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Strip quote characters in macro expansion if we do not split the result
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A problem with the old handling of %quote was that it leaked to
the outside. This commit strips the quote characters if they are
not used in argument splitting.

We also keep track of the quotes when defining macros so that
we stay compatible to the old implementation.
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@mlschroe
mlschroe committed Nov 28, 2023
1 parent 375c10a commit 0dbd4e2
Showing 1 changed file with 86 additions and 10 deletions.
96 changes: 86 additions & 10 deletions rpmio/macro.c
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ enum macroFlags_e {
ME_LITERAL = (1 << 2),
ME_PARSE = (1 << 3),
ME_FUNC = (1 << 4),
ME_QUOTED = (1 << 5),
};

/*! The structure used to store a macro. */
Expand Down Expand Up @@ -133,6 +134,7 @@ static int print_expand_trace = _PRINT_EXPAND_TRACE;

/* forward ref */
static int expandMacro(rpmMacroBuf mb, const char *src, size_t slen);
static int expandQuotedMacro(rpmMacroBuf mb, const char *src);
static void pushMacro(rpmMacroContext mc,
const char * n, const char * o, const char * b, int level, int flags);
static void popMacro(rpmMacroContext mc, const char * n);
Expand Down Expand Up @@ -437,19 +439,23 @@ printExpansion(rpmMacroBuf mb, rpmMacroEntry me, const char * t, const char * te
* @return result of expansion
*/
static int
expandThis(rpmMacroBuf mb, const char * src, size_t slen, char **target)
expandThis(rpmMacroBuf mb, const char * src, size_t slen, char **target, int *flagsp)
{
struct rpmMacroBuf_s umb;

/* Copy other state from "parent", but we want a buffer of our own */
umb = *mb;
umb.buf = NULL;
umb.error = 0;
if (flagsp)
umb.flags = *flagsp;
/* In case of error, flag it in the "parent"... */
if (expandMacro(&umb, src, slen))
mb->error = 1;
*target = umb.buf;

if (flagsp)
*flagsp = umb.flags;
/* ...but return code for this operation specifically */
return umb.error;
}
Expand Down Expand Up @@ -527,6 +533,20 @@ void rpmMacroBufAppendStr(rpmMacroBuf mb, const char *str)
mb->nb -= len;
}

static void mbUnquote(rpmMacroBuf mb, size_t off)
{
const int qchar = 0x1f; /* ASCII unit separator */
while (off < mb->tpos) {
if (mb->buf[off] == qchar) {
memmove(mb->buf + off, mb->buf + off + 1, mb->tpos - off - 1);
mb->tpos--;
mb->nb++;
} else {
off++;
}
}
}

static void doDnl(rpmMacroBuf mb, rpmMacroEntry me, ARGV_t argv, size_t *parsed)
{
const char *se = argv[1];
Expand All @@ -552,7 +572,7 @@ doShellEscape(rpmMacroBuf mb, const char * cmd, size_t clen)
FILE *shf;
int c;

if (expandThis(mb, cmd, clen, &buf))
if (expandThis(mb, cmd, clen, &buf, NULL))
goto exit;

if ((shf = popen(buf, "r")) == NULL) {
Expand Down Expand Up @@ -670,6 +690,7 @@ doDefine(rpmMacroBuf mb, const char * se, int level, int expandbody, size_t *par
int oc = ')';
const char *sbody; /* as-is body start */
int rc = 1; /* assume failure */
int flags = ME_NONE;

/* Copy name */
COPYNAME(ne, s, c);
Expand Down Expand Up @@ -766,14 +787,17 @@ doDefine(rpmMacroBuf mb, const char * se, int level, int expandbody, size_t *par
rpmMacroBufErr(mb, 0, _("Macro %%%s needs whitespace before body\n"), n);

if (expandbody) {
if (expandThis(mb, b, 0, &ebody)) {
int eflags = RPMEXPAND_KEEP_QUOTED;
if (expandThis(mb, b, 0, &ebody, &eflags)) {
rpmMacroBufErr(mb, 1, _("Macro %%%s failed to expand\n"), n);
goto exit;
}
b = ebody;
if (eflags & RPMEXPAND_HAVE_QUOTED)
flags |= ME_QUOTED;
}

pushMacro(mb->mc, n, o, b, level, ME_NONE);
pushMacro(mb->mc, n, o, b, level, flags);
rc = 0;

