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cmd3.c
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cmd3.c
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/*
* Heirloom mailx - a mail user agent derived from Berkeley Mail.
*
* Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
*/
/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#ifndef lint
#ifdef DOSCCS
static char sccsid[] = "@(#)cmd3.c 2.87 (gritter) 10/1/08";
#endif
#endif /* not lint */
#include <math.h>
#include <float.h>
#include "rcv.h"
#include "extern.h"
#include <unistd.h>
#include <errno.h>
/*
* Mail -- a mail program
*
* Still more user commands.
*/
static int bangexp(char **str, size_t *size);
static void make_ref_and_cs(struct message *mp, struct header *head);
static int (*respond_or_Respond(int c))(int *, int);
static int respond_internal(int *msgvec, int recipient_record);
static char *reedit(char *subj);
static char *fwdedit(char *subj);
static void onpipe(int signo);
static void asort(char **list);
static int diction(const void *a, const void *b);
static int file1(char *name);
static int shellecho(const char *cp);
static int Respond_internal(int *msgvec, int recipient_record);
static int resend1(void *v, int add_resent);
static void list_shortcuts(void);
static enum okay delete_shortcut(const char *str);
static float huge(void);
/*
* Process a shell escape by saving signals, ignoring signals,
* and forking a sh -c
*/
int
shell(void *v)
{
char *str = v;
sighandler_type sigint = safe_signal(SIGINT, SIG_IGN);
char *shell;
char *cmd;
size_t cmdsize;
cmd = smalloc(cmdsize = strlen(str) + 1);
strcpy(cmd, str);
if (bangexp(&cmd, &cmdsize) < 0)
return 1;
if ((shell = value("SHELL")) == NULL)
shell = SHELL;
run_command(shell, 0, -1, -1, "-c", cmd, NULL);
safe_signal(SIGINT, sigint);
printf("!\n");
free(cmd);
return 0;
}
/*
* Fork an interactive shell.
*/
/*ARGSUSED*/
int
dosh(void *v)
{
sighandler_type sigint = safe_signal(SIGINT, SIG_IGN);
char *shell;
if ((shell = value("SHELL")) == NULL)
shell = SHELL;
run_command(shell, 0, -1, -1, NULL, NULL, NULL);
safe_signal(SIGINT, sigint);
putchar('\n');
return 0;
}
/*
* Expand the shell escape by expanding unescaped !'s into the
* last issued command where possible.
*/
static char *lastbang;
static size_t lastbangsize;
static int
bangexp(char **str, size_t *size)
{
char *bangbuf;
int changed = 0;
int dobang = value("bang") != NULL;
size_t sz, i, j, bangbufsize;
bangbuf = smalloc(bangbufsize = *size);
i = j = 0;
while ((*str)[i]) {
if (dobang) {
if ((*str)[i] == '!') {
sz = strlen(lastbang);
bangbuf = srealloc(bangbuf, bangbufsize += sz);
changed++;
strcpy(&bangbuf[j], lastbang);
j += sz;
i++;
continue;
}
}
if ((*str)[i] == '\\' && (*str)[i + 1] == '!') {
bangbuf[j++] = '!';
i += 2;
changed++;
}
bangbuf[j++] = (*str)[i++];
}
bangbuf[j] = '\0';
if (changed) {
printf("!%s\n", bangbuf);
fflush(stdout);
}
sz = j;
if (sz >= *size)
*str = srealloc(*str, *size = sz + 1);
strcpy(*str, bangbuf);
if (sz >= lastbangsize)
lastbang = srealloc(lastbang, lastbangsize = sz + 1);
strcpy(lastbang, bangbuf);
free(bangbuf);
return(0);
}
/*ARGSUSED*/
int
help(void *v)
{
const char *helptext =
" %s commands\n\
type <message list> type messages\n\
next goto and type next message\n\
from <message list> give head lines of messages\n\
headers print out active message headers\n\
delete <message list> delete messages\n\
undelete <message list> undelete messages\n\
save <message list> folder append messages to folder and mark as saved\n\
copy <message list> folder append messages to folder without marking them\n\
write <message list> file append message texts to file, save attachments\n\
preserve <message list> keep incoming messages in mailbox even if saved\n\
Reply <message list> reply to message senders\n\
reply <message list> reply to message senders and all recipients\n\
mail addresses mail to specific recipients\n\
file folder change to another folder\n\
quit quit and apply changes to folder\n\
xit quit and discard changes made to folder\n\
! shell escape\n\
cd <directory> chdir to directory or home if none given\n\
list list names of all available commands\n\
\n\
A <message list> consists of integers, ranges of same, or other criteria\n\
separated by spaces. If omitted, %s uses the last message typed.\n";
fprintf(stdout, helptext, progname, progname);
return(0);
}
/*
* Change user's working directory.
