[vlc-devel] [PATCH 21/41] Add missing getaddrinfo(), freeaddrinfo(), getnameinfo() and gai_strerror() for OS/2
KO Myung-Hun
komh at chollian.net
Mon Oct 10 13:44:00 CEST 2011
---
include/vlc_network.h | 33 +++++
src/network/getaddrinfo.c | 334 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 367 insertions(+), 0 deletions(-)
diff --git a/include/vlc_network.h b/include/vlc_network.h
index 5c9eeb5..b868c00 100644
--- a/include/vlc_network.h
+++ b/include/vlc_network.h
@@ -240,6 +240,39 @@ VLC_API int vlc_poll(struct pollfd *fds, unsigned nfds, int timeout);
#endif
#ifdef __OS2__
+# ifndef NI_NUMERICHOST
+# define NI_NUMERICHOST 0x01
+# define NI_NUMERICSERV 0x02
+# define NI_NOFQDN 0x04
+# define NI_NAMEREQD 0x08
+# define NI_DGRAM 0x10
+# endif
+
+# ifndef HAVE_STRUCT_ADDRINFO
+struct addrinfo
+{
+ int ai_flags;
+ int ai_family;
+ int ai_socktype;
+ int ai_protocol;
+ size_t ai_addrlen;
+ struct sockaddr *ai_addr;
+ char *ai_canonname;
+ struct addrinfo *ai_next;
+};
+# define AI_PASSIVE 1
+# define AI_CANONNAME 2
+# define AI_NUMERICHOST 4
+# endif /* if !HAVE_STRUCT_ADDRINFO */
+
+# ifndef HAVE_GAI_STRERROR
+VLC_API const char *gai_strerror( int errnum );
+# endif
+
+# ifndef HAVE_GETADDRINFO
+VLC_API void freeaddrinfo( struct addrinfo * );
+# endif
+
/* OS/2 does not support IPv6, yet. But declare these only for compilation */
struct in6_addr
{
diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c
index 6648f88..d67db96 100644
--- a/src/network/getaddrinfo.c
+++ b/src/network/getaddrinfo.c
@@ -42,6 +42,340 @@
# define AF_UNSPEC 0
#endif
+#ifdef __OS2__
+
+#ifndef HAVE_GAI_STRERROR
+static const struct
+{
+ int code;
+ const char msg[41];
+} gai_errlist[] =
+{
+ { 0, "Error 0" },
+ { EAI_BADFLAGS, "Invalid flag used" },
+ { EAI_NONAME, "Host or service not found" },
+ { EAI_AGAIN, "Temporary name service failure" },
+ { EAI_FAIL, "Non-recoverable name service failure" },
+ { EAI_NODATA, "No data for host name" },
+ { EAI_FAMILY, "Unsupported address family" },
+ { EAI_SOCKTYPE, "Unsupported socket type" },
+ { EAI_SERVICE, "Incompatible service for socket type" },
+ { EAI_ADDRFAMILY, "Unavailable address family for host name" },
+ { EAI_MEMORY, "Memory allocation failure" },
+ { EAI_OVERFLOW, "Buffer overflow" },
+ { EAI_SYSTEM, "System error" },
+ { 0, "" },
+};
+
+static const char gai_unknownerr[] = "Unrecognized error number";
+
+/****************************************************************************
+ * Converts an EAI_* error code into human readable english text.
+ ****************************************************************************/
+const char *gai_strerror (int errnum)
+{
+ for (unsigned i = 0; *gai_errlist[i].msg; i++)
+ if (errnum == gai_errlist[i].code)
+ return gai_errlist[i].msg;
+
+ return gai_unknownerr;
+}
+#endif /* !HAVE_GAI_STRERROR */
+
+#ifndef HAVE_GETNAMEINFO
+#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\
+ NI_DGRAM)
+/*
+ * getnameinfo() non-thread-safe IPv4-only implementation,
+ * Address-family-independent address to hostname translation
+ * (reverse DNS lookup in case of IPv4).
+ *
+ * This is meant for use on old IP-enabled systems that are not IPv6-aware,
+ * and probably do not have getnameinfo(), but have the old gethostbyaddr()
+ * function.
+ *
+ * OS/2 does not have this function.
