X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=net.c;h=61f50dd71041a2a5e80008dbb2da110b75b70a42;hp=f10afb71e31f0a1e7178972102b22c0feb01bfcc;hb=f113a41a633c0541f0d8418baf40205f4553c885;hpb=a9126f461792a84c760162ecb25100f1593d427d

diff --git a/net.c b/net.c
index f10afb71..61f50dd7 100644
--- a/net.c
+++ b/net.c
@@ -36,6 +36,47 @@
 #include "string.h"
 #include "fd.h"
 
+/**
+ * Parse and validate IPv4 address/netmask string.
+ *
+ * \param cidr	  Address in CIDR notation
+ * \param addr	  Copy of the IPv4 address part of \a cidr
+ * \param addrlen Size of \a addr in bytes
+ * \param netmask Value of the netmask part in \a cidr or the
+ *		  default of 32 if not specified.
+ *
+ * \return Pointer to \a addr if succesful, NULL on error.
+ * \sa RFC 4632
+ */
+char *parse_cidr(const char *cidr,
+		 char	 *addr, ssize_t addrlen,
+		 int32_t *netmask)
+{
+	const char *o = cidr;
+	char *c = addr, *end = c + (addrlen - 1);
+
+	*netmask = 0x20;
+
+	if (cidr == NULL || addrlen < 1)
+		goto failed;
+
+	for (o = cidr; (*c = *o == '/'? '\0' : *o); c++, o++)
+		if (c == end)
+			goto failed;
+
+	if (*o == '/')
+		if (para_atoi32(++o, netmask) < 0 ||
+		    *netmask < 0 || *netmask > 0x20)
+			goto failed;
+
+	if (is_valid_ipv4_address(addr))
+		return addr;
+failed:
+	*addr = '\0';
+	return NULL;
+}
+
+
 /**
  * Match string as a candidate IPv4 address.
  *
@@ -47,7 +88,8 @@ static bool is_v4_dot_quad(const char *address)
 	bool result;
 	regex_t r;
 
-	assert(!regcomp(&r, "^([0-9]+\\.){3}[0-9]+$", REG_EXTENDED|REG_NOSUB));
+	assert(para_regcomp(&r, "^([0-9]+\\.){3}[0-9]+$",
+		REG_EXTENDED | REG_NOSUB) >= 0);
 	result = regexec(&r, address, 0, NULL, 0) == 0;
 	regfree(&r);
 	return result;