diff options
Diffstat (limited to 'conmon/conmon.c')
| -rw-r--r-- | conmon/conmon.c | 1465 |
1 files changed, 0 insertions, 1465 deletions
diff --git a/conmon/conmon.c b/conmon/conmon.c deleted file mode 100644 index b00cb0cd5..000000000 --- a/conmon/conmon.c +++ /dev/null @@ -1,1465 +0,0 @@ -#define _GNU_SOURCE -#include <ctype.h> -#include <errno.h> -#include <fcntl.h> -#include <limits.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <stdint.h> -#include <sys/prctl.h> -#include <sys/socket.h> -#include <sys/types.h> -#include <sys/un.h> -#include <sys/stat.h> -#include <sys/wait.h> -#include <sys/eventfd.h> -#include <sys/stat.h> -#include <sys/uio.h> -#include <sys/ioctl.h> -#include <termios.h> -#include <syslog.h> -#include <unistd.h> -#include <inttypes.h> - -#include <glib.h> -#include <glib-unix.h> - -#include "cmsg.h" - -#define pexit(fmt, ...) \ - do { \ - fprintf(stderr, "[conmon:e]: " fmt " %m\n", ##__VA_ARGS__); \ - syslog(LOG_ERR, "conmon <error>: " fmt ": %m\n", ##__VA_ARGS__); \ - exit(EXIT_FAILURE); \ - } while (0) - -#define nexit(fmt, ...) \ - do { \ - fprintf(stderr, "[conmon:e]: " fmt "\n", ##__VA_ARGS__); \ - syslog(LOG_ERR, "conmon <error>: " fmt " \n", ##__VA_ARGS__); \ - exit(EXIT_FAILURE); \ - } while (0) - -#define nwarn(fmt, ...) \ - do { \ - fprintf(stderr, "[conmon:w]: " fmt "\n", ##__VA_ARGS__); \ - syslog(LOG_INFO, "conmon <nwarn>: " fmt " \n", ##__VA_ARGS__); \ - } while (0) - -#define ninfo(fmt, ...) \ - do { \ - fprintf(stderr, "[conmon:i]: " fmt "\n", ##__VA_ARGS__); \ - syslog(LOG_INFO, "conmon <ninfo>: " fmt " \n", ##__VA_ARGS__); \ - } while (0) - -#define _cleanup_(x) __attribute__((cleanup(x))) - -static inline void freep(void *p) -{ - free(*(void **)p); -} - -static inline void closep(int *fd) -{ - if (*fd >= 0) - close(*fd); - *fd = -1; -} - -static inline void fclosep(FILE **fp) { - if (*fp) - fclose(*fp); - *fp = NULL; -} - -static inline void gstring_free_cleanup(GString **string) -{ - if (*string) - g_string_free(*string, TRUE); -} - -static inline void strv_cleanup(char ***strv) -{ - if (strv) - g_strfreev (*strv); -} - -#define _cleanup_free_ _cleanup_(freep) -#define _cleanup_close_ _cleanup_(closep) -#define _cleanup_fclose_ _cleanup_(fclosep) -#define _cleanup_gstring_ _cleanup_(gstring_free_cleanup) -#define _cleanup_strv_ _cleanup_(strv_cleanup) - -#define BUF_SIZE 8192 -#define CMD_SIZE 1024 -#define MAX_EVENTS 10 - -#define DEFAULT_SOCKET_PATH "/var/lib/crio" - -static bool opt_terminal = false; -static bool opt_stdin = false; -static char *opt_cid = NULL; -static char *opt_cuuid = NULL; -static char *opt_runtime_path = NULL; -static char *opt_bundle_path = NULL; -static char *opt_pid_file = NULL; -static bool opt_systemd_cgroup = false; -static bool opt_no_pivot = false; -static char *opt_exec_process_spec = NULL; -static bool opt_exec = false; -static char *opt_log_path = NULL; -static char *opt_exit_dir = NULL; -static int opt_timeout = 0; -static int64_t opt_log_size_max = -1; -static char *opt_socket_path = DEFAULT_SOCKET_PATH; -static GOptionEntry opt_entries[] = -{ - { "terminal", 't', 0, G_OPTION_ARG_NONE, &opt_terminal, "Terminal", NULL }, - { "stdin", 'i', 0, G_OPTION_ARG_NONE, &opt_stdin, "Stdin", NULL }, - { "cid", 'c', 0, G_OPTION_ARG_STRING, &opt_cid, "Container ID", NULL }, - { "cuuid", 'u', 0, G_OPTION_ARG_STRING, &opt_cuuid, "Container UUID", NULL }, - { "runtime", 'r', 0, G_OPTION_ARG_STRING, &opt_runtime_path, "Runtime path", NULL }, - { "no-pivot", 0, 0, G_OPTION_ARG_NONE, &opt_no_pivot, "do not use pivot_root", NULL }, - { "bundle", 'b', 0, G_OPTION_ARG_STRING, &opt_bundle_path, "Bundle path", NULL }, - { "pidfile", 'p', 0, G_OPTION_ARG_STRING, &opt_pid_file, "PID file", NULL }, - { "systemd-cgroup", 's', 0, G_OPTION_ARG_NONE, &opt_systemd_cgroup, "Enable systemd cgroup manager", NULL }, - { "exec", 'e', 0, G_OPTION_ARG_NONE, &opt_exec, "Exec a command in a running container", NULL }, - { "exec-process-spec", 0, 0, G_OPTION_ARG_STRING, &opt_exec_process_spec, "Path to the process spec for exec", NULL }, - { "exit-dir", 0, 0, G_OPTION_ARG_STRING, &opt_exit_dir, "Path to the directory where exit files are written", NULL }, - { "log-path", 'l', 0, G_OPTION_ARG_STRING, &opt_log_path, "Log file path", NULL }, - { "timeout", 'T', 0, G_OPTION_ARG_INT, &opt_timeout, "Timeout in seconds", NULL }, - { "log-size-max", 0, 0, G_OPTION_ARG_INT64, &opt_log_size_max, "Maximum size of log file", NULL }, - { "socket-dir-path", 0, 0, G_OPTION_ARG_STRING, &opt_socket_path, "Location of container attach sockets", NULL }, - { NULL } -}; - -/* strlen("1997-03-25T13:20:42.999999999+01:00 stdout ") + 1 */ -#define TSBUFLEN 44 - -#define CGROUP_ROOT "/sys/fs/cgroup" - -static int log_fd = -1; - -static ssize_t write_all(int fd, const void *buf, size_t count) -{ - size_t remaining = count; - const char *p = buf; - ssize_t res; - - while (remaining > 0) { - do { - res = write(fd, p, remaining); - } while (res == -1 && errno == EINTR); - - if (res <= 0) - return -1; - - remaining -= res; - p += res; - } - - return