+ */
+static int
+getnameinfo (const struct sockaddr *sa, socklen_t salen,
+ char *host, int hostlen, char *serv, int servlen, int flags)
+{
+ if (((size_t)salen < sizeof (struct sockaddr_in))
+ || (sa->sa_family != AF_INET))
+ return EAI_FAMILY;
+ else if (flags & (~_NI_MASK))
+ return EAI_BADFLAGS;
+ else
+ {
+ const struct sockaddr_in *addr;
+
+ addr = (const struct sockaddr_in *)sa;
+
+ if (host != NULL)
+ {
+ /* host name resolution */
+ if (!(flags & NI_NUMERICHOST))
+ {
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+ }
+
+ /* inet_ntoa() is not thread-safe, do not use it */
+ uint32_t ipv4 = ntohl (addr->sin_addr.s_addr);
+
+ if (snprintf (host, hostlen, "%u.%u.%u.%u", ipv4 >> 24,
+ (ipv4 >> 16) & 0xff, (ipv4 >> 8) & 0xff,
+ ipv4 & 0xff) >= (int)hostlen)
+ return EAI_OVERFLOW;
+ }
+
+ if (serv != NULL)
+ {
+ if (snprintf (serv, servlen, "%u",
+ (unsigned int)ntohs (addr->sin_port)) >= (int)servlen)
+ return EAI_OVERFLOW;
+ }
+ }
+ return 0;
+}
+#endif /* !HAVE_GETNAMEINFO */
+
+#ifndef HAVE_GETADDRINFO
+#define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
+/*
+ * Converts the current herrno error value into an EAI_* error code.
+ * That error code is normally returned by getnameinfo() or getaddrinfo().
+ */
+static int
+gai_error_from_herrno (void)
+{
+ switch (h_errno)
+ {
+ case HOST_NOT_FOUND:
+ return EAI_NONAME;
+
+ case NO_ADDRESS:
+# if (NO_ADDRESS != NO_DATA)
+ case NO_DATA:
+# endif
+ return EAI_NODATA;
+
+ case NO_RECOVERY:
+ return EAI_FAIL;
+
+ case TRY_AGAIN:
+ return EAI_AGAIN;
+ }
+ return EAI_SYSTEM;
+}
+
+/*
+ * This functions must be used to free the memory allocated by getaddrinfo().
+ */
+void freeaddrinfo (struct addrinfo *res)
+{
+ if (res == NULL)
+ return;
+ free (res->ai_canonname);
+ free (res->ai_addr);
+ free (res->ai_next);
+ free (res);
+}
+/*
+ * Internal function that builds an addrinfo struct.
+ */
+static struct addrinfo *
+makeaddrinfo (int af, int type, int proto,
+ const struct sockaddr *addr, size_t addrlen,
+ const char *canonname)
+{
+ struct addrinfo *res;
+
+ res = (struct addrinfo *)malloc (sizeof (struct addrinfo));
+ if (res != NULL)
+ {
+ res->ai_flags = 0;
+ res->ai_family = af;
+ res->ai_socktype = type;
+ res->ai_protocol = proto;
+ res->ai_addrlen = addrlen;
+ res->ai_addr = malloc (addrlen);
+ res->ai_canonname = NULL;
+ res->ai_next = NULL;
+
+ if (res->ai_addr != NULL)
+ {
+ memcpy (res->ai_addr, addr, addrlen);
+
+ if (canonname != NULL)
+ {
+ res->ai_canonname = strdup (canonname);
+ if (res->ai_canonname != NULL)
+ return res; /* success ! */
+ }
+ else
+ return res;
+ }
+ }
+ /* failsafe */
+ freeaddrinfo (res);
+ return NULL;
+}
+
+
+static struct addrinfo *
+makeipv4info (int type, int proto, u_long ip, u_short port, const char *name)
+{
+ struct sockaddr_in addr;
+
+ memset (&addr, 0, sizeof (addr));
+ addr.sin_family = AF_INET;
+# ifdef HAVE_SA_LEN
+ addr.sin_len = sizeof (addr);
+# endif
+ addr.sin_port = port;
+ addr.sin_addr.s_addr = ip;
+
+ return makeaddrinfo (AF_INET, type, proto,
+ (struct sockaddr*)&addr, sizeof (addr), name);
+}
+
+
+/*
+ * getaddrinfo() non-thread-safe IPv4-only implementation
+ * Address-family-independent hostname to address resolution.
