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Code Issues Releases Activity

Introduce libxo support to arp(8)

Browse Source 
Reviewed by:	wblock, gnn, allanjude, phil
Approved by:	allanjude
MFC after:	1 week
Sponsored by:	Rubicon Communications (Netgate)
Differential Revision:	https://reviews.freebsd.org/D9563
This commit is contained in:
Renato Botelho 2017-04-06 22:50:28 +00:00
parent 9b6f7440b5
commit a2ac74c148
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=316592
3 changed files with 102 additions and 53 deletions
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2
usr.sbin/arp/Makefile
View File

@ -4,6 +4,8 @@
PROG= arp
MAN= arp.4 arp.8
LIBADD= xo
WARNS?= 3
.include <bsd.prog.mk>

13
usr.sbin/arp/arp.8
View File

@ -28,7 +28,7 @@
.\" @(#)arp.8 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd January 31, 2013
.Dd April 6, 2017
.Dt ARP 8
.Os
.Sh NAME
@ -36,10 +36,12 @@
.Nd address resolution display and control
.Sh SYNOPSIS
.Nm
.Op Fl -libxo Ar options
.Op Fl n
.Op Fl i Ar interface
.Ar hostname
.Nm
.Op Fl -libxo Ar options
.Op Fl n
.Op Fl i Ar interface
.Fl a
@ -77,6 +79,13 @@ using Internet dot notation.
.Pp
Available options:
.Bl -tag -width indent
.It Fl -libxo
Generate output via
.Xr libxo 3
in a selection of different human and machine readable formats.
See
.Xr xo_parse_args 3
for details on command line arguments.
.It Fl a
The program displays or deletes all of the current
.Tn ARP
@ -182,6 +191,8 @@ character will mark the rest of the line as a comment.
.El
.Sh SEE ALSO
.Xr inet 3 ,
.Xr libxo 3 ,
.Xr xo_parse_args 3 ,
.Xr arp 4 ,
.Xr ifconfig 8 ,
.Xr ndp 8