*/
int
schdir(void *v)
{
char **arglist = v;
char *cp;
if (*arglist == NULL)
cp = homedir;
else
if ((cp = expand(*arglist)) == NULL)
return(1);
if (chdir(cp) < 0) {
perror(cp);
return(1);
}
return 0;
}
static void
make_ref_and_cs(struct message *mp, struct header *head)
{
char *oldref, *oldmsgid, *newref, *cp;
size_t reflen;
unsigned i;
struct name *n;
oldref = hfield("references", mp);
oldmsgid = hfield("message-id", mp);
if (oldmsgid == NULL || *oldmsgid == '\0') {
head->h_ref = NULL;
return;
}
reflen = 1;
if (oldref)
reflen += strlen(oldref) + 2;
if (oldmsgid)
reflen += strlen(oldmsgid);
newref = ac_alloc(reflen);
if (oldref) {
strcpy(newref, oldref);
if (oldmsgid) {
strcat(newref, ", ");
strcat(newref, oldmsgid);
}
} else if (oldmsgid)
strcpy(newref, oldmsgid);
n = extract(newref, GREF);
ac_free(newref);
/*
* Limit the references to 21 entries.
*/
while (n->n_flink != NULL)
n = n->n_flink;
for (i = 1; i < 21; i++) {
if (n->n_blink != NULL)
n = n->n_blink;
else
break;
}
n->n_blink = NULL;
head->h_ref = n;
if (value("reply-in-same-charset") != NULL &&
(cp = hfield("content-type", mp)) != NULL)
head->h_charset = mime_getparam("charset", cp);
}
static int
(*respond_or_Respond(int c))(int *, int)
{
int opt = 0;
opt += (value("Replyall") != NULL);
opt += (value("flipr") != NULL);
return ((opt == 1) ^ (c == 'R')) ? Respond_internal : respond_internal;
}
int
respond(void *v)
{
return (respond_or_Respond('r'))((int *)v, 0);
}
int
respondall(void *v)
{
return respond_internal((int *)v, 0);
}
int
respondsender(void *v)
{
return Respond_internal((int *)v, 0);
}
int
followup(void *v)
{
return (respond_or_Respond('r'))((int *)v, 1);
}
int
followupall(void *v)
{
return respond_internal((int *)v, 1);
}
int
followupsender(void *v)
{
return Respond_internal((int *)v, 1);
}
/*
* Reply to a list of messages. Extract each name from the
* message header and send them off to mail1()
*/
static int
respond_internal(int *msgvec, int recipient_record)
{
int Eflag;
struct message *mp;
char *cp, *rcv;
enum gfield gf = value("fullnames") ? GFULL : GSKIN;
struct name *np = NULL;
struct header head;
memset(&head, 0, sizeof head);
if (msgvec[1] != 0) {
printf(catgets(catd, CATSET, 37,
"Sorry, can't reply to multiple messages at once\n"));
return(1);
}
mp = &message[msgvec[0] - 1];
touch(mp);
setdot(mp);
if ((rcv = hfield("reply-to", mp)) == NULL)
if ((rcv = hfield("from", mp)) == NULL)
rcv = nameof(mp, 1);
if (rcv != NULL)
np = sextract(rcv, GTO|gf);
if ((cp = hfield("to", mp)) != NULL)
np = cat(np, sextract(cp, GTO|gf));
np = elide(np);
/*
* Delete my name from the reply list,
* and with it, all my alternate names.
