1 files changed, 232 insertions, 0 deletions
diff --git a/daemon/Setup.cpp b/daemon/Setup.cpp
new file mode 100644
index 0000000..d4ce032
--- /dev/null
+++ b/daemon/Setup.cpp
@@ -0,0 +1,232 @@
+/**
+ * Copyright (C) ARM Limited 2014. 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/stat.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"
+
+bool getLinuxVersion(int version[3]) {
+	// Check the kernel version
+	struct utsname utsname;
+	if (uname(&utsname) != 0) {
+		logg->logMessage("%s(%s:%i): uname failed", __FUNCTION__, __FILE__, __LINE__);
+		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(__FILE__, __LINE__, "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(__FILE__, __LINE__, "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(__FILE__, __LINE__, "gator: error: parsing stat begin failed");
+			handleException();
+		}
+		++comm;
+		char *const str = strrchr(comm, ')');
+		if (str == NULL) {
+			logg->logError(__FILE__, __LINE__, "gator: error: parsing stat end failed");
+			handleException();
+		}
+		*str = '\0';
+
+		if (strncmp(comm, "gator", 5) == 0) {
+			// Assume there is only one gator process
+			return pid;
+		}
+	}
+
+	closedir(proc);
+
+	return -1;
+}
+
+int update(const char *const gatorPath) {
+	printf("gator: starting\n");
+
+	int version[3];
+	if (!getLinuxVersion(version)) {
+		logg->logError(__FILE__, __LINE__, "gator: error: getLinuxVersion failed");
+		handleException();
+	}
+
+	if (KERNEL_VERSION(version[0], version[1], version[2]) < KERNEL_VERSION(2, 6, 32)) {
+		logg->logError(__FILE__, __LINE__, "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(__FILE__, __LINE__, "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 (access("/sys/module/gator", F_OK) == 0) {
+		logg->logError(__FILE__, __LINE__, "gator: error: Streamline has detected that the gator kernel module is loaded on your device. Please build an updated version of gator.ko and gatord and install them on your device.");
+		handleException();
+	}
+
+	if (geteuid() != 0) {
+		printf("gator: trying sudo\n");
+		execlp("sudo", "sudo", gatorPath, "-u", NULL);
+		// Streamline will provide the password if needed
+
+		printf("gator: trying su\n");
+		char buf[1<<10];
+		snprintf(buf, sizeof(buf), "%s -u", gatorPath);
+		execlp("su", "su", "-", "-c", buf, NULL);
+		// Streamline will provide the password if needed
+
+		logg->logError(__FILE__, __LINE__, "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: now root\n");
+
+	// setenforce 0 not needed for userspace gator
+
+	// Kill existing gator
+	DynBuf gatorStatPath;
+	int gator_main = pgrep_gator(&gatorStatPath);
+	if (gator_main > 0) {
+		if (kill(gator_main, SIGTERM) != 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: kill SIGTERM failed");
+			handleException();
+		}
+		for (int i = 0; ; ++i) {
+			if (access(gatorStatPath.getBuf(), F_OK) != 0) {
+				break;
+			}
+			if (i == 5) {
+				if (kill(gator_main, SIGKILL) != 0) {
+					logg->logError(__FILE__, __LINE__, "gator: error: kill SIGKILL failed");
+					handleException();
+				}
+			} else if (i >= 10) {
+				logg->logError(__FILE__, __LINE__, "gator: error: unable to kill running gator");
+				handleException();
+			}
+			sleep(1);
+		}
+	}
+	printf("gator: no gatord running\n");
+
+	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(__FILE__, __LINE__, "gator: error: rename failed");
+			handleException();
+		}
+	}
+
+	// Fork and start gatord (redirect stdout and stderr)
+	int child = fork();
+	if (child < 0) {
+		logg->logError(__FILE__, __LINE__, "gator: error: fork failed");
+		handleException();
+	} else if (child == 0) {
+		int inFd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+		if (inFd < 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: open of /dev/null failed");
+			handleException();
+		}
+		int outFd = open("gatord.out", O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0600);
+		if (outFd < 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: open of gatord.out failed");
+			handleException();
+		}
+		int errFd = open("gatord.err", O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0600);
+		if (errFd < 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: open of gatord.err failed");
+			handleException();
+		}
+		if (dup2(inFd, STDIN_FILENO) < 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: dup2 for stdin failed");
+			handleException();
+		}
+		if (dup2(outFd, STDOUT_FILENO) < 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: dup2 for stdout failed");
+			handleException();
+		}
+		if (dup2(errFd, STDERR_FILENO) < 0) {
+			logg->logError(__FILE__, __LINE__, "gator: error: dup2 for stderr failed");
+			handleException();
+		}
+		execlp(newGatorPath, newGatorPath, "-a", NULL);
+		logg->logError(__FILE__, __LINE__, "gator: error: execlp failed");
+		handleException();
+	}
+
+	printf("gator: done\n");
+
+	return 0;
+}