count; -} - -#define WRITEV_BUFFER_N_IOV 128 - -typedef struct { - int iovcnt; - struct iovec iov[WRITEV_BUFFER_N_IOV]; -} writev_buffer_t; - -static ssize_t writev_buffer_flush (int fd, writev_buffer_t *buf) -{ - size_t count = 0; - ssize_t res; - struct iovec *iov; - int iovcnt; - - iovcnt = buf->iovcnt; - iov = buf->iov; - - while (iovcnt > 0) { - do { - res = writev(fd, iov, iovcnt); - } while (res == -1 && errno == EINTR); - - if (res <= 0) - return -1; - - count += res; - - while (res > 0) { - size_t from_this = MIN((size_t)res, iov->iov_len); - iov->iov_len -= from_this; - res -= from_this; - - if (iov->iov_len == 0) { - iov++; - iovcnt--; - } - } - } - - buf->iovcnt = 0; - - return count; -} - -ssize_t writev_buffer_append_segment(int fd, writev_buffer_t *buf, const void *data, ssize_t len) -{ - if (data == NULL) - return 1; - - if (len < 0) - len = strlen ((char *)data); - - if (buf->iovcnt == WRITEV_BUFFER_N_IOV && - writev_buffer_flush (fd, buf) < 0) - return -1; - - if (len > 0) { - buf->iov[buf->iovcnt].iov_base = (void *)data; - buf->iov[buf->iovcnt].iov_len = (size_t)len; - buf->iovcnt++; - } - - return 1; -} - -int set_k8s_timestamp(char *buf, ssize_t buflen, const char *pipename) -{ - struct tm *tm; - struct timespec ts; - char off_sign = '+'; - int off, len, err = -1; - - if (clock_gettime(CLOCK_REALTIME, &ts) < 0) { - /* If CLOCK_REALTIME is not supported, we set nano seconds to 0 */ - if (errno == EINVAL) { - ts.tv_nsec = 0; - } else { - return err; - } - } - - if ((tm = localtime(&ts.tv_sec)) == NULL) - return err; - - - off = (int) tm->tm_gmtoff; - if (tm->tm_gmtoff < 0) { - off_sign = '-'; - off = -off; - } - - len = snprintf(buf, buflen, "%d-%02d-%02dT%02d:%02d:%02d.%09ld%c%02d:%02d %s ", - tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec, ts.tv_nsec, - off_sign, off / 3600, off % 3600, pipename); - - if (len < buflen) - err = 0; - return err; -} - -/* stdpipe_t represents one of the std pipes (or NONE). - * Sync with const in container_attach.go */ -typedef enum { - NO_PIPE, - STDIN_PIPE, /* unused */ - STDOUT_PIPE, - STDERR_PIPE, -} stdpipe_t; - -const char *stdpipe_name(stdpipe_t pipe) -{ - switch (pipe) { - case STDIN_PIPE: - return "stdin"; - case STDOUT_PIPE: - return "stdout"; - case STDERR_PIPE: - return "stderr"; - default: - return "NONE"; - } -} - -/* - * The CRI requires us to write logs with a (timestamp, stream, line) format - * for every newline-separated line. write_k8s_log writes said format for every - * line in buf, and will partially write the final line of the log if buf is - * not terminated by a newline. - */ -static int write_k8s_log(int fd, stdpipe_t pipe, const char *buf, ssize_t buflen) -{ - char tsbuf[TSBUFLEN]; - writev_buffer_t bufv = {0}; - static int64_t bytes_written = 0; - int64_t bytes_to_be_written = 0; - - /* - * Use the same timestamp for every line of the log in this buffer. - * There is no practical difference in the output since write(2) is - * fast. - */ - if (set_k8s_timestamp(tsbuf, sizeof tsbuf, stdpipe_name(pipe))) - /* TODO: We should handle failures much more cleanly than this. */ - return -1; - - while (buflen > 0) { - const char *line_end = NULL; - ptrdiff_t line_len = 0; - bool partial = FALSE; - - /* Find the end of the line, or alternatively the end of the buffer. */ - line_end = memchr(buf, '\n', buflen); - if (line_end == NULL) { - line_end = &buf[buflen-1]; - partial = TRUE; - } - line_len = line_end - buf + 1; - - /* This is line_len bytes + TSBUFLEN - 1 + 2 (- 1 is for ignoring \0). */ - bytes_to_be_written = line_len + TSBUFLEN + 1; - - /* If partial, then we add a \n */ - if (partial) { - bytes_to_be_written += 1; - } - - /* - * We re-open the log file if writing out the bytes will exceed the max - * log size. We also reset the state so that the new file is started with - * a timestamp. - */ - if ((opt_log_size_max > 0) && (bytes_written + bytes_to_be_written) > opt_log_size_max) { - ninfo("Creating new log file"); - bytes_written = 0; - - /* Close the existing fd */ - close(fd); - - /* Unlink the file */ - if (unlink(opt_log_path) < 0) { - pexit("Failed to unlink log file"); - } - - /* Open the log path file again */ - log_fd = open(opt_log_path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0600); - if (log_fd < 0) - pexit("Failed to open log file"); - fd = log_fd; - } - - /* Output the timestamp */ - if (writev_buffer_append_segment(fd, &bufv, tsbuf, -1) < 0) { - nwarn("failed to write (timestamp, stream) to log"); - goto next; - } - - /* Output log tag for partial or newline */ - if (partial) { - if (writev_buffer_append_segment(fd, &bufv, "P ", -1) < 0) { - nwarn("failed to write partial log tag"); - goto next; - } - } else { - if (writev_buffer_append_segment(fd, &bufv, "F ", -1) < 0) { - nwarn("failed to write end log tag"); - goto next; - } - } - - /* Output the actual contents. */ - if (writev_buffer_append_segment(fd, &bufv, buf, line_len) < 0) { - nwarn("failed to write buffer to log"); - goto next; - } - - /* Output a newline for partial */ - if (partial) { - if (writev_buffer_append_segment(fd, &bufv, "\n", -1) < 0) { - nwarn("failed to write newline to log"); - goto next; - } - } - - bytes_written += bytes_to_be_written; -next: - /* Update the head of the buffer remaining to output. */ - buf += line_len; - buflen -= line_len; - } - - if (writev_buffer_flush (fd, &bufv) < 0) { - nwarn("failed to flush buffer to log"); - } - - ninfo("Total bytes written: %"PRId64"", bytes_written); - - return 0; -} - -/* - * Returns the path for specified controller name for a pid. - * Returns NULL on error. - */ -static char *process_cgroup_subsystem_path(int pid, const char *subsystem) { - _cleanup_free_ char *cgroups_file_path = g_strdup_printf("/proc/%d/cgroup", pid); - _cleanup_fclose_ FILE *fp = NULL; - fp = fopen(cgroups_file_path, "re"); - if (fp == NULL) { - nwarn("Failed to open cgroups file: %s", cgroups_file_path); - return NULL; - } - - _cleanup_free_ char *line = NULL; - ssize_t read; - size_t len = 0; - char *ptr, *path; - char *subsystem_path = NULL; - int i; - while ((read = getline(&line, &len, fp)) != -1) { - _cleanup_strv_ char **subsystems = NULL; - ptr = strchr(line, ':'); - if (ptr == NULL) { - nwarn("Error parsing cgroup, ':' not found: %s", line); - return NULL; - } - ptr++; - path = strchr(ptr, ':'); - if (path == NULL) { - nwarn("Error parsing cgroup, second ':' not found: %s", line); - return NULL; - } - *path = 0; - path++; - subsystems = g_strsplit (ptr, ",", -1); - for (i = 0; subsystems[i] != NULL; i++) { - if (strcmp (subsystems[i], subsystem) == 0) { - char *subpath = strchr(subsystems[i], '='); - if (subpath == NULL) { - subpath = ptr; - } else { - *subpath = 0; - } - - subsystem_path = g_strdup_printf("%s/%s%s", CGROUP_ROOT, subpath, path); - subsystem_path[strlen(subsystem_path) - 1] = '\0'; - return subsystem_path; - } - } - } - - return NULL; -} - -static char *escape_json_string(const char *str) -{ - GString *escaped; - const char *p; - - p = str; - escaped = g_string_sized_new(strlen(str)); - - while (*p != 0) { - char c = *p++; - if (c == '\\' || c == '"') { - g_string_append_c(escaped, '\\'); - g_string_append_c(escaped, c); - } else if (c == '\n') { - g_string_append_printf (escaped, "\\n"); - } else if (c == '\t') { - g_string_append_printf (escaped, "\\t"); - } else if ((c > 0 && c < 0x1f) || c == 0x7f) { - g_string_append_printf (escaped, "\\u00%02x", (guint)c); - } else { - g_string_append_c (escaped, c); - } - } - - return g_string_free (escaped, FALSE); -} - -static int get_pipe_fd_from_env(const char *envname) -{ - char *pipe_str, *endptr; - int pipe_fd; - - pipe_str = getenv(envname); - if (pipe_str == NULL) - return -1; - - errno = 0; - pipe_fd = strtol(pipe_str, &endptr, 10); - if (errno != 0 || *endptr != '\0') - pexit("unable to parse %s", envname); - if (fcntl(pipe_fd, F_SETFD, FD_CLOEXEC) == -1) - pexit("unable to make %s CLOEXEC", envname); - - return pipe_fd; -} - -static void add_argv(GPtrArray *argv_array, ...) G_GNUC_NULL_TERMINATED; - -static void add_argv(GPtrArray *argv_array, ...) -{ - va_list args; - char *arg; - - va_start (args, argv_array); - while ((arg = va_arg (args, char *))) - g_ptr_array_add (argv_array, arg); - va_end (args); -} - -static void end_argv(GPtrArray *argv_array) -{ - g_ptr_array_add(argv_array, NULL); -} - -/* Global state */ - -static int runtime_status = -1; -static int container_status = -1; - -static int masterfd_stdin = -1; -static int masterfd_stdout = -1; -static int masterfd_stderr = -1; - -/* Used for attach */ -static int conn_sock = -1; -static int conn_sock_readable; -static int conn_sock_writable; - -static int oom_event_fd = -1; -static int attach_socket_fd = -1; -static int console_socket_fd = -1; -static int terminal_ctrl_fd = -1; - -static bool timed_out = FALSE; - -static GMainLoop *main_loop = NULL; - -static void conn_sock_shutdown(int how) -{ - if (conn_sock == -1) - return; - shutdown(conn_sock, how); - if (how & SHUT_RD) - conn_sock_readable = false; - if (how & SHUT_WR) - conn_sock_writable = false; - if (!conn_sock_writable && !conn_sock_readable) { - close(conn_sock); - conn_sock = -1; - } -} - -static gboolean stdio_cb(int fd, GIOCondition condition, gpointer user_data); - -static gboolean tty_hup_timeout_scheduled = false; - -static gboolean tty_hup_timeout_cb (G_GNUC_UNUSED gpointer user_data) -{ - tty_hup_timeout_scheduled = false; - g_unix_fd_add (masterfd_stdout, G_IO_IN, stdio_cb, GINT_TO_POINTER(STDOUT_PIPE)); - return G_SOURCE_REMOVE; -} - -static bool read_stdio(int fd, stdpipe_t pipe, bool *eof) -{ - #define STDIO_BUF_SIZE 8192 /* Sync with redirectResponseToOutputStreams() */ - /* We use one extra byte at the start, which we don't read into, instead - we use that for marking the pipe when we write to the attached socket */ - char real_buf[STDIO_BUF_SIZE + 1]; - char *buf = real_buf + 1; - ssize_t num_read = 0; - - if (eof) - *eof = false; - - num_read = read(fd, buf, STDIO_BUF_SIZE); - if (num_read == 0) { - if (eof) - *eof = true; - return false; - } else if (num_read < 