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Diffstat (limited to 'nbase/getaddrinfo.c')
| -rw-r--r-- | nbase/getaddrinfo.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/nbase/getaddrinfo.c b/nbase/getaddrinfo.c new file mode 100644 index 0000000..63eecf2 --- /dev/null +++ b/nbase/getaddrinfo.c @@ -0,0 +1,191 @@ +/*************************************************************************** + * 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 */ |