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Diffstat (limited to 'src/util/myaddrinfo.h')
| -rw-r--r-- | src/util/myaddrinfo.h | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/util/myaddrinfo.h b/src/util/myaddrinfo.h new file mode 100644 index 0000000..94f1e9f --- /dev/null +++ b/src/util/myaddrinfo.h @@ -0,0 +1,229 @@ +#ifndef _MYADDRINFO_H_INCLUDED_ +#define _MYADDRINFO_H_INCLUDED_ + +/*++ +/* NAME +/* myaddrinfo 3h +/* SUMMARY +/* addrinfo encapsulation and emulation +/* SYNOPSIS +/* #include <myaddrinfo.h> +/* DESCRIPTION +/* .nf + + /* + * System library. + */ +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <netdb.h> +#include <string.h> +#include <errno.h> /* MAI_STRERROR() */ +#include <limits.h> /* CHAR_BIT */ + + /* + * Backwards compatibility support for IPV4 systems without addrinfo API. + */ +#ifdef EMULATE_IPV4_ADDRINFO + + /* + * Avoid clashes with global symbols, just in case some third-party library + * provides its own addrinfo() implementation. This also allows us to test + * the IPV4 emulation code on an IPV6 enabled system. + */ +#undef freeaddrinfo +#define freeaddrinfo mai_freeaddrinfo +#undef gai_strerror +#define gai_strerror mai_strerror +#undef addrinfo +#define addrinfo mai_addrinfo +#undef sockaddr_storage +#define sockaddr_storage mai_sockaddr_storage + + /* + * Modern systems define this in <netdb.h>. + */ +struct addrinfo { + int ai_flags; /* AI_PASSIVE|CANONNAME|NUMERICHOST */ + int ai_family; /* PF_xxx */ + int ai_socktype; /* SOCK_xxx */ + int ai_protocol; /* 0 or IPPROTO_xxx */ + size_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 */ +}; + + /* + * Modern systems define this in <sys/socket.h>. + */ +struct sockaddr_storage { + struct sockaddr_in dummy; /* alignment!! */ +}; + + /* + * Result codes. See gai_strerror() for text. Undefine already imported + * definitions so that we can test the IPv4-only emulation on a modern + * system without getting a ton of compiler warnings. + */ +#undef EAI_ADDRFAMILY +#define EAI_ADDRFAMILY 1 +#undef EAI_AGAIN +#define EAI_AGAIN 2 +#undef EAI_BADFLAGS +#define EAI_BADFLAGS 3 +#undef EAI_FAIL +#define EAI_FAIL 4 +#undef EAI_FAMILY +#define EAI_FAMILY 5 +#undef EAI_MEMORY +#define EAI_MEMORY 6 +#undef EAI_NODATA +#define EAI_NODATA 7 +#undef EAI_NONAME +#define EAI_NONAME 8 +#undef EAI_SERVICE +#define EAI_SERVICE 9 +#undef EAI_SOCKTYPE +#define EAI_SOCKTYPE 10 +#undef EAI_SYSTEM +#define EAI_SYSTEM 11 +#undef EAI_BADHINTS +#define EAI_BADHINTS 12 +#undef EAI_PROTOCOL +#define EAI_PROTOCOL 13 +#undef EAI_RESNULL +#define EAI_RESNULL 14 +#undef EAI_MAX +#define EAI_MAX 15 + +extern void freeaddrinfo(struct addrinfo *); +extern char *gai_strerror(int); + +#endif + + /* + * Bounds grow in leaps. These macros attempt to keep non-library code free + * from IPV6 #ifdef pollution. Avoid macro names that end in STRLEN because + * they suggest that space for the null terminator is not included. + */ +#ifdef HAS_IPV6 +# define MAI_HOSTADDR_STRSIZE INET6_ADDRSTRLEN +#else +# ifndef INET_ADDRSTRLEN +# define INET_ADDRSTRLEN 16 +# endif +# define MAI_HOSTADDR_STRSIZE INET_ADDRSTRLEN +#endif + +#define MAI_HOSTNAME_STRSIZE 1025 +#define MAI_SERVNAME_STRSIZE 32 +#define MAI_SERVPORT_STRSIZE sizeof("65535") + +#define MAI_V4ADDR_BITS 32 +#define MAI_V6ADDR_BITS 