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/* $Id: xio-ip6.c,v 1.20 2004/06/20 21:34:42 gerhard Exp $ */
/* Copyright Gerhard Rieger 2001-2004 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for IP6 related functions */
#include "xiosysincludes.h"
#include "xioopen.h"
#include "xio-socket.h"
#include "xio-ip6.h"
#if WITH_IP6
/* addr must be 0 terminated; withport tells if the number past the last colon
is expected to be a (TCP or UDP) port number */
int parseip6addr(char *addr, /* socket address, 0 terminated */
struct sockaddr_in6 *sa, /* must be initialized */
const char *protoname, /* "tcp" or "udp", for service */
int withaddr, /* 0: address allowed; 1: address required */
int withport /* -1: no port; 0: port allowed;
1: port required */
) {
char *a = addr;
int i = 0, j = -1, k;
unsigned short words[9]; /* last might be port */
int n;
#if !HAVE_GETADDRINFO
struct hostent *host;
#endif
char *colon, *ap=NULL;
while (*a) {
if (*a == ':') ++i;
++a;
}
a = addr;
if (i == 0) {
/* symbolic hostname, no port */
#if HAVE_GETADDRINFO
struct addrinfo hints;
struct addrinfo *res;
int error_num;
hints.ai_flags = 0;
hints.ai_family = AF_INET6;
if (!strcmp("tcp", protoname)) {
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
} else {
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
}
hints.ai_addrlen = 0;
hints.ai_addr = NULL;
hints.ai_canonname = NULL;
hints.ai_next = NULL;
if ((error_num = Getaddrinfo(addr, NULL, &hints, &res)) != 0) {
Error7("getaddrinfo(\"%s\", NULL, {%d,%d,%d,%d,"F_Zu",...}, {}): %s",
addr, hints.ai_flags, hints.ai_family, hints.ai_socktype,
hints.ai_protocol, hints.ai_addrlen, gai_strerror(error_num));
if (res != NULL) freeaddrinfo(res);
return STAT_RETRYLATER;
}
memcpy(sa, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
#elif HAVE_GETIPNODEBYNAME
/* first fallback is getipnodebyname() */
host = Getipnodebyname(addr, AF_INET6, AI_V4MAPPED, &error_num);
if (host == NULL) {
const static char ai_host_not_found = "Host not found";
const static char ai_no_address = "No address";
const static char ai_no_recovery = "No recovery";
const static char ai_try_again = "Try again";
char *error_msg = "Unknown error";
switch (error_num) {
case HOST_NOT_FOUND: error_msg = ai_host_not_found; break;
case NO_ADDRESS: error_msg = ai_no_address;
case NO_RECOVERY: error_msg = ai_no_recovery;
case TRY_AGAIN: error_msg = ai_try_again;
}
Error2("getipnodebyname(\"%s\", ...): %s", addr, error_msg);
} else {
memcpy(&sa->sin6_addr, host->h_addr_list[0], 16);
}
freehostent(host);
#else /* !HAVE_GETIPNODEBYNAME */
/* this is not a typical IP6 resolver function - but Linux
"man gethostbyname" says that the only supported address type with
this function is AF_INET _at present_, so maybe this fallback will
be useful somewhere sometimesin a future */
if ((host = Gethostbyname(addr)) == NULL) {
