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/***************************************************************************
* getaddrinfo.c -- A **PARTIAL** implementation of the getaddrinfo(3) *
* hostname resolution call. In particular, IPv6 is not supported and *
* neither are some of the flags. Service "names" are always returned as *
* port numbers. *
* *
***********************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/
*
***************************************************************************/
/* $Id$ */
#include "nbase.h"
#include <stdio.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <assert.h>
#if !defined(HAVE_GAI_STRERROR) || defined(__MINGW32__)
#ifdef __MINGW32__
#undef gai_strerror
#endif
const char *gai_strerror(int errcode) {
static char customerr[64];
switch (errcode) {
case EAI_FAMILY:
return "ai_family not supported";
case EAI_NODATA:
return "no address associated with hostname";
case EAI_NONAME:
return "hostname nor servname provided, or not known";
default:
Snprintf(customerr, sizeof(customerr), "unknown error (%d)", errcode);
return "unknown error.";
}
return NULL; /* unreached */
}
#endif
#ifdef __MINGW32__
char* WSAAPI gai_strerrorA (int errcode)
{
return gai_strerror(errcode);
}
#endif
#ifndef HAVE_GETADDRINFO
void freeaddrinfo(struct addrinfo *res) {
struct addrinfo *next;
do {
next = res->ai_next;
free(res);
} while ((res = next) != NULL);
}
/* Allocates and initializes a new AI structure with the port and IPv4
address specified in network byte order */
static struct addrinfo *new_ai(unsigned short portno, u32 addr)
{
struct addrinfo *ai;
ai = (struct addrinfo *) safe_malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
ai->ai_family = AF_INET;
ai->ai_addrlen = sizeof(struct sockaddr_in);
ai->ai_addr = (struct sockaddr *)(ai + 1);
ai->ai_addr->sa_family = AF_INET;
#if HAVE_SOCKADDR_SA_LEN
ai->ai_addr->sa_len = ai->ai_addrlen;
#endif
((struct sockaddr_in *)(ai)->ai_addr)->sin_port = portno;
((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
return(ai);
}
int getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res) {
struct addrinfo *cur, *prev = NULL;
struct hostent *he;
struct in_addr ip;
unsigned short portno;
int i;
if (service)
portno = htons(atoi(service));
else
portno = 0;
if (hints && hints->ai_flags & AI_PASSIVE) {
*res = new_ai(portno, htonl(0x00000000));
return 0;
}
if (!node) {
*res = new_ai(portno, htonl(0x7f000001));
return 0;
}
if (inet_pton(AF_INET, node, &ip)) {
*res = new_ai(portno, ip.s_addr);
return 0;
}
he = gethostbyname(node);
if (he && he->h_addr_list[0]) {
for (i = 0; he->h_addr_list[i]; i++) {
cur = new_ai(portno, ((struct in_addr *)he->h_addr_list[i])->s_addr);
if (prev)
prev->ai_next = cur;
else
*res = cur;
prev = cur;
}
return 0;
}
return EAI_NODATA;
}
#endif /* HAVE_GETADDRINFO */
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