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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/util/myaddrinfo.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/myaddrinfo.c')
-rw-r--r--src/util/myaddrinfo.c888
1 files changed, 888 insertions, 0 deletions
diff --git a/src/util/myaddrinfo.c b/src/util/myaddrinfo.c
new file mode 100644
index 0000000..a52e076
--- /dev/null
+++ b/src/util/myaddrinfo.c
@@ -0,0 +1,888 @@
+/*++
+/* NAME
+/* myaddrinfo 3
+/* SUMMARY
+/* addrinfo encapsulation and emulation
+/* SYNOPSIS
+/* #include <myaddrinfo.h>
+/*
+/* #define MAI_V4ADDR_BITS ...
+/* #define MAI_V6ADDR_BITS ...
+/* #define MAI_V4ADDR_BYTES ...
+/* #define MAI_V6ADDR_BYTES ...
+/*
+/* typedef struct { char buf[....]; } MAI_HOSTNAME_STR;
+/* typedef struct { char buf[....]; } MAI_HOSTADDR_STR;
+/* typedef struct { char buf[....]; } MAI_SERVNAME_STR;
+/* typedef struct { char buf[....]; } MAI_SERVPORT_STR;
+/*
+/* int hostname_to_sockaddr(hostname, service, socktype, result)
+/* const char *hostname;
+/* const char *service;
+/* int socktype;
+/* struct addrinfo **result;
+/*
+/* int hostname_to_sockaddr_pf(hostname, pf, service, socktype, result)
+/* const char *hostname;
+/* int pf;
+/* const char *service;
+/* int socktype;
+/* struct addrinfo **result;
+/*
+/* int hostaddr_to_sockaddr(hostaddr, service, socktype, result)
+/* const char *hostaddr;
+/* const char *service;
+/* int socktype;
+/* struct addrinfo **result;
+/*
+/* int sockaddr_to_hostaddr(sa, salen, hostaddr, portnum, socktype)
+/* const struct sockaddr *sa;
+/* SOCKADDR_SIZE salen;
+/* MAI_HOSTADDR_STR *hostaddr;
+/* MAI_SERVPORT_STR *portnum;
+/* int socktype;
+/*
+/* int sockaddr_to_hostname(sa, salen, hostname, service, socktype)
+/* const struct sockaddr *sa;
+/* SOCKADDR_SIZE salen;
+/* MAI_HOSTNAME_STR *hostname;
+/* MAI_SERVNAME_STR *service;
+/* int socktype;
+/*
+/* const char *MAI_STRERROR(error)
+/* int error;
+/* DESCRIPTION
+/* This module provides a simplified user interface to the
+/* getaddrinfo(3) and getnameinfo(3) routines (which provide
+/* a unified interface to manipulate IPv4 and IPv6 socket
+/* address structures).
+/*
+/* On systems without getaddrinfo(3) and getnameinfo(3) support,
+/* emulation for IPv4 only can be enabled by defining
+/* EMULATE_IPV4_ADDRINFO.
+/*
+/* hostname_to_sockaddr() looks up the binary addresses for
+/* the specified symbolic hostname or numeric address. The
+/* result should be destroyed with freeaddrinfo(). A null host
+/* pointer converts to the null host address.
+/*
+/* hostname_to_sockaddr_pf() is an extended interface that
+/* provides a protocol family override.
+/*
+/* hostaddr_to_sockaddr() converts a printable network address
+/* into the corresponding binary form. The result should be
+/* destroyed with freeaddrinfo(). A null host pointer converts
+/* to the null host address.
+/*
+/* sockaddr_to_hostaddr() converts a binary network address
+/* into printable form. The result buffers should be large
+/* enough to hold the printable address or port including the
+/* null terminator.
+/* This function strips off the IPv6 datalink suffix.
+/*
+/* sockaddr_to_hostname() converts a binary network address
+/* into a hostname or service. The result buffer should be
+/* large enough to hold the hostname or service including the
+/* null terminator. This routine rejects malformed hostnames
+/* or numeric hostnames and pretends that the lookup failed.
