Merge branch 'tracking-gator' into merge-linux-linaro-core-tracking

1 files changed, 324 insertions, 0 deletions

diff --git a/tools/gator/daemon/Setup.cpp b/tools/gator/daemon/Setup.cpp
new file mode 100644
index 00000000000..7dd83ceafcc
--- /dev/null
+++ b/tools/gator/daemon/Setup.cpp
@@ -0,0 +1,324 @@
+/**
+ * Copyright (C) ARM Limited 2014-2015. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "Setup.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "Config.h"
+#include "DynBuf.h"
+#include "Logging.h"
+#include "SessionData.h"
+
+#define GATOR_MSG "gator: "
+#define GATOR_ERROR "gator: error: "
+#define GATOR_CONFIRM "gator: confirm: "
+
+bool getLinuxVersion(int version[3]) {
+	// Check the kernel version
+	struct utsname utsname;
+	if (uname(&utsname) != 0) {
+		logg->logMessage("uname failed");
+		return false;
+	}
+
+	version[0] = 0;
+	version[1] = 0;
+	version[2] = 0;
+
+	int part = 0;
+	char *ch = utsname.release;
+	while (*ch >= '0' && *ch <= '9' && part < 3) {
+		version[part] = 10*version[part] + *ch - '0';
+
+		++ch;
+		if (*ch == '.') {
+			++part;
+			++ch;
+		}
+	}
+
+	return true;
+}
+
+static int pgrep_gator(DynBuf *const printb) {
+	DynBuf b;
+
+	DIR *proc = opendir("/proc");
+	if (proc == NULL) {
+		logg->logError(GATOR_ERROR "opendir failed");
+		handleException();
+	}
+
+	int self = getpid();
+
+	struct dirent *dirent;
+	while ((dirent = readdir(proc)) != NULL) {
+		char *endptr;
+		const int pid = strtol(dirent->d_name, &endptr, 10);
+		if (*endptr != '\0' || (pid == self)) {
+			// Ignore proc items that are not integers like ., cpuinfo, etc...
+			continue;
+		}
+
+		if (!printb->printf("/proc/%i/stat", pid)) {
+			logg->logError(GATOR_ERROR "DynBuf::printf failed");
+			handleException();
+		}
+
+		if (!b.read(printb->getBuf())) {
+			// This is not a fatal error - the thread just doesn't exist any more
+			continue;
+		}
+
+		char *comm = strchr(b.getBuf(), '(');
+		if (comm == NULL) {
+			logg->logError(GATOR_ERROR "parsing stat comm begin failed");
+			handleException();
+		}
+		++comm;
+		char *const str = strrchr(comm, ')');
+		if (str == NULL) {
+			logg->logError(GATOR_ERROR "parsing stat comm end failed");
+			handleException();
+		}
+		*str = '\0';
+
+		if (strncmp(comm, "gator", 5) != 0) {
+			continue;
+		}
+
+		char state;
+		const int count = sscanf(str + 2, " %c ", &state);
+		if (count != 1) {
+			logg->logError(GATOR_ERROR "parsing stat state failed");
+			handleException();
+		}
+
+		if (state == 'Z') {
+			// This gator is a zombie, ignore
+			continue;
+		}
+
+		// Assume there is only one gator process
+		return pid;
+	}
+
+	closedir(proc);
+
+	return -1;
+}
+
+static bool confirm(const char *const message) {
+	char buf[1<<10];
+
+	printf(GATOR_CONFIRM "%s\n", message);
+	while (fgets(buf, sizeof(buf), stdin) != NULL) {
+		if (strcmp(buf, "y\n") == 0) {
+			return true;
+		}
+		if (strcmp(buf, "n\n") == 0) {
+			return false;
+		}
+		// Ignore unrecognized input
+	}
+
+	return false;
+}
+
+void update(const char *const gatorPath) {
+	printf(GATOR_MSG "starting\n");
+
+	int version[3];
+	if (!getLinuxVersion(version)) {
+		logg->logError(GATOR_ERROR "getLinuxVersion failed");
+		handleException();
+	}
+
+	if (KERNEL_VERSION(version[0], version[1], version[2]) < KERNEL_VERSION(2, 6, 32)) {
+		logg->logError(GATOR_ERROR "Streamline can't automatically setup gator as this kernel version is not supported. Please upgrade the kernel on your device.");
+		handleException();
+	}
+
+	if (KERNEL_VERSION(version[0], version[1], version[2]) < KERNEL_VERSION(3, 4, 0)) {
+		logg->logError(GATOR_ERROR "Streamline can't automatically setup gator as gator.ko is required for this version of Linux. Please build gator.ko and gatord and install them on your device.");
+		handleException();
+	}
+
+	if (geteuid() != 0) {
+		printf(GATOR_MSG "trying sudo\n");
+		execlp("sudo", "sudo", gatorPath, "-u", NULL);
+		// Streamline will provide the password if needed
+
+		printf(GATOR_MSG "trying su\n");
+		char buf[1<<10];
+		/*
+		 * Different versions of su handle additional -c command line options differently and expect the
+		 * arguments in different ways. Try both ways wrapped in a shell.
