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9cf89cdf8

Denys Vlasenko
Denys Vlasenko
2017-08-05
SUCCESS Duration: 140s

Subject

sysctl: fix file parsing, do not require -w for VAR=VAL

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No binary (build failed)

Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

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Build Log

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Commit Diff GitHub →

libbb/parse_config.c +5 -5procps/sysctl.c +33 -18testsuite/mdev.tests +2 -2testsuite/parse.tests +37 -7
libbb/parse_config.c+5 -5
@@ -201,10 +201,10 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const
/* Combine remaining arguments? */
if ((t != (ntokens-1)) || !(flags & PARSE_GREEDY)) {
/* Vanilla token, find next delimiter */
- line += strcspn(line, delims[0] ? delims : delims + 1);
+ line += strcspn(line, (delims[0] && (flags & PARSE_EOL_COMMENTS)) ? delims : delims + 1);
} else {
/* Combining, find comment char if any */
- line = strchrnul(line, PARSE_EOL_COMMENTS ? delims[0] : '\0');
+ line = strchrnul(line, (flags & PARSE_EOL_COMMENTS) ? delims[0] : '\0');
/* Trim any extra delimiters from the end */
if (flags & PARSE_TRIM) {
@@ -214,10 +214,10 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const
}
/* Token not terminated? */
- if (*line == delims[0])
- *line = '\0';
+ if ((flags & PARSE_EOL_COMMENTS) && *line == delims[0])
+ *line = '\0'; /* ends with comment char: this line is done */
else if (*line != '\0')
- *line++ = '\0';
+ *line++ = '\0'; /* token is done, continue parsing line */
#if 0 /* unused so far */
if (flags & PARSE_ESCAPE) {
procps/sysctl.c+33 -18
@@ -21,17 +21,17 @@
//kbuild:lib-$(CONFIG_BB_SYSCTL) += sysctl.o
//usage:#define sysctl_trivial_usage
-//usage: "[OPTIONS] [KEY[=VALUE]]..."
+//usage: "-p [-enq] [FILE...] / [-enqaw] [KEY[=VALUE]]..."
//usage:#define sysctl_full_usage "\n\n"
//usage: "Show/set kernel parameters\n"
+//usage: "\n -p Set values from FILEs (default /etc/sysctl.conf)"
//usage: "\n -e Don't warn about unknown keys"
//usage: "\n -n Don't show key names"
+//usage: "\n -q Quiet"
//usage: "\n -a Show all values"
/* Same as -a, no need to show it */
/* //usage: "\n -A Show all values in table form" */
//usage: "\n -w Set values"
-//usage: "\n -p FILE Set values from FILE (default /etc/sysctl.conf)"
-//usage: "\n -q Set values silently"
//usage:
//usage:#define sysctl_example_usage
//usage: "sysctl [-n] [-e] variable...\n"
@@ -48,7 +48,7 @@ enum {
FLAG_TABLE_FORMAT = 1 << 2, /* not implemented */
FLAG_SHOW_ALL = 1 << 3,
FLAG_PRELOAD_FILE = 1 << 4,
-/* TODO: procps 3.2.8 seems to not require -w for KEY=VAL to work: */
+ /* NB: procps 3.2.8 does not require -w for KEY=VAL to work, it only rejects non-KEY=VAL form */
FLAG_WRITE = 1 << 5,
FLAG_QUIET = 1 << 6,
};
@@ -104,6 +104,7 @@ static int sysctl_act_on_setting(char *setting)
int fd, retval = EXIT_SUCCESS;
char *cptr, *outname;
