mdev: fix a bug where it was not stopping on first matching rule
(testsuite entry added). Revamped line parsing while at it. function old new delta next_field - 36 +36 make_device 1104 1022 -82 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/1 up/down: 36/-82) Total: -46 bytes
This commit is contained in:
Denis Vlasenko
parent
7cb808e1c5
commit
4461564c77
@ -6,8 +6,8 @@
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# ls -ln is showing date. Need to remove that, it's variable
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# sed: (1) "maj, min" -> "maj,min" (2) coalesce spaces
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# cut: remove user, group, and date
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FILTER_LS="sed -e 's/, */,/g' -e 's/ */ /g' | cut -d' ' -f 1,2,5,9-"
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# cut: remove date
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FILTER_LS="sed -e 's/, */,/g' -e 's/ */ /g' | cut -d' ' -f 1-5,9-"
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# testing "test name" "options" "expected result" "file input" "stdin"
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@ -16,6 +16,7 @@ mkdir mdev.testdir
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# We need mdev executable to be in chroot jail!
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# (will still fail with dynamically linked one, though...)
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cp ../busybox mdev.testdir/mdev
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mkdir mdev.testdir/etc
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mkdir mdev.testdir/dev
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mkdir -p mdev.testdir/sys/block/sda
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echo "8:0" >mdev.testdir/sys/block/sda/dev
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@ -25,7 +26,19 @@ testing "mdev add /block/sda" \
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ls -ln mdev.testdir/dev | $FILTER_LS" \
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"\
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mdev: /etc/mdev.conf: No such file or directory
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brw-rw---- 1 8,0 sda
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brw-rw---- 1 0 0 8,0 sda
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" \
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"" ""
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# continuing to use directory structure from prev test
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rm mdev.testdir/dev/sda
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echo ".* 1:1 666" >mdev.testdir/etc/mdev.conf
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echo "sda 2:2 444" >>mdev.testdir/etc/mdev.conf
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testing "mdev stops on first rule" \
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"env - ACTION=add DEVPATH=/block/sda chroot mdev.testdir /mdev 2>&1;
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ls -ln mdev.testdir/dev | $FILTER_LS" \
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"\
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brw-rw-rw- 1 1 1 8,0 sda
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" \
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"" ""
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@ -24,6 +24,16 @@ struct globals {
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/* We use additional 64+ bytes in make_device() */
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#define SCRATCH_SIZE 80
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static char *next_field(char *s)
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{
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char *end = skip_non_whitespace(s);
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s = skip_whitespace(end);
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*end = '\0';
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if (*s == '\0')
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s = NULL;
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return s;
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}
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/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
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/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
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static void make_device(char *path, int delete)
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@ -63,135 +73,115 @@ static void make_device(char *path, int delete)
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if (ENABLE_FEATURE_MDEV_CONF) {
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FILE *fp;
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char *line, *vline;
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char *line, *val, *next;
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unsigned lineno = 0;
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/* If we have a config file, look up the user settings */
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/* If we have config file, look up user settings */
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fp = fopen_or_warn("/etc/mdev.conf", "r");
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if (!fp)
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goto end_parse;
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while ((vline = line = xmalloc_fgetline(fp)) != NULL) {
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int field;
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char *orig_line;
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if (ENABLE_FEATURE_MDEV_EXEC)
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orig_line = xstrdup(line); /* pristine copy for command execution. */
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while ((line = xmalloc_fgetline(fp)) != NULL) {
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++lineno;
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// TODO: get rid of loop,
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// just linear skip_whitespace() style code will do!
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// (will also get rid of orig_line).