+/*
+/* MAI_STRERROR() is an unsafe macro (it evaluates the argument
+/* multiple times) that invokes strerror() or gai_strerror()
+/* as appropriate.
+/*
+/* This module exports the following constants that should be
+/* user for storage allocation of name or address information:
+/* .IP MAI_V4ADDR_BITS
+/* .IP MAI_V6ADDR_BITS
+/* .IP MAI_V4ADDR_BYTES
+/* .IP MAI_V6ADDR_BYTES
+/* The number of bits or bytes needed to store a binary
+/* IPv4 or IPv6 network address.
+/* .PP
+/* The types MAI_HOST{NAME,ADDR}_STR and MAI_SERV{NAME,PORT}_STR
+/* implement buffers for the storage of the string representations
+/* of symbolic or numerical hosts or services. Do not use
+/* buffer types other than the ones that are expected here,
+/* or things will blow up with buffer overflow problems.
+/*
+/* Arguments:
+/* .IP hostname
+/* On input to hostname_to_sockaddr(), a numeric or symbolic
+/* hostname, or a null pointer (meaning the wild-card listen
+/* address). On output from sockaddr_to_hostname(), storage
+/* for the result hostname, or a null pointer.
+/* .IP pf
+/* Protocol type: PF_UNSPEC (meaning: use any protocol that is
+/* available), PF_INET, or PF_INET6. This argument is ignored
+/* in EMULATE_IPV4_ADDRINFO mode.
+/* .IP hostaddr
+/* On input to hostaddr_to_sockaddr(), a numeric hostname,
+/* or a null pointer (meaning the wild-card listen address).
+/* On output from sockaddr_to_hostaddr(), storage for the
+/* result hostaddress, or a null pointer.
+/* .IP service
+/* On input to hostname/addr_to_sockaddr(), a numeric or
+/* symbolic service name, or a null pointer in which case the
+/* socktype argument is ignored. On output from
+/* sockaddr_to_hostname/addr(), storage for the result service
+/* name, or a null pointer.
+/* .IP portnum
+/* Storage for the result service port number, or a null pointer.
+/* .IP socktype
+/* Socket type: SOCK_STREAM, SOCK_DGRAM, etc. This argument is
+/* ignored when no service or port are specified.
+/* .IP sa
+/* Protocol-independent socket address structure.
+/* .IP salen
+/* Protocol-dependent socket address structure size in bytes.
+/* SEE ALSO
+/* getaddrinfo(3), getnameinfo(3), freeaddrinfo(3), gai_strerror(3)
+/* DIAGNOSTICS
+/* All routines either return 0 upon success, or an error code
+/* that is compatible with gai_strerror().
+/*
+/* On systems where addrinfo support is emulated by Postfix,
+/* some out-of-memory errors are not reported to the caller,
+/* but are handled by mymalloc().
+/* BUGS
+/* The IPv4-only emulation code does not support requests that
+/* specify a service but no socket type. It returns an error
+/* indication, instead of enumerating all the possible answers.
+/*
+/* The hostname/addr_to_sockaddr() routines should accept a
+/* list of address families that the caller is interested in,
+/* and they should return only information of those types.
+/*
+/* Unfortunately, it is not possible to remove unwanted address
+/* family results from hostname_to_sockaddr(), because we
+/* don't know how the system library routine getaddrinfo()
+/* allocates memory. For example, getaddrinfo() could save
+/* space by referencing the same string object from multiple
+/* addrinfo structures; or it could allocate a string object
+/* and the addrinfo structure as one memory block.
+/*
+/* We could get around this by copying getaddrinfo() results
+/* to our own private data structures, but that would only
+/* make an already expensive API even more expensive.
+/*
+/* A better workaround is to return a vector of addrinfo
+/* pointers to the elements that contain only the elements
+/* that the caller is interested in. The pointer to the
+/* original getaddrinfo() result can be hidden at the end
+/* after the null terminator, or before the first element.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h> /* sprintf() */
+
+/* Utility library. */
+
+#include <mymalloc.h>
+#include <valid_hostname.h>
+#include <sock_addr.h>
+#include <stringops.h>
+#include <msg.h>
+#include <inet_proto.h>
+#include <myaddrinfo.h>
+#include <split_at.h>
+
+/* Application-specific. */
+
+ /*
+ * Use an old trick to save some space: allocate space for two objects in
+ * one. In Postfix we often use this trick for structures that have an array
+ * of things at the end.