+ *
+ * This is meant for IPv6-unaware systems that do probably not provide
+ * getaddrinfo(), but still have old function gethostbyname().
+ *
+ * Only UDP and TCP over IPv4 are supported here.
+ */
+static int
+getaddrinfo (const char *node, const char *service,
+ const struct addrinfo *hints, struct addrinfo **res)
+{
+ struct addrinfo *info;
+ u_long ip;
+ u_short port;
+ int protocol = 0, flags = 0;
+ const char *name = NULL;
+
+ if (hints != NULL)
+ {
+ flags = hints->ai_flags;
+
+ if (flags & ~_AI_MASK)
+ return EAI_BADFLAGS;
+ /* only accept AF_INET and AF_UNSPEC */
+ if (hints->ai_family && (hints->ai_family != AF_INET))
+ return EAI_FAMILY;
+
+ /* protocol sanity check */
+ switch (hints->ai_socktype)
+ {
+ case SOCK_STREAM:
+ protocol = IPPROTO_TCP;
+ break;
+
+ case SOCK_DGRAM:
+ protocol = IPPROTO_UDP;
+ break;
+
+#ifndef SOCK_RAW
+ case SOCK_RAW:
+#endif
+ case 0:
+ break;
+
+ default:
+ return EAI_SOCKTYPE;
+ }
+ if (hints->ai_protocol && protocol
+ && (protocol != hints->ai_protocol))
+ return EAI_SERVICE;
+ }
+
+ *res = NULL;
+
+ /* default values */
+ if (node == NULL)
+ {
+ if (flags & AI_PASSIVE)
+ ip = htonl (INADDR_ANY);
+ else
+ ip = htonl (INADDR_LOOPBACK);
+ }
+ else
+ if ((ip = inet_addr (node)) == INADDR_NONE)
+ {
+ struct hostent *entry = NULL;
+
+ /* hostname resolution */
+ if (!(flags & AI_NUMERICHOST))
+ entry = gethostbyname (node);
+
+ if (entry == NULL)
+ return gai_error_from_herrno ();
+
+ if ((entry->h_length != 4) || (entry->h_addrtype != AF_INET))
+ return EAI_FAMILY;
+
+ ip = *((u_long *) entry->h_addr);
+ if (flags & AI_CANONNAME)
+ name = entry->h_name;
+ }
+
+ if ((flags & AI_CANONNAME) && (name == NULL))
+ name = node;
+
+ /* service resolution */
+ if (service == NULL)
+ port = 0;
+ else
+ {
+ unsigned long d;
+ char *end;
+
+ d = strtoul (service, &end, 0);
+ if (end[0] || (d > 65535u))
+ return EAI_SERVICE;
+
+ port = htons ((u_short)d);
+ }
+
+ /* building results... */
+ if ((!protocol) || (protocol == IPPROTO_UDP))
+ {
+ info = makeipv4info (SOCK_DGRAM, IPPROTO_UDP, ip, port, name);
+ if (info == NULL)
+ {
+ errno = ENOMEM;
+ return EAI_SYSTEM;
+ }
+ if (flags & AI_PASSIVE)
+ info->ai_flags |= AI_PASSIVE;
+ *res = info;
+ }
+ if ((!protocol) || (protocol == IPPROTO_TCP))
+ {
+ info = makeipv4info (SOCK_STREAM, IPPROTO_TCP, ip, port, name);
+ if (info == NULL)
+ {
+ errno = ENOMEM;
+ return EAI_SYSTEM;
+ }
+ info->ai_next = *res;
+ if (flags & AI_PASSIVE)
+ info->ai_flags |= AI_PASSIVE;
+ *res = info;
+ }
+
+ return 0;
+}
+#endif /* !HAVE_GETADDRINFO */
+
+#endif /* __OS2__ */
+
int vlc_getnameinfo( const struct sockaddr *sa, int salen,
char *host, int hostlen, int *portnum, int flags )
{
--
1.7.3.2
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