char *value = value; /* for compiler */
+ bool writing = (option_mask32 & FLAG_WRITE);
outname = xstrdup(setting);
@@ -114,8 +115,10 @@ static int sysctl_act_on_setting(char *setting)
cptr++;
}
- if (option_mask32 & FLAG_WRITE) {
- cptr = strchr(setting, '=');
+ cptr = strchr(setting, '=');
+ if (cptr)
+ writing = 1;
+ if (writing) {
if (cptr == NULL) {
bb_error_msg("error: '%s' must be of the form name=value",
outname);
@@ -147,7 +150,7 @@ static int sysctl_act_on_setting(char *setting)
break;
default:
bb_perror_msg("error %sing key '%s'",
- option_mask32 & FLAG_WRITE ?
+ writing ?
"sett" : "read",
outname);
break;
@@ -156,7 +159,7 @@ static int sysctl_act_on_setting(char *setting)
goto end;
}
- if (option_mask32 & FLAG_WRITE) {
+ if (writing) {
//TODO: procps 3.2.7 writes "value\n", note trailing "\n"
xwrite_str(fd, value);
close(fd);
@@ -238,22 +241,27 @@ static int sysctl_handle_preload_file(const char *filename)
{
char *token[2];
parser_t *parser;
+ int parse_flags;
parser = config_open(filename);
/* Must do it _after_ config_open(): */
xchdir("/proc/sys");
- /* xchroot("/proc/sys") - if you are paranoid */
//TODO: ';' is comment char too
-//TODO: comment may be only at line start. "var=1 #abc" - "1 #abc" is the value
-// (but _whitespace_ from ends should be trimmed first (and we do it right))
-//TODO: "var==1" is mishandled (must use "=1" as a value, but uses "1")
-// can it be fixed by removing PARSE_COLLAPSE bit?
- while (config_read(parser, token, 2, 2, "# \t=", PARSE_NORMAL)) {
+//TODO: <space><tab><space>#comment is also comment, not strictly 1st char only
+ parse_flags = 0;
+ parse_flags &= ~PARSE_COLLAPSE; // NO (var==val is not var=val) - treat consecutive delimiters as one
+ parse_flags &= ~PARSE_TRIM; // NO - trim leading and trailing delimiters
+ parse_flags |= PARSE_GREEDY; // YES - last token takes entire remainder of the line
+ parse_flags &= ~PARSE_MIN_DIE; // NO - die if < min tokens found
+ parse_flags &= ~PARSE_EOL_COMMENTS; // NO (only first char) - comments are recognized even if not first char
+ while (config_read(parser, token, 2, 2, "#=", parse_flags)) {
char *tp;
+ trim(token[0]);
+ trim(token[1]);
sysctl_dots_to_slashes(token[0]);
tp = xasprintf("%s=%s", token[0], token[1]);
- sysctl_act_recursive(tp);
+ sysctl_act_on_setting(tp);
free(tp);
}
if (ENABLE_FEATURE_CLEAN_UP)
@@ -273,12 +281,19 @@ int sysctl_main(int argc UNUSED_PARAM, char **argv)
option_mask32 = opt;
if (opt & FLAG_PRELOAD_FILE) {
+ int cur_dir_fd;
option_mask32 |= FLAG_WRITE;
- /* xchdir("/proc/sys") is inside */
- return sysctl_handle_preload_file(*argv ? *argv : "/etc/sysctl.conf");
+ if (!*argv)
+ *--argv = (char*)"/etc/sysctl.conf";
+ cur_dir_fd = xopen(".", O_RDONLY | O_DIRECTORY);
+ do {
+ /* xchdir("/proc/sys") is inside */
+ sysctl_handle_preload_file(*argv);
+ xfchdir(cur_dir_fd); /* files can be relative, must restore cwd */
+ } while (*++argv);
+ return 0; /* procps-ng 3.3.10 does not flag parse errors */
