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using getaddrinfo/getnameinfo
- X-seq: zsh-workers 23465
- From: Clint Adams <clint@xxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: using getaddrinfo/getnameinfo
- Date: Wed, 23 May 2007 15:55:32 -0400
- Mail-followup-to: zsh-workers@xxxxxxxxxx
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
I'm not committing this, since I'm reasonably certain I forgot to finish
it.
glibc's nscd misbehaves with programs calling get*by*() functions, and
apparently this isn't going to be fixed since they've been deprecated
for ages and ages.
Index: configure.ac
===================================================================
RCS file: /cvsroot/zsh/zsh/configure.ac,v
retrieving revision 1.62
diff -u -r1.62 configure.ac
--- configure.ac 1 May 2007 22:05:03 -0000 1.62
+++ configure.ac 23 May 2007 19:11:06 -0000
@@ -1116,7 +1116,7 @@
waitpid wait3 \
sigaction sigblock sighold sigrelse sigsetmask sigprocmask \
killpg setpgid setpgrp tcsetpgrp tcgetattr nice \
- gethostname gethostbyname2 getipnodebyname \
+ gethostname getaddrinfo getnameinfo \
inet_aton inet_pton inet_ntop \
getlogin getpwent getpwnam getpwuid getgrgid getgrnam \
initgroups nis_list \
Index: Src/Modules/tcp.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Modules/tcp.c,v
retrieving revision 1.42
diff -u -r1.42 tcp.c
--- Src/Modules/tcp.c 13 Feb 2007 11:08:12 -0000 1.42
+++ Src/Modules/tcp.c 23 May 2007 19:11:08 -0000
@@ -135,79 +135,6 @@
/**/
#endif /* !HAVE_INET_PTON */
-/**/
-#ifndef HAVE_GETIPNODEBYNAME
-
-/**/
-# ifndef HAVE_GETHOSTBYNAME2
-
-/**/
-mod_export struct hostent *
-zsh_gethostbyname2(char const *name, int af)
-{
- if (af != AF_INET) {
- h_errno = NO_RECOVERY;
- return NULL;
- }
- return gethostbyname(name);
-}
-
-/**/
-#else /* !HAVE_GETHOSTBYNAME2 */
-
-/**/
-# define zsh_gethostbyname2 gethostbyname2
-
-/**/
-# endif /* !HAVE_GETHOSTBYNAME2 */
-
-/* note: this is not a complete implementation. If ignores the flags,
- and does not provide the memory allocation of the standard interface.
- Each returned structure will overwrite the previous one. */
-
-/**/
-mod_export struct hostent *
-zsh_getipnodebyname(char const *name, int af, UNUSED(int flags), int *errorp)
-{
- static struct hostent ahe;
- static char nbuf[16];
- static char *addrlist[] = { nbuf, NULL };
-# ifdef SUPPORT_IPV6
- static char pbuf[INET6_ADDRSTRLEN];
-# else
- static char pbuf[INET_ADDRSTRLEN];
-# endif
- struct hostent *he;
- if (zsh_inet_pton(af, name, nbuf) == 1) {
- zsh_inet_ntop(af, nbuf, pbuf, sizeof(pbuf));
- ahe.h_name = pbuf;
- ahe.h_aliases = addrlist+1;
- ahe.h_addrtype = af;
- ahe.h_length = (af == AF_INET) ? 4 : 16;
- ahe.h_addr_list = addrlist;
- return &ahe;
- }
- he = zsh_gethostbyname2(name, af);
- if (!he)
- *errorp = h_errno;
- return he;
-}
-
-/**/
-mod_export void
-freehostent(UNUSED(struct hostent *ptr))
-{
-}
-
-/**/
-#else /* !HAVE_GETIPNODEBYNAME */
-
-/**/
-# define zsh_getipnodebyname getipnodebyname
-
-/**/
-#endif /* !HAVE_GETIPNODEBYNAME */
-
LinkList ztcp_sessions;
/* "allocate" a tcp_session */