140
usr.sbin/arp/arp.c
View File

@ -78,6 +78,7 @@ __FBSDID("$FreeBSD$");
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <libxo/xo.h>
typedef void (action_fn)(struct sockaddr_dl *sdl, struct sockaddr_in *s_in,
struct rt_msghdr *rtm);
@ -114,6 +115,8 @@ struct if_nameindex *ifnameindex;
#define SETFUNC(f) { if (func) usage(); func = (f); }
#define ARP_XO_VERSION "1"
int
main(int argc, char *argv[])
{
@ -121,6 +124,10 @@ main(int argc, char *argv[])
int rtn = 0;
int aflag = 0; /* do it for all entries */
argc = xo_parse_args(argc, argv);
if (argc < 0)
exit(1);
while ((ch = getopt(argc, argv, "andfsSi:")) != -1)
switch(ch) {
case 'a':
@ -155,12 +162,13 @@ main(int argc, char *argv[])
func = F_GET;
if (rifname) {
if (func != F_GET && !(func == F_DELETE && aflag))
errx(1, "-i not applicable to this operation");
xo_errx(1, "-i not applicable to this operation");
if (if_nametoindex(rifname) == 0) {
if (errno == ENXIO)
errx(1, "interface %s does not exist", rifname);
xo_errx(1, "interface %s does not exist",
rifname);
else
err(1, "if_nametoindex(%s)", rifname);
xo_err(1, "if_nametoindex(%s)", rifname);
}
}
switch (func) {
@ -168,7 +176,16 @@ main(int argc, char *argv[])
if (aflag) {
if (argc != 0)
usage();
xo_set_version(ARP_XO_VERSION);
xo_open_container("arp");
xo_open_list("arp-cache");
search(0, print_entry);
xo_close_list("arp-cache");
xo_close_container("arp");
xo_finish();
} else {
if (argc != 1)
usage();
@ -218,7 +235,7 @@ file(char *name)
char line[100], arg[5][50], *args[5], *p;
if ((fp = fopen(name, "r")) == NULL)
err(1, "cannot open %s", name);
xo_err(1, "cannot open %s", name);
args[0] = &arg[0][0];
args[1] = &arg[1][0];
args[2] = &arg[2][0];
@ -234,7 +251,7 @@ file(char *name)
i = sscanf(p, "%49s %49s %49s %49s %49s", arg[0], arg[1],
arg[2], arg[3], arg[4]);
if (i < 2) {
warnx("bad line: %s", line);
xo_warnx("bad line: %s", line);
retval = 1;
continue;
}
@ -262,7 +279,7 @@ getaddr(char *host)
reply.sin_addr.s_addr = inet_addr(host);
if (reply.sin_addr.s_addr == INADDR_NONE) {
if (!(hp = gethostbyname(host))) {
warnx("%s: %s", host, hstrerror(h_errno));
xo_warnx("%s: %s", host, hstrerror(h_errno));
return (NULL);
}
bcopy((char *)hp->h_addr, (char *)&reply.sin_addr,
@ -327,7 +344,7 @@ set(int argc, char **argv)
clock_gettime(CLOCK_MONOTONIC, &tp);
if (sysctlbyname("net.link.ether.inet.max_age",
&max_age, &len, NULL, 0) != 0)
err(1, "sysctlbyname");
xo_err(1, "sysctlbyname");
expire_time = tp.tv_sec + max_age;
} else if (strcmp(argv[0], "pub") == 0) {
flags |= RTF_ANNOUNCE;
@ -343,18 +360,18 @@ set(int argc, char **argv)
}
} else if (strcmp(argv[0], "blackhole") == 0) {
if (flags & RTF_REJECT) {
errx(1, "Choose one of blackhole or reject, "
xo_errx(1, "Choose one of blackhole or reject, "
"not both.");
}
flags |= RTF_BLACKHOLE;
} else if (strcmp(argv[0], "reject") == 0) {
if (flags & RTF_BLACKHOLE) {
errx(1, "Choose one of blackhole or reject, "
xo_errx(1, "Choose one of blackhole or reject, "
"not both.");
}
flags |= RTF_REJECT;
} else {
warnx("Invalid parameter '%s'", argv[0]);
xo_warnx("Invalid parameter '%s'", argv[0]);
usage();
}
argv++;
@ -362,7 +379,7 @@ set(int argc, char **argv)
ea = (struct ether_addr *)LLADDR(&sdl_m);
if (doing_proxy && !strcmp(eaddr, "auto")) {
if (!get_ether_addr(dst->sin_addr.s_addr, ea)) {
warnx("no interface found for %s",
xo_warnx("no interface found for %s",
