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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "parse_ip.h"
struct ipstr *parse_ip(char *);
void add_parse_ip(struct ipstr **, char *);
char *ip_ntoa(u_long in);
/*
* Parse list of IP address or hostnames to scan (comma deliminated)
*
* Sanity checking is done on every case and should not return any invalid
* addresses.
*
* Valid data is:
*
* hostname anklebiter.secnet.com
* ipaddress 127.0.0.1
* ipaddress-ipaddress 127.0.0.1-127.0.0.20
* ipaddress-digit 127.0.0.1-20
* digit 10 (expands to 127.0.0.10);
* digit-digit 1-10 (expands to 127.0.0.1-127.0.0.10)
*
* For digit expansion, a CLASS C address must be present first somewhere,
* for expansion to work.
*
* A valid line would be:
*
* anklebiter, 127.0.0.1-3,11, 14-16, 17,127.0.0.20-127.0.0.21
*
* This would return
* anklebiters IP, 127.0.0.1, 127.0.0.2, 127.0.0.3, 127.0.0.11, 127.0.0.14,
* 127.0.0.15, 127.0.0.16, 127.0.0.17, 127.0.0.20, 127.0.0.21
*
* Oliver
*/
struct ipstr *parse_ip(input)
char *input;
{
char *one = NULL, *dup = NULL; /* a single specified address or range */
char *r1 = NULL, *r2 = NULL; /* for a range */
u_long ip1 = 0, ip2 = 0;
u_char start = 0, stop = 0;
struct hostent *hp = NULL;
int count = 0;
struct ipstr *ip = NULL;
char tmpip[20];
dup = strdup(input);
one = strtok(dup, ",");
while (one) {
while(isspace(*one) && *one)
one++;
/*
* If first char is not a digit, assume this is a hostname
*/
if (*one && !isdigit(*one)) {
hp = NULL;
hp = gethostbyname(one);
if (hp) {
memcpy((char *)&ip1, hp->h_addr, sizeof(ip1));
sprintf(tmpip, "%s", ip_ntoa(ip1));
add_parse_ip(&ip, tmpip);
count++;
} else {
/*
* Invalid data, can't resolve hostname, what is this?
*/
natprintf("[*]--- Unknown host: %s\n", one);
}
one = strtok(NULL, ",");
continue;
}
/*
* If '-' is in the string, assume it's a range
*/
if (*one && strstr(one, "-")) {
r1 = one;
for (r2 = one; *r2 && *r2 != '-'; r2++);
*r2 = '\0';
r2++;
/*
* A range specified as x.x.x.x-x.x.x.x
*/
if (r2 && *r2 && r1 && *r1 && strlen(r1) > 6) {
ip1 = inet_addr(r1);
ip2 = inet_addr(r2);
if (ip1 != -1 && ip2 != -1) {
start = (u_char)(ip1 >> 24);
stop = (u_char)(ip2 >> 24);
if (start <= stop && ip1 != -1 && ip2 != -1) {
while (start <= stop && start > 0) {
sprintf(tmpip, "%d.%d.%d.%d", (u_char)(ip1),
(u_char)(ip1 >> 8), (u_char)(ip1 >> 16), start);
add_parse_ip(&ip, tmpip);
count++;
start++;
}
}
}
} else {
/*
* A range specified as x-x (class C is prepended)
* Make sure ip1 contains the beginning of a sensible class C
*/
if ((u_char)(ip1) != 0 && r2 && *r2 && r1 && *r1) {
start = atoi(r1);
stop = atoi(r2);
if (start < stop) {
while(start <= stop && start > 0) {
sprintf(tmpip, "%d.%d.%d.%d", (u_char)(ip1),
(u_char)(ip1 >> 8), (u_char)(ip1 >> 16), start);
add_parse_ip(&ip, tmpip);
count++;
start++;
}
}
}
}
one = strtok(NULL, ",");
continue;
}
/*
* If we're here, it's a lonely IP address, check to see if it's valid
*/
if (*one && (ip2 = inet_addr(one)) != -1 && strlen(one) > 6) {
ip1 = ip2;
sprintf(tmpip, "%s", ip_ntoa(ip1));
add_parse_ip(&ip, tmpip);
count++;
} else {
if (!strstr(one, ".")) {
sprintf(tmpip, "%d.%d.%d.%d", (u_char)(ip1), (u_char)(ip1 >> 8),
(u_char)(ip1 >> 16), atoi(one));
add_parse_ip(&ip, tmpip);
count++;
}
}
one = strtok(NULL, ",");
}
return(ip);
}
/*
* Adds the specified IP to an array of IP address strings
*/
void add_parse_ip(ip, new)
struct ipstr **ip;
char *new;
{
struct ipstr *newitem, *tmp;
newitem = (struct ipstr *)malloc(sizeof(struct ipstr));
newitem->name = strdup(new);
newitem->next = NULL;
if (!*ip) {
*ip = newitem;
} else {
for (tmp = *ip; tmp->next; tmp = tmp->next);
tmp->next = newitem;
}
return;
}
char *ip_ntoa(in)
u_long in;
{
static char b[18];
register char *p;
p = (char *)∈
#define UC(b) (((int)b)&0xff)
(void)sprintf(b, "%d.%d.%d.%d", UC(p[0]), UC(p[1]), UC(p[2]), UC(p[3]));
return (b);
}
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