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udev-rules: all values can contain escaped double quotes now (#6890)

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This is primarly useful to support escaped double quotes in PROGRAM or
IMPORT{program} directives.

The only possibilty before this patch was to use an external shell script but
this seems too cumbersome for trivial logics such as

 PROGRAM=="/bin/sh -c 'FOO=\"%s{model}\"; echo ${FOO:0:4}'"

or any similar shell constructs that needs to deals with patterns including
whitespaces.

As it's the case for single quote and for directives running a program, words
within escaped double quotes will be considered as a single argument.

Fixes: #6835
This commit is contained in:
Franck Bui 2017-09-28 08:53:46 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 9500b9209b
commit 7e760b79ad
3 changed files with 47 additions and 9 deletions
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8
src/udev/udev-event.c
View File

@ -720,10 +720,12 @@ int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
pos = cmd;
while (pos != NULL && pos[0] != '\0') {
if (pos[0] == '\'') {
/* do not separate quotes */
if (IN_SET(pos[0], '\'', '"')) {
/* do not separate quotes or double quotes */
char delim[2] = { pos[0], '\0' };
pos++;
argv[i] = strsep(&pos, "\'");
argv[i] = strsep(&pos, delim);
if (pos != NULL)
while (pos[0] == ' ')
pos++;

24
src/udev/udev-rules.c
View File

@ -718,6 +718,7 @@ static void attr_subst_subdir(char *attr, size_t len) {
static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value) {
char *linepos;
char *temp;
unsigned i, j;
linepos = *line;
if (linepos == NULL || linepos[0] == '\0')
@ -793,14 +794,25 @@ static int get_key(struct udev *udev, char **line, char **key, enum operation_ty
*value = linepos;
/* terminate */
temp = strchr(linepos, '"');
if (!temp)
return -1;
temp[0] = '\0';
temp++;
for (i = 0, j = 0; ; i++, j++) {
if (linepos[i] == '"')
break;
if (linepos[i] == '\0')
return -1;
/* double quotes can be escaped */
if (linepos[i] == '\\')
if (linepos[i+1] == '"')
i++;
linepos[j] = linepos[i];
}
linepos[j] = '\0';
/* move line to next key */
*line = temp;
*line = linepos + i + 1;
return 0;
}

24
test/udev-test.pl
View File

@ -330,6 +330,30 @@ EOF
exp_name => "foo7" ,
rules => <<EOF
SUBSYSTEMS=="scsi", PROGRAM=="/bin/echo -n 'foo3 foo4' 'foo5 foo6 foo7 foo8'", KERNEL=="sda5", SYMLINK+="%c{5}"
EOF
},
{
desc => "program arguments combined with escaped double quotes, part 1",
devpath => "/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5",
exp_name => "foo2" ,
rules => <<EOF
SUBSYSTEMS=="scsi", PROGRAM=="/bin/sh -c 'printf %%s \\\"foo1 foo2\\\" | grep \\\"foo1 foo2\\\"'", KERNEL=="sda5", SYMLINK+="%c{2}"
EOF
},
{
desc => "program arguments combined with escaped double quotes, part 2",
devpath => "/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5",
exp_name => "foo2" ,
rules => <<EOF
SUBSYSTEMS=="scsi", PROGRAM=="/bin/sh -c \\\"printf %%s 'foo1 foo2' | grep 'foo1 foo2'\\\"", KERNEL=="sda5", SYMLINK+="%c{2}"
EOF
},
{
desc => "program arguments combined with escaped double quotes, part 3",
devpath => "/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5",
exp_name => "foo2" ,
rules => <<EOF
SUBSYSTEMS=="scsi", PROGRAM=="/bin/sh -c 'printf \\\"%%s %%s\\\" \\\"foo1 foo2\\\" \\\"foo3\\\"| grep \\\"foo1 foo2\\\"'", KERNEL=="sda5", SYMLINK+="%c{2}"
EOF
},
{