inet_ntoa(dst->sin_addr));
return (1);
}
@ -371,7 +388,7 @@ set(int argc, char **argv)
struct ether_addr *ea1 = ether_aton(eaddr);
if (ea1 == NULL) {
warnx("invalid Ethernet address '%s'", eaddr);
xo_warnx("invalid Ethernet address '%s'", eaddr);
return (1);
} else {
*ea = *ea1;
@ -389,7 +406,7 @@ set(int argc, char **argv)
*/
rtm = rtmsg(RTM_GET, dst, &sdl_m);
if (rtm == NULL) {
warn("%s", host);
xo_warn("%s", host);
return (1);
}
addr = (struct sockaddr_in *)(rtm + 1);
@ -398,7 +415,7 @@ set(int argc, char **argv)
if ((sdl->sdl_family != AF_LINK) ||
(rtm->rtm_flags & RTF_GATEWAY) ||
!valid_type(sdl->sdl_type)) {
warnx("cannot intuit interface index and type for %s", host);
xo_warnx("cannot intuit interface index and type for %s", host);
return (1);
}
sdl_m.sdl_type = sdl->sdl_type;
@ -413,19 +430,31 @@ static int
get(char *host)
{
struct sockaddr_in *addr;
int found;
addr = getaddr(host);
if (addr == NULL)
return (1);
if (0 == search(addr->sin_addr.s_addr, print_entry)) {
printf("%s (%s) -- no entry",
xo_set_version(ARP_XO_VERSION);
xo_open_container("arp");
xo_open_list("arp-cache");
found = search(addr->sin_addr.s_addr, print_entry);
if (found == 0) {
xo_emit("{d:hostname/%s} ({d:ip-address/%s}) -- no entry",
host, inet_ntoa(addr->sin_addr));
if (rifname)
printf(" on %s", rifname);
printf("\n");
return (1);
xo_emit(" on {d:interface/%s}", rifname);
xo_emit("\n");
}
return (0);
xo_close_list("arp-cache");
xo_close_container("arp");
xo_finish();
return (found == 0);
}
/*
@ -460,7 +489,7 @@ delete(char *host)
for (;;) { /* try twice */
rtm = rtmsg(RTM_GET, dst, &sdl_m);
if (rtm == NULL) {
warn("%s", host);
xo_warn("%s", host);
return (1);
}
addr = (struct sockaddr_in *)(rtm + 1);
@ -486,7 +515,7 @@ delete(char *host)
* is a proxy-arp entry to remove.
*/
if (flags & RTF_ANNOUNCE) {
warnx("delete: cannot locate %s", host);
xo_warnx("delete: cannot locate %s", host);
return (1);
}
@ -527,21 +556,21 @@ search(u_long addr, action_fn *action)
mib[5] = 0;
#endif
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
err(1, "route-sysctl-estimate");
xo_err(1, "route-sysctl-estimate");
if (needed == 0) /* empty table */
return 0;
buf = NULL;
for (;;) {
buf = reallocf(buf, needed);
if (buf == NULL)
errx(1, "could not reallocate memory");
xo_errx(1, "could not reallocate memory");
st = sysctl(mib, 6, buf, &needed, NULL, 0);
if (st == 0 || errno != ENOMEM)
break;
needed += needed / 8;
}
if (st == -1)
err(1, "actual retrieval of routing table");
xo_err(1, "actual retrieval of routing table");
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
@ -577,7 +606,9 @@ print_entry(struct sockaddr_dl *sdl,
if (ifnameindex == NULL)
if ((ifnameindex = if_nameindex()) == NULL)
err(1, "cannot retrieve interface names");
xo_err(1, "cannot retrieve interface names");
xo_open_instance("arp-cache");
if (nflag == 0)
hp = gethostbyaddr((caddr_t)&(addr->sin_addr),
@ -591,82 +622,87 @@ print_entry(struct sockaddr_dl *sdl,
if (h_errno == TRY_AGAIN)
nflag = 1;
}
printf("%s (%s) at ", host, inet_ntoa(addr->sin_addr));
xo_emit("{:hostname/%s} ({:ip-address/%s}) at ", host,
inet_ntoa(addr->sin_addr));
if (sdl->sdl_alen) {
if ((sdl->sdl_type == IFT_ETHER ||
sdl->sdl_type == IFT_L2VLAN ||
sdl->sdl_type == IFT_BRIDGE) &&
sdl->sdl_alen == ETHER_ADDR_LEN)
printf("%s",
xo_emit("{:mac-address/%s}",
ether_ntoa((struct ether_addr *)LLADDR(sdl)));
else {
