From e98c6961c82e25ff9051a31f17846404a64de6dd Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Fri, 31 Mar 2017 10:27:30 -0500 Subject: [PATCH] rbd: Fix regression in legacy key/values containing escaped : Commit c7cacb3 accidentally broke legacy key-value parsing through pseudo-filename parsing of -drive file=rbd://..., for any key that contains an escaped ':'. Such a key is surprisingly common, thanks to mon_host specifying a 'host:port' string. The break happens because passing things from QDict through QemuOpts back to another QDict requires that we pack our parsed key/value pairs into a string, and then reparse that string, but the intermediate string that we created ("key1=value1:key2=value2") lost the \: escaping that was present in the original, so that we could no longer see which : were used as separators vs. those used as part of the original input. Fix it by collecting the key/value pairs through a QList, and sending that list on a round trip through a JSON QString (as in '["key1","value1","key2","value2"]') on its way through QemuOpts, rather than hand-rolling our own string. Since the string is only handled internally, this was faster than creating a full-blown struct of '[{"key1":"value1"},{"key2":"value2"}]', and safer at guaranteeing order compared to '{"key1":"value1","key2":"value2"}'. It would be nicer if we didn't have to round-trip through QemuOpts in the first place, but that's a much bigger task for later. Reproducer: ./x86_64-softmmu/qemu-system-x86_64 -nodefaults -nographic -qmp stdio \ -drive 'file=rbd:volumes/volume-ea141b5c-cdb3-4765-910d-e7008b209a70'\ ':id=compute:key=AQAVkvxXAAAAABAA9ZxWFYdRmV+DSwKr7BKKXg=='\ ':auth_supported=cephx\;none:mon_host=192.168.1.2\:6789'\ ',format=raw,if=none,id=drive-virtio-disk0,'\ 'serial=ea141b5c-cdb3-4765-910d-e7008b209a70,cache=writeback' Even without an RBD setup, this serves a test of whether we get the incorrect parser error of: qemu-system-x86_64: -drive file=rbd:...cache=writeback: conf option 6789 has no value or the correct behavior of hanging while trying to connect to the requested mon_host of 192.168.1.2:6789. Reported-by: Alexandru Avadanii Signed-off-by: Eric Blake Reviewed-by: Jeff Cody Reviewed-by: Max Reitz Message-id: 20170331152730.12514-1-eblake@redhat.com Signed-off-by: Jeff Cody --- block/rbd.c | 83 +++++++++++++++++++++++++++-------------------------- 1 file changed, 42 insertions(+), 41 deletions(-) diff --git a/block/rbd.c b/block/rbd.c index 498322b30b..fbdb131a68 100644 --- a/block/rbd.c +++ b/block/rbd.c @@ -20,6 +20,7 @@ #include "crypto/secret.h" #include "qemu/cutils.h" #include "qapi/qmp/qstring.h" +#include "qapi/qmp/qjson.h" /* * When specifying the image filename use: @@ -135,18 +136,16 @@ static void qemu_rbd_parse_filename(const char *filename, QDict *options, Error **errp) { const char *start; - char *p, *buf, *keypairs; + char *p, *buf; + QList *keypairs = NULL; char *found_str; - size_t max_keypair_size; if (!strstart(filename, "rbd:", &start)) { error_setg(errp, "File name must start with 'rbd:'"); return; } - max_keypair_size = strlen(start) + 1; buf = g_strdup(start); - keypairs = g_malloc0(max_keypair_size); p = buf; found_str = qemu_rbd_next_tok(p, '/', &p); @@ -194,33 +193,30 @@ static void qemu_rbd_parse_filename(const char *filename, QDict *options, } else if (!strcmp(name, "id")) { qdict_put(options, "user" , qstring_from_str(value)); } else { - /* FIXME: This is pretty ugly, and not the right way to do this. - * These should be contained in a structure, and then - * passed explicitly as individual key/value pairs to - * rados. Consider this legacy code that needs to be - * updated. */ - char *tmp = g_malloc0(max_keypair_size); - /* only use a delimiter if it is not the first keypair found */ - /* These are sets of unknown key/value pairs we'll pass along - * to ceph */ - if (keypairs[0]) { - snprintf(tmp, max_keypair_size, ":%s=%s", name, value); - pstrcat(keypairs, max_keypair_size, tmp); - } else { - snprintf(keypairs, max_keypair_size, "%s=%s", name, value); + /* + * We pass these internally to qemu_rbd_set_keypairs(), so + * we can get away with the simpler list of [ "key1", + * "value1", "key2", "value2" ] rather than a raw dict + * { "key1": "value1", "key2": "value2" } where we can't + * guarantee order, or even a more correct but complex + * [ { "key1": "value1" }, { "key2": "value2" } ] + */ + if (!keypairs) { + keypairs = qlist_new(); } - g_free(tmp); + qlist_append(keypairs, qstring_from_str(name)); + qlist_append(keypairs, qstring_from_str(value)); } } - if (keypairs[0]) { - qdict_put(options, "=keyvalue-pairs", qstring_from_str(keypairs)); + if (keypairs) { + qdict_put(options, "=keyvalue-pairs", + qobject_to_json(QOBJECT(keypairs))); } - done: g_free(buf); - g_free(keypairs); + QDECREF(keypairs); return; } @@ -244,36 +240,41 @@ static int qemu_rbd_set_auth(rados_t cluster, const char *secretid, return 0; } -static int qemu_rbd_set_keypairs(rados_t cluster, const char *keypairs, +static int qemu_rbd_set_keypairs(rados_t cluster, const char *keypairs_json, Error **errp) { - char *p, *buf; - char *name; - char *value; + QList *keypairs; + QString *name; + QString *value; + const char *key; + size_t remaining; int ret = 0; - buf = g_strdup(keypairs); - p = buf; + if (!keypairs_json) { + return ret; + } + keypairs = qobject_to_qlist(qobject_from_json(keypairs_json, + &error_abort)); + remaining = qlist_size(keypairs) / 2; + assert(remaining); - while (p) { - name = qemu_rbd_next_tok(p, '=', &p); - if (!p) { - error_setg(errp, "conf option %s has no value", name); - ret = -EINVAL; - break; - } + while (remaining--) { + name = qobject_to_qstring(qlist_pop(keypairs)); + value = qobject_to_qstring(qlist_pop(keypairs)); + assert(name && value); + key = qstring_get_str(name); - value = qemu_rbd_next_tok(p, ':', &p); - - ret = rados_conf_set(cluster, name, value); + ret = rados_conf_set(cluster, key, qstring_get_str(value)); + QDECREF(name); + QDECREF(value); if (ret < 0) { - error_setg_errno(errp, -ret, "invalid conf option %s", name); + error_setg_errno(errp, -ret, "invalid conf option %s", key); ret = -EINVAL; break; } } - g_free(buf); + QDECREF(keypairs); return ret; }