diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/lwres/getaddrinfo.c | 811 |
1 files changed, 811 insertions, 0 deletions
diff --git a/lib/lwres/getaddrinfo.c b/lib/lwres/getaddrinfo.c new file mode 100644 index 0000000..e26c944 --- /dev/null +++ b/lib/lwres/getaddrinfo.c @@ -0,0 +1,811 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + * + * This code is derived from software contributed to ISC by + * Berkeley Software Design, Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND BERKELEY SOFTWARE DESIGN, INC. + * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE + * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: getaddrinfo.c,v 1.54 2008/11/25 23:47:23 tbox Exp $ */ + +/*! \file */ + +/** + * lwres_getaddrinfo() is used to get a list of IP addresses and port + * numbers for host hostname and service servname. The function is the + * lightweight resolver's implementation of getaddrinfo() as defined in + * RFC2133. hostname and servname are pointers to null-terminated strings + * or NULL. hostname is either a host name or a numeric host address + * string: a dotted decimal IPv4 address or an IPv6 address. servname is + * either a decimal port number or a service name as listed in + * /etc/services. + * + * If the operating system does not provide a struct addrinfo, the + * following structure is used: + * + * \code + * struct addrinfo { + * int ai_flags; // AI_PASSIVE, AI_CANONNAME + * int ai_family; // PF_xxx + * int ai_socktype; // SOCK_xxx + * int ai_protocol; // 0 or IPPROTO_xxx for IPv4 and IPv6 + * size_t ai_addrlen; // length of ai_addr + * char *ai_canonname; // canonical name for hostname + * struct sockaddr *ai_addr; // binary address + * struct addrinfo *ai_next; // next structure in linked list + * }; + * \endcode + * + * + * hints is an optional pointer to a struct addrinfo. This structure can + * be used to provide hints concerning the type of socket that the caller + * supports or wishes to use. The caller can supply the following + * structure elements in *hints: + * + * <ul> + * <li>ai_family: + * The protocol family that should be used. When ai_family is set + * to PF_UNSPEC, it means the caller will accept any protocol + * family supported by the operating system.</li> + * + * <li>ai_socktype: + * denotes the type of socket -- SOCK_STREAM, SOCK_DGRAM or + * SOCK_RAW -- that is wanted. When ai_socktype is zero the caller + * will accept any socket type.</li> + * + * <li>ai_protocol: + * indicates which transport protocol is wanted: IPPROTO_UDP or + * IPPROTO_TCP. If ai_protocol is zero the caller will accept any + * protocol.</li> + * + * <li>ai_flags: + * Flag bits. If the AI_CANONNAME bit is set, a successful call to + * lwres_getaddrinfo() will return a null-terminated string + * containing the canonical name of the specified hostname in + * ai_canonname of the first addrinfo structure returned. Setting + * the AI_PASSIVE bit indicates that the returned socket address + * structure is intended for used in a call to bind(2). In this + * case, if the hostname argument is a NULL pointer, then the IP + * address portion of the socket address structure will be set to + * INADDR_ANY for an IPv4 address or IN6ADDR_ANY_INIT for an IPv6 + * address.<br /><br /> + * + * When ai_flags does not set the AI_PASSIVE bit, the returned + * socket address structure will be ready for use in a call to + * connect(2) for a connection-oriented protocol or connect(2), + * sendto(2), or sendmsg(2) if a connectionless protocol was + * chosen. The IP address portion of the socket address structure + * will be set to the loopback address if hostname is a NULL + * pointer and AI_PASSIVE is not set in ai_flags.