*/
np = delete_alternates(np);
if (np == NULL)
np = sextract(rcv, GTO|gf);
head.h_to = np;
if ((head.h_subject = hfield("subject", mp)) == NULL)
head.h_subject = hfield("subj", mp);
head.h_subject = reedit(head.h_subject);
if ((cp = hfield("cc", mp)) != NULL) {
np = elide(sextract(cp, GCC|gf));
np = delete_alternates(np);
head.h_cc = np;
}
make_ref_and_cs(mp, &head);
Eflag = value("skipemptybody") != NULL;
if (mail1(&head, 1, mp, NULL, recipient_record, 0, 0, Eflag) == OKAY &&
value("markanswered") && (mp->m_flag & MANSWERED) == 0)
mp->m_flag |= MANSWER|MANSWERED;
return(0);
}
/*
* Modify the subject we are replying to to begin with Re: if
* it does not already.
*/
static char *
reedit(char *subj)
{
char *newsubj;
struct str in, out;
if (subj == NULL || *subj == '\0')
return NULL;
in.s = subj;
in.l = strlen(subj);
mime_fromhdr(&in, &out, TD_ISPR|TD_ICONV);
if ((out.s[0] == 'r' || out.s[0] == 'R') &&
(out.s[1] == 'e' || out.s[1] == 'E') &&
out.s[2] == ':')
return out.s;
newsubj = salloc(out.l + 5);
strcpy(newsubj, "Re: ");
strcpy(newsubj + 4, out.s);
return newsubj;
}
/*
* Forward a message to a new recipient, in the sense of RFC 2822.
*/
static int
forward1(char *str, int recipient_record)
{
int Eflag;
int *msgvec, f;
char *recipient;
struct message *mp;
struct header head;
int forward_as_attachment;
forward_as_attachment = value("forward-as-attachment") != NULL;
msgvec = salloc((msgCount + 2) * sizeof *msgvec);
if ((recipient = laststring(str, &f, 0)) == NULL) {
puts(catgets(catd, CATSET, 47, "No recipient specified."));
return 1;
}
if (!f) {
*msgvec = first(0, MMNORM);
if (*msgvec == 0) {
if (inhook)
return 0;
printf("No messages to forward.\n");
return 1;
}
msgvec[1] = 0;
}
if (f && getmsglist(str, msgvec, 0) < 0)
return 1;
if (*msgvec == 0) {
if (inhook)
return 0;
printf("No applicable messages.\n");
return 1;
}
if (msgvec[1] != 0) {
printf("Cannot forward multiple messages at once\n");
return 1;
}
memset(&head, 0, sizeof head);
if ((head.h_to = sextract(recipient,
GTO | (value("fullnames") ? GFULL : GSKIN))) == NULL)
return 1;
mp = &message[*msgvec - 1];
if (forward_as_attachment) {
head.h_attach = csalloc(1, sizeof *head.h_attach);
head.h_attach->a_msgno = *msgvec;
} else {
touch(mp);
setdot(mp);
}
if ((head.h_subject = hfield("subject", mp)) == NULL)
head.h_subject = hfield("subj", mp);
head.h_subject = fwdedit(head.h_subject);
Eflag = value("skipemptybody") != NULL;
mail1(&head, 1, forward_as_attachment ? NULL : mp,
NULL, recipient_record, 1, 0, Eflag);
return 0;
}
/*
* Modify the subject we are replying to to begin with Fwd:.
