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Message-Id: <1424161226-15176-8-git-send-email-avagin@openvz.org>
Date: Tue, 17 Feb 2015 11:20:26 +0300
From: Andrey Vagin <avagin@...nvz.org>
To: linux-kernel@...r.kernel.org
Cc: linux-api@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Cyrill Gorcunov <gorcunov@...nvz.org>,
Pavel Emelyanov <xemul@...allels.com>,
Roger Luethi <rl@...lgate.ch>, Andrey Vagin <avagin@...nvz.org>
Subject: [PATCH 7/7] selftest: check the task_diag functinonality
Here are two test (example) programs.
task_diag - request information for two processes.
test_diag_all - request information about all processes
Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/task_diag/Makefile | 16 ++
tools/testing/selftests/task_diag/task_diag.c | 56 ++++++
tools/testing/selftests/task_diag/task_diag_all.c | 82 ++++++++
tools/testing/selftests/task_diag/task_diag_comm.c | 206 +++++++++++++++++++++
tools/testing/selftests/task_diag/task_diag_comm.h | 47 +++++
tools/testing/selftests/task_diag/taskdiag.h | 1 +
7 files changed, 409 insertions(+)
create mode 100644 tools/testing/selftests/task_diag/Makefile
create mode 100644 tools/testing/selftests/task_diag/task_diag.c
create mode 100644 tools/testing/selftests/task_diag/task_diag_all.c
create mode 100644 tools/testing/selftests/task_diag/task_diag_comm.c
create mode 100644 tools/testing/selftests/task_diag/task_diag_comm.h
create mode 120000 tools/testing/selftests/task_diag/taskdiag.h
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 4e51122..c73d888 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -17,6 +17,7 @@ TARGETS += sysctl
TARGETS += timers
TARGETS += user
TARGETS += vm
+TARGETS += task_diag
#Please keep the TARGETS list alphabetically sorted
TARGETS_HOTPLUG = cpu-hotplug
diff --git a/tools/testing/selftests/task_diag/Makefile b/tools/testing/selftests/task_diag/Makefile
new file mode 100644
index 0000000..d6583c4
--- /dev/null
+++ b/tools/testing/selftests/task_diag/Makefile
@@ -0,0 +1,16 @@
+all: task_diag task_diag_all
+
+run_tests: all
+ @./task_diag && ./task_diag_all && echo "task_diag: [PASS]" || echo "task_diag: [FAIL]"
+
+CFLAGS += -Wall -O2
+
+task_diag.o: task_diag.c task_diag_comm.h
+task_diag_all.o: task_diag_all.c task_diag_comm.h
+task_diag_comm.o: task_diag_comm.c task_diag_comm.h
+
+task_diag_all: task_diag_all.o task_diag_comm.o
+task_diag: task_diag.o task_diag_comm.o
+
+clean:
+ rm -rf task_diag task_diag_all task_diag_comm.o task_diag_all.o task_diag.o
diff --git a/tools/testing/selftests/task_diag/task_diag.c b/tools/testing/selftests/task_diag/task_diag.c
new file mode 100644
index 0000000..fafeeac
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <poll.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+#include <linux/genetlink.h>
+#include "taskdiag.h"
+#include "task_diag_comm.h"
+
+int main(int argc, char *argv[])
+{
+ int exit_status = 1;
+ int rc, rep_len, id;
+ int nl_sd = -1;
+ struct task_diag_pid req;
+ char buf[4096];
+
+ req.show_flags = TASK_DIAG_SHOW_CRED;
+ req.pid = getpid();
+
+ nl_sd = create_nl_socket(NETLINK_GENERIC);
+ if (nl_sd < 0)
+ return -1;
+
+ id = get_family_id(nl_sd);
+ if (!id)
+ goto err;
+
+ rc = send_cmd(nl_sd, id, getpid(), TASKDIAG_CMD_GET,
+ TASKDIAG_CMD_ATTR_GET, &req, sizeof(req), 0);
+ pr_info("Sent pid/tgid, retval %d\n", rc);
+ if (rc < 0)
+ goto err;
+
+ rep_len = recv(nl_sd, buf, sizeof(buf), 0);
+ if (rep_len < 0) {
+ pr_perror("Unable to receive a response\n");
+ goto err;
+ }
+ pr_info("received %d bytes\n", rep_len);
+
+ nlmsg_receive(buf, rep_len, &show_task);
+
+ exit_status = 0;
+err:
+ close(nl_sd);
+ return exit_status;
+}
diff --git a/tools/testing/selftests/task_diag/task_diag_all.c b/tools/testing/selftests/task_diag/task_diag_all.c
new file mode 100644
index 0000000..85e1a0a
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag_all.c