0) { - nwarn("stdio_input read failed %s", strerror(errno)); - return false; - } else { - if (write_k8s_log(log_fd, pipe, buf, num_read) < 0) { - nwarn("write_k8s_log failed"); - return G_SOURCE_CONTINUE; - } - - real_buf[0] = pipe; - if (conn_sock_writable && write_all(conn_sock, real_buf, num_read+1) < 0) { - nwarn("Failed to write to socket"); - conn_sock_shutdown(SHUT_WR); - } - return true; - } -} - -static void on_sigchld(G_GNUC_UNUSED int signal) -{ - raise (SIGUSR1); -} - -static void check_child_processes(GHashTable *pid_to_handler) -{ - void (*cb) (GPid, int, gpointer); - - for (;;) { - int status; - pid_t pid = waitpid(-1, &status, WNOHANG); - - if (pid < 0 && errno == EINTR) - continue; - if (pid < 0 && errno == ECHILD) { - g_main_loop_quit (main_loop); - return; - } - if (pid < 0) - pexit("Failed to read child process status"); - - if (pid == 0) - return; - - /* If we got here, pid > 0, so we have a valid pid to check. */ - cb = g_hash_table_lookup(pid_to_handler, &pid); - if (cb) - cb(pid, status, 0); - } -} - -static gboolean on_sigusr1_cb(gpointer user_data) -{ - GHashTable *pid_to_handler = (GHashTable *) user_data; - check_child_processes (pid_to_handler); - return G_SOURCE_CONTINUE; -} - -static gboolean stdio_cb(int fd, GIOCondition condition, gpointer user_data) -{ - stdpipe_t pipe = GPOINTER_TO_INT(user_data); - bool read_eof = false; - bool has_input = (condition & G_IO_IN) != 0; - bool has_hup = (condition & G_IO_HUP) != 0; - - /* When we get here, condition can be G_IO_IN and/or G_IO_HUP. - IN means there is some data to read. - HUP means the other side closed the fd. In the case of a pine - this in final, and we will never get more data. However, in the - terminal case this just means that nobody has the terminal - open at this point, and this can be change whenever someone - opens the tty */ - - /* Read any data before handling hup */ - if (has_input) { - read_stdio(fd, pipe, &read_eof); - } - - if (has_hup && opt_terminal && pipe == STDOUT_PIPE) { - /* We got a HUP from the terminal master this means there - are no open slaves ptys atm, and we will get a lot - of wakeups until we have one, switch to polling - mode. */ - - /* If we read some data this cycle, wait one more, maybe there - is more in the buffer before we handle the hup */ - if (has_input && !read_eof) { - return G_SOURCE_CONTINUE; - } - - if (!tty_hup_timeout_scheduled) { - g_timeout_add (100, tty_hup_timeout_cb, NULL); - } - tty_hup_timeout_scheduled = true; - return G_SOURCE_REMOVE; - } - - if (read_eof || (has_hup && !has_input)) { - /* End of input */ - if (pipe == STDOUT_PIPE) - masterfd_stdout = -1; - if (pipe == STDERR_PIPE) - masterfd_stderr = -1; - - close (fd); - return G_SOURCE_REMOVE; - } - - return G_SOURCE_CONTINUE; -} - -static gboolean timeout_cb (G_GNUC_UNUSED gpointer user_data) -{ - timed_out = TRUE; - ninfo ("Timed out, killing main loop"); - g_main_loop_quit (main_loop); - return G_SOURCE_REMOVE; -} - -static gboolean oom_cb(int fd, GIOCondition condition, G_GNUC_UNUSED gpointer user_data) -{ - uint64_t oom_event; - ssize_t num_read = 0; - - if ((condition & G_IO_IN) != 0) { - num_read = read(fd, &oom_event, sizeof(uint64_t)); - if (num_read < 0) { - nwarn("Failed to read oom event from eventfd"); - return G_SOURCE_CONTINUE; - } - - if (num_read > 0) { - if (num_read != sizeof(uint64_t)) - nwarn("Failed to read full oom event from eventfd"); - ninfo("OOM received"); - if (open("oom", O_CREAT, 0666) < 0) { - nwarn("Failed to write oom file"); - } - return G_SOURCE_CONTINUE; - } - } - - /* End of input */ - close (fd); - oom_event_fd = -1; - return G_SOURCE_REMOVE; -} - -static gboolean conn_sock_cb(int fd, GIOCondition condition, G_GNUC_UNUSED gpointer user_data) -{ - #define CONN_SOCK_BUF_SIZE 32*1024 /* Match the write size in CopyDetachable */ - char buf[CONN_SOCK_BUF_SIZE]; - ssize_t num_read = 0; - - if ((condition & G_IO_IN) != 0) { - num_read = read(fd, buf, CONN_SOCK_BUF_SIZE); - if (num_read < 0) - return G_SOURCE_CONTINUE; - - if (num_read > 0 && masterfd_stdin >= 0) { - if (write_all(masterfd_stdin, buf, num_read) < 0) { - nwarn("Failed to write to container stdin"); - } - return G_SOURCE_CONTINUE; - } - } - - /* End of input */ - conn_sock_shutdown(SHUT_RD); - if (masterfd_stdin >= 0 && opt_stdin) { - close(masterfd_stdin); - masterfd_stdin = -1; - } - return G_SOURCE_REMOVE; -} - -static gboolean attach_cb(int fd, G_GNUC_UNUSED GIOCondition condition, G_GNUC_UNUSED gpointer user_data) -{ - conn_sock = accept(fd, NULL, NULL); - if (conn_sock == -1) { - if (errno != EWOULDBLOCK) - nwarn("Failed to accept client connection on attach socket"); - } else { - conn_sock_readable = true; - conn_sock_writable = true; - g_unix_fd_add (conn_sock, G_IO_IN|G_IO_HUP|G_IO_ERR, conn_sock_cb, GINT_TO_POINTER(STDOUT_PIPE)); - ninfo("Accepted connection %d", conn_sock); - } - - return G_SOURCE_CONTINUE; -} - -static gboolean ctrl_cb(int fd, G_GNUC_UNUSED GIOCondition condition, G_GNUC_UNUSED gpointer user_data) -{ - #define CTLBUFSZ 200 - static char