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nmap/nping/common_modified.cc

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/***************************************************************************
* common_modified.cc -- This file holds all those functions and classes *
* that have been reused from Nmap's code but that needed to be modified *
* in order to reuse them. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* Source is provided to this software because we believe users have a
* right to know exactly what a program is going to do before they run it.
* This also allows you to audit the software for security holes.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
#include "nping.h"
#include "common.h"
#include "common_modified.h"
#include "output.h"
#include "../libnetutil/netutil.h"
/*****************************************************************************
* STUFF FROM TargetGroup.cc
****************************************************************************
CHANGES:
Modified parse_expr.
Modified get_next_host:
*/
TargetGroup::TargetGroup() {
Initialize();
}
// Bring back (or start with) original state
void TargetGroup::Initialize() {
targets_type = TYPE_NONE;
memset(addresses, 0, sizeof(addresses));
memset(current, 0, sizeof(current));
memset(last, 0, sizeof(last));
ipsleft = 0;
}
/* take the object back to the beginning without (mdmcl)
* reinitializing the data structures */
int TargetGroup::rewind() {
/* For netmasks we must set the current address to the
* starting address and calculate the ips by distance */
if (targets_type == IPV4_NETMASK) {
currentaddr = startaddr;
if (startaddr.s_addr <= endaddr.s_addr) {
ipsleft = ((unsigned long long) (endaddr.s_addr - startaddr.s_addr)) + 1;
return 0;
}
else
assert(0);
}
/* For ranges, we easily set current to zero and calculate
* the ips by the number of values in the columns */
else if (targets_type == IPV4_RANGES) {
memset((char *)current, 0, sizeof(current));
ipsleft = (unsigned long long) (last[0] + 1) *
(unsigned long long) (last[1] + 1) *
(unsigned long long) (last[2] + 1) *
(unsigned long long) (last[3] + 1);
return 0;
}
#if HAVE_IPV6
/* For IPV6 there is only one address, this function doesn't
* make much sense for IPv6 does it? */
else if (targets_type == IPV6_ADDRESS) {
ipsleft = 1;
return 0;
}
#endif
/* If we got this far there must be an error, wrong type */
return -1;
}
/* For ranges, skip all hosts in an octet, (mdmcl)
* get_next_host should be used for skipping the last octet :-)
* returns: number of hosts skipped */
int TargetGroup::skip_range(_octet_nums octet) {
u32 hosts_skipped = 0, /* number of hosts skipped */
oct = 0; /* octect number */
int i = 0; /* simple lcv */
/* This function is only supported for RANGES! */
if (targets_type != IPV4_RANGES)
return -1;
switch (octet) {
case FIRST_OCTET:
oct = 0;
hosts_skipped = (u32)(last[1] + 1) * (last[2] + 1) * (last[3] + 1);
break;
case SECOND_OCTET:
oct = 1;
hosts_skipped = (u32)(last[2] + 1) * (last[3] + 1);
break;
case THIRD_OCTET:
oct = 2;
hosts_skipped = (last[3] + 1);
break;
default: /* Hmm, how did you do that? */
return -1;
}
/* catch if we try to take more than are left */
assert(ipsleft + 1>= hosts_skipped);
/* increment the next octect that we can above us */
for (i = oct; i >= 0; i--) {
if (current[i] < last[i]) {
current[i]++;
break;
}
else
current[i] = 0;
}
/* reset all the ones below us to zero */
for (i = oct+1; i <= 3; i++) {
current[i] = 0;
}
/* we actually don't skip the current, it was accounted for
* by get_next_host */
ipsleft -= hosts_skipped - 1;
return hosts_skipped;
}
/* Grab the next host from this expression (if any) and updates its internal
state to reflect that the IP was given out. Returns 0 and
fills in ss if successful. ss must point to a pre-allocated
sockaddr_storage structure */
int TargetGroup::get_next_host(struct sockaddr_storage *ss, size_t *sslen) {
int octet;
struct sockaddr_in *sin = (struct sockaddr_in *) ss;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ss;
