Add better IP, netmask and gateway checks.
- IP addresses are verified as being correct dotted quad format. - Netmasks are verified as being in correct dotted quad or 0x* format, and being consecutive 1 bits followed by consecutive 0 bits. - The gateway is verified as being correct dotted quad format and being reachable through the configured IP address and netmask.
This commit is contained in:
Eivind Eklund
parent
88544700ca
commit
44084c9348
@ -116,18 +116,36 @@ feepout(char *msg)
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msgConfirm(msg);
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}
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/* Very basic IP address integrity check - could be drastically improved */
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/* Verify IP address integrity */
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static int
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verifyIP(char *ip)
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verifyIP(char *ip, unsigned long *out)
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{
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int a, b, c, d;
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long a, b, c, d;
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char *endptr;
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if (ip && sscanf(ip, "%d.%d.%d.%d", &a, &b, &c, &d) == 4 &&
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_validByte(a) && _validByte(b) && _validByte(c) &&
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_validByte(d) && (d != 255))
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return 1;
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else
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if (ip == NULL)
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return 0;
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a = strtol(ip, &endptr, 10);
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if (*endptr++ != '.')
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return 0;
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b = strtol(endptr, &endptr, 10);
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if (*endptr++ != '.')
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return 0;
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c = strtol(endptr, &endptr, 10);
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if (*endptr++ != '.')
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return 0;
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d = strtol(endptr, &endptr, 10);
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if (*endptr != '\0')
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return 0;
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/* Both 0 and 255 are technically valid in nets that are larger
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than class C, but at least MS' TCP/IP stacks freak out if they see
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them. */
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if (!_validByte(a) || !_validByte(b) || !_validByte(c) ||
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!_validByte(d) || (d == 0) || (d == 255))
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return 0;
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if (out)
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*out = (a << 24) | (b << 16) | (c << 8) | d;
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return 1;
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}
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static int
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@ -146,21 +164,81 @@ verifyIP6(char *ip)
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return 0;
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}
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/* Verify IPv4 netmask as being well-formed as
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a 0x or AAA.BBB.CCC.DDD mask */
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static int
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verifyNetmask(const char *netmask, unsigned long *out)
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{
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unsigned long mask;
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unsigned long tmp;
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char *endptr;
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if (netmask[0] == '0' && (netmask[1] == 'x' || netmask[1] == 'X')) {
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/* Parse out hex mask */
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mask = strtoul(netmask, &endptr, 0);
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if (*endptr != '\0')
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return 0;
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} else {
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/* Parse out quad decimal mask */
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mask = strtoul(netmask, &endptr, 10);
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if (!_validByte(mask) || *endptr++ != '.')
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return 0;
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tmp = strtoul(endptr, &endptr, 10);
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if (!_validByte(tmp) || *endptr++ != '.')
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return 0;
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mask = (mask << 8) + tmp;
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tmp = strtoul(endptr, &endptr, 10);
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if (!_validByte(tmp) || *endptr++ != '.')
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return 0;
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mask = (mask << 8) + tmp;
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tmp = strtoul(endptr, &endptr, 10);
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if (!_validByte(tmp) || *endptr++ != '\0')
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return 0;
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mask = (mask << 8) + tmp;
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}
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/* Verify that we have a continous netmask */
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if ((((-mask & mask) - 1) | mask) != 0xffffffff)
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return 0;
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if (out)
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*out = mask;
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return 1;
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}
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static int
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verifyGW(char *gw, unsigned long *ip, unsigned long *mask)
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{
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unsigned long parsedgw;
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if (!verifyIP(gw, &parsedgw))
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return 0;
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/* Gateway needs to be within the set of IPs reachable through the
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interface */
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if (ip && mask && ((parsedgw & *mask) != (*ip & *mask)))
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return 0;
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return 1;
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}
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/* Check for the settings on the screen - the per-interface stuff is
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moved to the main handling code now to do it on the fly - sigh */
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static int
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verifySettings(void)
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{
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unsigned long parsedip;
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unsigned long parsednetmask;
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if (!hostname[0])
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feepout("Must specify a host name of some sort!");
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else if (gateway[0] && strcmp(gateway, "NO") && !verifyIP(gateway))
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feepout("Invalid gateway IPv4 address specified");
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else if (nameserver[0] && !verifyIP(nameserver) && !verifyIP6(nameserver))
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else if (nameserver[0] && !verifyIP(nameserver, NULL) &&
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!verifyIP6(nameserver))
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feepout("Invalid name server IP address specified");
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else if (netmask[0] && (netmask[0] < '0' && netmask[0] > '3'))
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feepout("Invalid netmask value");
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else if (ipaddr[0] && !verifyIP(ipaddr))
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else if (ipaddr[0] && !verifyIP(ipaddr, &parsedip))
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feepout("Invalid IPv4 address");
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else if (netmask[0] && !verifyNetmask(netmask, &parsednetmask))
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feepout("Invalid netmask value");
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else if (gateway[0] && strcmp(gateway, "NO") &&
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!verifyGW(gateway, ipaddr[0] ? &parsedip : NULL,
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netmask[0] ? &parsednetmask : NULL))
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feepout("Invalid gateway IPv4 address specified");
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else
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return 1;
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return 0;
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@ -116,18 +116,36 @@ feepout(char *msg)
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msgConfirm(msg);
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}
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/* Very basic IP address integrity check - could be drastically improved */
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/* Verify IP address integrity */
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static int
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verifyIP(char *ip)
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verifyIP(char *ip, unsigned long *out)
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{
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int a, b, c, d;
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long a, b, c, d;
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char *endptr;
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if (ip && sscanf(ip, "%d.%d.%d.%d", &a, &b, &c, &d) == 4 &&
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_validByte(a) && _validByte(b) && _validByte(c) &&
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_validByte(d) && (d != 255))
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return 1;
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else
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if (ip == NULL)
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return 0;
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a = strtol(ip, &endptr, 10);
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if (*endptr++ != '.')