128 +#define MAI_V4ADDR_BYTES ((MAI_V4ADDR_BITS + (CHAR_BIT - 1))/CHAR_BIT) +#define MAI_V6ADDR_BYTES ((MAI_V6ADDR_BITS + (CHAR_BIT - 1))/CHAR_BIT) + + /* + * Routines and data structures to hide some of the complexity of the + * addrinfo API. They still don't hide that we may get results for address + * families that we aren't interested in. + * + * Note: the getnameinfo() and inet_ntop() system library functions use unsafe + * APIs with separate pointer and length arguments. To avoid buffer overflow + * problems with these functions, Postfix uses pointers to structures + * internally. This way the compiler can enforce that callers provide + * buffers with the appropriate length, instead of having to trust that + * callers will never mess up some length calculation. + */ +typedef struct { + char buf[MAI_HOSTNAME_STRSIZE]; +} MAI_HOSTNAME_STR; + +typedef struct { + char buf[MAI_HOSTADDR_STRSIZE]; +} MAI_HOSTADDR_STR; + +typedef struct { + char buf[MAI_SERVNAME_STRSIZE]; +} MAI_SERVNAME_STR; + +typedef struct { + char buf[MAI_SERVPORT_STRSIZE]; +} MAI_SERVPORT_STR; + +extern int WARN_UNUSED_RESULT hostname_to_sockaddr_pf(const char *, + int, const char *, int, struct addrinfo **); +extern int WARN_UNUSED_RESULT hostaddr_to_sockaddr(const char *, + const char *, int, struct addrinfo **); +extern int WARN_UNUSED_RESULT sockaddr_to_hostaddr(const struct sockaddr *, + SOCKADDR_SIZE, MAI_HOSTADDR_STR *, MAI_SERVPORT_STR *, int); +extern int WARN_UNUSED_RESULT sockaddr_to_hostname(const struct sockaddr *, + SOCKADDR_SIZE, MAI_HOSTNAME_STR *, MAI_SERVNAME_STR *, int); +extern void myaddrinfo_control(int,...); + +#define MAI_CTL_END 0 /* list terminator */ + +#define MAI_STRERROR(e) ((e) == EAI_SYSTEM ? strerror(errno) : gai_strerror(e)) + +#define hostname_to_sockaddr(host, serv, sock, res) \ + hostname_to_sockaddr_pf((host), PF_UNSPEC, (serv), (sock), (res)) + + /* + * Macros for the case where we really don't want to be bothered with things + * that may fail. + */ +#define HOSTNAME_TO_SOCKADDR_PF(host, pf, serv, sock, res) \ + do { \ + int _aierr; \ + _aierr = hostname_to_sockaddr_pf((host), (pf), (serv), (sock), (res)); \ + if (_aierr) \ + msg_fatal("hostname_to_sockaddr_pf: %s", MAI_STRERROR(_aierr)); \ + } while (0) + +#define HOSTNAME_TO_SOCKADDR(host, serv, sock, res) \ + HOSTNAME_TO_SOCKADDR_PF((host), PF_UNSPEC, (serv), (sock), (res)) + +#define HOSTADDR_TO_SOCKADDR(host, serv, sock, res) \ + do { \ + int _aierr; \ + _aierr = hostaddr_to_sockaddr((host), (serv), (sock), (res)); \ + if (_aierr) \ + msg_fatal("hostaddr_to_sockaddr: %s", MAI_STRERROR(_aierr)); \ + } while (0) + +#define SOCKADDR_TO_HOSTADDR(sa, salen, host, port, sock) \ + do { \ + int _aierr; \ + _aierr = sockaddr_to_hostaddr((sa), (salen), (host), (port), (sock)); \ + if (_aierr) \ + msg_fatal("sockaddr_to_hostaddr: %s", MAI_STRERROR(_aierr)); \ + } while (0) + +#define SOCKADDR_TO_HOSTNAME(sa, salen, host, service, sock) \ + do { \ + int _aierr; \ + _aierr = sockaddr_to_hostname((sa), (salen), (host), (service), (sock)); \ + if (_aierr) \ + msg_fatal("sockaddr_to_hostname: %s", MAI_STRERROR(_aierr)); \ + } while (0) + +/* 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 +/* +/* Wietse Venema +/* Google, Inc. +/* 111 8th Avenue +/* New York, NY 10011, USA +/*--*/ + +#endif |