RepoMirrors/musl
1
0
Fork 0
mirror of git://git.musl-libc.org/musl synced 2024-12-16 03:35:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

add support for reverse port lookups from services file to getnameinfo

Browse Source 
this also affects the legacy getservbyport family, which uses
getnameinfo as its backend.
This commit is contained in:
Rich Felker 2014-06-04 19:33:20 -04:00
parent 01dc3f4fea
commit fde3c29de4
1 changed files with 35 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
src/network/getnameinfo.c
View File

@ -45,13 +45,13 @@ static void mkptr6(char *s, const unsigned char *ip)
strcpy(s, "ip6.arpa");
}
static char *reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, int family)
static void reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, int family)
{
char line[512], *p, *z;
unsigned char _buf[1032], atmp[16];
struct address iplit;
FILE _f, *f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf);
if (!f) return 0;
if (!f) return;
if (family == AF_INET) {
memcpy(atmp+12, a, 4);
memcpy(atmp, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
@ -83,7 +83,32 @@ static char *reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid,
}
}
__fclose_ca(f);
return 0;
}
static void reverse_services(char *buf, int port, int dgram)
{
unsigned long svport;
char line[128], *p, *z;
unsigned char _buf[1032];
FILE _f, *f = __fopen_rb_ca("/etc/services", &_f, _buf, sizeof _buf);
if (!f) return;
while (fgets(line, sizeof line, f)) {
if ((p=strchr(line, '#'))) *p++='\n', *p=0;
for (p=line; *p && !isspace(*p); p++);
if (!p) continue;
*p++ = 0;
svport = strtoul(p, &z, 10);
if (svport != port || z==p) continue;
if (dgram && strncmp(z, "/udp", 4)) continue;
if (!dgram && strncmp(z, "/tcp", 4)) continue;
if (p-line > 32) continue;
memcpy(buf, line, p-line);
break;
}
__fclose_ca(f);
}
static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet)
@ -162,7 +187,13 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
}
if (serv && servlen) {
char *p = itoa(num, ntohs(((struct sockaddr_in *)sa)->sin_port));
char *p = buf;
int port = ntohs(((struct sockaddr_in *)sa)->sin_port);
buf[0] = 0;
if (!(flags & NI_NUMERICSERV))
reverse_services(buf, port, flags & NI_DGRAM);
if (!*p)
p = itoa(num, port);
if (strlen(p) >= servlen)
return EAI_OVERFLOW;
strcpy(serv, p);