+ */
+struct ipv4addrinfo {
+ struct addrinfo info;
+ struct sockaddr_in sin;
+};
+
+ /*
+ * When we're not interested in service ports, we must pick a socket type
+ * otherwise getaddrinfo() will give us duplicate results: one set for TCP,
+ * and another set for UDP. For consistency, we'll use the same default
+ * socket type for the results from emulation mode.
+ */
+#define MAI_SOCKTYPE SOCK_STREAM /* getaddrinfo() query */
+
+#ifdef EMULATE_IPV4_ADDRINFO
+
+/* clone_ipv4addrinfo - clone ipv4addrinfo structure */
+
+static struct ipv4addrinfo *clone_ipv4addrinfo(struct ipv4addrinfo * tp)
+{
+ struct ipv4addrinfo *ip;
+
+ ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip));
+ *ip = *tp;
+ ip->info.ai_addr = (struct sockaddr *) &(ip->sin);
+ return (ip);
+}
+
+/* init_ipv4addrinfo - initialize an ipv4addrinfo structure */
+
+static void init_ipv4addrinfo(struct ipv4addrinfo * ip, int socktype)
+{
+
+ /*
+ * Portability: null pointers aren't necessarily all-zero bits, so we
+ * make explicit assignments to all the pointers that we're aware of.
+ */
+ memset((void *) ip, 0, sizeof(*ip));
+ ip->info.ai_family = PF_INET;
+ ip->info.ai_socktype = socktype;
+ ip->info.ai_protocol = 0; /* XXX */
+ ip->info.ai_addrlen = sizeof(ip->sin);
+ ip->info.ai_canonname = 0;
+ ip->info.ai_addr = (struct sockaddr *) &(ip->sin);
+ ip->info.ai_next = 0;
+ ip->sin.sin_family = AF_INET;
+#ifdef HAS_SA_LEN
+ ip->sin.sin_len = sizeof(ip->sin);
+#endif
+}
+
+/* find_service - translate numeric or symbolic service name */
+
+static int find_service(const char *service, int socktype)
+{
+ struct servent *sp;
+ const char *proto;
+ unsigned port;
+
+ if (alldig(service)) {
+ port = atoi(service);
+ return (port < 65536 ? htons(port) : -1);
+ }
+ if (socktype == SOCK_STREAM) {
+ proto = "tcp";
+ } else if (socktype == SOCK_DGRAM) {
+ proto = "udp";
+ } else {
+ return (-1);
+ }
+ if ((sp = getservbyname(service, proto)) != 0) {
+ return (sp->s_port);
+ } else {
+ return (-1);
+ }
+}
+
+#endif
+
+/* hostname_to_sockaddr_pf - hostname to binary address form */
+
+int hostname_to_sockaddr_pf(const char *hostname, int pf,
+ const char *service, int socktype,
+ struct addrinfo ** res)
+{
+#ifdef EMULATE_IPV4_ADDRINFO
+
+ /*
+ * Emulated getaddrinfo(3) version.
+ */
+ static struct ipv4addrinfo template;
+ struct ipv4addrinfo *ip;
+ struct ipv4addrinfo *prev;
+ struct in_addr addr;
+ struct hostent *hp;
+ char **name_list;
+ int port;
+
+ /*
+ * Validate the service.
+ */
+ if (service) {
+ if ((port = find_service(service, socktype)) < 0)
+ return (EAI_SERVICE);
+ } else {
+ port = 0;
+ socktype = MAI_SOCKTYPE;
+ }
+
+ /*
+ * No host means INADDR_ANY.
+ */
+ if (hostname == 0) {
+ ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip));
+ init_ipv4addrinfo(ip, socktype);
+ ip->sin.sin_addr.s_addr = INADDR_ANY;
+ ip->sin.sin_port = port;
+ *res = &(ip->info);
+ return (0);
+ }
+
+ /*
+ * Numeric host.