*/
static char *
fwdedit(char *subj)
{
char *newsubj;
struct str in, out;
if (subj == NULL || *subj == '\0')
return NULL;
in.s = subj;
in.l = strlen(subj);
mime_fromhdr(&in, &out, TD_ISPR|TD_ICONV);
newsubj = salloc(strlen(out.s) + 6);
strcpy(newsubj, "Fwd: ");
strcpy(&newsubj[5], out.s);
free(out.s);
return newsubj;
}
/*
* The 'forward' command.
*/
int
forwardcmd(void *v)
{
return forward1(v, 0);
}
/*
* Similar to forward, saving the message in a file named after the
* first recipient.
*/
int
Forwardcmd(void *v)
{
return forward1(v, 1);
}
/*
* Preserve the named messages, so that they will be sent
* back to the system mailbox.
*/
int
preserve(void *v)
{
int *msgvec = v;
struct message *mp;
int *ip, mesg;
if (edit) {
printf(catgets(catd, CATSET, 39,
"Cannot \"preserve\" in edit mode\n"));
return(1);
}
for (ip = msgvec; *ip != 0; ip++) {
mesg = *ip;
mp = &message[mesg-1];
mp->m_flag |= MPRESERVE;
mp->m_flag &= ~MBOX;
setdot(mp);
/*
* This is now Austin Group Request XCU #20.
*/
did_print_dot = 1;
}
return(0);
}
/*
* Mark all given messages as unread.
*/
int
unread(void *v)
{
int *msgvec = v;
int *ip;
for (ip = msgvec; *ip != 0; ip++) {
setdot(&message[*ip-1]);
dot->m_flag &= ~(MREAD|MTOUCH);
dot->m_flag |= MSTATUS;
if (mb.mb_type == MB_IMAP || mb.mb_type == MB_CACHE)
imap_unread(&message[*ip-1], *ip);
/*
* The "unread" command is not part of POSIX mailx.
*/
did_print_dot = 1;
}
return(0);
}
/*
* Mark all given messages as read.
*/
int
seen(void *v)
{
int *msgvec = v;
int *ip;
for (ip = msgvec; *ip; ip++) {
setdot(&message[*ip-1]);
touch(&message[*ip-1]);
}
return 0;
}
/*
* Print the size of each message.
*/
int
messize(void *v)
{
int *msgvec = v;
struct message *mp;
int *ip, mesg;
for (ip = msgvec; *ip != 0; ip++) {
mesg = *ip;
mp = &message[mesg-1];
printf("%d: ", mesg);
if (mp->m_xlines > 0)
printf("%ld", mp->m_xlines);
else
putchar(' ');
printf("/%lu\n", (unsigned long)mp->m_xsize);
}
return(0);
}
/*
* Quit quickly. If we are sourcing, just pop the input level
* by returning an error.
*/
/*ARGSUSED*/
int
rexit(void *v)
{
if (sourcing)
return(1);
exit(0);
/*NOTREACHED*/
}
static sigjmp_buf pipejmp;
/*ARGSUSED*/
static void
onpipe(int signo)
{
siglongjmp(pipejmp, 1);
}
/*
* Set or display a variable value. Syntax is similar to that
* of sh.