/* CHANGE: Commented out. See note at the end of the method */
//startover: /* to handle nmap --resume where I have already
// * scanned many of the IPs */
assert(ss);
assert(sslen);
if (ipsleft == 0)
return -1;
if (targets_type == IPV4_NETMASK) {
memset(sin, 0, sizeof(struct sockaddr_in));
sin->sin_family = AF_INET;
*sslen = sizeof(struct sockaddr_in);
#if HAVE_SOCKADDR_SA_LEN
sin->sin_len = *sslen;
#endif
if (currentaddr.s_addr <= endaddr.s_addr) {
sin->sin_addr.s_addr = htonl(currentaddr.s_addr++);
} else {
error("Bogus target structure passed to %s", __func__);
ipsleft = 0;
return -1;
}
}
else if (targets_type == IPV4_RANGES) {
memset(sin, 0, sizeof(struct sockaddr_in));
sin->sin_family = AF_INET;
*sslen = sizeof(struct sockaddr_in);
#if HAVE_SOCKADDR_SA_LEN
sin->sin_len = *sslen;
#endif
//if (o.debugging > 2) { /* CHANGE: Do not use NmapOps and do not use log_Write*/
// log_write(LOG_STDOUT, "doing %d.%d.%d.%d = %d.%d.%d.%d\n", current[0], current[1], current[2], current[3], addresses[0][current[0]],addresses[1][current[1]],addresses[2][current[2]],addresses[3][current[3]]);
//}
//nping_print(DBG_2, "doing %d.%d.%d.%d = %d.%d.%d.%d", current[0], current[1], current[2], current[3], addresses[0][current[0]],addresses[1][current[1]],addresses[2][current[2]],addresses[3][current[3]]);
/* Set the IP to the current value of everything */
sin->sin_addr.s_addr = htonl(addresses[0][current[0]] << 24 |
addresses[1][current[1]] << 16 |
addresses[2][current[2]] << 8 |
addresses[3][current[3]]);
/* Now we nudge up to the next IP */
for(octet = 3; octet >= 0; octet--) {
if (current[octet] < last[octet]) {
/* OK, this is the column I have room to nudge upwards */
current[octet]++;
break;
} else {
/* This octet is finished so I reset it to the beginning */
current[octet] = 0;
}
}
if (octet == -1) {
/* It didn't find anything to bump up, I must have taken the last IP */
assert(ipsleft == 1);
/* So I set current to last with the very final octet up one ... */
/* Note that this may make current[3] == 256 */
current[0] = last[0]; current[1] = last[1];
current[2] = last[2]; current[3] = last[3] + 1;
} else {
assert(ipsleft > 1); /* There must be at least one more IP left */
}
} else {
assert(targets_type == IPV6_ADDRESS);
assert(ipsleft == 1);
#if HAVE_IPV6
*sslen = sizeof(struct sockaddr_in6);
memset(sin6, 0, *sslen);
sin6->sin6_family = AF_INET6;
#ifdef SIN_LEN
sin6->sin6_len = *sslen;
#endif /* SIN_LEN */
memcpy(sin6->sin6_addr.s6_addr, ip6.sin6_addr.s6_addr, 16);
sin6->sin6_scope_id = ip6.sin6_scope_id;
#else
fatal("IPV6 not supported on this platform");
#endif // HAVE_IPV6
}
ipsleft--;
/* CHANGE: These lines have been commented out to make this code
* independent from NmapOps */
/* If we are resuming from a previous scan, we have already finished
scans up to o.resume_ip. */
// if (sin->sin_family == AF_INET && o.resume_ip.s_addr) {
// if (o.resume_ip.s_addr == sin->sin_addr.s_addr)
// o.resume_ip.s_addr = 0; /* So that we will KEEP the next one */
// goto startover; /* Try again */
// }
return 0;
}
/* Returns the last given host, so that it will be given again next
time get_next_host is called. Obviously, you should only call
this if you have fetched at least 1 host since parse_expr() was
called */
int TargetGroup::return_last_host() {
int octet;
ipsleft++;
if (targets_type == IPV4_NETMASK) {
assert(currentaddr.s_addr > startaddr.s_addr);
currentaddr.s_addr--;
} else if (targets_type == IPV4_RANGES) {
for(octet = 3; octet >= 0; octet--) {
if (current[octet] > 0) {
/* OK, this is the column I have room to nudge downwards */
current[octet]--;
break;
} else {
/* This octet is already at the beginning, so I set it to the end */
current[octet] = last[octet];
}
}
assert(octet != -1);
} else {
assert(targets_type == IPV6_ADDRESS);
assert(ipsleft == 1);
}
return 0;
}
/* TODO: WARNING: This functions has been modified for portability. Check
* for label "CHANGE:" in the code to see the actual changes.
