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Diffstat (limited to 'Modules/getnameinfo.c')
| -rw-r--r-- | Modules/getnameinfo.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/Modules/getnameinfo.c b/Modules/getnameinfo.c new file mode 100644 index 0000000..182a3bf --- /dev/null +++ b/Modules/getnameinfo.c @@ -0,0 +1,208 @@ +/* + * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Issues to be discussed: + * - Thread safe-ness must be checked + * - Return values. There seems to be no standard for return value (RFC2133) + * but INRIA implementation returns EAI_xxx defined for getaddrinfo(). + */ + +#if 0 +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> +#include <netdb.h> +#include <resolv.h> +#include <string.h> +#include <stddef.h> + +#include "addrinfo.h" +#endif + +#define SUCCESS 0 +#define YES 1 +#define NO 0 + +static struct gni_afd { + int a_af; + int a_addrlen; + int a_socklen; + int a_off; +} gni_afdl [] = { +#ifdef INET6 + {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), + offsetof(struct sockaddr_in6, sin6_addr)}, +#endif + {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), + offsetof(struct sockaddr_in, sin_addr)}, + {0, 0, 0}, +}; + +struct gni_sockinet { + u_char si_len; + u_char si_family; + u_short si_port; +}; + +#define ENI_NOSOCKET 0 +#define ENI_NOSERVNAME 1 +#define ENI_NOHOSTNAME 2 +#define ENI_MEMORY 3 +#define ENI_SYSTEM 4 +#define ENI_FAMILY 5 +#define ENI_SALEN 6 + +int +getnameinfo(sa, salen, host, hostlen, serv, servlen, flags) + const struct sockaddr *sa; + size_t salen; + char *host; + size_t hostlen; + char *serv; + size_t servlen; + int flags; +{ + struct gni_afd *gni_afd; + struct servent *sp; + struct hostent *hp; + u_short port; + int family, len, i; + char *addr, *p; + u_long v4a; + u_char pfx; + int h_error; + char numserv[512]; + char numaddr[512]; + + if (sa == NULL) + return ENI_NOSOCKET; + +#ifdef HAVE_SOCKADDR_SA_LEN + len = sa->sa_len; + if (len != salen) return ENI_SALEN; +#else + len = salen; +#endif + + family = sa->sa_family; + for (i = 0; gni_afdl[i].a_af; i++) + if (gni_afdl[i].a_af == family) { + gni_afd = &gni_afdl[i]; + goto found; + } + return ENI_FAMILY; + + found: + if (len != gni_afd->a_socklen) return ENI_SALEN; + + port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */ + addr = (char *)sa + gni_afd->a_off; + + if (serv == NULL || servlen == 0) { + /* what we should do? */ + } else if (flags & NI_NUMERICSERV) { + snprintf(numserv, sizeof(numserv), "%d", ntohs(port)); + if (strlen(numserv) > servlen) + return ENI_MEMORY; + strcpy(serv, numserv); + } else { + sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp"); + if (sp) { + if (strlen(sp->s_name) > servlen) + return ENI_MEMORY; + strcpy(serv, sp->s_name); + } else + return ENI_NOSERVNAME; + } + + switch (sa->sa_family) { + case AF_INET: + v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr; + if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a)) + flags |= NI_NUMERICHOST; + v4a >>= IN_CLASSA_NSHIFT; + if (v4a == 0 || v4a == IN_LOOPBACKNET) + flags |= NI_NUMERICHOST; + break; +#ifdef INET6 + case AF_INET6: + pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr8[0]; + if (pfx == 0 || pfx == 0xfe || pfx == 0xff) + flags |= NI_NUMERICHOST; + break; +#endif + } + if (host == NULL || hostlen == 0) { + /* what should we do? */ + } else if (flags & NI_NUMERICHOST) { + if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) + == NULL) + return ENI_SYSTEM; + if (strlen(numaddr) > hostlen) + return ENI_MEMORY; + strcpy(host, numaddr); + } else { +#ifdef INET6 + hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error); +#else + hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af); + h_error = h_errno; +#endif + + if (hp) { + if (flags & NI_NOFQDN) { + p = strchr(hp->h_name, '.'); + if (p) *p = '\0'; + } + if (strlen(hp->h_name) > hostlen) { +#ifdef INET6 + freehostent(hp); +#endif + return ENI_MEMORY; + } + strcpy(host, hp->h_name); +#ifdef INET6 + freehostent(hp); +#endif + } else { + if (flags & NI_NAMEREQD) + return ENI_NOHOSTNAME; + if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) + == NULL) + return ENI_NOHOSTNAME; + if (strlen(numaddr) > hostlen) + return ENI_MEMORY; + strcpy(host, numaddr); + } + } + return SUCCESS; +} |