+ */
+ if (inet_pton(AF_INET, hostname, (void *) &addr) == 1) {
+ ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip));
+ init_ipv4addrinfo(ip, socktype);
+ ip->sin.sin_addr = addr;
+ ip->sin.sin_port = port;
+ *res = &(ip->info);
+ return (0);
+ }
+
+ /*
+ * Look up the IPv4 address list.
+ */
+ if ((hp = gethostbyname(hostname)) == 0)
+ return (h_errno == TRY_AGAIN ? EAI_AGAIN : EAI_NODATA);
+ if (hp->h_addrtype != AF_INET
+ || hp->h_length != sizeof(template.sin.sin_addr))
+ return (EAI_NODATA);
+
+ /*
+ * Initialize the result template.
+ */
+ if (template.info.ai_addrlen == 0)
+ init_ipv4addrinfo(&template, socktype);
+
+ /*
+ * Copy the address information into an addrinfo structure.
+ */
+ prev = &template;
+ for (name_list = hp->h_addr_list; name_list[0]; name_list++) {
+ ip = clone_ipv4addrinfo(prev);
+ ip->sin.sin_addr = IN_ADDR(name_list[0]);
+ ip->sin.sin_port = port;
+ if (prev == &template)
+ *res = &(ip->info);
+ else
+ prev->info.ai_next = &(ip->info);
+ prev = ip;
+ }
+ return (0);
+#else
+
+ /*
+ * Native getaddrinfo(3) version.
+ *
+ * XXX Wild-card listener issues.
+ *
+ * With most IPv4 plus IPv6 systems, an IPv6 wild-card listener also listens
+ * on the IPv4 wild-card address. Connections from IPv4 clients appear as
+ * IPv4-in-IPv6 addresses; when Postfix support for IPv4 is turned on,
+ * Postfix automatically maps these embedded addresses to their original
+ * IPv4 form. So everything seems to be fine.
+ *
+ * However, some applications prefer to use separate listener sockets for
+ * IPv4 and IPv6. The Postfix IPv6 patch provided such an example. And
+ * this is where things become tricky. On many systems the IPv6 and IPv4
+ * wild-card listeners cannot coexist. When one is already active, the
+ * other fails with EADDRINUSE. Solaris 9, however, will automagically
+ * "do the right thing" and allow both listeners to coexist.
+ *
+ * Recent systems have the IPV6_V6ONLY feature (RFC 3493), which tells the
+ * system that we really mean IPv6 when we say IPv6. This allows us to
+ * set up separate wild-card listener sockets for IPv4 and IPv6. So
+ * everything seems to be fine again.
+ *
+ * The following workaround disables the wild-card IPv4 listener when
+ * IPV6_V6ONLY is unavailable. This is necessary for some Linux versions,
+ * but is not needed for Solaris 9 (which allows IPv4 and IPv6 wild-card
+ * listeners to coexist). Solaris 10 beta already has IPV6_V6ONLY.
+ *
+ * XXX This workaround obviously breaks if we want to support protocols in
+ * addition to IPv6 and IPv4, but it is needed only until IPv6
+ * implementations catch up with RFC 3493. A nicer fix is to filter the
+ * getaddrinfo() result, and to return a vector of addrinfo pointers to
+ * only those types of elements that the caller has expressed interested
+ * in.
+ *
+ * XXX Vanilla AIX 5.1 getaddrinfo() does not support a null hostname with
+ * AI_PASSIVE. And since we don't know how getaddrinfo() manages its
+ * memory we can't bypass it for this special case, or freeaddrinfo()
+ * might blow up. Instead we turn off IPV6_V6ONLY in inet_listen(), and
+ * supply a protocol-dependent hard-coded string value to getaddrinfo()
+ * below, so that it will convert into the appropriate wild-card address.
+ *
+ * XXX AIX 5.[1-3] getaddrinfo() may return a non-null port when a null
+ * service argument is specified.