*
* UPDATE: Added support for DNS resolution caching. Using function
* gethostbynameCached() instead of gethostbyname()
*/
/* Initializes (or reinitializes) the object with a new expression, such
as 192.168.0.0/16 , 10.1.0-5.1-254 , or fe80::202:e3ff:fe14:1102 .
Returns 0 for success */
int TargetGroup::parse_expr(const char * const target_expr, int af) {
int i=0,j=0,k=0;
int start, end;
char *r,*s, *target_net;
char *addy[5];
char *hostexp = strdup(target_expr);
struct hostent *target;
namedhost = 0;
if (targets_type != TYPE_NONE)
Initialize();
ipsleft = 0;
if (af == AF_INET) {
if (strchr(hostexp, ':'))
fatal("Invalid host expression: %s -- colons only allowed in IPv6 addresses, and then you need the -6 switch", hostexp);
/*struct in_addr current_in;*/
addy[0] = addy[1] = addy[2] = addy[3] = addy[4] = NULL;
addy[0] = r = hostexp;
/* First we break the expression up into the four parts of the IP address
+ the optional '/mask' */
target_net = hostexp;
s = strchr(hostexp, '/'); /* Find the slash if there is one */
if (s) {
char *tail;
long netmask_long;
*s = '\0'; /* Make sure target_net is terminated before the /## */
s++; /* Point s at the netmask */
if (!isdigit(*s)) {
error("Illegal netmask value, must be /0 - /32 . Assuming /32 (one host)");
netmask = 32;
} else {
netmask_long = strtol(s, (char**) &tail, 10);
if (*tail != '\0' || tail == s || netmask_long < 0 || netmask_long > 32) {
error("Illegal netmask value, must be /0 - /32 . Assuming /32 (one host)");
netmask = 32;
} else
netmask = (u32) netmask_long;
}
} else
netmask = 32;
for(i=0; *(hostexp + i); i++)
if (isupper((int) *(hostexp +i)) || islower((int) *(hostexp +i))) {
namedhost = 1;
break;
}
if (netmask != 32 || namedhost) {
targets_type = IPV4_NETMASK;
if (!inet_pton(AF_INET, target_net, &(startaddr))) {
/* There is a bug report on the use of gethostbynameCached()
* <http://seclists.org/nmap-dev/2010/q1/803>
* I haven't been able to find any problem with that code but
* still, the fact that DNS queries are cached does not improve
* performance a lot. It may save one DNS query per execution
* in those cases where NpingOps::validateOptions() grabs the
* first target and uses it to determine output network interface.
* It would also save some queries in the case where a user
* specified the same host twice in the commandlined, something
* that does not make much sense anyway. However, since the call
* to gethostbynameCached() seems to cause denial of service
* for some people, I think it's ok to disable its use for now
* and enable it later if there is a good reason for it.