Error2("gethostbyname(\"%s\"): %s", addr,
h_errno == NETDB_INTERNAL ? strerror(errno) :
hstrerror(h_errno)/*0 h_messages[h_errno-1]*/);
return STAT_RETRYLATER;
}
if (host->h_addrtype != AF_INET6) {
Error1("parseip6addr(): \"%s\" does not resolve to IP6", addr);
} else {
memcpy(&sa->sin6_addr, host->h_addr_list[0], 16);
}
#endif /* !HAVE_GETADDRINFO */
} else if (i == 1) {
/* symbolic hostname, with port */
#if HAVE_GETADDRINFO
struct addrinfo hints;
struct addrinfo *res = NULL;
int error_num;
#endif /* HAVE_GETADDRINFO */
if (colon = strchr(addr, ':')) {
*colon = '\0';
}
#if HAVE_GETADDRINFO
hints.ai_flags = 0;
hints.ai_family = AF_INET6;
if (!strcmp("tcp", protoname)) {
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
} else {
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
}
hints.ai_addrlen = 0;
hints.ai_addr = NULL;
hints.ai_canonname = NULL;
hints.ai_next = NULL;
/* symbolic hostname, no port */
if ((error_num = Getaddrinfo(addr, ap, &hints, &res)) != 0) {
Error7("getaddrinfo(\"%s\", NULL, {%d,%d,%d,%d,"F_Zu",...}, {}): %s",
addr, hints.ai_flags, hints.ai_family, hints.ai_socktype,
hints.ai_protocol, hints.ai_addrlen, gai_strerror(error_num));
if (res != NULL) freeaddrinfo(res);
return STAT_RETRYLATER;
}
memcpy(sa, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
#elif HAVE_GETIPNODEBYNAME
/* first fallback is getipnodebyname() */
host = Getipnodebyname(addr, AF_INET6, AI_V4MAPPED, &error_num);
if (host == NULL) {
const static char ai_host_not_found = "Host not found";
const static char ai_no_address = "No address";
const static char ai_no_recovery = "No recovery";
const static char ai_try_again = "Try again";
char *error_msg = "Unknown error";
switch (error_num) {
case HOST_NOT_FOUND: error_msg = ai_host_not_found; break;
case NO_ADDRESS: error_msg = ai_no_address;
case NO_RECOVERY: error_msg = ai_no_recovery;
case TRY_AGAIN: error_msg = ai_try_again;
}
Error2("getipnodebyname(\"%s\", ...): %s", addr, error_msg);
} else {
memcpy(&sa->sin6_addr, host->h_addr_list[0], 16);
}
freehostent(host);
#else /* !HAVE_GETIPODEBYNAME */
/*! first fallback should be getipnodebyname() */
if ((host = Gethostbyname(addr)) == NULL) {
Error2("gethostbyname(\"%s\"): %s", addr,
h_errno == NETDB_INTERNAL ? strerror(errno) :
hstrerror(h_errno)/*0 h_messages[h_errno-1]*/);
return STAT_RETRYLATER;
}
if (host->h_addrtype != AF_INET6) {
Error1("parseip6addr(): \"%s\" does not resolve to IP6", addr);
} else {
memcpy(&sa->sin6_addr, host->h_addr_list[0], 16);
}
#endif /* !HAVE_GETADDRINFO */
if (colon) {
ap = colon + 1;
if (withport < 0) {
Error1("unexpected port specification \"%s\"", ap);
#if WITH_TCP || WITH_UDP
} else {
sa->sin6_port = parseport(ap, protoname);
#endif
}
}
} else {
/* numeric address specification */
if (i == 8 || withport == 1) {
n = i; /* hex words we get for address */
if ((ap = strrchr(a, ':')) == NULL) {
