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ifconfig(8) now supports some output formatting options

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specified by the -f flag or IFCONFIG_FORMAT environment variable, the user
can request that inet4 subnet masks be printed in CIDR or dotted-quad
notation, in addition to the traditional hex output.
inet6 prefixes can be printed in CIDR as well.

For more documentation see the ifconfig(8) man page.

PR:		169072
Requested by:	seanc, marcel, brd, many others
Reviewed by:	gnn, jhb (earlier version)
Relnotes:	yes
Sponsored by:	ScaleEngine Inc.
Differential Revision:	https://reviews.freebsd.org/D2856
This commit is contained in:
Allan Jude 2016-05-31 17:30:08 +00:00
parent 0393e22f73
commit 7c2aa74437
5 changed files with 250 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
sbin/ifconfig/af_inet.c
View File

@ -54,11 +54,14 @@ static const char rcsid[] =
static struct in_aliasreq in_addreq;
static struct ifreq in_ridreq;
static char addr_buf[MAXHOSTNAMELEN *2 + 1]; /*for getnameinfo()*/
extern char *f_inet, *f_addr;
static void
in_status(int s __unused, const struct ifaddrs *ifa)
{
struct sockaddr_in *sin, null_sin;
int error, n_flags;
memset(&null_sin, 0, sizeof(null_sin));
@ -66,19 +69,47 @@ in_status(int s __unused, const struct ifaddrs *ifa)
if (sin == NULL)
return;
printf("\tinet %s ", inet_ntoa(sin->sin_addr));
if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
n_flags = 0;
else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
n_flags = NI_NOFQDN;
else
n_flags = NI_NUMERICHOST;
error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf,
sizeof(addr_buf), NULL, 0, n_flags);
if (error)
inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf));
printf("\tinet %s", addr_buf);
if (ifa->ifa_flags & IFF_POINTOPOINT) {
sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
if (sin == NULL)
sin = &null_sin;
printf("--> %s ", inet_ntoa(sin->sin_addr));
printf(" --> %s ", inet_ntoa(sin->sin_addr));
}
sin = (struct sockaddr_in *)ifa->ifa_netmask;
if (sin == NULL)
sin = &null_sin;
printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) {
int cidr = 32;
unsigned long smask;
smask = ntohl(sin->sin_addr.s_addr);
while ((smask & 1) == 0) {
smask = smask >> 1;
cidr--;
if (cidr == 0)
break;
}
printf("/%d ", cidr);
} else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0)
printf(" netmask %s ", inet_ntoa(sin->sin_addr));
else
printf(" netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
if (ifa->ifa_flags & IFF_BROADCAST) {
sin = (struct sockaddr_in *)ifa->ifa_broadaddr;

47
sbin/ifconfig/af_inet6.c
View File

@ -65,6 +65,7 @@ static int ip6lifetime;
static int prefix(void *, int);
static char *sec2str(time_t);
static int explicit_prefix = 0;
extern char *f_inet6, *f_addr, *f_scope;
extern void setnd6flags(const char *, int, int, const struct afswtch *);
extern void setnd6defif(const char *, int, int, const struct afswtch *);
@ -172,9 +173,10 @@ in6_status(int s __unused, const struct ifaddrs *ifa)
struct in6_ifreq ifr6;
int s6;
u_int32_t flags6;
const u_int16_t *a;
struct in6_addrlifetime lifetime;
struct timespec now;
int error;
int error, n_flags, i;
clock_gettime(CLOCK_MONOTONIC_FAST, &now);
@ -206,12 +208,30 @@ in6_status(int s __unused, const struct ifaddrs *ifa)
lifetime = ifr6.ifr_ifru.ifru_lifetime;
close(s6);
error = getnameinfo((struct sockaddr *)sin, sin->sin6_len, addr_buf,
sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);
if (error != 0)
inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
sizeof(addr_buf));
printf("\tinet6 %s ", addr_buf);
if (f_addr != NULL && strcmp(f_addr, "full") == 0) {
a = (const u_int16_t *)&sin->sin6_addr;
printf("\tinet6 ");
for (i = 0; i < 8; i++) {
printf("%04hx", ntohs(*(a + i)));
if (i < 7)
printf(":");
}
} else {
if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
n_flags = 0;
else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
n_flags = NI_NOFQDN;
else
n_flags = NI_NUMERICHOST;
error = getnameinfo((struct sockaddr *)sin, sin->sin6_len,
addr_buf, sizeof(addr_buf), NULL, 0,
n_flags);
if (error != 0 ||
(f_scope != NULL && strcmp(f_scope, "none") == 0))
inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
sizeof(addr_buf));
printf("\tinet6 %s", addr_buf);
}
if (ifa->ifa_flags & IFF_POINTOPOINT) {
sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
@ -229,15 +249,19 @@ in6_status(int s __unused, const struct ifaddrs *ifa)
if (error != 0)
inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
sizeof(addr_buf));
printf("--> %s ", addr_buf);
printf(" --> %s ", addr_buf);
}
}
sin = (struct sockaddr_in6 *)ifa->ifa_netmask;
if (sin == NULL)
sin = &null_sin;
printf("prefixlen %d ", prefix(&sin->sin6_addr,
sizeof(struct in6_addr)));
if (f_inet6 != NULL && strcmp(f_inet6, "cidr") == 0)
printf("/%d ", prefix(&sin->sin6_addr,
sizeof(struct in6_addr)));
else
printf(" prefixlen %d ", prefix(&sin->sin6_addr,
sizeof(struct in6_addr)));
if ((flags6 & IN6_IFF_ANYCAST) != 0)
printf("anycast ");
@ -256,7 +280,8 @@ in6_status(int s __unused, const struct ifaddrs *ifa)
if ((flags6 & IN6_IFF_PREFER_SOURCE) != 0)
printf("prefer_source ");
if (((struct sockaddr_in6 *)(ifa->ifa_addr))->sin6_scope_id)
if ((f_scope == NULL || strcmp(f_scope, "none") != 0) &&
((struct sockaddr_in6 *)(ifa->ifa_addr))->sin6_scope_id)
printf("scopeid 0x%x ",
((struct sockaddr_in6 *)(ifa->ifa_addr))->sin6_scope_id);