*
* Luis MartinGarcia. */
//if ((target = gethostbynameCached(target_net))) {
if ((target = gethostbyname(target_net))) {
int count=0;
memcpy(&(startaddr), target->h_addr_list[0], sizeof(struct in_addr));
while (target->h_addr_list[count]) count++;
if (count > 1)
nping_print(DBG_2,"Warning: Hostname %s resolves to %d IPs. Using %s.", target_net, count, inet_ntoa(*((struct in_addr *)target->h_addr_list[0])));
} else {
error("Failed to resolve given hostname/IP: %s. Note that you can't use '/mask' AND '1-4,7,100-' style IP ranges", target_net);
free(hostexp);
return 1;
}
}
if (netmask) {
unsigned long longtmp = ntohl(startaddr.s_addr);
startaddr.s_addr = longtmp & (unsigned long) (0 - (1<<(32 - netmask)));
endaddr.s_addr = longtmp | (unsigned long) ((1<<(32 - netmask)) - 1);
} else {
/* The above calculations don't work for a /0 netmask, though at first
* glance it appears that they would
*/
startaddr.s_addr = 0;
endaddr.s_addr = 0xffffffff;
}
currentaddr = startaddr;
if (startaddr.s_addr <= endaddr.s_addr) {
ipsleft = ((unsigned long long) (endaddr.s_addr - startaddr.s_addr)) + 1;
free(hostexp);
return 0;
}
fprintf(stderr, "Host specification invalid");
free(hostexp);
return 1;
}
else {
targets_type = IPV4_RANGES;
i=0;
while(*r) {
if (*r == '.' && ++i < 4) {
*r = '\0';
addy[i] = r + 1;
}
else if (*r != '*' && *r != ',' && *r != '-' && !isdigit((int)*r))
fatal("Invalid character in host specification. Note in particular that square brackets [] are no longer allowed. They were redundant and can simply be removed.");
r++;
}
if (i != 3) fatal("Invalid target host specification: %s", target_expr);
for(i=0; i < 4; i++) {
j=0;
do {
s = strchr(addy[i],',');
if (s) *s = '\0';
if (*addy[i] == '*') { start = 0; end = 255; }
else if (*addy[i] == '-') {
start = 0;
if (*(addy[i] + 1) == '\0') end = 255;
else end = atoi(addy[i]+ 1);
}
else {
start = end = atoi(addy[i]);
if ((r = strchr(addy[i],'-')) && *(r+1) ) end = atoi(r + 1);
else if (r && !*(r+1)) end = 255;
}
/* if (o.debugging > 2)
* log_write(LOG_STDOUT, "The first host is %d, and the last one is %d\n", start, end); */
if (start < 0 || start > end || start > 255 || end > 255)
fatal("Your host specifications are illegal!");
if (j + (end - start) > 255)
fatal("Your host specifications are illegal!");
for(k=start; k <= end; k++)
addresses[i][j++] = k;
last[i] = j-1;
if (s) addy[i] = s + 1;
} while (s);
}
}
memset((char *)current, 0, sizeof(current));
ipsleft = (unsigned long long) (last[0] + 1) *
(unsigned long long) (last[1] + 1) *
(unsigned long long) (last[2] + 1) *
(unsigned long long) (last[3] + 1);
}
else {
#if HAVE_IPV6
int rc = 0;
assert(af == AF_INET6);
if (strchr(hostexp, '/')) {
fatal("Invalid host expression: %s -- slash not allowed. IPv6 addresses can currently only be specified individually", hostexp);
}
targets_type = IPV6_ADDRESS;
struct addrinfo hints;
struct addrinfo *result = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
rc = getaddrinfo(hostexp, NULL, &hints, &result);
if (rc != 0 || result == NULL) {
error("Failed to resolve given IPv6 hostname/IP: %s. Note that you can't use '/mask' or '[1-4,7,100-]' style ranges for IPv6. Error code %d: %s", hostexp, rc, gai_strerror(rc));
free(hostexp);
if (result) freeaddrinfo(result);
return 1;
}
assert(result->ai_addrlen == sizeof(struct sockaddr_in6));
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) result->ai_addr;
memcpy(&ip6, sin6, sizeof(struct sockaddr_in6));
ipsleft = 1;
freeaddrinfo(result);
#else // HAVE_IPV6
fatal("IPv6 not supported on your platform");
#endif // HAVE_IPV6
}
free(hostexp);
return 0;
}