Error1("missing port specification in IP6 address \"%s\"", a);
return -1;
}
*ap++ = 0;
} else {
n = 8; /* we want all words for hex address */
ap = NULL;
}
i = 0;
while (i < n) {
if (*a == ':') {
if (*(a+1) == ':') { /* it is "::" */
if (j >= 0) { /* there was already a "::" */
addr = a;
Error("found second \"::\" in IP6 address");
return -1;
}
j = i;
if (i == 0) --n;
++a, --n;
}
++a;
} else if (isxdigit(*(unsigned char *)a)) {
words[i++] = strtoul(a, (char **)&a, 16);
} else if (!*a) {
break;
} else {
addr = a;
Error1("unsupported character '0%o' in IP6 address", *a);
return -1;
}
}
if (ap && withport) {
sa->sin6_port = htons(strtoul(ap, NULL, 0));
}
if (*a) {
Error1("extra characters \"%s\" in IP6 address", a);
return -1;
}
if (j < 0 && i < n) {
addr = a; /* too few words... */
Error("too few words in IP6 address");
return -1;
}
if (withport == 0 && i == 9) {
withport = 1;
}
#if 0
if (withport > 0) {
if (i == 0) {
Error("missing port specification in IP6 address");
return -1;
}
sa->sin6_port = htons(words[i-1]);
--i; n = 8;
}
#endif
for (k=0; k<j; ++k) {
#if HAVE_IP6_SOCKADDR==0
sa->sin6_addr.s6_addr[k<<1] = words[k]>>8;
sa->sin6_addr.s6_addr[(k<<1)+1] = words[k]&0xff;
#elif HAVE_IP6_SOCKADDR==1
sa->sin6_addr.u6_addr.u6_addr16[k] = htons(words[k]);
#elif HAVE_IP6_SOCKADDR==2
sa->sin6_addr.u6_addr16[k] = htons(words[k]);
#elif HAVE_IP6_SOCKADDR==3
sa->sin6_addr.in6_u.u6_addr16[k] = htons(words[k]);
#elif HAVE_IP6_SOCKADDR==4
sa->sin6_addr._S6_un._S6_u8[k<<1] = (words[k]>>8);
sa->sin6_addr._S6_un._S6_u8[(k<<1)+1] = (words[k]&0xff);
#elif HAVE_IP6_SOCKADDR==5
sa->sin6_addr.__u6_addr.__u6_addr16[k] = htons(words[k]);
#endif
}
for (; k<8-(i-j); ++k) {
#if HAVE_IP6_SOCKADDR==0
sa->sin6_addr.s6_addr[k<<1] = 0;
sa->sin6_addr.s6_addr[(k<<1)+1] = 0;
#elif HAVE_IP6_SOCKADDR==1
sa->sin6_addr.u6_addr.u6_addr16[k] = 0;
#elif HAVE_IP6_SOCKADDR==2
sa->sin6_addr.u6_addr16[k] = 0;
#elif HAVE_IP6_SOCKADDR==3
sa->sin6_addr.in6_u.u6_addr16[k] = 0;
#elif HAVE_IP6_SOCKADDR==4
sa->sin6_addr._S6_un._S6_u32[k] = 0;
#elif HAVE_IP6_SOCKADDR==5
sa->sin6_addr.__u6_addr.__u6_addr16[k] = 0;
#endif
}
for (; k<8; ++k) {
#if HAVE_IP6_SOCKADDR==0
sa->sin6_addr.s6_addr[k<<1] = words[k-(8-i)]>>8;
sa->sin6_addr.s6_addr[(k<<1)+1] = words[k-(8-i)]&0xff;
#elif HAVE_IP6_SOCKADDR==1
sa->sin6_addr.u6_addr.u6_addr16[k] = htons(words[k-(8-i)]);
#elif HAVE_IP6_SOCKADDR==2
sa->sin6_addr.u6_addr16[k] = htons(words[k-(8-i)]);
#elif HAVE_IP6_SOCKADDR==3
sa->sin6_addr.in6_u.u6_addr16[k] = htons(words[k-(8-i)]);
#elif HAVE_IP6_SOCKADDR==4
sa->sin6_addr._S6_un._S6_u8[k<<1] = (words[k-(8-i)]>>8);
sa->sin6_addr._S6_un._S6_u8[(k<<1)+1] = (words[k-(8-i)]&0xff);
#elif HAVE_IP6_SOCKADDR==5
sa->sin6_addr.__u6_addr.__u6_addr16[k] = htons(words[k-(8-i)]);
#endif
}
}
return 0;
}
#endif /* WITH_IP6 */
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