ctlbuf[CTLBUFSZ]; - static int readsz = CTLBUFSZ - 1; - static char *readptr = ctlbuf; - ssize_t num_read = 0; - int ctl_msg_type = -1; - int height = -1; - int width = -1; - struct winsize ws; - int ret; - - num_read = read(fd, readptr, readsz); - if (num_read <= 0) { - nwarn("Failed to read from control fd"); - return G_SOURCE_CONTINUE; - } - - readptr[num_read] = '\0'; - ninfo("Got ctl message: %s\n", ctlbuf); - - char *beg = ctlbuf; - char *newline = strchrnul(beg, '\n'); - /* Process each message which ends with a line */ - while (*newline != '\0') { - ret = sscanf(ctlbuf, "%d %d %d\n", &ctl_msg_type, &height, &width); - if (ret != 3) { - nwarn("Failed to sscanf message"); - return G_SOURCE_CONTINUE; - } - ninfo("Message type: %d, Height: %d, Width: %d", ctl_msg_type, height, width); - ret = ioctl(masterfd_stdout, TIOCGWINSZ, &ws); - ninfo("Existing size: %d %d", ws.ws_row, ws.ws_col); - ws.ws_row = height; - ws.ws_col = width; - ret = ioctl(masterfd_stdout, TIOCSWINSZ, &ws); - if (ret == -1) { - nwarn("Failed to set process pty terminal size"); - } - beg = newline + 1; - newline = strchrnul(beg, '\n'); - } - if (num_read == (CTLBUFSZ - 1) && beg == ctlbuf) { - /* - * We did not find a newline in the entire buffer. - * This shouldn't happen as our buffer is larger than - * the message that we expect to receive. - */ - nwarn("Could not find newline in entire buffer\n"); - } else if (*beg == '\0') { - /* We exhausted all messages that were complete */ - readptr = ctlbuf; - readsz = CTLBUFSZ - 1; - } else { - /* - * We copy remaining data to beginning of buffer - * and advance readptr after that. - */ - int cp_rem = 0; - do { - ctlbuf[cp_rem++] = *beg++; - } while (*beg != '\0'); - readptr = ctlbuf + cp_rem; - readsz = CTLBUFSZ - 1 - cp_rem; - } - - return G_SOURCE_CONTINUE; -} - -static gboolean terminal_accept_cb(int fd, G_GNUC_UNUSED GIOCondition condition, G_GNUC_UNUSED gpointer user_data) -{ - const char *csname = user_data; - struct file_t console; - int connfd = -1; - struct termios tset; - - ninfo("about to accept from console_socket_fd: %d", fd); - connfd = accept4(fd, NULL, NULL, SOCK_CLOEXEC); - if (connfd < 0) { - nwarn("Failed to accept console-socket connection"); - return G_SOURCE_CONTINUE; - } - - /* Not accepting anything else. */ - close(fd); - unlink(csname); - - /* We exit if this fails. */ - ninfo("about to recvfd from connfd: %d", connfd); - console = recvfd(connfd); - - ninfo("console = {.name = '%s'; .fd = %d}", console.name, console.fd); - free(console.name); - - /* We change the terminal settings to match kube settings */ - if (tcgetattr(console.fd, &tset) == -1) - pexit("Failed to get console terminal settings"); - - tset.c_oflag |= ONLCR; - - if (tcsetattr(console.fd, TCSANOW, &tset) == -1) - pexit("Failed to set console terminal settings"); - - /* We only have a single fd for both pipes, so we just treat it as - * stdout. stderr is ignored. */ - masterfd_stdin = console.fd; - masterfd_stdout = console.fd; - - /* Clean up everything */ - close(connfd); - - return G_SOURCE_CONTINUE; -} - -static void -runtime_exit_cb (G_GNUC_UNUSED GPid pid, int status, G_GNUC_UNUSED gpointer user_data) -{ - runtime_status = status; - g_main_loop_quit (main_loop); -} - -static void -container_exit_cb (G_GNUC_UNUSED GPid pid, int status, G_GNUC_UNUSED gpointer user_data) -{ - ninfo("container %d exited with status %d\n", pid, status); - container_status = status; - g_main_loop_quit (main_loop); -} - -static void write_sync_fd(int sync_pipe_fd, int res, const char *message) -{ - _cleanup_free_ char *escaped_message = NULL; - _cleanup_free_ char *json = NULL; - const char *res_key; - ssize_t len; - - if (sync_pipe_fd == -1) - return; - - if (opt_exec) - res_key = "exit_code"; - else - res_key = "pid"; - - if (message) { - escaped_message = escape_json_string(message); - json = g_strdup_printf ("{\"%s\": %d, \"message\": \"%s\"}\n", res_key, res, escaped_message); - } else { - json = g_strdup_printf ("{\"%s\": %d}\n", res_key, res); - } - - len = strlen(json); - if (write_all(sync_pipe_fd, json, len) != len) { - pexit("Unable to send container stderr message to parent"); - } -} - -static char *setup_console_socket(void) -{ - struct sockaddr_un addr = {0}; - _cleanup_free_ const char *tmpdir = g_get_tmp_dir(); - _cleanup_free_ char *csname = g_build_filename(tmpdir, "conmon-term.XXXXXX", NULL); - /* - * Generate a temporary name. Is this unsafe? Probably, but we can - * replace it with a rename(2) setup if necessary. - */ - - int unusedfd = g_mkstemp(csname); - if (unusedfd < 0) - pexit("Failed to generate random path for console-socket"); - close(unusedfd); - - addr.sun_family = AF_UNIX; - strncpy(addr.sun_path, csname, sizeof(addr.sun_path)-1); - - ninfo("addr{sun_family=AF_UNIX, sun_path=%s}", addr.sun_path); - - /* Bind to the console socket path. */ - console_socket_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); - if (console_socket_fd < 0) - pexit("Failed to create console-socket"); - if (fchmod(console_socket_fd, 0700)) - pexit("Failed to