16
sbin/ifconfig/af_link.c
View File

@ -51,19 +51,31 @@ static const char rcsid[] =
static struct ifreq link_ridreq;
extern char *f_ether;
static void
link_status(int s __unused, const struct ifaddrs *ifa)
{
/* XXX no const 'cuz LLADDR is defined wrong */
struct sockaddr_dl *sdl = (struct sockaddr_dl *) ifa->ifa_addr;
char *ether_format;
int i;
if (sdl != NULL && sdl->sdl_alen > 0) {
if ((sdl->sdl_type == IFT_ETHER ||
sdl->sdl_type == IFT_L2VLAN ||
sdl->sdl_type == IFT_BRIDGE) &&
sdl->sdl_alen == ETHER_ADDR_LEN)
printf("\tether %s\n",
ether_ntoa((struct ether_addr *)LLADDR(sdl)));
if (f_ether != NULL && strcmp(f_ether, "dash") == 0) {
ether_format = ether_ntoa((struct ether_addr *)LLADDR(sdl));
for (i = 0; i < strlen(ether_format); i++) {
if (ether_format[i] == ':')
ether_format[i] = '-';
}
printf("\tether %s\n", ether_format);
} else
printf("\tether %s\n",
ether_ntoa((struct ether_addr *)LLADDR(sdl)));
else {
int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;

102
sbin/ifconfig/ifconfig.8
View File

@ -28,7 +28,7 @@
.\" From: @(#)ifconfig.8 8.3 (Berkeley) 1/5/94
.\" $FreeBSD$
.\"
.Dd November 6, 2015
.Dd May 29, 2016
.Dt IFCONFIG 8
.Os
.Sh NAME
@ -36,6 +36,7 @@
.Nd configure network interface parameters
.Sh SYNOPSIS
.Nm
.Op Fl f Ar type:format Ns Op Ar ,type:format
.Op Fl L
.Op Fl k
.Op Fl m
@ -194,6 +195,102 @@ for example,
List the interfaces in the given group.
.El
.Pp
The output format of
.Nm
can be controlled using the
.Fl f
flag or the
.Ev IFCONFIG_FORMAT
environment variable.
The format is specified as a comma separated list of
.Sy type:format
pairs.
See the
.Sx EXAMPLES
section for more information.
The
.Sy types
and their associated
.Sy format
strings are:
.Bl -tag -width scope
.It Sy addr
Adjust the display of inet and inet6 addresses
.Bl -tag -width default
.It Sy default
Display inet and inet6 addresses in the default format,
.Sy numeric
.It Sy fqdn
Display inet and inet6 addresses as fully qualified domain names
.Pq FQDN
.It Sy full
Display inet6 addresses without suppressing zeroes.
Only applicable to inet6
.It Sy host
Display inet and inet6 addresses as unqualified hostnames
.It Sy numeric
Display inet and inet6 addresses in numeric format
.El
.It Sy ether
Adjust the display of link-level ethernet (MAC) addresses
.Bl -tag -width default
.It Sy colon
Separate address segments with a colon
.It Sy dash
Separate address segments with a dash
.It Sy default
Display ethernet addresses in the default format,
.Sy colon
.El
.It Sy inet
Adjust the display of inet address subnet masks:
.Bl -tag -width default
.It Sy cidr
Display subnet masks in CIDR notation, for example:
.br
10.0.0.0/8 or 203.0.113.224/26
.It Sy default
Display subnet masks in the default format,
.Sy hex
.It Sy dotted
Display subnet masks in dotted quad notation, for example:
.br
255.255.0.0 or 255.255.255.192
.It Sy hex
Display subnet masks in hexidecimal, for example:
.br
0xffff0000 or 0xffffffc0
.El
.It Sy inet6
Adjust the display of inet6 address prefixes (subnet masks):
.Bl -tag -width default
.It Sy cidr
Display subnet prefix in CIDR notation, for example:
.br
::1/128 or fe80::1%lo0/64
.It Sy default
Display subnet prefix in the default format
.Sy numeric
.It Sy numeric
Display subnet prefix in integer format, for example:
.br
prefixlen 64
.El
.It Sy scope
Controls the display of the interface scope as part of the address.
Only applicable to inet6 addresses.
.Bl -tag -width default
.It Sy default
The interface scope and scopeid are included in the address, for example:
.br
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7
.It Sy none
The interface scope and scopeid are not displayed, for example:
.br
inet6 fe80::1 prefixlen 64
.El
.El
.Pp
The following parameters may be set with
.Nm :
.Bl -tag -width indent
@ -2855,6 +2952,9 @@ Destroy the software network interface
Display available wireless networks using
.Li wlan0 :
.Dl # ifconfig wlan0 list scan
.Pp
Display inet and inet6 address subnet masks in CIDR notation
.Dl # ifconfig -f inet:cidr,inet6:cidr
.Sh DIAGNOSTICS
Messages indicating the specified interface does not exist, the
requested address is unknown, or the user is not privileged and