+ */
+ struct addrinfo hints;
+ int err;
+
+ memset((void *) &hints, 0, sizeof(hints));
+ hints.ai_family = (pf != PF_UNSPEC) ? pf : inet_proto_info()->ai_family;
+ hints.ai_socktype = service ? socktype : MAI_SOCKTYPE;
+ if (!hostname) {
+ hints.ai_flags = AI_PASSIVE;
+#if !defined(IPV6_V6ONLY) || defined(BROKEN_AI_PASSIVE_NULL_HOST)
+ switch (hints.ai_family) {
+ case PF_UNSPEC:
+ hints.ai_family = PF_INET6;
+#ifdef BROKEN_AI_PASSIVE_NULL_HOST
+ case PF_INET6:
+ hostname = "::";
+ break;
+ case PF_INET:
+ hostname = "0.0.0.0";
+ break;
+#endif
+ }
+#endif
+ }
+ err = getaddrinfo(hostname, service, &hints, res);
+#if defined(BROKEN_AI_NULL_SERVICE)
+ if (service == 0 && err == 0) {
+ struct addrinfo *r;
+ unsigned short *portp;
+
+ for (r = *res; r != 0; r = r->ai_next)
+ if (*(portp = SOCK_ADDR_PORTP(r->ai_addr)) != 0)
+ *portp = 0;
+ }
+#endif
+ return (err);
+#endif
+}
+
+/* hostaddr_to_sockaddr - printable address to binary address form */
+
+int hostaddr_to_sockaddr(const char *hostaddr, const char *service,
+ int socktype, struct addrinfo ** res)
+{
+#ifdef EMULATE_IPV4_ADDRINFO
+
+ /*
+ * Emulated getaddrinfo(3) version.
+ */
+ struct ipv4addrinfo *ip;
+ struct in_addr addr;
+ int port;
+
+ /*
+ * Validate the service.
+ */
+ if (service) {
+ if ((port = find_service(service, socktype)) < 0)
+ return (EAI_SERVICE);
+ } else {
+ port = 0;
+ socktype = MAI_SOCKTYPE;
+ }
+
+ /*
+ * No host means INADDR_ANY.
+ */
+ if (hostaddr == 0) {
+ ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip));
+ init_ipv4addrinfo(ip, socktype);
+ ip->sin.sin_addr.s_addr = INADDR_ANY;
+ ip->sin.sin_port = port;
+ *res = &(ip->info);
+ return (0);
+ }
+
+ /*
+ * Deal with bad address forms.
+ */
+ switch (inet_pton(AF_INET, hostaddr, (void *) &addr)) {
+ case 1: /* Success */
+ break;
+ default: /* Unparsable */
+ return (EAI_NONAME);
+ case -1: /* See errno */
+ return (EAI_SYSTEM);
+ }
+
+ /*
+ * Initialize the result structure.
+ */
+ ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip));
+ init_ipv4addrinfo(ip, socktype);
+
+ /*
+ * And copy the result.
+ */
+ ip->sin.sin_addr = addr;
+ ip->sin.sin_port = port;
+ *res = &(ip->info);
+
+ return (0);
+#else
+
+ /*
+ * Native getaddrinfo(3) version. See comments in hostname_to_sockaddr().
+ *
+ * XXX Vanilla AIX 5.1 getaddrinfo() returns multiple results when
+ * converting a printable ipv4 or ipv6 address to socket address with
+ * ai_family=PF_UNSPEC, ai_flags=AI_NUMERICHOST, ai_socktype=SOCK_STREAM,
+ * ai_protocol=0 or IPPROTO_TCP, and service=0. The workaround is to
+ * ignore all but the first result.
+ *
+ * XXX AIX 5.[1-3] getaddrinfo() may return a non-null port when a null
+ * service argument is specified.
