From b7c15c31519dc44c1f691e0466badd556ffe9423 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:18:56 +0200 Subject: Adding upstream version 3.7.10. Signed-off-by: Daniel Baumann --- src/dns/dns_rr_to_sa.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 src/dns/dns_rr_to_sa.c (limited to 'src/dns/dns_rr_to_sa.c') diff --git a/src/dns/dns_rr_to_sa.c b/src/dns/dns_rr_to_sa.c new file mode 100644 index 0000000..f264260 --- /dev/null +++ b/src/dns/dns_rr_to_sa.c @@ -0,0 +1,163 @@ +/*++ +/* NAME +/* dns_rr_to_sa 3 +/* SUMMARY +/* resource record to socket address +/* SYNOPSIS +/* #include +/* +/* int dns_rr_to_sa(rr, port, sa, sa_length) +/* DNS_RR *rr; +/* unsigned port; +/* struct sockaddr *sa; +/* SOCKADDR_SIZE *sa_length; +/* DESCRIPTION +/* dns_rr_to_sa() converts the address in a DNS resource record into +/* a socket address of the corresponding type. +/* +/* Arguments: +/* .IP rr +/* DNS resource record pointer. +/* .IP port +/* TCP or UDP port, network byte order. +/* .IP sa +/* Socket address pointer. +/* .IP sa_length +/* On input, the available socket address storage space. +/* On output, the amount of space actually used. +/* DIAGNOSTICS +/* The result is non-zero in case of problems, with the +/* error type returned via the errno variable. +/* 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 +/*--*/ + +/* System libraries. */ + +#include +#include + +/* Utility library. */ + +#include + +/* DNS library. */ + +#include + +/* dns_rr_to_sa - resource record to socket address */ + +int dns_rr_to_sa(DNS_RR *rr, unsigned port, struct sockaddr *sa, + SOCKADDR_SIZE *sa_length) +{ + SOCKADDR_SIZE sock_addr_len; + + if (rr->type == T_A) { + if (rr->data_len != sizeof(SOCK_ADDR_IN_ADDR(sa))) { + errno = EINVAL; + return (-1); + } else if ((sock_addr_len = sizeof(*SOCK_ADDR_IN_PTR(sa))) > *sa_length) { + errno = ENOSPC; + return (-1); + } else { + memset((void *) SOCK_ADDR_IN_PTR(sa), 0, sock_addr_len); + SOCK_ADDR_IN_FAMILY(sa) = AF_INET; + SOCK_ADDR_IN_PORT(sa) = port; + SOCK_ADDR_IN_ADDR(sa) = IN_ADDR(rr->data); +#ifdef HAS_SA_LEN + sa->sa_len = sock_addr_len; +#endif + *sa_length = sock_addr_len; + return (0); + } +#ifdef HAS_IPV6 + } else if (rr->type == T_AAAA) { + if (rr->data_len != sizeof(SOCK_ADDR_IN6_ADDR(sa))) { + errno = EINVAL; + return (-1); + } else if ((sock_addr_len = sizeof(*SOCK_ADDR_IN6_PTR(sa))) > *sa_length) { + errno = ENOSPC; + return (-1); + } else { + memset((void *) SOCK_ADDR_IN6_PTR(sa), 0, sock_addr_len); + SOCK_ADDR_IN6_FAMILY(sa) = AF_INET6; + SOCK_ADDR_IN6_PORT(sa) = port; + SOCK_ADDR_IN6_ADDR(sa) = IN6_ADDR(rr->data); +#ifdef HAS_SA_LEN + sa->sa_len = sock_addr_len; +#endif + *sa_length = sock_addr_len; + return (0); + } +#endif + } else { + errno = EAFNOSUPPORT; + return (-1); + } +} + + /* + * Stand-alone test program. + */ +#ifdef TEST +#include + +#include +#include +#include + +static const char *myname; + +static NORETURN usage(void) +{ + msg_fatal("usage: %s dnsaddrtype hostname portnumber", myname); +} + +int main(int argc, char **argv) +{ + DNS_RR *rr; + MAI_HOSTADDR_STR hostaddr; + MAI_SERVPORT_STR portnum; + struct sockaddr_storage ss; + struct sockaddr *sa = (struct sockaddr *) &ss; + SOCKADDR_SIZE sa_length = sizeof(ss); + VSTRING *why; + int type; + int port; + + myname = argv[0]; + if (argc < 4) + usage(); + why = vstring_alloc(1); + + while (*++argv) { + if (argv[1] == 0 || argv[2] == 0) + usage(); + if ((type = dns_type(argv[0])) == 0) + usage(); + if (!alldig(argv[2]) || (port = atoi(argv[2])) > 65535) + usage(); + if (dns_lookup(argv[1], type, 0, &rr, (VSTRING *) 0, why) != DNS_OK) + msg_fatal("%s: %s", argv[1], vstring_str(why)); + sa_length = sizeof(ss); + if (dns_rr_to_sa(rr, htons(port), sa, &sa_length) != 0) + msg_fatal("dns_rr_to_sa: %m"); + SOCKADDR_TO_HOSTADDR(sa, sa_length, &hostaddr, &portnum, 0); + vstream_printf("%s %s -> %s %s\n", + argv[1], argv[2], hostaddr.buf, portnum.buf); + vstream_fflush(VSTREAM_OUT); + argv += 2; + dns_rr_free(rr); + } + vstring_free(why); + return (0); +} + +#endif -- cgit v1.2.3