/*****************************************************************************/
/* getpts() and getpts_simple() (see above) are wrappers for this function */
void getpts_aux(const char *origexpr, int nested, u8 *porttbl, int *portwarning) {
long rangestart = -2343242, rangeend = -9324423;
const char *current_range;
char *endptr;
//char servmask[128]; // A protocol name can be up to 127 chars + nul byte
//int i;
/* An example of proper syntax to use in error messages. */
const char *syntax_example;
//if (change_range_type)
// syntax_example = "-100,200-1024,T:3000-4000,U:60000-";
//else
syntax_example = "-100,200-1024,3000-4000,60000-";
current_range = origexpr;
do {
while(isspace((int) *current_range))
current_range++; /* I don't know why I should allow spaces here, but I will */
//if (change_range_type) {
//if (*current_range == 'T' && *++current_range == ':') {
//current_range++;
//range_type = SCAN_TCP_PORT;
//continue;
//}
//if (*current_range == 'U' && *++current_range == ':') {
//current_range++;
//range_type = SCAN_UDP_PORT;
//continue;
//}
//if (*current_range == 'S' && *++current_range == ':') {
//current_range++;
//range_type = SCAN_SCTP_PORT;
//continue;
//}
//if (*current_range == 'P' && *++current_range == ':') {
//current_range++;
//range_type = SCAN_PROTOCOLS;
//continue;
//}
//}
if (*current_range == '[') {
if (nested)
fatal("Can't nest [] brackets in port/protocol specification");
//getpts_aux(++current_range, 1, porttbl, range_type, portwarning);
getpts_aux(++current_range, 1, porttbl, portwarning); // ADDED
// Skip past the ']'. This is OK because we can't nest []s
while(*current_range != ']') current_range++;
current_range++;
// Skip over a following ',' so we're ready to keep parsing
if (*current_range == ',') current_range++;
continue;
} else if (*current_range == ']') {
if (!nested)
fatal("Unexpected ] character in port/protocol specification");
return;
} else if (*current_range == '-') {
//if (range_type & SCAN_PROTOCOLS)
// rangestart = 0;
//else
rangestart = 1;
}
else if (isdigit((int) *current_range)) {
rangestart = strtol(current_range, &endptr, 10);
//if (range_type & SCAN_PROTOCOLS) {
// if (rangestart < 0 || rangestart > 255)
//fatal("Protocols to be scanned must be between 0 and 255 inclusive");
//} else {
if (rangestart < 0 || rangestart > 65535)
fatal("Ports to be scanned must be between 0 and 65535 inclusive");
//}
current_range = endptr;
while(isspace((int) *current_range)) current_range++;
} //else if (islower((int) *current_range) || *current_range == '*' || *current_range == '?') {
//i = 0;
//while (*current_range && !isspace((int)*current_range) && *current_range != ',' && *current_range != ']') {
// servmask[i++] = *(current_range++);
// if (i >= ((int)sizeof(servmask)-1))
// fatal("A service mask in the port/protocol specification is either malformed or too long");
// }
// if (*current_range && *current_range != ']') current_range++; // We want the '] character to be picked up on the next pass
// servmask[i] = '\0'; // Finish the string
//i = addportsfromservmask(servmask, porttbl, range_type);
//if (range_type & SCAN_PROTOCOLS) i += addprotocolsfromservmask(servmask, porttbl);
//if (i == 0)
// fatal("Found no matches for the service mask '%s' and your specified protocols", servmask);
//continue;
/*}*/ else {
fatal("Error #485: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example);
}
/* Now I have a rangestart, time to go after rangeend */
if (!*current_range || *current_range == ',' || *current_range == ']') {
/* Single port specification */
rangeend = rangestart;
} else if (*current_range == '-') {
current_range++;
