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-rw-r--r--libntp/decodenetnum.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/libntp/decodenetnum.c b/libntp/decodenetnum.c
new file mode 100644
index 0000000..187d5ca
--- /dev/null
+++ b/libntp/decodenetnum.c
@@ -0,0 +1,83 @@
+/*
+ * decodenetnum - return a net number (this is crude, but careful)
+ */
+#include <config.h>
+#include <sys/types.h>
+#include <ctype.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#include "ntp.h"
+#include "ntp_stdlib.h"
+#include "ntp_assert.h"
+
+/*
+ * decodenetnum convert text IP address and port to sockaddr_u
+ *
+ * Returns 0 for failure, 1 for success.
+ */
+int
+decodenetnum(
+ const char *num,
+ sockaddr_u *netnum
+ )
+{
+ struct addrinfo hints, *ai = NULL;
+ int err;
+ u_short port;
+ const char *cp;
+ const char *port_str;
+ char *pp;
+ char *np;
+ char name[80];
+
+ NTP_REQUIRE(num != NULL);
+ NTP_REQUIRE(strlen(num) < sizeof(name));
+
+ port_str = NULL;
+ if ('[' != num[0]) {
+ /*
+ * to distinguish IPv6 embedded colons from a port
+ * specification on an IPv4 address, assume all
+ * legal IPv6 addresses have at least two colons.
+ */
+ pp = strchr(num, ':');
+ if (NULL == pp)
+ cp = num; /* no colons */
+ else if (NULL != strchr(pp + 1, ':'))
+ cp = num; /* two or more colons */
+ else { /* one colon */
+ strlcpy(name, num, sizeof(name));
+ cp = name;
+ pp = strchr(cp, ':');
+ *pp = '\0';
+ port_str = pp + 1;
+ }
+ } else {
+ cp = num + 1;
+ np = name;
+ while (*cp && ']' != *cp)
+ *np++ = *cp++;
+ *np = 0;
+ if (']' == cp[0] && ':' == cp[1] && '\0' != cp[2])
+ port_str = &cp[2];
+ cp = name;
+ }
+ ZERO(hints);
+ hints.ai_flags = Z_AI_NUMERICHOST;
+ err = getaddrinfo(cp, "ntp", &hints, &ai);
+ if (err != 0)
+ return 0;
+ NTP_INSIST(ai->ai_addrlen <= sizeof(*netnum));
+ ZERO(*netnum);
+ memcpy(netnum, ai->ai_addr, ai->ai_addrlen);
+ freeaddrinfo(ai);
+ if (NULL == port_str || 1 != sscanf(port_str, "%hu", &port))
+ port = NTP_PORT;
+ SET_PORT(netnum, port);
+ return 1;
+}