}
xchdir("/proc/sys");
- /* xchroot("/proc/sys") - if you are paranoid */
if (opt & (FLAG_TABLE_FORMAT | FLAG_SHOW_ALL)) {
return sysctl_act_recursive(".");
}
testsuite/mdev.tests+2 -2
@@ -168,7 +168,7 @@ SKIP=
# continuing to use directory structure from prev test
rm -rf mdev.testdir/dev/*
echo "sda 0:0 644 @echo @echo TEST" >mdev.testdir/etc/mdev.conf
-optional STATIC FEATURE_MDEV_CONF FEATURE_MDEV_EXEC FEATURE_LS_RECURSIVE FEATURE_LS_TIMESTAMPS FEATURE_LS_USERNAME FEATURE_SH_IS_ASH ASH_ECHO
+optional STATIC FEATURE_MDEV_CONF FEATURE_MDEV_EXEC FEATURE_LS_RECURSIVE FEATURE_LS_TIMESTAMPS FEATURE_LS_USERNAME SH_IS_ASH ASH_ECHO
testing "mdev command" \
"env - PATH=$PATH ACTION=add DEVPATH=/block/sda chroot mdev.testdir /mdev 2>&1;
ls -lnR mdev.testdir/dev | $FILTER_LS" \
@@ -183,7 +183,7 @@ SKIP=
# continuing to use directory structure from prev test
rm -rf mdev.testdir/dev/*
echo "sda 0:0 644 =block/ @echo @echo TEST:\$MDEV" >mdev.testdir/etc/mdev.conf
-optional STATIC FEATURE_MDEV_CONF FEATURE_MDEV_RENAME FEATURE_MDEV_EXEC FEATURE_LS_RECURSIVE FEATURE_LS_TIMESTAMPS FEATURE_LS_USERNAME FEATURE_SH_IS_ASH
+optional STATIC FEATURE_MDEV_CONF FEATURE_MDEV_RENAME FEATURE_MDEV_EXEC FEATURE_LS_RECURSIVE FEATURE_LS_TIMESTAMPS FEATURE_LS_USERNAME SH_IS_ASH
testing "mdev move and command" \
"env - PATH=$PATH ACTION=add DEVPATH=/block/sda chroot mdev.testdir /mdev 2>&1;
ls -lnR mdev.testdir/dev | $FILTER_LS2" \
testsuite/parse.tests+37 -7
@@ -5,13 +5,13 @@
. ./testing.sh
-COLLAPSE=$(( 0x00010000))
-TRIM=$(( 0x00020000))
-GREEDY=$(( 0x00040000))
-MIN_DIE=$(( 0x00100000))
-KEEP_COPY=$((0x00200000))
-ESCAPE=$(( 0x00400000))
-NORMAL=$(( COLLAPSE | TRIM | GREEDY))
+COLLAPSE=$(( 0x00010000))
+TRIM=$(( 0x00020000))
+GREEDY=$(( 0x00040000))
+MIN_DIE=$(( 0x00100000))
+KEEP_COPY=$(( 0x00200000))
+EOL_COMMENTS=$((0x00400000))
+NORMAL=$(( COLLAPSE | TRIM | GREEDY | EOL_COMMENTS))
# testing "description" "command" "result" "infile" "stdin"
@@ -27,6 +27,34 @@ testing "parse notrim" \
"-" \
" sda 0:0 644 @echo @echo TEST \n"
+testing "parse comments" \
+ "parse -n 4 -m 3 -f $((NORMAL - EOL_COMMENTS)) -" \
+ "[sda][0:0][644][@echo @echo TEST #this is not eaten]\n" \
+ "-" \
+ "\
+# sda 0:0 644 @echo @echo TEST - this gets eaten
+ sda 0:0 644 @echo @echo TEST #this is not eaten
+"
+
+testing "parse bad comment" \
+ "parse -n 2 -m 2 -d '#=' -f $((GREEDY)) - 2>&1" \
+ "\
+[var][val]
+parse: bad line 3: 1 tokens found, 2 needed
+[ #this][ok]
+[ #this][=ok]
+[ #this][=ok=ok=ok=]
+" \
+ "-" \
+ "\
+# this gets eaten
+var=val
+ #this causes error msg
+ #this=ok
+ #this==ok
+ #this==ok=ok=ok=
+"
+
FILE=__parse
cat >$FILE <<EOF
#
@@ -96,6 +124,8 @@ cat >$FILE.res <<EOF
[option][dns][129.219.13.81]
[option][domain][local]
[option][lease][864000]
+[option][msstaticroutes][10.0.0.0/8][10.127.0.1]
+[option][staticroutes][10.0.0.0/8][10.127.0.1,][10.11.12.0/24][10.11.12.1]
[option][0x08][01020304]
EOF