+ */
+ struct addrinfo hints;
+ int err;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = inet_proto_info()->ai_family;
+ hints.ai_socktype = service ? socktype : MAI_SOCKTYPE;
+ hints.ai_flags = AI_NUMERICHOST;
+ if (!hostaddr) {
+ hints.ai_flags |= AI_PASSIVE;
+#if !defined(IPV6_V6ONLY) || defined(BROKEN_AI_PASSIVE_NULL_HOST)
+ switch (hints.ai_family) {
+ case PF_UNSPEC:
+ hints.ai_family = PF_INET6;
+#ifdef BROKEN_AI_PASSIVE_NULL_HOST
+ case PF_INET6:
+ hostaddr = "::";
+ break;
+ case PF_INET:
+ hostaddr = "0.0.0.0";
+ break;
+#endif
+ }
+#endif
+ }
+ err = getaddrinfo(hostaddr, service, &hints, res);
+#if defined(BROKEN_AI_NULL_SERVICE)
+ if (service == 0 && err == 0) {
+ struct addrinfo *r;
+ unsigned short *portp;
+
+ for (r = *res; r != 0; r = r->ai_next)
+ if (*(portp = SOCK_ADDR_PORTP(r->ai_addr)) != 0)
+ *portp = 0;
+ }
+#endif
+ return (err);
+#endif
+}
+
+/* sockaddr_to_hostaddr - binary address to printable address form */
+
+int sockaddr_to_hostaddr(const struct sockaddr *sa, SOCKADDR_SIZE salen,
+ MAI_HOSTADDR_STR *hostaddr,
+ MAI_SERVPORT_STR *portnum,
+ int unused_socktype)
+{
+#ifdef EMULATE_IPV4_ADDRINFO
+ char portbuf[sizeof("65535")];
+ ssize_t len;
+
+ /*
+ * Emulated getnameinfo(3) version. The buffer length includes the space
+ * for the null terminator.
+ */
+ if (sa->sa_family != AF_INET) {
+ errno = EAFNOSUPPORT;
+ return (EAI_SYSTEM);
+ }
+ if (hostaddr != 0) {
+ if (inet_ntop(AF_INET, (void *) &(SOCK_ADDR_IN_ADDR(sa)),
+ hostaddr->buf, sizeof(hostaddr->buf)) == 0)
+ return (EAI_SYSTEM);
+ }
+ if (portnum != 0) {
+ sprintf(portbuf, "%d", ntohs(SOCK_ADDR_IN_PORT(sa)) & 0xffff);
+ if ((len = strlen(portbuf)) >= sizeof(portnum->buf)) {
+ errno = ENOSPC;
+ return (EAI_SYSTEM);
+ }
+ memcpy(portnum->buf, portbuf, len + 1);
+ }
+ return (0);
+#else
+ int ret;
+
+ /*
+ * Native getnameinfo(3) version.
+ */
+ ret = getnameinfo(sa, salen,
+ hostaddr ? hostaddr->buf : (char *) 0,
+ hostaddr ? sizeof(hostaddr->buf) : 0,
+ portnum ? portnum->buf : (char *) 0,
+ portnum ? sizeof(portnum->buf) : 0,
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ if (hostaddr != 0 && ret == 0 && sa->sa_family == AF_INET6)
+ (void) split_at(hostaddr->buf, '%');
+ return (ret);
+#endif
+}
+
+/* sockaddr_to_hostname - binary address to printable hostname */
+
+int sockaddr_to_hostname(const struct sockaddr *sa, SOCKADDR_SIZE salen,
+ MAI_HOSTNAME_STR *hostname,
+ MAI_SERVNAME_STR *service,
+ int socktype)
+{
+#ifdef EMULATE_IPV4_ADDRINFO
+
+ /*
+ * Emulated getnameinfo(3) version.
+ */
+ struct hostent *hp;
+ struct servent *sp;
+ size_t len;
+
+ /*
+ * Sanity check.
+ */
+ if (sa->sa_family != AF_INET)
+ return (EAI_NODATA);
+
+ /*
+ * Look up the host name.
+ */
+ if (hostname != 0) {
+ if ((hp = gethostbyaddr((char *) &(SOCK_ADDR_IN_ADDR(sa)),
+ sizeof(SOCK_ADDR_IN_ADDR(sa)),
+ AF_INET)) == 0)
+ return (h_errno == TRY_AGAIN ? EAI_AGAIN : EAI_NONAME);
+
+ /*
+ * Save the result. The buffer length includes the space for the null
+ * terminator. Hostname sanity checks are at the end of this
+ * function.
