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-rw-r--r--include/compat/getaddrinfo.h83
1 files changed, 83 insertions, 0 deletions
diff --git a/include/compat/getaddrinfo.h b/include/compat/getaddrinfo.h
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+++ b/include/compat/getaddrinfo.h
@@ -0,0 +1,83 @@
+/*
+ * Replacement implementation of getaddrinfo.
+ *
+ * This is an implementation of the getaddrinfo family of functions for
+ * systems that lack it, so that code can use getaddrinfo always. It provides
+ * IPv4 support only; for IPv6 support, a native getaddrinfo implemenation is
+ * required.
+ *
+ * The canonical version of this file is maintained in the rra-c-util package,
+ * which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
+ *
+ * Written by Russ Allbery <rra@stanford.edu>
+ *
+ * The authors hereby relinquish any claim to any copyright that they may have
+ * in this work, whether granted under contract or by operation of law or
+ * international treaty, and hereby commit to the public, at large, that they
+ * shall not, at any time in the future, seek to enforce any copyright in this
+ * work against any person or entity, or prevent any person or entity from
+ * copying, publishing, distributing or creating derivative works of this
+ * work.
+ */
+
+#ifndef COMPAT_GETADDRINFO_H
+#define COMPAT_GETADDRINFO_H
+
+#include <config.h>
+
+/* Skip this entire file if a system getaddrinfo was detected. */
+#ifndef HAVE_GETADDRINFO
+
+/* OpenBSD likes to have sys/types.h included before sys/socket.h. */
+#include <sys/types.h>
+#include <sys/socket.h>
+
+/* The struct returned by getaddrinfo, from RFC 3493. */
+struct addrinfo {
+ int ai_flags; /* AI_PASSIVE, AI_CANONNAME, .. */
+ int ai_family; /* AF_xxx */
+ int ai_socktype; /* SOCK_xxx */
+ int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
+ socklen_t ai_addrlen; /* Length of ai_addr */
+ char *ai_canonname; /* Canonical name for nodename */
+ struct sockaddr *ai_addr; /* Binary address */
+ struct addrinfo *ai_next; /* Next structure in linked list */
+};
+
+/* Constants for ai_flags from RFC 3493, combined with binary or. */
+#define AI_PASSIVE 0x0001
+#define AI_CANONNAME 0x0002
+#define AI_NUMERICHOST 0x0004
+#define AI_NUMERICSERV 0x0008
+#define AI_V4MAPPED 0x0010
+#define AI_ALL 0x0020
+#define AI_ADDRCONFIG 0x0040
+
+/* Error return codes from RFC 3493. */
+#define EAI_AGAIN 1 /* Temporary name resolution failure */
+#define EAI_BADFLAGS 2 /* Invalid value in ai_flags parameter */
+#define EAI_FAIL 3 /* Permanent name resolution failure */
+#define EAI_FAMILY 4 /* Address family not recognized */
+#define EAI_MEMORY 5 /* Memory allocation failure */
+#define EAI_NONAME 6 /* nodename or servname unknown */
+#define EAI_SERVICE 7 /* Service not recognized for socket type */
+#define EAI_SOCKTYPE 8 /* Socket type not recognized */
+#define EAI_SYSTEM 9 /* System error occurred, see errno */
+#define EAI_OVERFLOW 10 /* An argument buffer overflowed */
+
+/* Function prototypes. */
+__dso_public int sudo_getaddrinfo(const char *nodename, const char *servname,
+ const struct addrinfo *hints, struct addrinfo **res);
+__dso_public void sudo_freeaddrinfo(struct addrinfo *ai);
+__dso_public const char *sudo_gai_strerror(int ecode);
+
+/* Map sudo_* to RFC 3493 names. */
+#undef getaddrinfo
+#define getaddrinfo(_a, _b, _c, _d) sudo_getaddrinfo((_a), (_b), (_c), (_d))
+#undef freeaddrinfo
+#define freeaddrinfo(_a) sudo_freeaddrinfo((_a))
+#undef gai_strerror
+#define gai_strerror(_a) sudo_gai_strerror((_a))
+
+#endif /* !HAVE_GETADDRINFO */
+#endif /* COMPAT_GETADDRINFO_H */