addr,
>> int len, int af)
>>  }
>>  #endif
>>
>> -const char *format_host_r(int af, int len, const void *addr,
>> -			char *buf, int buflen)
>> +const char *format_host_rb(int af, int len, const void *addr,
>> +			char *buf, int buflen, bool *resolved)
>>  {
>>  #ifdef RESOLVE_HOSTNAMES
>>  	if (resolve_hosts) {
>> @@ -909,17 +909,20 @@ const char *format_host_r(int af, int len, const
>> void *addr,
>>
>>  		if (len > 0 &&
>>  		    (n = resolve_address(addr, len, af)) != NULL)
>> +		{
>> +			*resolved = true;
>>  			return n;
>> +		}
>>  	}
>>  #endif
>>  	return rt_addr_n2a_r(af, len, addr, buf, buflen);
>>  }
> 
> Did you test that? I guess calling format_host() will lead to
> dereference of a NULL pointer.

Yes, I did. And it just worked.
David Laight suggested to use strchr(). Instead of changing stuff in
lib/* I will try this.