+ */
+ if ((len = strlen(hp->h_name)) >= sizeof(hostname->buf)) {
+ errno = ENOSPC;
+ return (EAI_SYSTEM);
+ }
+ memcpy(hostname->buf, hp->h_name, len + 1);
+ }
+
+ /*
+ * Look up the service.
+ */
+ if (service != 0) {
+ if ((sp = getservbyport(ntohs(SOCK_ADDR_IN_PORT(sa)),
+ socktype == SOCK_DGRAM ? "udp" : "tcp")) == 0)
+ return (EAI_NONAME);
+
+ /*
+ * Save the result. The buffer length includes the space for the null
+ * terminator.
+ */
+ if ((len = strlen(sp->s_name)) >= sizeof(service->buf)) {
+ errno = ENOSPC;
+ return (EAI_SYSTEM);
+ }
+ memcpy(service->buf, sp->s_name, len + 1);
+ }
+#else
+
+ /*
+ * Native getnameinfo(3) version.
+ */
+ int err;
+
+ err = getnameinfo(sa, salen,
+ hostname ? hostname->buf : (char *) 0,
+ hostname ? sizeof(hostname->buf) : 0,
+ service ? service->buf : (char *) 0,
+ service ? sizeof(service->buf) : 0,
+ socktype == SOCK_DGRAM ?
+ NI_NAMEREQD | NI_DGRAM : NI_NAMEREQD);
+ if (err != 0)
+ return (err);
+#endif
+
+ /*
+ * Hostname sanity checks.
+ */
+ if (hostname != 0) {
+ if (valid_hostaddr(hostname->buf, DONT_GRIPE)) {
+ msg_warn("numeric hostname: %s", hostname->buf);
+ return (EAI_NONAME);
+ }
+ if (!valid_hostname(hostname->buf, DO_GRIPE))
+ return (EAI_NONAME);
+ }
+ return (0);
+}
+
+/* myaddrinfo_control - fine control */
+
+void myaddrinfo_control(int name,...)
+{
+ const char *myname = "myaddrinfo_control";
+ va_list ap;
+
+ for (va_start(ap, name); name != 0; name = va_arg(ap, int)) {
+ switch (name) {
+ default:
+ msg_panic("%s: bad name %d", myname, name);
+ }
+ }
+ va_end(ap);
+}
+
+#ifdef EMULATE_IPV4_ADDRINFO
+
+/* freeaddrinfo - release storage */
+
+void freeaddrinfo(struct addrinfo * ai)
+{
+ struct addrinfo *ap;
+ struct addrinfo *next;
+
+ /*
+ * Artefact of implementation: tolerate a null pointer argument.
+ */
+ for (ap = ai; ap != 0; ap = next) {
+ next = ap->ai_next;
+ if (ap->ai_canonname)
+ myfree(ap->ai_canonname);
+ /* ap->ai_addr is allocated within this memory block */
+ myfree((void *) ap);
+ }
+}
+
+static char *ai_errlist[] = {
+ "Success",
+ "Address family for hostname not supported", /* EAI_ADDRFAMILY */
+ "Temporary failure in name resolution", /* EAI_AGAIN */
+ "Invalid value for ai_flags", /* EAI_BADFLAGS */
+ "Non-recoverable failure in name resolution", /* EAI_FAIL */
+ "ai_family not supported", /* EAI_FAMILY */
+ "Memory allocation failure", /* EAI_MEMORY */
+ "No address associated with hostname", /* EAI_NODATA */
+ "hostname nor servname provided, or not known", /* EAI_NONAME */
+ "service name not supported for ai_socktype", /* EAI_SERVICE */
+ "ai_socktype not supported", /* EAI_SOCKTYPE */
+ "System error returned in errno", /* EAI_SYSTEM */
+ "Invalid value for hints", /* EAI_BADHINTS */
+ "Resolved protocol is unknown", /* EAI_PROTOCOL */
+ "Unknown error", /* EAI_MAX */
+};
+
+/* gai_strerror - error number to string */
+
+char *gai_strerror(int ecode)
+{
+
+ /*
+ * Note: EAI_SYSTEM errors are not automatically handed over to
+ * strerror(). The application decides.
