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-g option (generate): exclude network and broadcast address for cidr ranges (idea by Eric Brander)

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pull/5/merge
David Schweikert 13 years ago
parent 65cfc7bc89
commit 95d1200994
2 changed files with 150 additions and 122 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
UNRELEASED
David Schweikert <david@schweikert.ch>
- Revision v3.1 ALPHA
* -g option (generate): exclude network and broadcast address for cidr
ranges (idea by Eric Brander)
Thu Dec 28 2011
David Schweikert <david@schweikert.ch>
- Revision v3.0

266
fping.c
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@ -383,6 +383,8 @@ char *sprint_tm( int t );
void ev_enqueue(HOST_ENTRY *h);
HOST_ENTRY *ev_dequeue();
void ev_remove(HOST_ENTRY *h);
void add_cidr(char *);
void add_range(char *, char *);
#endif /* _NO_PROTO */
@ -753,7 +755,7 @@ int main( int argc, char **argv )
if( ( ping_data_size > MAX_PING_DATA ) || ( ping_data_size < MIN_PING_DATA ) )
{
fprintf( stderr, "%s: data size %u not valid, must be between %lu and %u\n",
fprintf( stderr, "%s: data size %u not valid, must be between %u and %u\n",
prog, ping_data_size, MIN_PING_DATA, MAX_PING_DATA );
usage();
@ -860,6 +862,7 @@ int main( int argc, char **argv )
/* if the generate_flag is on, then generate the IP list */
argv = &argv[optind];
argc -= optind;
/* cover allowable conditions */
@ -912,128 +915,22 @@ int main( int argc, char **argv )
}/* WHILE */
fclose( ping_file );
}/* ELSE IF */
else if( *argv && generate_flag )
{
char* pStart;
char* pEnd;
char* pCopy;
char* pTemp;
struct in_addr sStart;
struct in_addr sEnd;
int iBits;
int iBitpos;
int iMask = 1;
int failed = 0;
/* two possible forms are allowed here */
pStart = *argv;
argv++;
/* IP mask is specified */
if( !*argv )
{
pCopy = ( char* )malloc( sizeof( char ) * strlen( pStart ) + 1 );
if( pCopy )
{
/* make a copy of the arg, so we don't damage the original */
strcpy( pCopy, pStart );
/* look for token '/' */
if( strtok( pCopy, "/" ) != NULL )
{
/* if no token was found, the string should be unaltered */
if( strcmp( pCopy, pStart ) != 0 )
{
/* convert it to the starting address */
if( inet_addr( pCopy ) != INADDR_NONE )
{
sStart.s_addr = inet_addr( pCopy );
/* now find the bitmask */
pTemp = ( char* )pStart + strlen( pCopy ) + 1;
/* get the bits */
iBits = 32 - atoi( pTemp );
if( ( iBits < 32 ) && ( iBits >= 0 ) )
{
/* now make the end address */
for( iBitpos = 0; iBitpos < iBits; iBitpos++ )
iMask = iMask | 1 << iBitpos;
sEnd.s_addr = sStart.s_addr | ntohl( iMask );
}/* IF */
else
failed = 1;
}/* IF */
else
failed = 1;
}/* IF */
else
failed = 1;
}/* IF */
else
failed = 1;
free( pCopy );
if( failed == 1 )
usage();
}/* IF */
else
crash_and_burn( "Cannot malloc copy of input string" );
}/* IF */
else
{
/* IP start and end points are specified */
pEnd = *argv;
/* parameters should be start and end ranges */
if( ( inet_addr( pStart ) != INADDR_NONE ) && ( inet_addr( pEnd ) != INADDR_NONE ) )
{
sStart.s_addr = inet_addr( pStart );
sEnd.s_addr = inet_addr( pEnd );
}/* IF */
else
usage();
}/* ELSE */
/* ensure that the end point is greater or equal to the start */
if( htonl( sEnd.s_addr ) >= htonl( sStart.s_addr ) )
{
/* start and end points should be determined, so generate list */
unsigned int uiDiff;
struct in_addr sTemp;
int iCount;
uiDiff = htonl( sEnd.s_addr ) - htonl( sStart.s_addr ) + 1;
for( iCount = 0; iCount < uiDiff; iCount++ )
{
sTemp.s_addr = sStart.s_addr + ntohl( iCount );