*/
int
set(void *v)
{
char **arglist = v;
struct var *vp;
char *cp, *cp2;
char **ap, **p;
int errs, h, s;
FILE *obuf = stdout;
int bsdset = value("bsdcompat") != NULL || value("bsdset") != NULL;
(void)&cp;
(void)≈
(void)&obuf;
(void)&bsdset;
if (*arglist == NULL) {
for (h = 0, s = 1; h < HSHSIZE; h++)
for (vp = variables[h]; vp != NULL; vp = vp->v_link)
s++;
/*LINTED*/
ap = (char **)salloc(s * sizeof *ap);
for (h = 0, p = ap; h < HSHSIZE; h++)
for (vp = variables[h]; vp != NULL; vp = vp->v_link)
*p++ = vp->v_name;
*p = NULL;
asort(ap);
if (is_a_tty[0] && is_a_tty[1] && (cp = value("crt")) != NULL) {
if (s > (*cp == '\0' ? screensize() : atoi(cp)) + 3) {
cp = get_pager();
if (sigsetjmp(pipejmp, 1))
goto endpipe;
if ((obuf = Popen(cp, "w", NULL, 1)) == NULL) {
perror(cp);
obuf = stdout;
} else
safe_signal(SIGPIPE, onpipe);
}
}
for (p = ap; *p != NULL; p++) {
if (bsdset)
fprintf(obuf, "%s\t%s\n", *p, value(*p));
else {
if ((cp = value(*p)) != NULL && *cp)
fprintf(obuf, "%s=\"%s\"\n",
*p, value(*p));
else
fprintf(obuf, "%s\n", *p);
}
}
endpipe:
if (obuf != stdout) {
safe_signal(SIGPIPE, SIG_IGN);
Pclose(obuf);
safe_signal(SIGPIPE, dflpipe);
}
return(0);
}
errs = 0;
for (ap = arglist; *ap != NULL; ap++) {
char *varbuf;
varbuf = ac_alloc(strlen(*ap) + 1);
cp = *ap;
cp2 = varbuf;
while (*cp != '=' && *cp != '\0')
*cp2++ = *cp++;
*cp2 = '\0';
if (*cp == '\0')
cp = "";
else
cp++;
if (equal(varbuf, "")) {
printf(catgets(catd, CATSET, 41,
"Non-null variable name required\n"));
errs++;
ac_free(varbuf);
continue;
}
if (varbuf[0] == 'n' && varbuf[1] == 'o')
errs += unset_internal(&varbuf[2]);
else
assign(varbuf, cp);
ac_free(varbuf);
}
return(errs);
}
/*
* Unset a bunch of variable values.
*/
int
unset(void *v)
{
int errs;
char **ap;
errs = 0;
for (ap = (char **)v; *ap != NULL; ap++)
errs += unset_internal(*ap);
return(errs);
}
/*
* Put add users to a group.
*/
int
group(void *v)
{
char **argv = v;
struct grouphead *gh;
struct group *gp;
int h;
int s;
char **ap, *gname, **p;
if (*argv == NULL) {
for (h = 0, s = 1; h < HSHSIZE; h++)
for (gh = groups[h]; gh != NULL; gh = gh->g_link)
s++;
/*LINTED*/
ap = (char **)salloc(s * sizeof *ap);
for (h = 0, p = ap; h < HSHSIZE; h++)
for (gh = groups[h]; gh != NULL; gh = gh->g_link)
*p++ = gh->g_name;
*p = NULL;
asort(ap);
for (p = ap; *p != NULL; p++)
printgroup(*p);
return(0);
}
if (argv[1] == NULL) {
printgroup(*argv);
return(0);
}
gname = *argv;
h = hash(gname);
if ((gh = findgroup(gname)) == NULL) {
gh = (struct grouphead *)scalloc(1, sizeof *gh);
gh->g_name = vcopy(gname);
gh->g_list = NULL;
gh->g_link = groups[h];
groups[h] = gh;
}
/*
* Insert names from the command list into the group.
* Who cares if there are duplicates? They get tossed
* later anyway.
*/
for (ap = argv+1; *ap != NULL; ap++) {
gp = (struct group *)scalloc(1, sizeof *gp);
gp->ge_name = vcopy(*ap);
gp->ge_link = gh->g_list;
gh->g_list = gp;
}
return(0);
}
/*
* Delete the passed groups.
*/
int
ungroup(void *v)
{
char **argv = v;
if (*argv == NULL) {
printf(catgets(catd, CATSET, 209,
"Must specify alias or group to remove\n"));
return 1;
}
do
remove_group(*argv);
while (*++argv != NULL);
return 0;
}
/*
* Sort the passed string vecotor into ascending dictionary
* order.
*/
static void
asort(char **list)
{
char **ap;
for (ap = list; *ap != NULL; ap++)
;
if (ap-list < 2)
return;
qsort(list, ap-list, sizeof(*list), diction);
}
/*
* Do a dictionary order comparison of the arguments from
* qsort.