@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <poll.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+#include "task_diag_comm.h"
+#include "taskdiag.h"
+
+int tasks;
+
+
+extern int _show_task(struct nlmsghdr *hdr)
+{
+ tasks++;
+ return show_task(hdr);
+}
+
+int main(int argc, char *argv[])
+{
+ int exit_status = 1;
+ int rc, rep_len, id;
+ int nl_sd = -1;
+ struct {
+ struct task_diag_pid req;
+ } pid_req;
+ char buf[4096];
+
+ quiet = 0;
+
+ pid_req.req.show_flags = 0;
+ pid_req.req.dump_stratagy = TASK_DIAG_DUMP_ALL;
+ pid_req.req.pid = 1;
+
+ nl_sd = create_nl_socket(NETLINK_GENERIC);
+ if (nl_sd < 0)
+ return -1;
+
+ id = get_family_id(nl_sd);
+ if (!id)
+ goto err;
+
+ rc = send_cmd(nl_sd, id, getpid(), TASKDIAG_CMD_GET,
+ TASKDIAG_CMD_ATTR_GET, &pid_req, sizeof(pid_req), 1);
+ pr_info("Sent pid/tgid, retval %d\n", rc);
+ if (rc < 0)
+ goto err;
+
+ while (1) {
+ int err;
+
+ rep_len = recv(nl_sd, buf, sizeof(buf), 0);
+ pr_info("received %d bytes\n", rep_len);
+
+ if (rep_len < 0) {
+ pr_perror("Unable to receive a response\n");
+ goto err;
+ }
+
+ if (rep_len == 0)
+ break;
+
+ err = nlmsg_receive(buf, rep_len, &_show_task);
+ if (err < 0)
+ goto err;
+ if (err == 0)
+ break;
+ }
+ printf("tasks: %d\n", tasks);
+
+ exit_status = 0;
+err:
+ close(nl_sd);
+ return exit_status;
+}
diff --git a/tools/testing/selftests/task_diag/task_diag_comm.c b/tools/testing/selftests/task_diag/task_diag_comm.c
new file mode 100644
index 0000000..df7780d
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag_comm.c
@@ -0,0 +1,206 @@
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/genetlink.h>
+
+#include "taskdiag.h"
+#include "task_diag_comm.h"
+
+int quiet = 0;
+
+/*
+ * Create a raw netlink socket and bind
+ */
+int create_nl_socket(int protocol)
+{
+ int fd;
+ struct sockaddr_nl local;
+
+ fd = socket(AF_NETLINK, SOCK_RAW, protocol);
+ if (fd < 0)
+ return -1;
+
+ memset(&local, 0, sizeof(local));
+ local.nl_family = AF_NETLINK;
+
+ if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
+ goto error;
+
+ return fd;
+error:
+ close(fd);
+ return -1;
+}
+
+
+int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
+ __u8 genl_cmd, __u16 nla_type,
+ void *nla_data, int nla_len, int dump)
+{
+ struct nlattr *na;
+ struct sockaddr_nl nladdr;
+ int r, buflen;
+ char *buf;
+
+ struct msgtemplate msg;
+
+ msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
+ msg.n.nlmsg_type = nlmsg_type;
+ msg.n.nlmsg_flags = NLM_F_REQUEST;
+ if (dump)
+ msg.n.nlmsg_flags |= NLM_F_DUMP;
+ msg.n.nlmsg_seq = 0;
+ msg.n.nlmsg_pid = nlmsg_pid;
+ msg.g.cmd = genl_cmd;
+ msg.g.version = 0x1;
+ na = (struct nlattr *) GENLMSG_DATA(&msg);
+ na->nla_type = nla_type;
+ na->nla_len = nla_len + 1 + NLA_HDRLEN;
+ memcpy(NLA_DATA(na), nla_data, nla_len);
+ msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
+
+ buf = (char *) &msg;
+ buflen = msg.n.nlmsg_len;
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+ r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
+ sizeof(nladdr));
+ if (r != buflen) {
+ pr_perror("Unable to send %d (%d)", r, buflen);
+ return -1;
+ }
+ return 0;
+}
+
+
+/*
+ * Probe the controller in genetlink to find the family id
+ * for the TASKDIAG family
+ */
+int get_family_id(int sd)
+{
+ char name[100];
+ struct msgtemplate ans;
+
+ int id = 0, rc;
+ struct nlattr *na;
+ int rep_len;
+
+ strcpy(name, TASKDIAG_GENL_NAME);
+ rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
+ CTRL_ATTR_FAMILY_NAME, (void *)name,
+ strlen(TASKDIAG_GENL_NAME) + 1, 0);
+ if (rc < 0)
+ return -1;
+
+ rep_len = recv(sd, &ans, sizeof(ans), 0);
+ if (ans.n.nlmsg_type == NLMSG_ERROR ||
+ (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
+ return 0;
+
+ na = (struct nlattr *) GENLMSG_DATA(&ans);
+ na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
+ if (na->nla_type == CTRL_ATTR_FAMILY_ID)
+ id = *(__u16 *) NLA_DATA(na);
+
+ return id;
+}
+
+int nlmsg_receive(void *buf, int len, int (*cb)(struct nlmsghdr *))