<br /><br /> + * + * If ai_flags is set to AI_NUMERICHOST it indicates that hostname + * should be treated as a numeric string defining an IPv4 or IPv6 + * address and no name resolution should be attempted. + * </li></ul> + * + * All other elements of the struct addrinfo passed via hints must be + * zero. + * + * A hints of NULL is treated as if the caller provided a struct addrinfo + * initialized to zero with ai_familyset to PF_UNSPEC. + * + * After a successful call to lwres_getaddrinfo(), *res is a pointer to a + * linked list of one or more addrinfo structures. Each struct addrinfo + * in this list cn be processed by following the ai_next pointer, until a + * NULL pointer is encountered. The three members ai_family, ai_socktype, + * and ai_protocol in each returned addrinfo structure contain the + * corresponding arguments for a call to socket(2). For each addrinfo + * structure in the list, the ai_addr member points to a filled-in socket + * address structure of length ai_addrlen. + * + * All of the information returned by lwres_getaddrinfo() is dynamically + * allocated: the addrinfo structures, and the socket address structures + * and canonical host name strings pointed to by the addrinfostructures. + * Memory allocated for the dynamically allocated structures created by a + * successful call to lwres_getaddrinfo() is released by + * lwres_freeaddrinfo(). ai is a pointer to a struct addrinfo created by + * a call to lwres_getaddrinfo(). + * + * \section lwresreturn RETURN VALUES + * + * lwres_getaddrinfo() returns zero on success or one of the error codes + * listed in gai_strerror() if an error occurs. If both hostname and + * servname are NULL lwres_getaddrinfo() returns #EAI_NONAME. + * + * \section lwressee SEE ALSO + * + * lwres(3), lwres_getaddrinfo(), lwres_freeaddrinfo(), + * lwres_gai_strerror(), RFC2133, getservbyname(3), connect(2), + * sendto(2), sendmsg(2), socket(2). + */ + +#include <config.h> + +#include <inttypes.h> +#include <errno.h> +#include <string.h> + +#include <lwres/lwres.h> +#include <lwres/net.h> +#include <lwres/netdb.h> +#include <lwres/stdlib.h> +#include <lwres/string.h> + +#define SA(addr) ((struct sockaddr *)(addr)) +#define SIN(addr) ((struct sockaddr_in *)(addr)) +#define SIN6(addr) ((struct sockaddr_in6 *)(addr)) +#define SLOCAL(addr) ((struct sockaddr_un *)(addr)) + +/*! \struct addrinfo + */ +static struct addrinfo + *ai_reverse(struct addrinfo *oai), + *ai_clone(struct addrinfo *oai, int family), + *ai_alloc(int family, int addrlen); +#ifdef AF_LOCAL +static int get_local(const char *name, int socktype, struct addrinfo **res); +#endif + +static int add_ipv4(const char *hostname, int flags, struct addrinfo **aip, + int socktype, int port); +static int add_ipv6(const char *hostname, int flags, struct addrinfo **aip, + int socktype, int port); +static void set_order(int, int (**)(const char *, int, struct addrinfo **, + int, int)); + +#define FOUND_IPV4 0x1 +#define FOUND_IPV6 0x2 +#define FOUND_MAX 2 + +#define ISC_AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST) +/*% Get a list of IP addresses and port numbers for host hostname and service servname. */ +int +lwres_getaddrinfo(const char *hostname, const char *servname, + const struct addrinfo *hints, struct addrinfo **res) +{ + struct servent *sp; + const char *proto; + int