pTemp = cpystr( inet_ntoa( sTemp ) );
add_name( pTemp );
}/* FOR */
}/* IF */
else
usage();
}/* ELSE IF */
else
}
else if( *argv && generate_flag ) {
if(argc == 1) {
/* one target: we expect a cidr range (n.n.n.n/m) */
add_cidr(argv[0]);
}
else if(argc == 2) {
add_range(argv[0], argv[1]);
}
else {
usage();
}
}
else {
usage();
}
if( !num_hosts )
exit( 2 );
@ -1112,6 +1009,131 @@ int main( int argc, char **argv )
return 0;
} /* main() */
void add_cidr(char *addr)
{
char *addr_end;
char *mask_str;
unsigned long mask;
unsigned long bitmask;
int ret;
struct addrinfo addr_hints;
struct addrinfo *addr_res;
struct in_addr in_addr_tmp;
unsigned long net_addr;
unsigned long net_last;
char buffer[20];
/* Split address from mask */
addr_end = strchr(addr, '/');
if(addr_end == NULL) {
usage();
}
*addr_end = '\0';
mask_str = addr_end + 1;
mask = atoi(mask_str);
if(mask < 1 || mask > 30) {
fprintf(stderr, "Error: netmask must be between 1 and 30 (is: %s)\n", mask_str);
exit(2);
}
/* parse address (IPv4 only) */
memset(&addr_hints, 0, sizeof(struct addrinfo));
addr_hints.ai_family = AF_UNSPEC;
addr_hints.ai_flags = AI_NUMERICHOST;
ret = getaddrinfo(addr, NULL, &addr_hints, &addr_res);
if(ret) {
fprintf(stderr, "Error: can't parse address %s: %s\n", addr, gai_strerror(ret));
exit(2);
}
if(addr_res->ai_family != AF_INET) {
fprintf(stderr, "Error: -g works only with IPv4 addresses\n");
exit(2);
}
net_addr = ntohl(((struct sockaddr_in *) addr_res->ai_addr)->sin_addr.s_addr);
/* convert mask integer from 1 to 32 to a bitmask */
bitmask = ((unsigned long) 0xFFFFFFFF) << (32-mask);
/* calculate network range */
net_addr &= bitmask;
net_last = net_addr + ((unsigned long) 0x1 << (32-mask)) - 1;
/* add all hosts in that network (excluding network and broadcast address) */
while(++net_addr < net_last) {
in_addr_tmp.s_addr = htonl(net_addr);
inet_ntop(AF_INET, &in_addr_tmp, buffer, sizeof(buffer));
add_name(cpystr(buffer));
}
freeaddrinfo(addr_res);
// if(inet_addr(pCopy) != INADDR_NONE)
// {
// sStart.s_addr = inet_addr( pCopy );
//
// /* now find the bitmask */
// pTemp = ( char* )pStart + strlen( pCopy ) + 1;
//
// /* get the bits */
// iBits = 32 - atoi( pTemp );
//
// if( ( iBits < 32 ) && ( iBits >= 0 ) )
// {
// /* now make the end address */
// for( iBitpos = 0; iBitpos < iBits; iBitpos++ )
// iMask = iMask | 1 << iBitpos;
//
// sEnd.s_addr = sStart.s_addr | ntohl( iMask );
//
// }/* IF */
// else
// failed = 1;
//
// }/* IF */
// else
// failed = 1;
}
void add_range(char *start, char *end)
{
// /* IP start and end points are specified */
// pEnd = *argv;
//
// /* parameters should be start and end ranges */
// if( ( inet_addr( pStart ) != INADDR_NONE ) && ( inet_addr( pEnd ) != INADDR_NONE ) )
// {
// sStart.s_addr = inet_addr( pStart );
// sEnd.s_addr = inet_addr( pEnd );
//
// }/* IF */
// else
// usage();
//
// }/* ELSE */
//
// /* ensure that the end point is greater or equal to the start */
// if( htonl( sEnd.s_addr ) >= htonl( sStart.s_addr ) )
// {
// /* start and end points should be determined, so generate list */
// unsigned int uiDiff;
// struct in_addr sTemp;
// int iCount;
//
// uiDiff = htonl( sEnd.s_addr ) - htonl( sStart.s_addr ) + 1;
//
// for( iCount = 0; iCount < uiDiff; iCount++ )
// {
// sTemp.s_addr = sStart.s_addr + ntohl( iCount );
// pTemp = cpystr( inet_ntoa( sTemp ) );
// add_name( pTemp );
//
// }/* FOR */
// }/* IF */
// else
// usage();
}
void main_loop()
{
long lt;

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