/***************************************************************************
* protocols.cc -- Functions relating to the protocol scan and mapping *
* between IPproto Number <-> name. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
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***************************************************************************/
/* $Id$ */
#include "protocols.h"
#include "NmapOps.h"
#include "services.h"
#include "charpool.h"
#include "nmap_error.h"
#include "utils.h"
extern NmapOps o;
static int numipprots = 0;
static struct protocol_list *protocol_table[PROTOCOL_TABLE_SIZE];
static int protocols_initialized = 0;
static int nmap_protocols_init() {
if (protocols_initialized) return 0;
char filename[512];
FILE *fp;
char protocolname[128];
unsigned short protno;
char *p;
char line[1024];
int lineno = 0;
struct protocol_list *current, *previous;
int res;
if (nmap_fetchfile(filename, sizeof(filename), "nmap-protocols") != 1) {
error("Unable to find nmap-protocols! Resorting to /etc/protocols");
strcpy(filename, "/etc/protocols");
}
fp = fopen(filename, "r");
if (!fp) {
fatal("Unable to open %s for reading protocol information", filename);
}
/* Record where this data file was found. */
o.loaded_data_files["nmap-protocols"] = filename;
memset(protocol_table, 0, sizeof(protocol_table));
while(fgets(line, sizeof(line), fp)) {
lineno++;
p = line;
while(*p && isspace((int) (unsigned char) *p))
p++;
if (*p == '#')
continue;
res = sscanf(line, "%127s %hu", protocolname, &protno);
if (res !=2)
continue;
protno = htons(protno);
/* Now we make sure our protocols don't have duplicates */
for(current = protocol_table[0], previous = NULL;
current; current = current->next) {
if (protno == current->protoent->p_proto) {
if (o.debugging) {
error("Protocol %d is duplicated in protocols file %s", ntohs(protno), filename);
}
break;
}
previous = current;
}
if (current)
continue;
numipprots++;
current = (struct protocol_list *) cp_alloc(sizeof(struct protocol_list));
current->protoent = (struct protoent *) cp_alloc(sizeof(struct protoent));
current->next = NULL;
if (previous == NULL) {
protocol_table[protno] = current;
} else {
previous->next = current;
}
current->protoent->p_name = cp_strdup(protocolname);
current->protoent->p_proto = protno;
current->protoent->p_aliases = NULL;
}
fclose(fp);
protocols_initialized = 1;
return 0;
}
/* Adds protocols whose names match mask to porttbl.
* Increases the prot_count in ports by the number of protocols added.
* Returns the number of protocols added.
*/
int addprotocolsfromservmask(char *mask, u8 *porttbl) {
struct protocol_list *current;
int bucket, t=0;
if (!protocols_initialized && nmap_protocols_init() == -1)
fatal("%s: Couldn't get protocol numbers", __func__);
for(bucket = 0; bucket < PROTOCOL_TABLE_SIZE; bucket++) {
for(current = protocol_table[bucket % PROTOCOL_TABLE_SIZE]; current; current = current->next) {
if (wildtest(mask, current->protoent->p_name)) {
porttbl[ntohs(current->protoent->p_proto)] |= SCAN_PROTOCOLS;
t++;
}
}
}
return t;
}
struct protoent *nmap_getprotbynum(int num) {
struct protocol_list *current;
if (nmap_protocols_init() == -1)
return NULL;
for(current = protocol_table[num % PROTOCOL_TABLE_SIZE];
current; current = current->next) {
if (num == current->protoent->p_proto)
return current->protoent;
}
/* Couldn't find it ... oh well. */
return NULL;
}