change console-socket permissions"); - /* XXX: This should be handled with a rename(2). */ - if (unlink(csname) < 0) - pexit("Failed to unlink temporary random path"); - if (bind(console_socket_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) - pexit("Failed to bind to console-socket"); - if (listen(console_socket_fd, 128) < 0) - pexit("Failed to listen on console-socket"); - - return g_strdup(csname); -} - -static char *setup_attach_socket(void) -{ - _cleanup_free_ char *attach_sock_path = NULL; - char *attach_symlink_dir_path; - struct sockaddr_un attach_addr = {0}; - attach_addr.sun_family = AF_UNIX; - - /* - * Create a symlink so we don't exceed unix domain socket - * path length limit. - */ - attach_symlink_dir_path = g_build_filename(opt_socket_path, opt_cuuid, NULL); - if (unlink(attach_symlink_dir_path) == -1 && errno != ENOENT) - pexit("Failed to remove existing symlink for attach socket directory"); - - if (symlink(opt_bundle_path, attach_symlink_dir_path) == -1) - pexit("Failed to create symlink for attach socket"); - - attach_sock_path = g_build_filename(opt_socket_path, opt_cuuid, "attach", NULL); - ninfo("attach sock path: %s", attach_sock_path); - - strncpy(attach_addr.sun_path, attach_sock_path, sizeof(attach_addr.sun_path) - 1); - ninfo("addr{sun_family=AF_UNIX, sun_path=%s}", attach_addr.sun_path); - - /* - * We make the socket non-blocking to avoid a race where client aborts connection - * before the server gets a chance to call accept. In that scenario, the server - * accept blocks till a new client connection comes in. - */ - attach_socket_fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); - if (attach_socket_fd == -1) - pexit("Failed to create attach socket"); - - if (fchmod(attach_socket_fd, 0700)) - pexit("Failed to change attach socket permissions"); - - if (bind(attach_socket_fd, (struct sockaddr *)&attach_addr, sizeof(struct sockaddr_un)) == -1) - pexit("Failed to bind attach socket: %s", attach_sock_path); - - if (listen(attach_socket_fd, 10) == -1) - pexit("Failed to listen on attach socket: %s", attach_sock_path); - - g_unix_fd_add (attach_socket_fd, G_IO_IN, attach_cb, NULL); - - return attach_symlink_dir_path; -} - -static void setup_terminal_control_fifo() -{ - _cleanup_free_ char *ctl_fifo_path = g_build_filename(opt_bundle_path, "ctl", NULL); - ninfo("ctl fifo path: %s", ctl_fifo_path); - - /* Setup fifo for reading in terminal resize and other stdio control messages */ - - if (mkfifo(ctl_fifo_path, 0666) == -1) - pexit("Failed to mkfifo at %s", ctl_fifo_path); - - terminal_ctrl_fd = open(ctl_fifo_path, O_RDONLY|O_NONBLOCK|O_CLOEXEC); - if (terminal_ctrl_fd == -1) - pexit("Failed to open control fifo"); - - /* - * Open a dummy writer to prevent getting flood of POLLHUPs when - * last writer closes. - */ - int dummyfd = open(ctl_fifo_path, O_WRONLY|O_CLOEXEC); - if (dummyfd == -1) - pexit("Failed to open dummy writer for fifo"); - - g_unix_fd_add (terminal_ctrl_fd, G_IO_IN, ctrl_cb, NULL); - - ninfo("terminal_ctrl_fd: %d", terminal_ctrl_fd); -} - -static void setup_oom_handling(int container_pid) -{ - /* Setup OOM notification for container process */ - _cleanup_free_ char *memory_cgroup_path = process_cgroup_subsystem_path(container_pid, "memory"); - _cleanup_close_ int cfd = -1; - int ofd = -1; /* Not closed */ - if (!memory_cgroup_path) { - nexit("Failed to get memory cgroup path"); - } - - _cleanup_free_ char *memory_cgroup_file_path = g_build_filename(memory_cgroup_path, "cgroup.event_control", NULL); - - if ((cfd = open(memory_cgroup_file_path, O_WRONLY | O_CLOEXEC)) == -1) { - nwarn("Failed to open %s", memory_cgroup_file_path); - return; - } - - _cleanup_free_ char *memory_cgroup_file_oom_path = g_build_filename(memory_cgroup_path, "memory.oom_control", NULL); - if ((ofd = open(memory_cgroup_file_oom_path, O_RDONLY | O_CLOEXEC)) == -1) - pexit("Failed to open %s", memory_cgroup_file_oom_path); - - if ((oom_event_fd = eventfd(0, EFD_CLOEXEC)) == -1) - pexit("Failed to create eventfd"); - - _cleanup_free_ char *data = g_strdup_printf("%d %d", oom_event_fd, ofd); - if (write_all(cfd, data, strlen(data)) < 0) - pexit("Failed to write to cgroup.event_control"); - - g_unix_fd_add (oom_event_fd, G_IO_IN, oom_cb, NULL); -} - -int main(int argc, char *argv[]) -{ - int ret; - char cwd[PATH_MAX]; - _cleanup_free_ char *default_pid_file = NULL; - _cleanup_free_ char *csname = NULL; - GError *err = NULL; - _cleanup_free_ char *contents = NULL; - int container_pid = -1; - pid_t main_pid, create_pid; - /* Used for !terminal cases. */ - int slavefd_stdin = -1; - int slavefd_stdout = -1; - int slavefd_stderr = -1; - char buf[BUF_SIZE]; - int num_read; - int sync_pipe_fd = -1; - int start_pipe_fd = -1; - GError *error = NULL; - GOptionContext *context; - GPtrArray *runtime_argv = NULL; - _cleanup_close_ int dev_null_r = -1; - _cleanup_close_ int dev_null_w = -1; - int fds[2]; - - main_loop = g_main_loop_new (NULL, FALSE); - - /* Command line parameters */ - context = g_option_context_new("- conmon