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/* $OpenBSD: util.c,v 1.14 2023/12/21 12:43:31 martijn Exp $ */
/*
* Copyright (c) 2014 Bret Stephen Lambert <blambert@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <netdb.h>
#include "snmpd.h"
ssize_t
sendtofrom(int s, void *buf, size_t len, int flags, struct sockaddr *to,
socklen_t tolen, struct sockaddr *from, socklen_t fromlen)
{
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct in6_pktinfo *pkt6;
struct sockaddr_in *in;
struct sockaddr_in6 *in6;
union {
struct cmsghdr hdr;
char inbuf[CMSG_SPACE(sizeof(struct in_addr))];
char in6buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
} cmsgbuf;
bzero(&msg, sizeof(msg));
bzero(&cmsgbuf, sizeof(cmsgbuf));
iov.iov_base = buf;
iov.iov_len = len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_name = to;
msg.msg_namelen = tolen;
msg.msg_control = &cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf);
cmsg = CMSG_FIRSTHDR(&msg);
switch (to->sa_family) {
case AF_INET:
msg.msg_controllen = sizeof(cmsgbuf.inbuf);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
cmsg->cmsg_level = IPPROTO_IP;
cmsg->cmsg_type = IP_SENDSRCADDR;
in = (struct sockaddr_in *)from;
memcpy(CMSG_DATA(cmsg), &in->sin_addr, sizeof(struct in_addr));
break;
case AF_INET6:
msg.msg_controllen = sizeof(cmsgbuf.in6buf);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
in6 = (struct sockaddr_in6 *)from;
pkt6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
pkt6->ipi6_addr = in6->sin6_addr;
break;
}
return sendmsg(s, &msg, flags);
}
ssize_t
recvfromto(int s, void *buf, size_t len, int flags, struct sockaddr *from,
socklen_t *fromlen, struct sockaddr *to, socklen_t *tolen)
{
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct in6_pktinfo *pkt6;
struct sockaddr_in *in;
struct sockaddr_in6 *in6;
ssize_t ret;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(struct sockaddr_storage))];
} cmsgbuf;
bzero(&msg, sizeof(msg));
bzero(&cmsgbuf.buf, sizeof(cmsgbuf.buf));
iov.iov_base = buf;
iov.iov_len = len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_name = from;
msg.msg_namelen = *fromlen;
msg.msg_control = &cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
if ((ret = recvmsg(s, &msg, flags)) == -1)
return (-1);
*fromlen = from->sa_len;
*tolen = 0;
if (getsockname(s, to, tolen) != 0)
*tolen = 0;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
switch (from->sa_family) {
case AF_INET:
if (cmsg->cmsg_level == IPPROTO_IP &&
cmsg->cmsg_type == IP_RECVDSTADDR) {
in = (struct sockaddr_in *)to;
in->sin_family = AF_INET;
in->sin_len = *tolen = sizeof(*in);
memcpy(&in->sin_addr, CMSG_DATA(cmsg),
sizeof(struct in_addr));
}
break;
case AF_INET6:
if (cmsg->cmsg_level == IPPROTO_IPV6 &&
cmsg->cmsg_type == IPV6_PKTINFO) {
in6 = (struct sockaddr_in6 *)to;
in6->sin6_family = AF_INET6;
in6->sin6_len = *tolen = sizeof(*in6);
pkt6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
memcpy(&in6->sin6_addr, &pkt6->ipi6_addr,
sizeof(struct in6_addr));
if (IN6_IS_ADDR_LINKLOCAL(&in6->sin6_addr))
in6->sin6_scope_id =
pkt6->ipi6_ifindex;
}
break;
}
}
return (ret);
}
const char *
print_host(struct sockaddr_storage *ss, char *buf, size_t len)
{
if (getnameinfo((struct sockaddr *)ss, ss->ss_len,
buf, len, NULL, 0, NI_NUMERICHOST) != 0) {
buf[0] = '\0';
return (NULL);
}
return (buf);
}
char *
tohexstr(uint8_t *bstr, int len)
{
#define MAXHEXSTRLEN 256
static char hstr[2 * MAXHEXSTRLEN + 1];
static const char hex[] = "0123456789abcdef";
int i;
if (len > MAXHEXSTRLEN)
len = MAXHEXSTRLEN; /* truncate */
for (i = 0; i < len; i++) {
hstr[i + i] = hex[bstr[i] >> 4];
hstr[i + i + 1] = hex[bstr[i] & 0x0f];
}
hstr[i + i] = '\0';
return hstr;
}
uint8_t *
fromhexstr(uint8_t *bstr, const char *hstr, size_t len)
{
size_t i;
char hex[3];
if (len % 2 != 0)
return NULL;
hex[2] = '\0';
for (i = 0; i < len; i += 2) {
if (!isxdigit(hstr[i]) || !isxdigit(hstr[i + 1]))
return NULL;
hex[0] = hstr[i];
hex[1] = hstr[i + 1];
bstr[i / 2] = strtol(hex, NULL, 16);
}
return bstr;
}
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