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/***************************************************************************
* protocols.cc -- Functions relating to the protocol scan and mapping *
* between IPproto Number <-> name. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2022 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/ *
* *
***************************************************************************/
/* $Id: protocols.cc 38353 2022-02-18 17:38:46Z dmiller $ */
#include "protocols.h"
#include "NmapOps.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) {
pfatal("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;
/* Now we make sure our protocols don't have duplicates */
for(current = protocol_table[protno % PROTOCOL_TABLE_SIZE], 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 % PROTOCOL_TABLE_SIZE] = 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;
}
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