+		 *
+		 * Then invoke another shell after su as it avoids odd failures on some Android systems
+		 */
+		snprintf(buf, sizeof(buf), "su -c \"sh -c '%s -u'\" || su -c sh -c '%s -u'", gatorPath, gatorPath);
+		execlp("sh", "sh", "-c", buf, NULL);
+		// Streamline will provide the password if needed
+
+		logg->logError(GATOR_ERROR "Streamline was unable to sudo to root on your device. Please double check passwords, ensure sudo or su work with this user or try a different username.");
+		handleException();
+	}
+	printf(GATOR_MSG "now root\n");
+
+	if (access("/sys/module/gator", F_OK) == 0) {
+		if (!confirm("Streamline has detected that the gator kernel module is loaded on your device. Click yes to switch to user space gator, click no to abort the install.")) {
+			printf("gator: cancel\n");
+			exit(-1);
+		}
+	}
+
+	// setenforce 0 not needed for userspace gator
+
+	// Kill existing gator
+	DynBuf printb;
+	int gator_main = pgrep_gator(&printb);
+	if (gator_main > 0) {
+		if (kill(gator_main, SIGTERM) != 0) {
+			logg->logError(GATOR_ERROR "kill SIGTERM failed");
+			handleException();
+		}
+		if (!printb.printf("/proc/%i/exe", gator_main)) {
+			logg->logError(GATOR_ERROR "DynBuf::printf failed");
+			handleException();
+		}
+		for (int i = 0; ; ++i) {
+			// /proc/<pid>/exe exists but will not be accessible for zombies
+			if (access(printb.getBuf(), F_OK) != 0) {
+				break;
+			}
+			if (i == 5) {
+				if (kill(gator_main, SIGKILL) != 0) {
+					logg->logError(GATOR_ERROR "kill SIGKILL failed");
+					handleException();
+				}
+			} else if (i >= 10) {
+				logg->logError(GATOR_ERROR "unable to kill running gator");
+				handleException();
+			}
+			sleep(1);
+		}
+	}
+	printf(GATOR_MSG "no gatord running\n");
+
+	umount("/dev/gator");
+	syscall(__NR_delete_module, "gator", O_NONBLOCK);
+
+	rename("gatord", "gatord.old");
+	rename("gator.ko", "gator.ko.old");
+
+	// Rename gatord.YYYYMMDDHHMMSSMMMM to gatord
+	char *newGatorPath = strdup(gatorPath);
+	char *dot = strrchr(newGatorPath, '.');
+	if (dot != NULL) {
+		*dot = '\0';
+		if (rename(gatorPath, newGatorPath) != 0) {
+			logg->logError(GATOR_ERROR "rename failed");
+			handleException();
+		}
+	}
+
+	char buf[128];
+	int pipefd[2];
+	if (pipe_cloexec(pipefd) != 0) {
+		logg->logError(GATOR_ERROR "pipe failed");
+		handleException();
+	}
+
+	// Fork and start gatord (redirect stdin, stdout and stderr so shell can close)
+	int child = fork();
+	if (child < 0) {
+		logg->logError(GATOR_ERROR "fork failed");
+		handleException();
+	} else if (child == 0) {
+		int inFd;
+		int outFd;
+		int errFd;
+		int result = -1;
+
+		buf[0] = '\0';
+		close(pipefd[0]);
+
+		inFd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+		if (inFd < 0) {
+			snprintf(buf, sizeof(buf), GATOR_ERROR "open of /dev/null failed");
+			goto fail_exit;
+		}
+		outFd = open("gatord.out", O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644);
+		if (outFd < 0) {
+			snprintf(buf, sizeof(buf), GATOR_ERROR "open of gatord.out failed");
+			goto fail_exit;
+		}
+		errFd = open("gatord.err", O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644);
+		if (errFd < 0) {
+			snprintf(buf, sizeof(buf), GATOR_ERROR "open of gatord.err failed");
+			goto fail_exit;
+		}
+		if (dup2(inFd, STDIN_FILENO) < 0) {
+			snprintf(buf, sizeof(buf), GATOR_ERROR "dup2 for stdin failed");
+			goto fail_exit;
+		}
+		fflush(stdout);
+		if (dup2(outFd, STDOUT_FILENO) < 0) {
+			snprintf(buf, sizeof(buf), GATOR_ERROR "dup2 for stdout failed");
+			goto fail_exit;
+		}
+		fflush(stderr);
+		if (dup2(errFd, STDERR_FILENO) < 0) {
+			snprintf(buf, sizeof(buf), GATOR_ERROR "dup2 for stderr failed");
+			goto fail_exit;
+		}
+
+		snprintf(buf, sizeof(buf), GATOR_MSG "done");
+		result = 0;
+
+	fail_exit:
+		if (buf[0] != '\0') {
+			const ssize_t bytes = write(pipefd[1], buf, sizeof(buf));
+			// Can't do anything if this fails
+			(void)bytes;
+		}
+		close(pipefd[1]);
+
+		if (result == 0) {
+			// Continue to execute gator normally
+			return;
+		}
+		exit(-1);
+	}
+
+	close(pipefd[1]);
+	const ssize_t bytes = read(pipefd[0], buf, sizeof(buf));
+	if (bytes > 0) {
+		logg->logError("%s", buf);
+		handleException();
+	}
+	close(pipefd[0]);
+
+	// Exit so parent shell can move on
+	exit(0);
+}