@@ -311,25 +238,23 @@
/**/
mod_export int
-tcp_connect(Tcp_session sess, char *addrp, struct hostent *zhost, int d_port)
+tcp_connect(Tcp_session sess, struct addrinfo *zai)
{
int salen;
#ifdef SUPPORT_IPV6
- if (zhost->h_addrtype==AF_INET6) {
- memcpy(&(sess->peer.in6.sin6_addr), addrp, zhost->h_length);
- sess->peer.in6.sin6_port = d_port;
+ if (zai->ai_family==AF_INET6) {
+ memcpy(&(sess->peer.in6.sin6_addr), zai->ai_addr, zai->ai_addrlen);
sess->peer.in6.sin6_flowinfo = 0;
# ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
sess->peer.in6.sin6_scope_id = 0;
# endif
- sess->peer.in6.sin6_family = zhost->h_addrtype;
+ sess->peer.in6.sin6_family = zai->ai_family;
salen = sizeof(struct sockaddr_in6);
} else
#endif /* SUPPORT_IPV6 */
{
- memcpy(&(sess->peer.in.sin_addr), addrp, zhost->h_length);
- sess->peer.in.sin_port = d_port;
- sess->peer.in.sin_family = zhost->h_addrtype;
+ memcpy(&(sess->peer.in.sin_addr), zai->ai_addr, zai->ai_addrlen);
+ sess->peer.in.sin_family = zai->ai_family;
salen = sizeof(struct sockaddr_in);
}
@@ -339,12 +264,13 @@
static int
bin_ztcp(char *nam, char **args, Options ops, UNUSED(int func))
{
- int herrno, err=1, destport, force=0, verbose=0, test=0, targetfd=0;
+ int err=1, destport, force=0, verbose=0, test=0, targetfd=0;
ZSOCKLEN_T len;
- char **addrp, *desthost, *localname, *remotename;
- struct hostent *zthost = NULL, *ztpeer = NULL;
+ char *desthost, *localname, *remotename;
+ char zthostname[1025], ztpeername[1025];
struct servent *srv;
Tcp_session sess = NULL;
+ struct addrinfo *zhostlist, *zai;
if (OPT_ISSET(ops,'f'))
force = 1;
@@ -561,16 +487,16 @@
if (sess->fd != -1)
{
- zthost = gethostbyaddr((const void *)&(sess->sock.in.sin_addr), sizeof(sess->sock.in.sin_addr), AF_INET);
- if (zthost)
- localname = zthost->h_name;
- else
+ if (getnameinfo((const struct sockaddr *)&(sess->sock.in.sin_addr), sizeof(struct sockaddr_in), zthostname, 1025, NULL, 0, 0))
localname = ztrdup(inet_ntoa(sess->sock.in.sin_addr));
- ztpeer = gethostbyaddr((const void *)&(sess->peer.in.sin_addr), sizeof(sess->peer.in.sin_addr), AF_INET);
- if (ztpeer)
- remotename = ztpeer->h_name;
else
+ localname = (char *)&zthostname;
+
+ if (getnameinfo((const struct sockaddr *)&(sess->peer.in.sin_addr), sizeof(struct sockaddr_in), ztpeername, 1025, NULL, 0, 0))
remotename = ztrdup(inet_ntoa(sess->peer.in.sin_addr));
+ else
+ remotename = (char *)&ztpeername;
+
if (OPT_ISSET(ops,'L')) {
int schar;
if (sess->flags & ZTCP_ZFTP)
@@ -602,20 +528,21 @@
destport = htons(23);
}
else {
+ struct addrinfo hints;
- srv = getservbyname(args[1],"tcp");
- if (srv)
- destport = srv->s_port;
- else
- destport = htons(atoi(args[1]));
- }
-
- desthost = ztrdup(args[0]);
-
- zthost = zsh_getipnodebyname(desthost, AF_INET, 0, &herrno);
- if (!zthost || errflag) {
- zwarnnam(nam, "host resolution failure: %s", desthost);
- return 1;
+ hints.ai_family = AF_INET;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = PF_INET;
+
+ desthost = ztrdup(args[0]);
+
+ if(getaddrinfo(desthost, args[1], &hints, &zhostlist)) {
