/*************************************************************************** * 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) 1996-2022 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/ * * * ***************************************************************************/ /* $Id$ */ #include "nbase.h" #include #if HAVE_SYS_SOCKET_H #include #endif #if HAVE_NETINET_IN_H #include #endif #if HAVE_ARPA_INET_H #include #endif #if HAVE_NETDB_H #include #endif #include #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 */