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trim(line);
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if (!line[0])
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goto next_line;
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/* Fields: regex uid:gid mode [alias] [cmd] */
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for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_RENAME + ENABLE_FEATURE_MDEV_EXEC); ++field) {
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/* Find a non-empty field */
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char *val;
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do {
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val = strtok(vline, " \t");
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vline = NULL;
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} while (val && !*val);
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if (!val) {
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if (field)
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break;
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else
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goto next_line;
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}
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/* 1st field: regex to match this device */
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next = next_field(line);
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{
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regex_t match;
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regmatch_t off;
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int result;
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if (field == 0) {
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/* Is this it? */
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xregcomp(&match, line, REG_EXTENDED);
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result = regexec(&match, device_name, 1, &off, 0);
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regfree(&match);
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/* Regex to match this device */
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regex_t match;
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regmatch_t off;
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int result;
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/* If not this device, skip rest of line */
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if (result || off.rm_so || off.rm_eo != strlen(device_name))
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goto next_line;
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}
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/* Is this it? */
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xregcomp(&match, val, REG_EXTENDED);
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result = regexec(&match, device_name, 1, &off, 0);
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regfree(&match);
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/* This line matches: stop parsing the file
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* after parsing the rest of fields */
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/* If not this device, skip rest of line */
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if (result || off.rm_so || off.rm_eo != strlen(device_name))
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goto next_line;
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} else if (field == 1) {
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/* uid:gid device ownership */
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struct passwd *pass;
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struct group *grp;
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char *str_uid = val;
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char *str_gid = strchrnul(val, ':');
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if (*str_gid)
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*str_gid++ = '\0';
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/* Parse UID */
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pass = getpwnam(str_uid);
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if (pass)
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uid = pass->pw_uid;
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else
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uid = strtoul(str_uid, NULL, 10);
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/* Parse GID */
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grp = getgrnam(str_gid);
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if (grp)
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gid = grp->gr_gid;
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else
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gid = strtoul(str_gid, NULL, 10);
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} else if (field == 2) {
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/* Mode device permissions */
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mode = strtoul(val, NULL, 8);
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} else if (ENABLE_FEATURE_MDEV_RENAME && field == 3) {
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if (*val != '>')
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++field;
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else {
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free(alias); /* don't leak in case we matched it on prev line */
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alias = xstrdup(val + 1);
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}
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}
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if (ENABLE_FEATURE_MDEV_EXEC && field == 3 + ENABLE_FEATURE_MDEV_RENAME) {
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/* Optional command to run */
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const char *s = "@$*";
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const char *s2 = strchr(s, *val);
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if (!s2) {
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/* Force error */
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field = 1;
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break;
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}
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/* Correlate the position in the "@$*" with the delete
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* step so that we get the proper behavior:
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* @cmd: run on create
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* $cmd: run on delete
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* *cmd: run on both
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*/
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if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
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free(command); /* don't leak in case we matched it on prev line */
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command = xstrdup(orig_line + (val + 1 - line));
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}
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}
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} /* end of "for every field" */
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/* Did everything parse happily? */
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if (field <= 2)
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/* 2nd field: uid:gid - device ownership */
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if (!next) /* field must exist */
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bb_error_msg_and_die("bad line %u", lineno);
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val = next;
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next = next_field(val);
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{
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struct passwd *pass;
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struct group *grp;
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char *str_uid = val;
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char *str_gid = strchrnul(val, ':');
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if (*str_gid)
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*str_gid++ = '\0';
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/* Parse UID */
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pass = getpwnam(str_uid);
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if (pass)
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uid = pass->pw_uid;
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else
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uid = strtoul(str_uid, NULL, 10);
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/* Parse GID */
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grp = getgrnam(str_gid);
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if (grp)
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gid = grp->gr_gid;
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else
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gid = strtoul(str_gid, NULL, 10);
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}
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/* 3rd field: mode - device permissions */
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if (!next) /* field must exist */
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bb_error_msg_and_die("bad line %u", lineno);
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val = next;
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next = next_field(val);
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mode = strtoul(val, NULL, 8);
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/* 4th field (opt): >alias */
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if (ENABLE_FEATURE_MDEV_RENAME) {
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if (!next)
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break;
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val = next;
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next = next_field(val);
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if (*val == '>') {
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alias = xstrdup(val + 1);
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}
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}
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/* The rest (opt): command to run */
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if (!next)
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break;
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val = next;
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if (ENABLE_FEATURE_MDEV_EXEC) {
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const char *s = "@$*";
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const char *s2 = strchr(s, *val);
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if (!s2)
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bb_error_msg_and_die("bad line %u", lineno);
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/* Correlate the position in the "@$*" with the delete
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* step so that we get the proper behavior:
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* @cmd: run on create
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* $cmd: run on delete
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* *cmd: run on both
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*/
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if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
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command = xstrdup(val + 1);
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}
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}
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/* end of field parsing */
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break; /* we found matching line, stop */
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next_line:
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free(line);
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if (ENABLE_FEATURE_MDEV_EXEC)
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free(orig_line);
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} /* end of "while line is read from /etc/mdev.conf" */
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free(line); /* in case we used "break" to get here */
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fclose(fp);
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}
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end_parse:
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