int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
printf("%s", link_ntoa(sdl) + n);
xo_emit("{:mac-address/%s}", link_ntoa(sdl) + n);
}
} else
printf("(incomplete)");
xo_emit("{d:/(incomplete)}{en:incomplete/true}");
for (p = ifnameindex; p && ifnameindex->if_index &&
ifnameindex->if_name; p++) {
if (p->if_index == sdl->sdl_index) {
printf(" on %s", p->if_name);
xo_emit(" on {:interface/%s}", p->if_name);
break;
}
}
if (rtm->rtm_rmx.rmx_expire == 0)
printf(" permanent");
xo_emit("{d:/ permanent}{en:permanent/true}");
else {
static struct timespec tp;
if (tp.tv_sec == 0)
clock_gettime(CLOCK_MONOTONIC, &tp);
if ((expire_time = rtm->rtm_rmx.rmx_expire - tp.tv_sec) > 0)
printf(" expires in %d seconds", (int)expire_time);
xo_emit(" expires in {:expires/%d} seconds",
(int)expire_time);
else
printf(" expired");
xo_emit("{d:/ expired}{en:expired/true}");
}
if (rtm->rtm_flags & RTF_ANNOUNCE)
printf(" published");
xo_emit("{d:/ published}{en:published/true}");
switch(sdl->sdl_type) {
case IFT_ETHER:
printf(" [ethernet]");
xo_emit(" [{:type/ethernet}]");
break;
case IFT_ISO88025:
printf(" [token-ring]");
xo_emit(" [{:type/token-ring}]");
trld = SDL_ISO88025(sdl);
if (trld->trld_rcf != 0) {
printf(" rt=%x", ntohs(trld->trld_rcf));
xo_emit(" rt=%x", ntohs(trld->trld_rcf));
for (seg = 0;
seg < ((TR_RCF_RIFLEN(trld->trld_rcf) - 2 ) / 2);
seg++)
printf(":%x", ntohs(*(trld->trld_route[seg])));
xo_emit(":%x", ntohs(*(trld->trld_route[seg])));
}
break;
case IFT_FDDI:
printf(" [fddi]");
xo_emit(" [{:type/fddi}]");
break;
case IFT_ATM:
printf(" [atm]");
xo_emit(" [{:type/atm}]");
break;
case IFT_L2VLAN:
printf(" [vlan]");
xo_emit(" [{:type/vlan}]");
break;
case IFT_IEEE1394:
printf(" [firewire]");
xo_emit(" [{:type/firewire}]");
break;
case IFT_BRIDGE:
printf(" [bridge]");
xo_emit(" [{:type/bridge}]");
break;
case IFT_INFINIBAND:
printf(" [infiniband]");
xo_emit(" [{:type/infiniband}]");
break;
default:
break;
}
printf("\n");
xo_emit("\n");
xo_close_instance("arp-cache");
}
/*
@ -720,7 +756,7 @@ rtmsg(int cmd, struct sockaddr_in *dst, struct sockaddr_dl *sdl)
if (s < 0) { /* first time: open socket, get pid */
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0)
err(1, "socket");
xo_err(1, "socket");
pid = getpid();
}
bzero(&so_mask, sizeof(so_mask));
@ -740,7 +776,7 @@ rtmsg(int cmd, struct sockaddr_in *dst, struct sockaddr_dl *sdl)
switch (cmd) {
default:
errx(1, "internal wrong cmd");
xo_errx(1, "internal wrong cmd");
case RTM_ADD:
rtm->rtm_addrs |= RTA_GATEWAY;
rtm->rtm_rmx.rmx_expire = expire_time;
@ -773,7 +809,7 @@ rtmsg(int cmd, struct sockaddr_in *dst, struct sockaddr_dl *sdl)
rtm->rtm_type = cmd;
if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
if (errno != ESRCH || cmd != RTM_DELETE) {
warn("writing to routing socket");
xo_warn("writing to routing socket");
return (NULL);
}
}
@ -781,7 +817,7 @@ rtmsg(int cmd, struct sockaddr_in *dst, struct sockaddr_dl *sdl)
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
if (l < 0)
warn("read from routing socket");
xo_warn("read from routing socket");
return (rtm);
}
@ -805,12 +841,12 @@ get_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr)
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
err(1, "socket");
xo_err(1, "socket");
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
warnx("ioctl(SIOCGIFCONF)");
xo_warnx("ioctl(SIOCGIFCONF)");
goto done;
}