DNSServiceErrorType DNSSD_API DNSServiceConstructFullName
(
char *const fullName,
const char *const service, // May be NULL
const char *const regtype,
const char *const domain
)
{
const int len = !regtype ? 0 : mDNSPlatformStrLen(regtype) - DomainEndsInDot(regtype);
char *fn = fullName;
char *const lim = fullName + 1005;
const char *s = service;
const char *r = regtype;
const char *d = domain;
// regtype must be at least "x._udp" or "x._tcp"
if (len < 6 || !domain || !domain[0]) return kDNSServiceErr_BadParam;
if (!strCaseEqual((regtype + len - 4), "_tcp", 4) && !strCaseEqual((regtype + len - 4), "_udp", 4))
return kDNSServiceErr_BadParam;
if (service && *service)
{
while (*s)
{
unsigned char c = *s++; // Needs to be unsigned, or values like 0xFF will be interpreted as < 32
if (c <= ' ') // Escape non-printable characters
{
if (fn+4 >= lim) goto fail;
*fn++ = '\\';
*fn++ = '0' + (c / 100);
*fn++ = '0' + (c / 10) % 10;
c = '0' + (c ) % 10;
}
else if (c == '.' || (c == '\\')) // Escape dot and backslash literals
{
if (fn+2 >= lim) goto fail;
*fn++ = '\\';
}
else
if (fn+1 >= lim) goto fail;
*fn++ = (char)c;
}
*fn++ = '.';
}
while (*r) if (fn+1 >= lim) goto fail; else *fn++ = *r++;
if (!DomainEndsInDot(regtype)) { if (fn+1 >= lim) goto fail; else *fn++ = '.'; }
while (*d) if (fn+1 >= lim) goto fail; else *fn++ = *d++;
if (!DomainEndsInDot(domain)) { if (fn+1 >= lim) goto fail; else *fn++ = '.'; }
*fn = '\0';
return kDNSServiceErr_NoError;
fail:
*fn = '\0';
return kDNSServiceErr_BadParam;
}
int DNSSD_API DNSServiceConstructFullName
(
char *fullName,
const char *service, /* may be NULL */
const char *regtype,
const char *domain
)
{
unsigned long len;
unsigned char c;
char *fn = fullName;
const char *s = service;
const char *r = regtype;
const char *d = domain;
if (service)
{
while(*s)
{
c = (unsigned char)*s++;
if (c == '.' || (c == '\\')) *fn++ = '\\'; // escape dot and backslash literals
else if (c <= ' ') // escape non-printable characters
{
*fn++ = '\\';
*fn++ = (char) ('0' + (c / 100));
*fn++ = (char) ('0' + (c / 10) % 10);
c = (unsigned char)('0' + (c % 10));
}
*fn++ = (char)c;
}
*fn++ = '.';
}
if (!regtype) return -1;
len = (unsigned long) strlen(regtype);
if (DomainEndsInDot(regtype)) len--;
if (len < 6) return -1; // regtype must be at least "x._udp" or "x._tcp"
if (strncmp((regtype + len - 4), "_tcp", 4) && strncmp((regtype + len - 4), "_udp", 4)) return -1;
while(*r) *fn++ = *r++;
if (!DomainEndsInDot(regtype)) *fn++ = '.';
if (!domain || !domain[0]) return -1;
while(*d) *fn++ = *d++;
if (!DomainEndsInDot(domain)) *fn++ = '.';
*fn = '\0';
return 0;
}