*/
static int
diction(const void *a, const void *b)
{
return(strcmp(*(char **)a, *(char **)b));
}
/*
* Change to another file. With no argument, print information about
* the current file.
*/
int
cfile(void *v)
{
char **argv = v;
if (argv[0] == NULL) {
newfileinfo();
return 0;
}
strncpy(mboxname, expand("&"), sizeof mboxname)[sizeof mboxname-1]='\0';
return file1(*argv);
}
static int
file1(char *name)
{
int i;
if (inhook) {
fprintf(stderr, "Cannot change folder from within a hook.\n");
return 1;
}
i = setfile(name, 0);
if (i < 0)
return 1;
callhook(mailname, 0);
if (i > 0 && value("emptystart") == NULL)
return 1;
announce(value("bsdcompat") != NULL || value("bsdannounce") != NULL);
return 0;
}
static int
shellecho(const char *cp)
{
int cflag = 0, n;
char c;
while (*cp) {
if (*cp == '\\') {
switch (*++cp) {
case '\0':
return cflag;
case 'a':
putchar('\a');
break;
case 'b':
putchar('\b');
break;
case 'c':
cflag = 1;
break;
case 'f':
putchar('\f');
break;
case 'n':
putchar('\n');
break;
case 'r':
putchar('\r');
break;
case 't':
putchar('\t');
break;
case 'v':
putchar('\v');
break;
default:
putchar(*cp&0377);
break;
case '0':
c = 0;
n = 3;
while (n-- && octalchar(cp[1]&0377)) {
c <<= 3;
c |= cp[1] - '0';
cp++;
}
putchar(c);
}
} else
putchar(*cp & 0377);
cp++;
}
return cflag;
}
/*
* Expand file names like echo
*/
int
echo(void *v)
{
char **argv = v;
char **ap;
char *cp;
int cflag = 0;
for (ap = argv; *ap != NULL; ap++) {
cp = *ap;
if ((cp = expand(cp)) != NULL) {
if (ap != argv)
putchar(' ');
cflag |= shellecho(cp);
}
}
if (!cflag)
putchar('\n');
return 0;
}
int
Respond(void *v)
{
return (respond_or_Respond('R'))((int *)v, 0);
}
int
Followup(void *v)
{
return (respond_or_Respond('R'))((int *)v, 1);
}
/*
* Reply to a series of messages by simply mailing to the senders
* and not messing around with the To: and Cc: lists as in normal
* reply.
*/
static int
Respond_internal(int *msgvec, int recipient_record)
{
int Eflag;
struct header head;
struct message *mp;
enum gfield gf = value("fullnames") ? GFULL : GSKIN;
int *ap;
char *cp;
memset(&head, 0, sizeof head);
for (ap = msgvec; *ap != 0; ap++) {
mp = &message[*ap - 1];
touch(mp);
setdot(mp);
if ((cp = hfield("reply-to", mp)) == NULL)
if ((cp = hfield("from", mp)) == NULL)
cp = nameof(mp, 2);
head.h_to = cat(head.h_to, sextract(cp, GTO|gf));
}
if (head.h_to == NULL)
return 0;
mp = &message[msgvec[0] - 1];
if ((head.h_subject = hfield("subject", mp)) == NULL)
head.h_subject = hfield("subj", mp);
head.h_subject = reedit(head.h_subject);
make_ref_and_cs(mp, &head);
Eflag = value("skipemptybody") != NULL;
if (mail1(&head, 1, mp, NULL, recipient_record, 0, 0, Eflag) == OKAY &&
value("markanswered") && (mp->m_flag & MANSWERED) == 0)
mp->m_flag |= MANSWER|MANSWERED;
return 0;
}
/*
* Conditional commands. These allow one to parameterize one's
* .mailrc and do some things if sending, others if receiving.
*/
int
ifcmd(void *v)
{
char **argv = v;
char *cp;