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Some implementations of getopt() expect that argv[0] is always the

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program name, and ignore that entry.  ipfw2.c code instead skips
this entry and starts with options at offset 0, relying on a more
tolerant implementation of the library.

This change fixes the issue by always passing a program name
in the first entry to getopt. The motivation for this change
is to remove a potential compatibility issue should we use
a different getopt() implementation in the future.

No functional changes.

Submitted by:	Marta Carbone (parts)
MFC after:	4 weeks
This commit is contained in:
Luigi Rizzo 2009-01-26 14:03:39 +00:00
parent 477f656bb9
commit c562063980
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=187713
1 changed files with 42 additions and 27 deletions
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69
sbin/ipfw/ipfw2.c
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@ -6090,7 +6090,8 @@ show_nat(int ac, char **av)
}
/*
* Called with the arguments (excluding program name).
* Called with the arguments, including program name because getopt
* wants it to be present.
* Returns 0 if successful, 1 if empty command, errx() in case of errors.
*/
static int
@ -6102,16 +6103,16 @@ ipfw_main(int oldac, char **oldav)
int do_acct = 0; /* Show packet/byte count */
#define WHITESP " \t\f\v\n\r"
if (oldac == 0)
return 1;
else if (oldac == 1) {
if (oldac < 2)
return 1; /* need at least one argument */
if (oldac == 2) {
/*
* If we are called with a single string, try to split it into
* arguments for subsequent parsing.
* But first, remove spaces after a ',', by copying the string
* in-place.
*/
char *arg = oldav[0]; /* The string... */
char *arg = oldav[1]; /* The string is the first arg. */
int l = strlen(arg);
int copy = 0; /* 1 if we need to copy, 0 otherwise */
int i, j;
@ -6142,13 +6143,17 @@ ipfw_main(int oldac, char **oldav)
if (index(WHITESP, arg[i]) != NULL)
ac++;
av = calloc(ac, sizeof(char *));
/*
* Allocate the argument list, including one entry for
* the program name because getopt expects it.
*/
av = calloc(ac + 1, sizeof(char *));
/*
* Second, copy arguments from cmd[] to av[]. For each one,
* Second, copy arguments from arg[] to av[]. For each one,
* j is the initial character, i is the one past the end.
*/
for (ac = 0, i = j = 0; i < l; i++)
for (ac = 1, i = j = 0; i < l; i++)
if (index(WHITESP, arg[i]) != NULL || i == l-1) {
if (i == l-1)
i++;
@ -6164,7 +6169,7 @@ ipfw_main(int oldac, char **oldav)
int first, i, l;
av = calloc(oldac, sizeof(char *));
for (first = i = ac = 0, l = 0; i < oldac; i++) {
for (first = i = ac = 1, l = 0; i < oldac; i++) {
char *arg = oldav[i];
int k = strlen(arg);
@ -6183,6 +6188,7 @@ ipfw_main(int oldac, char **oldav)
}
}
av[0] = strdup(oldav[0]); /* copy progname from the caller */
/* Set the force flag for non-interactive processes */
if (!do_force)
do_force = !isatty(STDIN_FILENO);
@ -6191,7 +6197,7 @@ ipfw_main(int oldac, char **oldav)
save_ac = ac;
save_av = av;
optind = optreset = 0;
optind = optreset = 1; /* restart getopt() */
while ((ch = getopt(ac, av, "abcdefhinNqs:STtv")) != -1)
switch (ch) {
case 'a':
@ -6371,13 +6377,13 @@ ipfw_readfile(int ac, char *av[])
{
#define MAX_ARGS 32
char buf[BUFSIZ];
char *cmd = NULL, *filename = av[ac-1];
const char *progname = av[0]; /* original program name */
const char *cmd = NULL; /* preprocessor name, if any */
const char *filename = av[ac-1]; /* file to read */
int c, lineno=0;
FILE *f = NULL;
pid_t preproc = 0;
filename = av[ac-1];
while ((c = getopt(ac, av, "cfNnp:qS")) != -1) {
switch(c) {
case 'c':
@ -6397,18 +6403,28 @@ ipfw_readfile(int ac, char *av[])
break;
case 'p':
cmd = optarg;
/*
* Skip previous args and delete last one, so we
* pass all but the last argument to the preprocessor
* via av[optind-1]
* ipfw -p cmd [args] filename
*
* We are done with getopt(). All arguments
* except the filename go to the preprocessor,
* so we need to do the following:
* - check that a filename is actually present;
* - advance av by optind-1 to skip arguments
* already processed;
* - decrease ac by optind, to remove the args
* already processed and the final filename;
* - set the last entry in av[] to NULL so
* popen() can detect the end of the array;
* - set optind=ac to let getopt() terminate.
*/
av += optind - 1;
ac -= optind - 1;
if (ac < 2)
if (optind == ac)
errx(EX_USAGE, "no filename argument");
cmd = optarg;
av[ac-1] = NULL;
fprintf(stderr, "command is %s\n", av[0]);
av += optind - 1;
ac -= optind;
optind = ac;
break;
case 'q':
@ -6424,8 +6440,6 @@ ipfw_readfile(int ac, char *av[])
" summary ``ipfw''");
}
if (cmd != NULL)
break;
}
if (cmd == NULL && ac != optind + 1) {
@ -6474,13 +6488,14 @@ ipfw_readfile(int ac, char *av[])
while (fgets(buf, BUFSIZ, f)) { /* read commands */
char linename[10];
char *args[1];
char *args[2];
lineno++;
sprintf(linename, "Line %d", lineno);
setprogname(linename); /* XXX */
args[0] = buf;
ipfw_main(1, args);
args[0] = strdup(progname);
args[1] = buf;
ipfw_main(2, args);
}
fclose(f);
if (cmd != NULL) {
@ -6510,7 +6525,7 @@ main(int ac, char *av[])
if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
ipfw_readfile(ac, av);
else {
if (ipfw_main(ac-1, av+1))
if (ipfw_main(ac, av))
show_usage();
}
return EX_OK;