exit:
Expand Down Expand Up @@ -884,8 +908,8 @@ setupArgs(rpmMacroBuf mb, const rpmMacroEntry me, ARGV_t argv)
* through for higher level processing (e.g. %description and/or %setup).
* This is the (potential) justification for %{**} ...
*/
args = argvJoin(argv + 1, " ");
pushMacro(mb->mc, "**", NULL, args, mb->level, ME_AUTO | ME_LITERAL);
args = unsplitQuoted(argv + 1, " ");
pushMacro(mb->mc, "**", NULL, args, mb->level, ME_AUTO | ME_LITERAL | ME_QUOTED);
free(args);

argc = argvCount(argv);
Expand Down Expand Up @@ -1036,8 +1060,9 @@ grabArgs(rpmMacroBuf mb, const rpmMacroEntry me, ARGV_t *argvp,
argvAddN(argvp, se, lastc - se);
} else {
char *s = NULL;
int eflags = mb->flags | (splitargs ? RPMEXPAND_KEEP_QUOTED : 0);
/* Expand possible macros in arguments */
expandThis(mb, lastc == se ? "" : se, lastc - se, &s);
expandThis(mb, lastc == se ? "" : se, lastc - se, &s, &eflags);
if (splitargs)
splitQuoted(argvp, s, " \t");
else
Expand Down Expand Up @@ -1304,7 +1329,17 @@ static void doFoo(rpmMacroBuf mb, rpmMacroEntry me, ARGV_t argv, size_t *parsed)
*b = 0;
b = buf;
} else if (rstreq("quote", me->name)) {
b = buf = unsplitQuoted(argv + 1, " ");
if (mb->flags & RPMEXPAND_KEEP_QUOTED) {
b = buf = unsplitQuoted(argv + 1, " ");
if (b && *b)
mb->flags |= RPMEXPAND_HAVE_QUOTED;
} else {
for (argv++; *argv; argv++) {
rpmMacroBufAppendStr(mb, *argv);
if (argv[1])
rpmMacroBufAppend(mb, ' ');
}
}
} else if (rstreq("suffix", me->name)) {
buf = xstrdup(argv[1]);
if ((b = strrchr(buf, '.')) != NULL)
Expand Down Expand Up @@ -1453,6 +1488,7 @@ doMacro(rpmMacroBuf mb, rpmMacroEntry me, ARGV_t args, size_t *parsed)
{
rpmMacroEntry prevme = mb->me;
ARGV_t prevarg = mb->args;
size_t old_tpos = mb->tpos;

/* Recursively expand body of macro */
if (me->flags & ME_FUNC) {
Expand All @@ -1472,16 +1508,56 @@ doMacro(rpmMacroBuf mb, rpmMacroEntry me, ARGV_t args, size_t *parsed)
/* Setup args for "%name " macros with opts */
if (args != NULL)
setupArgs(mb, me, args);
expandMacro(mb, me->body, 0);
if ((me->flags & ME_QUOTED) && (mb->flags & RPMEXPAND_KEEP_QUOTED) != 0)
expandQuotedMacro(mb, me->body);
else
expandMacro(mb, me->body, 0);
/* Free args for "%name " macros with opts */
if (args != NULL)
freeArgs(mb);
}

/* postprocess macros that contain quotes */
if ((me->flags & ME_QUOTED) != 0) {
if ((mb->flags & RPMEXPAND_KEEP_QUOTED) == 0)
mbUnquote(mb, old_tpos);
else
mb->flags |= RPMEXPAND_HAVE_QUOTED;
}

exit:
mb->args = prevarg;
mb->me = prevme;
}

/**
* Expand a string that contains quote characters
* @param mb macro expansion state
* @param src string to expand
* @return 0 on success, 1 on failure
*/
static int
expandQuotedMacro(rpmMacroBuf mb, const char *src)
{
const int qchar = 0x1f; /* ASCII unit separator */
const char *p, *sp;
char *source = xstrdup(src);
for (sp = p = source; *p; p++) {
if (*p == qchar) {
if (p > sp)
expandMacro(mb, sp, p - sp);
rpmMacroBufAppend(mb, qchar);
mb->flags ^= RPMEXPAND_KEEP_QUOTED;
sp = p + 1;
}
}
if (p > sp)
expandMacro(mb, sp, p - sp);
mb->flags |= RPMEXPAND_KEEP_QUOTED;
free(source);
return mb->error;
}

/**
* The main macro recursion loop.
* @param mb macro expansion state
Expand Down Expand Up @@ -1710,7 +1786,7 @@ expandThisMacro(rpmMacroBuf mb, rpmMacroEntry me, ARGV_const_t args, int flags)
ARGV_const_t av = args;
for (av = args; av && *av; av++) {
char *s = NULL;
expandThis(mb, *av, 0, &s);
expandThis(mb, *av, 0, &s, NULL);
argvAdd(&optargs, s);
free(s);
}
Expand Down

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