>Darren Reed writes:
>> As part of this continuing code review, I looked at
>> http://cr.opensolaris.org/~tonyn/firewall13Jan2009/usr/src/cmd/svc/servinfo/servinfo.c
>>
>> and I'm wondering if you have, in your latest workspace, a version
>> of uaddr2port() that doesn't leak memory from the malloc() for port_str?
>> The other alternative is to use alloca() instead.
>
>I doubt that either malloc or alloca is needed here. strtol should be
>able to crack those numbers without having to make a separate copy.
What is the code doing?
79 if ((dot = strrchr(addr, '.')) == 0) {
80 return (0);
81 } else {
82 char *p = dot - 1;
83 size_t l = 0;
84 while (*p != '.') {
85 p--;
86 l++;
87 }
88 p++;
89
90 bzero(port_str, addr_len);
91 (void) strncpy(port_str, p, l);
92 port = atol(port_str) << 8;
93
94 (void) strlcpy(port_str, dot + 1, addr_len);
95 port = port | atol(port_str);
96 }
97
98 return (port);
And are we sure that the code is only called with an address with 2 dots?
I agree that strtol is probably the best function to use here.
p = addr + strlen(addr);
dots = 0;
while (p-- > addr)
if (*p == '.' && ++dots == 2)
break;
if (dots != 2)
return (0);
p++;
port = strtoul(p, &q, 10) << 8;
if (q == p || q != '.')
return (0);
port |= strtoul(q + 1, NULL, 10);
return (port);
Casper
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