+{
+ struct nlmsghdr *hdr;
+
+ for (hdr = (struct nlmsghdr *)buf;
+ NLMSG_OK(hdr, len); hdr = NLMSG_NEXT(hdr, len)) {
+
+ if (hdr->nlmsg_type == NLMSG_DONE) {
+ int *len = (int *)NLMSG_DATA(hdr);
+
+ if (*len < 0) {
+ pr_err("ERROR %d reported by netlink (%s)\n",
+ *len, strerror(-*len));
+ return *len;
+ }
+
+ return 0;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+
+ if (hdr->nlmsg_len - sizeof(*hdr) < sizeof(struct nlmsgerr)) {
+ pr_err("ERROR truncated\n");
+ return -1;
+ }
+
+ if (err->error == 0)
+ return 0;
+
+ return -1;
+ }
+ if (cb && cb(hdr))
+ return -1;
+ }
+
+ return 1;
+}
+
+int show_task(struct nlmsghdr *hdr)
+{
+ int msg_len;
+ struct msgtemplate *msg;
+ struct nlattr *na;
+ int len;
+
+ msg_len = GENLMSG_PAYLOAD(hdr);
+
+ msg = (struct msgtemplate *)hdr;
+ na = (struct nlattr *) GENLMSG_DATA(msg);
+ len = 0;
+ while (len < msg_len) {
+ len += NLA_ALIGN(na->nla_len);
+ switch (na->nla_type) {
+ case TASK_DIAG_MSG:
+ {
+ struct task_diag_msg *msg;
+
+ /* For nested attributes, na follows */
+ msg = (struct task_diag_msg *) NLA_DATA(na);
+ pr_info("pid %d ppid %d comm %s\n", msg->pid, msg->ppid, msg->comm);
+ break;
+ }
+ case TASK_DIAG_CRED:
+ {
+ struct task_diag_creds *creds;
+
+ creds = (struct task_diag_creds *) NLA_DATA(na);
+ pr_info("uid: %d %d %d %d\n", creds->uid,
+ creds->euid, creds->suid, creds->fsuid);
+ pr_info("gid: %d %d %d %d\n", creds->uid,
+ creds->euid, creds->suid, creds->fsuid);
+ pr_info("CapInh: %08x%08x\n",
+ creds->cap_inheritable.cap[1],
+ creds->cap_inheritable.cap[0]);
+ pr_info("CapPrm: %08x%08x\n",
+ creds->cap_permitted.cap[1],
+ creds->cap_permitted.cap[0]);
+ pr_info("CapEff: %08x%08x\n",
+ creds->cap_effective.cap[1],
+ creds->cap_effective.cap[0]);
+ pr_info("CapBnd: %08x%08x\n", creds->cap_bset.cap[1],
+ creds->cap_bset.cap[0]);
+ break;
+ }
+ default:
+ pr_err("Unknown nla_type %d\n",
+ na->nla_type);
+ return -1;
+ }
+ na = (struct nlattr *) (GENLMSG_DATA(msg) + len);
+ }
+
+ return 0;
+}
diff --git a/tools/testing/selftests/task_diag/task_diag_comm.h b/tools/testing/selftests/task_diag/task_diag_comm.h
new file mode 100644
index 0000000..42f2088
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag_comm.h
@@ -0,0 +1,47 @@
+#ifndef __TASK_DIAG_COMM__
+#define __TASK_DIAG_COMM__
+
+#include <stdio.h>
+
+#include <linux/genetlink.h>
+#include "taskdiag.h"
+
+/*
+ * Generic macros for dealing with netlink sockets. Might be duplicated
+ * elsewhere. It is recommended that commercial grade applications use
+ * libnl or libnetlink and use the interfaces provided by the library
+ */
+#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
+#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
+#define NLA_DATA(na) ((void *)((char *)(na) + NLA_HDRLEN))
+#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
+
+#define pr_err(fmt, ...) \
+ fprintf(stderr, fmt, ##__VA_ARGS__)
+
+#define pr_perror(fmt, ...) \
+ fprintf(stderr, fmt " : %m\n", ##__VA_ARGS__)
+
+extern int quiet;
+#define pr_info(fmt, arg...) \
+ do { \
+ if (!quiet) \
+ printf(fmt, ##arg); \
+ } while (0) \
+
+struct msgtemplate {
+ struct nlmsghdr n;
+ struct genlmsghdr g;
+ char body[4096];
+};
+
+extern int create_nl_socket(int protocol);
+extern int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
+ __u8 genl_cmd, __u16 nla_type,
+ void *nla_data, int nla_len, int dump);
+
+extern int get_family_id(int sd);
+extern int nlmsg_receive(void *buf, int len, int (*cb)(struct nlmsghdr *));
+extern int show_task(struct nlmsghdr *hdr);
+
+#endif /* __TASK_DIAG_COMM__ */
diff --git a/tools/testing/selftests/task_diag/taskdiag.h b/tools/testing/selftests/task_diag/taskdiag.h
new file mode 120000
index 0000000..83e857e
--- /dev/null
+++ b/tools/testing/selftests/task_diag/taskdiag.h
@@ -0,0 +1 @@
+../../../../include/uapi/linux/taskdiag.h
\ No newline at end of file
--
2.1.0
--
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