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Diffstat (limited to 'tests/qtest/libqmp.c')
| -rw-r--r-- | tests/qtest/libqmp.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/tests/qtest/libqmp.c b/tests/qtest/libqmp.c new file mode 100644 index 0000000000..0358b8313d --- /dev/null +++ b/tests/qtest/libqmp.c @@ -0,0 +1,233 @@ +/* + * QTest + * + * Copyright IBM, Corp. 2012 + * Copyright Red Hat, Inc. 2012 + * Copyright SUSE LINUX Products GmbH 2013 + * + * Authors: + * Anthony Liguori <aliguori@us.ibm.com> + * Paolo Bonzini <pbonzini@redhat.com> + * Andreas Färber <afaerber@suse.de> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "libqmp.h" + +#include "qapi/error.h" +#include "qapi/qmp/json-parser.h" +#include "qapi/qmp/qjson.h" + +#define SOCKET_MAX_FDS 16 + +typedef struct { + JSONMessageParser parser; + QDict *response; +} QMPResponseParser; + +static void socket_send(int fd, const char *buf, size_t size) +{ + size_t res = qemu_write_full(fd, buf, size); + + assert(res == size); +} + +static void qmp_response(void *opaque, QObject *obj, Error *err) +{ + QMPResponseParser *qmp = opaque; + + assert(!obj != !err); + + if (err) { + error_prepend(&err, "QMP JSON response parsing failed: "); + error_report_err(err); + abort(); + } + + g_assert(!qmp->response); + qmp->response = qobject_to(QDict, obj); + g_assert(qmp->response); +} + +QDict *qmp_fd_receive(int fd) +{ + QMPResponseParser qmp; + bool log = getenv("QTEST_LOG") != NULL; + + qmp.response = NULL; + json_message_parser_init(&qmp.parser, qmp_response, &qmp, NULL); + while (!qmp.response) { + ssize_t len; + char c; + + len = read(fd, &c, 1); + if (len == -1 && errno == EINTR) { + continue; + } + + if (len == -1 || len == 0) { + fprintf(stderr, "Broken pipe\n"); + abort(); + } + + if (log) { + g_assert(write(2, &c, 1) == 1); + } + json_message_parser_feed(&qmp.parser, &c, 1); + } + if (log) { + g_assert(write(2, "\n", 1) == 1); + } + json_message_parser_destroy(&qmp.parser); + + return qmp.response; +} + +/* Sends a message and file descriptors to the socket. + * It's needed for qmp-commands like getfd/add-fd */ +static void socket_send_fds(int socket_fd, int *fds, size_t fds_num, + const char *buf, size_t buf_size) +{ + ssize_t ret; + struct msghdr msg = { 0 }; + char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)] = { 0 }; + size_t fdsize = sizeof(int) * fds_num; + struct cmsghdr *cmsg; + struct iovec iov = { .iov_base = (char *)buf, .iov_len = buf_size }; + + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + + if (fds && fds_num > 0) { + g_assert_cmpuint(fds_num, <, SOCKET_MAX_FDS); + + msg.msg_control = control; + msg.msg_controllen = CMSG_SPACE(fdsize); + + cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_len = CMSG_LEN(fdsize); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + memcpy(CMSG_DATA(cmsg), fds, fdsize); + } + + do { + ret = sendmsg(socket_fd, &msg, 0); + } while (ret < 0 && errno == EINTR); + g_assert_cmpint(ret, >, 0); +} + +/** + * Allow users to send a message without waiting for the reply, + * in the case that they choose to discard all replies up until + * a particular EVENT is received. + */ +void qmp_fd_vsend_fds(int fd, int *fds, size_t fds_num, + const char *fmt, va_list ap) +{ + QObject *qobj; + + /* Going through qobject ensures we escape strings properly */ + qobj = qobject_from_vjsonf_nofail(fmt, ap); + + /* No need to send anything for an empty QObject. */ + if (qobj) { + int log = getenv("QTEST_LOG") != NULL; + GString *str = qobject_to_json(qobj); + + /* + * BUG: QMP doesn't react to input until it sees a newline, an + * object, or an array. Work-around: give it a newline. + */ + g_string_append_c(str, '\n'); + + if (log) { + fprintf(stderr, "%s", str->str); + } + /* Send QMP request */ + if (fds && fds_num > 0) { + socket_send_fds(fd, fds, fds_num, str->str, str->len); + } else { + socket_send(fd, str->str, str->len); + } + + g_string_free(str, true); + qobject_unref(qobj); + } +} + +void qmp_fd_vsend(int fd, const char *fmt, va_list ap) +{ + qmp_fd_vsend_fds(fd, NULL, 0, fmt, ap); +} + + +QDict *qmp_fdv(int fd, const char *fmt, va_list ap) +{ + qmp_fd_vsend_fds(fd, NULL, 0, fmt, ap); + + return qmp_fd_receive(fd); +} + +QDict *qmp_fd(int fd, const char *fmt, ...) +{ + va_list ap; + QDict *response; + + va_start(ap, fmt); + response = qmp_fdv(fd, fmt, ap); + va_end(ap); + return response; +} + +void qmp_fd_send(int fd, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + qmp_fd_vsend(fd, fmt, ap); + va_end(ap); +} + +void qmp_fd_vsend_raw(int fd, const char *fmt, va_list ap) +{ + bool log = getenv("QTEST_LOG") != NULL; + char *str = g_strdup_vprintf(fmt, ap); + + if (log) { + fprintf(stderr, "%s", str); + } + socket_send(fd, str, strlen(str)); + g_free(str); +} + +void qmp_fd_send_raw(int fd, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + qmp_fd_vsend_raw(fd, fmt, ap); + va_end(ap); +} + +bool qmp_rsp_is_err(QDict *rsp) +{ + QDict *error = qdict_get_qdict(rsp, "error"); + qobject_unref(rsp); + return !!error; +} + +void qmp_expect_error_and_unref(QDict *rsp, const char *class) +{ + QDict *error = qdict_get_qdict(rsp, "error"); + + g_assert_cmpstr(qdict_get_try_str(error, "class"), ==, class); + g_assert_nonnull(qdict_get_try_str(error, "desc")); + g_assert(!qdict_haskey(rsp, "return")); + + qobject_unref(rsp); +} |