70
sbin/ifconfig/ifconfig.c
View File

@ -98,6 +98,9 @@ int printifname = 0;
int supmedia = 0;
int printkeys = 0; /* Print keying material for interfaces. */
/* Formatter Strings */
char *f_inet, *f_inet6, *f_ether, *f_addr, *f_scope;
static int ifconfig(int argc, char *const *argv, int iscreate,
const struct afswtch *afp);
static void status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
@ -143,8 +146,8 @@ usage(void)
}
fprintf(stderr,
"usage: ifconfig %sinterface address_family [address [dest_address]]\n"
" [parameters]\n"
"usage: ifconfig [-f type:format] %sinterface address_family\n"
" [address [dest_address]] [parameters]\n"
" ifconfig interface create\n"
" ifconfig -a %s[-d] [-m] [-u] [-v] [address_family]\n"
" ifconfig -l [-d] [-u] [address_family]\n"
@ -243,6 +246,52 @@ cmpifaddrs(struct ifaddrs *a, struct ifaddrs *b, struct ifa_queue *q)
return (0);
}
static void freeformat(void)
{
if (f_inet != NULL)
free(f_inet);
if (f_inet6 != NULL)
free(f_inet6);
if (f_ether != NULL)
free(f_ether);
if (f_addr != NULL)
free(f_addr);
if (f_scope != NULL)
free(f_scope);
}
static void setformat(char *input)
{
char *formatstr, *category, *modifier;
formatstr = strdup(input);
while ((category = strsep(&formatstr, ",")) != NULL) {
modifier = strchr(category, ':');
if (modifier == NULL || modifier[1] == '\0') {
warnx("Skipping invalid format specification: %s\n",
category);
continue;
}
/* Split the string on the separator, then seek past it */
modifier[0] = '\0';
modifier++;
if (strcmp(category, "addr") == 0)
f_addr = strdup(modifier);
else if (strcmp(category, "ether") == 0)
f_ether = strdup(modifier);
else if (strcmp(category, "inet") == 0)
f_inet = strdup(modifier);
else if (strcmp(category, "inet6") == 0)
f_inet6 = strdup(modifier);
else if (strcmp(category, "scope") == 0)
f_scope = strdup(modifier);
}
free(formatstr);
}
#undef ORDERS_SIZE
static struct ifaddrs *
@ -315,7 +364,7 @@ main(int argc, char *argv[])
struct ifaddrs *ifap, *sifap, *ifa;
struct ifreq paifr;
const struct sockaddr_dl *sdl;
char options[1024], *cp, *namecp = NULL;
char options[1024], *cp, *envformat, *namecp = NULL;
struct ifa_queue q = TAILQ_HEAD_INITIALIZER(q);
struct ifa_order_elt *cur, *tmp;
const char *ifname;
@ -323,7 +372,12 @@ main(int argc, char *argv[])
size_t iflen;
all = downonly = uponly = namesonly = noload = verbose = 0;
f_inet = f_inet6 = f_ether = f_addr = f_scope = NULL;
envformat = getenv("IFCONFIG_FORMAT");
if (envformat != NULL)
setformat(envformat);
/*
* Ensure we print interface name when expected to,
* even if we terminate early due to error.
@ -331,7 +385,7 @@ main(int argc, char *argv[])
atexit(printifnamemaybe);
/* Parse leading line options */
strlcpy(options, "adklmnuv", sizeof(options));
strlcpy(options, "f:adklmnuv", sizeof(options));
for (p = opts; p != NULL; p = p->next)
strlcat(options, p->opt, sizeof(options));
while ((c = getopt(argc, argv, options)) != -1) {
@ -342,6 +396,11 @@ main(int argc, char *argv[])
case 'd': /* restrict scan to "down" interfaces */
downonly++;
break;
case 'f':
if (optarg == NULL)
usage();
setformat(optarg);
break;
case 'k':
printkeys++;
break;
@ -539,6 +598,7 @@ main(int argc, char *argv[])
printf("\n");
freeifaddrs(ifap);
freeformat();
exit(0);
}