+ */
+ if (ecode < 0 || ecode > EAI_MAX)
+ ecode = EAI_MAX;
+ return (ai_errlist[ecode]);
+}
+
+#endif
+
+#ifdef TEST
+
+ /*
+ * A test program that takes some info from the command line and runs it
+ * forward and backward through the above conversion routines.
+ */
+#include <stdlib.h>
+#include <msg.h>
+#include <vstream.h>
+#include <msg_vstream.h>
+
+static int compare_family(const void *a, const void *b)
+{
+ struct addrinfo *resa = *(struct addrinfo **) a;
+ struct addrinfo *resb = *(struct addrinfo **) b;
+
+ return (resa->ai_family - resb->ai_family);
+}
+
+int main(int argc, char **argv)
+{
+ struct addrinfo *info;
+ struct addrinfo *ip;
+ struct addrinfo **resv;
+ MAI_HOSTNAME_STR host;
+ MAI_HOSTADDR_STR addr;
+ size_t len, n;
+ int err;
+
+ msg_vstream_init(argv[0], VSTREAM_ERR);
+
+ if (argc != 4)
+ msg_fatal("usage: %s protocols hostname hostaddress", argv[0]);
+
+ inet_proto_init(argv[0], argv[1]);
+
+ msg_info("=== hostname %s ===", argv[2]);
+
+ if ((err = hostname_to_sockaddr(argv[2], (char *) 0, 0, &info)) != 0) {
+ msg_info("hostname_to_sockaddr(%s): %s",
+ argv[2], err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err));
+ } else {
+ for (len = 0, ip = info; ip != 0; ip = ip->ai_next)
+ len += 1;
+ resv = (struct addrinfo **) mymalloc(len * sizeof(*resv));
+ for (len = 0, ip = info; ip != 0; ip = ip->ai_next)
+ resv[len++] = ip;
+ qsort((void *) resv, len, sizeof(*resv), compare_family);
+ for (n = 0; n < len; n++) {
+ ip = resv[n];
+ if ((err = sockaddr_to_hostaddr(ip->ai_addr, ip->ai_addrlen, &addr,
+ (MAI_SERVPORT_STR *) 0, 0)) != 0) {
+ msg_info("sockaddr_to_hostaddr: %s",
+ err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err));
+ continue;
+ }
+ msg_info("%s -> family=%d sock=%d proto=%d %s", argv[2],
+ ip->ai_family, ip->ai_socktype, ip->ai_protocol, addr.buf);
+ if ((err = sockaddr_to_hostname(ip->ai_addr, ip->ai_addrlen, &host,
+ (MAI_SERVNAME_STR *) 0, 0)) != 0) {
+ msg_info("sockaddr_to_hostname: %s",
+ err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err));
+ continue;
+ }
+ msg_info("%s -> %s", addr.buf, host.buf);
+ }
+ freeaddrinfo(info);
+ myfree((void *) resv);
+ }
+
+ msg_info("=== host address %s ===", argv[3]);
+
+ if ((err = hostaddr_to_sockaddr(argv[3], (char *) 0, 0, &ip)) != 0) {
+ msg_info("hostaddr_to_sockaddr(%s): %s",
+ argv[3], err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err));
+ } else {
+ if ((err = sockaddr_to_hostaddr(ip->ai_addr, ip->ai_addrlen, &addr,
+ (MAI_SERVPORT_STR *) 0, 0)) != 0) {
+ msg_info("sockaddr_to_hostaddr: %s",
+ err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err));
+ } else {
+ msg_info("%s -> family=%d sock=%d proto=%d %s", argv[3],
+ ip->ai_family, ip->ai_socktype, ip->ai_protocol, addr.buf);
+ if ((err = sockaddr_to_hostname(ip->ai_addr, ip->ai_addrlen, &host,
+ (MAI_SERVNAME_STR *) 0, 0)) != 0) {
+ msg_info("sockaddr_to_hostname: %s",
+ err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err));
+ } else
+ msg_info("%s -> %s", addr.buf, host.buf);
+ freeaddrinfo(ip);
+ }
+ }
+ exit(0);
+}
+
+#endif