family, socktype, flags, protocol; + struct addrinfo *ai, *ai_list; + int port, err, i; + int (*net_order[FOUND_MAX+1])(const char *, int, struct addrinfo **, + int, int); + + if (hostname == NULL && servname == NULL) + return (EAI_NONAME); + + proto = NULL; + if (hints != NULL) { + if ((hints->ai_flags & ~(ISC_AI_MASK)) != 0) + return (EAI_BADFLAGS); + if (hints->ai_addrlen || hints->ai_canonname || + hints->ai_addr || hints->ai_next) { + errno = EINVAL; + return (EAI_SYSTEM); + } + family = hints->ai_family; + socktype = hints->ai_socktype; + protocol = hints->ai_protocol; + flags = hints->ai_flags; + switch (family) { + case AF_UNSPEC: + switch (hints->ai_socktype) { + case SOCK_STREAM: + proto = "tcp"; + break; + case SOCK_DGRAM: + proto = "udp"; + break; + } + break; + case AF_INET: + case AF_INET6: + switch (hints->ai_socktype) { + case 0: + break; + case SOCK_STREAM: + proto = "tcp"; + break; + case SOCK_DGRAM: + proto = "udp"; + break; + case SOCK_RAW: + break; + default: + return (EAI_SOCKTYPE); + } + break; +#ifdef AF_LOCAL + case AF_LOCAL: + switch (hints->ai_socktype) { + case 0: + break; + case SOCK_STREAM: + break; + case SOCK_DGRAM: + break; + default: + return (EAI_SOCKTYPE); + } + break; +#endif + default: + return (EAI_FAMILY); + } + } else { + protocol = 0; + family = 0; + socktype = 0; + flags = 0; + } + +#ifdef AF_LOCAL + /*! + * First, deal with AF_LOCAL. If the family was not set, + * then assume AF_LOCAL if the first character of the + * hostname/servname is '/'. + */ + + if (hostname != NULL && + (family == AF_LOCAL || (family == 0 && *hostname == '/'))) + return (get_local(hostname, socktype, res)); + + if (servname != NULL && + (family == AF_LOCAL || (family == 0 && *servname == '/'))) + return (get_local(servname, socktype, res)); +#endif + + /* + * Ok, only AF_INET and AF_INET6 left. + */ + ai_list = NULL; + + /* + * First, look up the service name (port) if it was + * requested. If the socket type wasn't specified, then + * try and figure it out. + */ + if (servname != NULL) { + char *e; + + port = strtol(servname, &e, 10); + if (*e == '\0') { + if (socktype == 0) + return (EAI_SOCKTYPE); + if (port < 0 || port > 65535) + return (EAI_SERVICE); + port = htons((unsigned short) port); + } else { + sp = getservbyname(servname, proto); + if (sp == NULL) + return (EAI_SERVICE); + port = sp->s_port; + if (socktype == 0) { + if (strcmp(sp->s_proto, "tcp") == 0) + socktype = SOCK_STREAM; + else if (strcmp(sp->s_proto, "udp") == 0) + socktype = SOCK_DGRAM; + } + } + } else + port = 0; + + /* + * Next, deal with just a service name, and no hostname. + * (we verified that one of them was non-null up above). + */ + if (hostname == NULL && (flags & AI_PASSIVE) != 0) { + if (family == AF_INET || family == 0) { + ai = ai_alloc(AF_INET, sizeof(struct sockaddr_in)); + if (ai == NULL) + return (EAI_MEMORY); + ai->ai_socktype = socktype; + ai->ai_protocol = protocol; + SIN(ai->ai_addr)->sin_port = port; + ai->ai_next = ai_list; + ai_list = ai; + } + + if (family == AF_INET6 || family == 0) { + ai = ai_alloc(AF_INET6, sizeof(struct sockaddr_in6)); + if (ai == NULL) { + lwres_freeaddrinfo(ai_list); + return (EAI_MEMORY); + } + ai->ai_socktype = socktype; + ai->ai_protocol = protocol; + SIN6(ai->ai_addr)->sin6_port = port; + ai->ai_next = ai_list; + ai_list = ai; + } + + *res = ai_list; + return (0); + } + + /* + * If the family isn't specified or AI_NUMERICHOST specified, + * check first to see if it is a numeric address. + * Though the gethostbyname2() routine + * will recognize numeric addresses, it will only recognize + * the format that it is being called for. Thus, a numeric + * AF_INET address will be treated by the AF_INET6 call as + * a domain name, and vice versa. Checking for both numerics + * here avoids that. + */ + if (hostname != NULL && + (family == 0 || (flags & AI_NUMERICHOST) != 0)) { + char abuf[sizeof(struct in6_addr)]; + char nbuf[NI_MAXHOST]; + int addrsize, addroff; +#ifdef LWRES_HAVE_SIN6_SCOPE_ID + char *p, *ep; + char ntmp[NI_MAXHOST]; + uint32_t scopeid; +#endif + +#ifdef LWRES_HAVE_SIN6_SCOPE_ID + /* + * Scope identifier portion. + */ + ntmp[0] = '\0'; + if (strchr(hostname, '%') != NULL) { + strncpy(ntmp, hostname, sizeof(ntmp) - 1); + ntmp[sizeof(ntmp) - 1] = '\0'; + p = strchr(ntmp, '%'); + ep = NULL; + + /* + * Vendors may want to support non-numeric + * scopeid around here. + */ + + if (p != NULL) + scopeid = (uint32_t)strtoul(p + 1, + &ep, 10); + if (p != NULL && ep != NULL && ep[0] == '\0') + *p = '\0'; + else { + ntmp[0] = '\0'; + scopeid = 0; + } + } else + scopeid = 0; +#endif + + if (lwres_net_pton(AF_INET, hostname, (struct in_addr *)abuf) + == 1) + { + if (family == AF_INET6) { + /* + * Convert to a V4 mapped address. + */ + struct in6_addr *a6 = (struct in6_addr *)abuf; + memmove(&a6->s6_addr[12], &a6->s6_addr[0], 4); + memset(&a6->s6_addr[10], 0xff, 2); + memset(&a6->s6_addr[0], 0, 10); + goto inet6_addr; + } + addrsize = sizeof(struct in_addr); + addroff = offsetof(struct sockaddr_in, sin_addr); + family = AF_INET; + goto common; +#ifdef LWRES_HAVE_SIN6_SCOPE_ID + } else if (ntmp[0] != '\0' && + lwres_net_pton(AF_INET6, ntmp, abuf) == 1) + { + if (family && family != AF_INET6) + return (EAI_NONAME); + addrsize = sizeof(struct in6_addr); + addroff = offsetof(struct sockaddr_in6, sin6_addr); + family = AF_INET6; + goto common; +#endif + } else if (lwres_net_pton(AF_INET6, hostname, abuf) == 1) { + if (family != 0 && family != AF_INET6) + return (EAI_NONAME); + inet6_addr: + addrsize = sizeof(struct in6_addr); + addroff = offsetof(struct sockaddr_in6, sin6_addr); + family = AF_INET6; + + common: + ai = ai_clone(ai_list, family); + if (ai == NULL) + return (EAI_MEMORY); + ai_list = ai; + ai->ai_socktype = socktype; + SIN(ai->ai_addr)->sin_port = port; + memmove((char *)ai->ai_addr + addroff, abuf, addrsize); + if (flags & AI_CANONNAME) { +#if defined(LWRES_HAVE_SIN6_SCOPE_ID) + if (ai->ai_family == AF_INET6) + SIN6(ai->ai_addr)->sin6_scope_id = + scopeid; +#endif + if (lwres_getnameinfo(ai->ai_addr, + ai->ai_addrlen, nbuf, sizeof(nbuf), + NULL, 0, + NI_NUMERICHOST) == 0) { + ai->ai_canonname = strdup(nbuf); + if (ai->ai_canonname == NULL) { + lwres_freeaddrinfo(ai_list); + return (EAI_MEMORY); + } + } else { + /* XXX raise error? */ + ai->ai_canonname = NULL; + } + } + goto done; + } else if ((flags & AI_NUMERICHOST) != 0) { + return (EAI_NONAME); + } + } + + set_order(family, net_order); + for (i = 0; i < FOUND_MAX; i++) { + if (net_order[i] == NULL) + break; + err = (net_order[i])(hostname, flags, &ai_list, + socktype, port); + if (err != 0) + return (err); + } + + if (ai_list == NULL) + return (EAI_NODATA); + +done: + ai_list = ai_reverse(ai_list); + + *res = ai_list; + return (0); +} + +static char * +lwres_strsep(char **stringp, const char *delim) { + char *string = *stringp; + char *s; + const char *d; + char sc, dc; + + if (string == NULL) + return (NULL); + + for (s = string; *s != '\0'; s++) { + sc = *s; + for (d = delim; (dc = *d) != '\0'; d++) + if (sc == dc) { + *s++ = '\0'; + *stringp = s; + return (string); + } + } + *stringp = NULL; + return (string); +} + +static void +set_order(int family, int (**net_order)(const char *, int, struct addrinfo **, + int, int)) +{ + char *order, *tok; + int found; + + if (family) { + switch (family) { + case AF_INET: + *net_order++ = add_ipv4; + break; + case AF_INET6: + *net_order++ = add_ipv6; + break; + } + } else { + order = getenv("NET_ORDER"); + found = 0; + while (order != NULL) { + /* + * We ignore any unknown names. + */ + tok = lwres_strsep(&order, ":"); + if (strcasecmp(tok, "inet6") == 0) { + if ((found & FOUND_IPV6) == 0) + *net_order++ = add_ipv6; + found |= FOUND_IPV6; + } else if (strcasecmp(tok, "inet") == 0 || + strcasecmp(tok, "inet4") == 0) { + if ((found & FOUND_IPV4) == 0) + *net_order++ = add_ipv4; + found |= FOUND_IPV4; + } + } + + /* + * Add in anything that we didn't find. + */ + if ((found & FOUND_IPV4) == 0) + *net_order++ = add_ipv4; + if ((found & FOUND_IPV6) == 0) + *net_order++ = add_ipv6; + } + *net_order = NULL; + return; +} + +static char v4_loop[4] = { 127, 0, 0, 1 }; + +/* + * The test against 0 is there to keep the Solaris compiler + * from complaining about "end-of-loop code not reached". + */ +#define SETERROR(code) \ + do { result = (code); \ + if (result != 0) goto cleanup; \ + } while (0) + +static int +add_ipv4(const char *hostname, int flags, struct addrinfo **aip, + int socktype, int port) +{ + struct addrinfo *ai; + lwres_context_t *lwrctx = NULL; + lwres_gabnresponse_t *by = NULL; + lwres_addr_t *addr; + lwres_result_t lwres; + int result = 0; + + lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0); + if (lwres != LWRES_R_SUCCESS) + SETERROR(EAI_FAIL); + (void) lwres_conf_parse(lwrctx, lwres_resolv_conf); + if (hostname == NULL && (flags & AI_PASSIVE) == 0) { + ai = ai_clone(*aip, AF_INET); + if (ai == NULL) + SETERROR(EAI_MEMORY); + + *aip = ai; + ai->ai_socktype = socktype; + SIN(ai->ai_addr)->sin_port = port; + memmove(&SIN(ai->ai_addr)->sin_addr, v4_loop, 4); + } else { + lwres = lwres_getaddrsbyname(lwrctx, hostname, + LWRES_ADDRTYPE_V4, &by); + if (lwres != LWRES_R_SUCCESS) { + if (lwres == LWRES_R_NOTFOUND) + goto cleanup; + else + SETERROR(EAI_FAIL); + } + addr = LWRES_LIST_HEAD(by->addrs); + while (addr != NULL) { + ai = ai_clone(*aip, AF_INET); + if (ai == NULL) + SETERROR(EAI_MEMORY); + *aip = ai; + ai->ai_socktype = socktype; + SIN(ai->ai_addr)->sin_port = port; + memmove(&SIN(ai->ai_addr)->sin_addr, + addr->address, 4); + if (flags & AI_CANONNAME) { + ai->ai_canonname = strdup(by->realname); + if (ai->ai_canonname == NULL) + SETERROR(EAI_MEMORY); + } + addr = LWRES_LIST_NEXT(addr, link); + } + } + cleanup: + if (by != NULL) + lwres_gabnresponse_free(lwrctx, &by); + if (lwrctx != NULL) { + lwres_conf_clear(lwrctx); + lwres_context_destroy(&lwrctx); + } + return (result); +} + +static char v6_loop[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }; + +static int +add_ipv6(const char *hostname, int flags, struct addrinfo **aip, + int socktype, int port) +{ + struct addrinfo *ai; + lwres_context_t *lwrctx = NULL; + lwres_gabnresponse_t *by = NULL; + lwres_addr_t *addr; + lwres_result_t lwres; + int result = 0; + + lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0); + if (lwres != LWRES_R_SUCCESS) + SETERROR(EAI_FAIL); + (void) lwres_conf_parse(lwrctx, lwres_resolv_conf); + + if (hostname == NULL && (flags & AI_PASSIVE) == 0) { + ai = ai_clone(*aip, AF_INET6); + if (ai == NULL) + SETERROR(EAI_MEMORY); + + *aip = ai; + ai->ai_socktype = socktype; + SIN6(ai->ai_addr)->sin6_port = port; + memmove(&SIN6(ai->ai_addr)->sin6_addr, v6_loop, 16); + } else { + lwres = lwres_getaddrsbyname(lwrctx, hostname, + LWRES_ADDRTYPE_V6, &by); + if (lwres != LWRES_R_SUCCESS) { + if (lwres == LWRES_R_NOTFOUND) + goto cleanup; + else + SETERROR(EAI_FAIL); + } + addr = LWRES_LIST_HEAD(by->addrs); + while (addr != NULL) { + ai = ai_clone(*aip, AF_INET6); + if (ai == NULL) + SETERROR(EAI_MEMORY); + *aip = ai; + ai->ai_socktype = socktype; + SIN6(ai->ai_addr)->sin6_port = port; + memmove(&SIN6(ai->ai_addr)->sin6_addr, + addr->address, 16); + if (flags & AI_CANONNAME) { + ai->ai_canonname = strdup(by->realname); + if (ai->ai_canonname == NULL) + SETERROR(EAI_MEMORY); + } + addr = LWRES_LIST_NEXT(addr, link); + } + } + cleanup: + if (by != NULL) + lwres_gabnresponse_free(lwrctx, &by); + if (lwrctx != NULL) { + lwres_conf_clear(lwrctx); + lwres_context_destroy(&lwrctx); + } + return (result); +} + +/*% Free address info. */ +void +lwres_freeaddrinfo(struct addrinfo *ai) { + struct addrinfo *ai_next; + + while (ai != NULL) { + ai_next = ai->ai_next; + if (ai->ai_addr != NULL) + free(ai->ai_addr); + if (ai->ai_canonname) + free(ai->ai_canonname); + free(ai); + ai = ai_next; + } +} + +#ifdef AF_LOCAL +static int +get_local(const char *name, int socktype, struct addrinfo **res) { + struct addrinfo *ai; + struct sockaddr_un *slocal; + + if (socktype == 0) + return (EAI_SOCKTYPE); + + if (strlen(name) >= sizeof(slocal->sun_path)) + return (EAI_OVERFLOW); + + ai = ai_alloc(AF_LOCAL, sizeof(*slocal)); + if (ai == NULL) + return (EAI_MEMORY); + + slocal = SLOCAL(ai->ai_addr); + strncpy(slocal->sun_path, name, sizeof(slocal->sun_path)); + slocal->sun_path[sizeof(slocal->sun_path) - 1] = '\0'; + + ai->ai_socktype = socktype; + /* + * ai->ai_flags, ai->ai_protocol, ai->ai_canonname, + * and ai->ai_next were initialized to zero. + */ + + *res = ai; + return (0); +} +#endif + +/*! + * Allocate an addrinfo structure, and a sockaddr structure + * of the specificed length. We initialize: + * ai_addrlen + * ai_family + * ai_addr + * ai_addr->sa_family + * ai_addr->sa_len (LWRES_PLATFORM_HAVESALEN) + * and everything else is initialized to zero. + */ +static struct addrinfo * +ai_alloc(int family, int addrlen) { + struct addrinfo *ai; + + ai = (struct addrinfo *)calloc(1, sizeof(*ai)); + if (ai == NULL) + return (NULL); + + ai->ai_addr = SA(calloc(1, addrlen)); + if (ai->ai_addr == NULL) { + free(ai); + return (NULL); + } + ai->ai_addrlen = addrlen; + ai->ai_family = family; + ai->ai_addr->sa_family = family; +#ifdef LWRES_PLATFORM_HAVESALEN + ai->ai_addr->sa_len = addrlen; +#endif + return (ai); +} + +static struct addrinfo * +ai_clone(struct addrinfo *oai, int family) { + struct addrinfo *ai; + + ai = ai_alloc(family, ((family == AF_INET6) ? + sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in))); + + if (ai == NULL) { + lwres_freeaddrinfo(oai); + return (NULL); + } + if (oai == NULL) + return (ai); + + ai->ai_flags = oai->ai_flags; + ai->ai_socktype = oai->ai_socktype; + ai->ai_protocol = oai->ai_protocol; + ai->ai_canonname = NULL; + ai->ai_next = oai; + return (ai); +} + +static struct addrinfo * +ai_reverse(struct addrinfo *oai) { + struct addrinfo *nai, *tai; + + nai = NULL; + + while (oai != NULL) { + /* + * Grab one off the old list. + */ + tai = oai; + oai = oai->ai_next; + /* + * Put it on the front of the new list. + */ + tai->ai_next = nai; + nai = tai; + } + return (nai); +} |