diff options
Diffstat (limited to 'src/lib/ares__addrinfo2hostent.c')
| -rw-r--r-- | src/lib/ares__addrinfo2hostent.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/src/lib/ares__addrinfo2hostent.c b/src/lib/ares__addrinfo2hostent.c new file mode 100644 index 0000000..efb145c --- /dev/null +++ b/src/lib/ares__addrinfo2hostent.c @@ -0,0 +1,266 @@ +/* Copyright 1998 by the Massachusetts Institute of Technology. + * Copyright 2005 Dominick Meglio + * Copyright (C) 2019 by Andrew Selivanov + * Copyright (C) 2021 by Brad House + * + * Permission to use, copy, modify, and distribute this + * software and its documentation for any purpose and without + * fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting + * documentation, and that the name of M.I.T. not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" + * without express or implied warranty. + */ + +#include "ares_setup.h" + +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif +#ifdef HAVE_NETDB_H +# include <netdb.h> +#endif +#ifdef HAVE_ARPA_INET_H +# include <arpa/inet.h> +#endif + +#include "ares_nameser.h" + +#ifdef HAVE_STRINGS_H +# include <strings.h> +#endif + +#ifdef HAVE_LIMITS_H +# include <limits.h> +#endif + +#include "ares.h" +#include "ares_dns.h" +#include "ares_inet_net_pton.h" +#include "ares_private.h" + +int ares__addrinfo2hostent(const struct ares_addrinfo *ai, int family, + struct hostent **host) +{ + struct ares_addrinfo_node *next; + struct ares_addrinfo_cname *next_cname; + char **aliases = NULL; + char *addrs = NULL; + int naliases = 0, naddrs = 0, alias = 0, i; + + if (ai == NULL || host == NULL) + return ARES_EBADQUERY; + + *host = ares_malloc(sizeof(**host)); + if (!(*host)) + { + goto enomem; + } + memset(*host, 0, sizeof(**host)); + + /* Use the first node of the response as the family, since hostent can only + * represent one family. We assume getaddrinfo() returned a sorted list if + * the user requested AF_UNSPEC. */ + if (family == AF_UNSPEC && ai->nodes) + family = ai->nodes->ai_family; + + next = ai->nodes; + while (next) + { + if(next->ai_family == family) + { + ++naddrs; + } + next = next->ai_next; + } + + next_cname = ai->cnames; + while (next_cname) + { + if(next_cname->alias) + ++naliases; + next_cname = next_cname->next; + } + + aliases = ares_malloc((naliases + 1) * sizeof(char *)); + if (!aliases) + { + goto enomem; + } + (*host)->h_aliases = aliases; + memset(aliases, 0, (naliases + 1) * sizeof(char *)); + + if (naliases) + { + next_cname = ai->cnames; + while (next_cname) + { + if(next_cname->alias) { + aliases[alias] = ares_strdup(next_cname->alias); + if (!aliases[alias]) { + goto enomem; + } + alias++; + } + next_cname = next_cname->next; + } + } + + + (*host)->h_addr_list = ares_malloc((naddrs + 1) * sizeof(char *)); + if (!(*host)->h_addr_list) + { + goto enomem; + } + + memset((*host)->h_addr_list, 0, (naddrs + 1) * sizeof(char *)); + + if (ai->cnames) + { + (*host)->h_name = ares_strdup(ai->cnames->name); + if ((*host)->h_name == NULL && ai->cnames->name) + { + goto enomem; + } + } + else + { + (*host)->h_name = ares_strdup(ai->name); + if ((*host)->h_name == NULL && ai->name) + { + goto enomem; + } + } + + (*host)->h_addrtype = family; + (*host)->h_length = (family == AF_INET)? + sizeof(struct in_addr):sizeof(struct ares_in6_addr); + + if (naddrs) + { + addrs = ares_malloc(naddrs * (*host)->h_length); + if (!addrs) + { + goto enomem; + } + + i = 0; + next = ai->nodes; + while (next) + { + if(next->ai_family == family) + { + (*host)->h_addr_list[i] = addrs + (i * (*host)->h_length); + if (family == AF_INET6) + { + memcpy((*host)->h_addr_list[i], + &(CARES_INADDR_CAST(struct sockaddr_in6 *, next->ai_addr)->sin6_addr), + (*host)->h_length); + } + else + { + memcpy((*host)->h_addr_list[i], + &(CARES_INADDR_CAST(struct sockaddr_in *, next->ai_addr)->sin_addr), + (*host)->h_length); + } + ++i; + } + next = next->ai_next; + } + + if (i == 0) + { + ares_free(addrs); + } + } + + if (naddrs == 0 && naliases == 0) + { + ares_free_hostent(*host); + *host = NULL; + return ARES_ENODATA; + } + + return ARES_SUCCESS; + +enomem: + ares_free_hostent(*host); + *host = NULL; + return ARES_ENOMEM; +} + + +int ares__addrinfo2addrttl(const struct ares_addrinfo *ai, int family, + int req_naddrttls, struct ares_addrttl *addrttls, + struct ares_addr6ttl *addr6ttls, int *naddrttls) +{ + struct ares_addrinfo_node *next; + struct ares_addrinfo_cname *next_cname; + int cname_ttl = INT_MAX; + + if (family != AF_INET && family != AF_INET6) + return ARES_EBADQUERY; + + if (ai == NULL || naddrttls == NULL) + return ARES_EBADQUERY; + + if (family == AF_INET && addrttls == NULL) + return ARES_EBADQUERY; + + if (family == AF_INET6 && addr6ttls == NULL) + return ARES_EBADQUERY; + + if (req_naddrttls == 0) + return ARES_EBADQUERY; + + *naddrttls = 0; + + next_cname = ai->cnames; + while (next_cname) + { + if(next_cname->ttl < cname_ttl) + cname_ttl = next_cname->ttl; + next_cname = next_cname->next; + } + + next = ai->nodes; + while (next) + { + if(next->ai_family == family) + { + if (*naddrttls < req_naddrttls) + { + if (family == AF_INET6) + { + if(next->ai_ttl > cname_ttl) + addr6ttls[*naddrttls].ttl = cname_ttl; + else + addr6ttls[*naddrttls].ttl = next->ai_ttl; + + memcpy(&addr6ttls[*naddrttls].ip6addr, + &(CARES_INADDR_CAST(struct sockaddr_in6 *, next->ai_addr)->sin6_addr), + sizeof(struct ares_in6_addr)); + } + else + { + if(next->ai_ttl > cname_ttl) + addrttls[*naddrttls].ttl = cname_ttl; + else + addrttls[*naddrttls].ttl = next->ai_ttl; + memcpy(&addrttls[*naddrttls].ipaddr, + &(CARES_INADDR_CAST(struct sockaddr_in *, next->ai_addr)->sin_addr), + sizeof(struct in_addr)); + } + (*naddrttls)++; + } + } + next = next->ai_next; + } + + return ARES_SUCCESS; +} + |