+ zwarnnam(nam, "host resolution failure: %s", desthost);
+ return 1;
+ }
+ else {
+ destport = ntohs(((struct sockaddr_in *)(&zhostlist->ai_addr))->sin_port);
+ }
}
sess = tcp_socket(PF_INET, SOCK_STREAM, 0, 0);
@@ -637,11 +564,11 @@
return 1;
}
- for (addrp = zthost->h_addr_list; err && *addrp; addrp++) {
- if (zthost->h_length != 4)
+ for (zai = zhostlist; err && zai; zai = zai->ai_next) {
+ if (zai->ai_addrlen != 4)
zwarnnam(nam, "address length mismatch");
do {
- err = tcp_connect(sess, *addrp, zthost, destport);
+ err = tcp_connect(sess, zai);
} while (err && errno == EINTR && !errflag);
}
Index: Src/Modules/zftp.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Modules/zftp.c,v
retrieving revision 1.42
diff -u -r1.42 zftp.c
--- Src/Modules/zftp.c 10 May 2007 09:24:10 -0000 1.42
+++ Src/Modules/zftp.c 23 May 2007 19:11:12 -0000
@@ -1697,12 +1697,12 @@
{
struct protoent *zprotop;
struct servent *zservp;
- struct hostent *zhostp;
+ struct addrinfo *zai;
char **addrp, *fname, *tmpptr, *portnam = "ftp";
char *hostnam, *hostsuffix;
int err, tmout, port = -1;
ZSOCKLEN_T len;
- int herrno, af, hlen;
+ int af, hlen;
if (!*args) {
if (zfsess->userparams)
@@ -1806,21 +1806,20 @@
#endif
{
off_t tcp_port;
+ struct addrinfo hints, *hostlist;
+ int gai_err;
- zhostp = zsh_getipnodebyname(hostnam, af, 0, &herrno);
- if (!zhostp || errflag) {
- /* should use herror() here if available, but maybe
- * needs configure test. on AIX it's present but not
- * in headers.
- *
- * on the other hand, herror() is obsolete
- */
+ hints.ai_family = af;
+
+ gai_err = getaddrinfo(hostnam, NULL, &hints, &hostlist);
+
+ if (errflag || gai_err) {
FAILED();
- zwarnnam(name, "host not found: %s", hostnam);
+ zwarnnam(name, "host lookup failure: %s", gai_strerror(gai_err));
alarm(0);
return 1;
}
- zfsetparam("ZFTP_HOST", ztrdup(zhostp->h_name), ZFPM_READONLY);
+ zfsetparam("ZFTP_HOST", ztrdup(hostlist->ai_canonname), ZFPM_READONLY);
/* careful with pointer types */
#if defined(HAVE_NTOHS) && defined(HAVE_HTONS)
tcp_port = (off_t)ntohs((unsigned short)zservp->s_port);
@@ -1845,7 +1844,6 @@
tcp_close(zfsess->control);
zfsess->control = NULL;
}
- freehostent(zhostp);
zfunsetparam("ZFTP_HOST");
zfunsetparam("ZFTP_PORT");
FAILED();
@@ -1864,17 +1862,16 @@
err = 1;
/* try all possible IP's */
- for (addrp = zhostp->h_addr_list; err && *addrp; addrp++) {
- if(hlen != zhostp->h_length)
+ for (zai = hostlist; err && zai; zai = zai->ai_next) {
+ if(hlen != zai->ai_addrlen)
zwarnnam(name, "address length mismatch");
do {
- err = tcp_connect(zfsess->control, *addrp, zhostp, zservp->s_port);
+ err = tcp_connect(zfsess->control, zai);
} while (err && errno == EINTR && !errflag);
/* you can check whether it's worth retrying here */
}
if (err) {
- freehostent(zhostp);
zfclose(0);
FAILED();
zwarnnam(name, "connect failed: %e", errno);
@@ -1895,7 +1892,6 @@
zsh_inet_ntop(af, *addrp, pbuf, sizeof(pbuf));
zfsetparam("ZFTP_IP", ztrdup(pbuf), ZFPM_READONLY);
}
- freehostent(zhostp);
/* now we can talk to the control connection */
zcfinish = 0;
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