if (!*current_range || *current_range == ',' || *current_range == ']') {
/* Ended with a -, meaning up until the last possible port */
//if (range_type & SCAN_PROTOCOLS)
// rangeend = 255;
//else
rangeend = 65535;
} else if (isdigit((int) *current_range)) {
rangeend = strtol(current_range, &endptr, 10);
// if (range_type & SCAN_PROTOCOLS) {
// if (rangeend < 0 || rangeend > 255)
// fatal("Protocols to be scanned must be between 0 and 255 inclusive");
// } else {
if (rangeend < 0 || rangeend > 65535)
fatal("Ports to be scanned must be between 0 and 65535 inclusive");
// }
current_range = endptr;
} else {
fatal("Error #486: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example);
}
if (rangeend < rangestart) {
//fatal("Your %s range %ld-%ld is backwards. Did you mean %ld-%ld?",
// (range_type & SCAN_PROTOCOLS) ? "protocol" : "port",
// rangestart, rangeend, rangeend, rangestart);
fatal("Your port range %ld-%ld is backwards. Did you mean %ld-%ld?",
rangestart, rangeend, rangeend, rangestart); // ADDED
}
} else {
fatal("Error #487: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example);
}
/* Now I have a rangestart and a rangeend, so I can add these ports */
while(rangestart <= rangeend) {
if (porttbl[rangestart]) {
if (!(*portwarning)) {
error("WARNING: Duplicate port number(s) specified. Are you alert enough to be using Nping? Have some coffee or grab a RedBull(tm).");
(*portwarning)++;
}
} else {
//if (nested) {
//if ((range_type & SCAN_TCP_PORT) &&
//nmap_getservbyport(rangestart, "tcp")) {
//porttbl[rangestart] |= SCAN_TCP_PORT;
//}
//if ((range_type & SCAN_UDP_PORT) &&
//nmap_getservbyport(rangestart, "udp")) {
//porttbl[rangestart] |= SCAN_UDP_PORT;
//}
//if ((range_type & SCAN_SCTP_PORT) &&
//nmap_getservbyport(rangestart, "sctp")) {
//porttbl[rangestart] |= SCAN_SCTP_PORT;
//}
//if ((range_type & SCAN_PROTOCOLS) &&
//nmap_getprotbynum(rangestart)) {
//porttbl[rangestart] |= SCAN_PROTOCOLS;
//}
//} else {
//porttbl[rangestart] |= range_type;
//}
porttbl[rangestart]=1; // ADDED for NPING
}
rangestart++;
}
/* Find the next range */
while(isspace((int) *current_range)) current_range++;
if (*current_range == ']') {
if (!nested) fatal("Unexpected ] character in port specification");
return;
}
if (*current_range && *current_range != ',') {
fatal("Error #488: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example);
}
if (*current_range == ',')
current_range++;
} while(current_range && *current_range);
}
/*****************************************************************************/
/* For systems without SCTP in netinet/in.h, such as MacOS X */
#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP 132
#endif
/* IPv6 compatible version of Nmap's devname2ipaddr()
* @warning For this to work we need getinterfaces() not to skip IPv6 */
int devname2ipaddr_alt(char *dev, struct sockaddr_storage *addr) {
struct interface_info *mydevs;
struct sockaddr_storage *s=NULL;
struct sockaddr_in *s4=NULL;
struct sockaddr_in6 *s6=NULL;
int numdevs;
int i;
mydevs = getinterfaces(&numdevs, NULL, 0);
if (!mydevs) return -1;
if( !addr || !dev )
fatal("devname2ipaddr(): NULL values supplied.");
for(i=0; i < numdevs; i++) {
s=(struct sockaddr_storage *)&mydevs[i].addr;
s4=(struct sockaddr_in *)&mydevs[i].addr;
s6=(struct sockaddr_in6 *)&mydevs[i].addr;
if (s4->sin_family==AF_INET || s6->sin6_family==AF_INET6){
if (!strcmp(dev, mydevs[i].devfullname)) {
memcpy(addr, s, sizeof(struct sockaddr_storage));
return 0;
}
} else{ /* Unknown family, skipping it... */
continue;
}
}
return -1;
} /* End of devname2ipaddr() */
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