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return 0;
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b = strtol(endptr, &endptr, 10);
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if (*endptr++ != '.')
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return 0;
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c = strtol(endptr, &endptr, 10);
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if (*endptr++ != '.')
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return 0;
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d = strtol(endptr, &endptr, 10);
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if (*endptr != '\0')
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return 0;
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/* Both 0 and 255 are technically valid in nets that are larger
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than class C, but at least MS' TCP/IP stacks freak out if they see
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them. */
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if (!_validByte(a) || !_validByte(b) || !_validByte(c) ||
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!_validByte(d) || (d == 0) || (d == 255))
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return 0;
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if (out)
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*out = (a << 24) | (b << 16) | (c << 8) | d;
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return 1;
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}
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static int
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@ -146,21 +164,81 @@ verifyIP6(char *ip)
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return 0;
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}
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/* Verify IPv4 netmask as being well-formed as
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a 0x or AAA.BBB.CCC.DDD mask */
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static int
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verifyNetmask(const char *netmask, unsigned long *out)
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{
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unsigned long mask;
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unsigned long tmp;
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char *endptr;
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if (netmask[0] == '0' && (netmask[1] == 'x' || netmask[1] == 'X')) {
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/* Parse out hex mask */
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mask = strtoul(netmask, &endptr, 0);
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if (*endptr != '\0')
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return 0;
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} else {
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/* Parse out quad decimal mask */
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mask = strtoul(netmask, &endptr, 10);
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if (!_validByte(mask) || *endptr++ != '.')
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return 0;
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tmp = strtoul(endptr, &endptr, 10);
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if (!_validByte(tmp) || *endptr++ != '.')
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return 0;
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mask = (mask << 8) + tmp;
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tmp = strtoul(endptr, &endptr, 10);
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if (!_validByte(tmp) || *endptr++ != '.')
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return 0;
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mask = (mask << 8) + tmp;
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tmp = strtoul(endptr, &endptr, 10);
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if (!_validByte(tmp) || *endptr++ != '\0')
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return 0;
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mask = (mask << 8) + tmp;
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}
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/* Verify that we have a continous netmask */
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if ((((-mask & mask) - 1) | mask) != 0xffffffff)
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return 0;
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if (out)
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*out = mask;
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return 1;
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}
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static int
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verifyGW(char *gw, unsigned long *ip, unsigned long *mask)
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{
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unsigned long parsedgw;
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if (!verifyIP(gw, &parsedgw))
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return 0;
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/* Gateway needs to be within the set of IPs reachable through the
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interface */
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if (ip && mask && ((parsedgw & *mask) != (*ip & *mask)))
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return 0;
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return 1;
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}
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/* Check for the settings on the screen - the per-interface stuff is
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moved to the main handling code now to do it on the fly - sigh */
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static int
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verifySettings(void)
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{
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unsigned long parsedip;
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unsigned long parsednetmask;
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if (!hostname[0])
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feepout("Must specify a host name of some sort!");
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else if (gateway[0] && strcmp(gateway, "NO") && !verifyIP(gateway))
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feepout("Invalid gateway IPv4 address specified");
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else if (nameserver[0] && !verifyIP(nameserver) && !verifyIP6(nameserver))
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else if (nameserver[0] && !verifyIP(nameserver, NULL) &&
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!verifyIP6(nameserver))
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feepout("Invalid name server IP address specified");
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else if (netmask[0] && (netmask[0] < '0' && netmask[0] > '3'))
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feepout("Invalid netmask value");
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else if (ipaddr[0] && !verifyIP(ipaddr))
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else if (ipaddr[0] && !verifyIP(ipaddr, &parsedip))
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feepout("Invalid IPv4 address");
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else if (netmask[0] && !verifyNetmask(netmask, &parsednetmask))
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feepout("Invalid netmask value");
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else if (gateway[0] && strcmp(gateway, "NO") &&
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!verifyGW(gateway, ipaddr[0] ? &parsedip : NULL,
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netmask[0] ? &parsednetmask : NULL))
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feepout("Invalid gateway IPv4 address specified");
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else
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return 1;
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return 0;
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