utility"); - g_option_context_add_main_entries(context, opt_entries, "conmon"); - if (!g_option_context_parse(context, &argc, &argv, &error)) { - g_print("option parsing failed: %s\n", error->message); - exit(1); - } - - if (opt_cid == NULL) - nexit("Container ID not provided. Use --cid"); - - if (!opt_exec && opt_cuuid == NULL) - nexit("Container UUID not provided. Use --cuuid"); - - if (opt_runtime_path == NULL) - nexit("Runtime path not provided. Use --runtime"); - - if (!opt_exec && opt_exit_dir == NULL) - nexit("Container exit directory not provided. Use --exit-dir"); - - if (opt_bundle_path == NULL && !opt_exec) { - if (getcwd(cwd, sizeof(cwd)) == NULL) { - nexit("Failed to get working directory"); - } - opt_bundle_path = cwd; - } - - dev_null_r = open("/dev/null", O_RDONLY | O_CLOEXEC); - if (dev_null_r < 0) - pexit("Failed to open /dev/null"); - - dev_null_w = open("/dev/null", O_WRONLY | O_CLOEXEC); - if (dev_null_w < 0) - pexit("Failed to open /dev/null"); - - if (opt_exec && opt_exec_process_spec == NULL) { - nexit("Exec process spec path not provided. Use --exec-process-spec"); - } - - if (opt_pid_file == NULL) { - default_pid_file = g_strdup_printf ("%s/pidfile-%s", cwd, opt_cid); - opt_pid_file = default_pid_file; - } - - if (opt_log_path == NULL) - nexit("Log file path not provided. Use --log-path"); - - start_pipe_fd = get_pipe_fd_from_env("_OCI_STARTPIPE"); - if (start_pipe_fd >= 0) { - /* Block for an initial write to the start pipe before - spawning any childred or exiting, to ensure the - parent can put us in the right cgroup. */ - read(start_pipe_fd, buf, BUF_SIZE); - close(start_pipe_fd); - } - - /* In the create-container case we double-fork in - order to disconnect from the parent, as we want to - continue in a daemon-like way */ - main_pid = fork(); - if (main_pid < 0) { - pexit("Failed to fork the create command"); - } else if (main_pid != 0) { - exit(0); - } - - /* Disconnect stdio from parent. We need to do this, because - the parent is waiting for the stdout to end when the intermediate - child dies */ - if (dup2(dev_null_r, STDIN_FILENO) < 0) - pexit("Failed to dup over stdin"); - if (dup2(dev_null_w, STDOUT_FILENO) < 0) - pexit("Failed to dup over stdout"); - if (dup2(dev_null_w, STDERR_FILENO) < 0) - pexit("Failed to dup over stderr"); - - /* Create a new session group */ - setsid(); - - /* Environment variables */ - sync_pipe_fd = get_pipe_fd_from_env("_OCI_SYNCPIPE"); - - /* Open the log path file. */ - log_fd = open(opt_log_path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0600); - if (log_fd < 0) - pexit("Failed to open log file"); - - /* - * Set self as subreaper so we can wait for container process - * and return its exit code. - */ - ret = prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0); - if (ret != 0) { - pexit("Failed to set as subreaper"); - } - - if (opt_terminal) { - csname = setup_console_socket(); - } else { - - /* - * Create a "fake" master fd so that we can use the same epoll code in - * both cases. The slavefd_*s will be closed after we dup over - * everything. - * - * We use pipes here because open(/dev/std{out,err}) will fail if we - * used anything else (and it wouldn't be a good idea to create a new - * pty pair in the host). - */ - - if (opt_stdin) { - if (pipe2(fds, O_CLOEXEC) < 0) - pexit("Failed to create !terminal stdin pipe"); - - masterfd_stdin = fds[1]; - slavefd_stdin = fds[0]; - } - - if (pipe2(fds, O_CLOEXEC) < 0) - pexit("Failed to create !terminal stdout pipe"); - - masterfd_stdout = fds[0]; - slavefd_stdout = fds[1]; - } - - /* We always create a stderr pipe, because that way we can capture - runc stderr messages before the tty is created */ - if (pipe2(fds, O_CLOEXEC) < 0) - pexit("Failed to create stderr pipe"); - - masterfd_stderr = fds[0]; - slavefd_stderr = fds[1]; - - runtime_argv = g_ptr_array_new(); - add_argv(runtime_argv, - opt_runtime_path, - NULL); - - /* Generate the cmdline. */ - if (!opt_exec && opt_systemd_cgroup) - add_argv(runtime_argv, - "--systemd-cgroup", - NULL); - - if (opt_exec) { - add_argv(runtime_argv, - "exec", "-d", - "--pid-file", opt_pid_file, - NULL); - } else { - add_argv(runtime_argv, - "create", - "--bundle", opt_bundle_path, - "--pid-file", opt_pid_file, - NULL); - } - - if (!opt_exec && opt_no_pivot) { - add_argv(runtime_argv, - "--no-pivot", - NULL); - } - - if (csname != NULL) { - add_argv(runtime_argv, - "--console-socket", csname, - NULL); - } - - /* Set the exec arguments. */ - if (opt_exec) { - add_argv(runtime_argv, - "--process", opt_exec_process_spec, - NULL); - } - - /* Container name comes last. */ - add_argv(runtime_argv, opt_cid, NULL); - end_argv(runtime_argv); - - /* - * We have to fork here because the current runC API dups the stdio of the - * calling process over the container's fds. This is actually *very bad* - * but is currently being discussed for change in - * https://github.com/opencontainers/runtime-spec/pull/513. Hopefully this - * won't be the case for very long. - */ - - /* Create our container. */ - create_pid = fork(); - if (create_pid < 0) { - pexit("Failed to fork the create command"); - } else if (!create_pid) { - /* FIXME: This results in us not outputting runc error messages to crio's log. */ - if (slavefd_stdin < 0) - slavefd_stdin = dev_null_r; - if (dup2(slavefd_stdin, STDIN_FILENO) < 0) - pexit("Failed to dup over stdout"); - - if (slavefd_stdout < 0) - slavefd_stdout = dev_null_w; - if (dup2(slavefd_stdout, STDOUT_FILENO) < 0) - pexit("Failed to dup over stdout"); - - if (slavefd_stderr < 0) - slavefd_stderr = slavefd_stdout; - if (dup2(slavefd_stderr, STDERR_FILENO) < 0) - pexit("Failed to dup over stderr"); - - execv(g_ptr_array_index(runtime_argv,0), (char **)runtime_argv->pdata); - exit(127); - } - - g_ptr_array_free (runtime_argv, TRUE); - - /* The runtime has that fd now. We don't need to touch it anymore. */ - close(slavefd_stdin); - close(slavefd_stdout); - close(slavefd_stderr); - - /* Map pid to its handler. */ - GHashTable *pid_to_handler = g_hash_table_new (g_int_hash, g_int_equal); - g_hash_table_insert (pid_to_handler, &create_pid, runtime_exit_cb); - - /* - * Glib does not support SIGCHLD so use SIGUSR1 with the same semantic. We will - * catch SIGCHLD and raise(SIGUSR1) in the signal handler. - */ - g_unix_signal_add (SIGUSR1, on_sigusr1_cb, pid_to_handler); - - if (signal(SIGCHLD, on_sigchld) == SIG_ERR) - pexit("Failed to set handler for SIGCHLD"); - - ninfo("about to waitpid: %d", create_pid); - if (csname != NULL) { - guint terminal_watch = g_unix_fd_add (console_socket_fd, G_IO_IN, terminal_accept_cb, csname); - /* Process any SIGCHLD we may have missed before the signal handler was in place. */ - check_child_processes (pid_to_handler); - g_main_loop_run (main_loop); - g_source_remove (terminal_watch); - } else { - int ret; - /* Wait for our create child to exit with the return code. */ - do - ret = waitpid(create_pid, &runtime_status, 0); - while (ret < 0 && errno == EINTR); - if (ret < 0) { - int old_errno = errno; - kill(create_pid, SIGKILL); - errno = old_errno; - pexit("Failed to wait for `runtime %s`", opt_exec ? "exec" : "create"); - } - - } - - if (!WIFEXITED(runtime_status) || WEXITSTATUS(runtime_status) != 0) { - if (sync_pipe_fd > 0) { - /* - * Read from container stderr for any error and send it to parent - * We send -1 as pid to signal to parent that create container has failed. - */ - num_read = read(masterfd_stderr, buf, BUF_SIZE); - if (num_read > 0) { - buf[num_read] = '\0'; - write_sync_fd(sync_pipe_fd, -1, buf); - } - } - nexit("Failed to create container: exit status %d", WEXITSTATUS(runtime_status)); - } - - if (opt_terminal && masterfd_stdout == -1) - nexit("Runtime did not set up terminal"); - - /* Read the pid so we can wait for the process to exit */ - g_file_get_contents(opt_pid_file, &contents, NULL, &err); - if (err) { - nwarn("Failed to read pidfile: %s", err->message); - g_error_free(err); - exit(1); - } - - container_pid = atoi(contents); - ninfo("container PID: %d", container_pid); - - g_hash_table_insert (pid_to_handler, &container_pid, container_exit_cb); - - /* Setup endpoint for attach */ - _cleanup_free_ char *attach_symlink_dir_path = NULL; - if (!opt_exec) { - attach_symlink_dir_path = setup_attach_socket(); - } - - if (!opt_exec) { - setup_terminal_control_fifo(); - } - - /* Send the container pid back to parent */ - if (!opt_exec) { - write_sync_fd(sync_pipe_fd, container_pid, NULL); - } - - setup_oom_handling(container_pid); - - if (masterfd_stdout >= 0) { - g_unix_fd_add (masterfd_stdout, G_IO_IN, stdio_cb, GINT_TO_POINTER(STDOUT_PIPE)); - } - if (masterfd_stderr >= 0) { - g_unix_fd_add (masterfd_stderr, G_IO_IN, stdio_cb, GINT_TO_POINTER(STDERR_PIPE)); - } - - if (opt_timeout > 0) { - g_timeout_add_seconds (opt_timeout, timeout_cb, NULL); - } - - check_child_processes(pid_to_handler); - - g_main_loop_run (main_loop); - - /* Drain stdout and stderr */ - if (masterfd_stdout != -1) { - g_unix_set_fd_nonblocking(masterfd_stdout, TRUE, NULL); - while (read_stdio(masterfd_stdout, STDOUT_PIPE, NULL)) - ; - } - if (masterfd_stderr != -1) { - g_unix_set_fd_nonblocking(masterfd_stderr, TRUE, NULL); - while (read_stdio(masterfd_stderr, STDERR_PIPE, NULL)) - ; - } - - int exit_status = -1; - const char *exit_message = NULL; - - if (timed_out) { - kill(container_pid, SIGKILL); - exit_message = "command timed out"; - } else { - exit_status = WEXITSTATUS(container_status); - } - - if (!opt_exec) { - _cleanup_free_ char *status_str = g_strdup_printf("%d", exit_status); - _cleanup_free_ char *exit_file_path = g_build_filename(opt_exit_dir, opt_cid, NULL); - if (!g_file_set_contents(exit_file_path, status_str, -1, &err)) - nexit("Failed to write %s to exit file: %s\n", - status_str, err->message); - } else { - /* Send the command exec exit code back to the parent */ - write_sync_fd(sync_pipe_fd, exit_status, exit_message); - } - - if (attach_symlink_dir_path != NULL && - unlink(attach_symlink_dir_path) == -1 && errno != ENOENT) { - pexit("Failed to remove symlink for attach socket directory"); - } - - return EXIT_SUCCESS; -} |