mirror of
https://github.com/sheumann/hush.git
synced 2024-08-17 00:29:03 +00:00
614 lines
13 KiB
C
614 lines
13 KiB
C
/* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
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/* TODO: depends on runit_lib.c - review and reduce/eliminate */
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#include <sys/poll.h>
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#include <sys/file.h>
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#include "busybox.h"
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#include "runit_lib.h"
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static int selfpipe[2];
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/* state */
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#define S_DOWN 0
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#define S_RUN 1
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#define S_FINISH 2
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/* ctrl */
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#define C_NOOP 0
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#define C_TERM 1
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#define C_PAUSE 2
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/* want */
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#define W_UP 0
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#define W_DOWN 1
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#define W_EXIT 2
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struct svdir {
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int pid;
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int state;
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int ctrl;
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int want;
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struct taia start;
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int fdlock;
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int fdcontrol;
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int fdcontrolwrite;
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int islog;
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};
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static struct svdir svd[2];
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static int sigterm = 0;
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static int haslog = 0;
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static int pidchanged = 1;
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static int logpipe[2];
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static char *dir;
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#define usage() bb_show_usage()
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static void fatal2_cannot(char *m1, char *m2)
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{
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bb_perror_msg_and_die("%s: fatal: cannot %s%s", dir, m1, m2);
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/* was exiting 111 */
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}
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static void fatal_cannot(char *m)
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{
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fatal2_cannot(m, "");
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/* was exiting 111 */
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}
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static void fatal2x_cannot(char *m1, char *m2)
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{
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bb_error_msg_and_die("%s: fatal: cannot %s%s", dir, m1, m2);
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/* was exiting 111 */
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}
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static void warn_cannot(char *m)
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{
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bb_perror_msg("%s: warning: cannot %s", dir, m);
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}
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static void warnx_cannot(char *m)
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{
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bb_error_msg("%s: warning: cannot %s", dir, m);
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}
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static void stopservice(struct svdir *);
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static void s_child(int sig_no)
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{
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write(selfpipe[1], "", 1);
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}
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static void s_term(int sig_no)
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{
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sigterm = 1;
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write(selfpipe[1], "", 1); /* XXX */
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}
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static char *add_str(char *p, const char *to_add)
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{
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while ((*p = *to_add) != '\0') {
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p++;
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to_add++;
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}
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return p;
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}
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static int open_trunc_or_warn(const char *name)
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{
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int fd = open_trunc(name);
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if (fd < 0)
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bb_perror_msg("%s: warning: cannot open %s",
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dir, name);
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return fd;
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}
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static int rename_or_warn(const char *old, const char *new)
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{
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if (rename(old, new) == -1) {
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bb_perror_msg("%s: warning: cannot rename %s to %s",
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dir, old, new);
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return -1;
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}
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return 0;
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}
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static void update_status(struct svdir *s)
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{
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unsigned long l;
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int fd;
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char status[20];
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/* pid */
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if (pidchanged) {
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fd = open_trunc_or_warn("supervise/pid.new");
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if (fd < 0)
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return;
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if (s->pid) {
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char spid[sizeof(s->pid)*3 + 2];
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int size = sprintf(spid, "%d\n", s->pid);
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write(fd, spid, size);
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}
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close(fd);
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if (s->islog) {
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if (rename_or_warn("supervise/pid.new", "log/supervise/pid"))
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return;
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} else if (rename_or_warn("supervise/pid.new", "supervise/pid")) {
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return;
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}
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pidchanged = 0;
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}
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/* stat */
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fd = open_trunc_or_warn("supervise/stat.new");
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if (fd < -1)
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return;
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{
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char stat_buf[sizeof("finish, paused, got TERM, want down\n")];
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char *p = stat_buf;
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switch (s->state) {
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case S_DOWN:
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p = add_str(p, "down");
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break;
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case S_RUN:
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p = add_str(p, "run");
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break;
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case S_FINISH:
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p = add_str(p, "finish");
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break;
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}
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if (s->ctrl & C_PAUSE) p = add_str(p, ", paused");
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if (s->ctrl & C_TERM) p = add_str(p, ", got TERM");
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if (s->state != S_DOWN)
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switch(s->want) {
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case W_DOWN:
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p = add_str(p, ", want down");
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break;
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case W_EXIT:
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p = add_str(p, ", want exit");
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break;
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}
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*p++ = '\n';
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write(fd, stat_buf, p - stat_buf);
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close(fd);
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}
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if (s->islog) {
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rename_or_warn("supervise/stat.new", "log/supervise/stat");
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} else {
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rename_or_warn("supervise/stat.new", "log/supervise/stat"+4);
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}
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/* supervise compatibility */
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taia_pack(status, &s->start);
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l = (unsigned long)s->pid;
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status[12] = l; l >>=8;
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status[13] = l; l >>=8;
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status[14] = l; l >>=8;
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status[15] = l;
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if (s->ctrl & C_PAUSE)
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status[16] = 1;
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else
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status[16] = 0;
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if (s->want == W_UP)
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status[17] = 'u';
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else
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status[17] = 'd';
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if (s->ctrl & C_TERM)
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status[18] = 1;
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else
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status[18] = 0;
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status[19] = s->state;
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fd = open_trunc_or_warn("supervise/status.new");
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if (fd < 0)
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return;
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l = write(fd, status, sizeof status);
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if (l < 0) {
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warn_cannot("write supervise/status.new");
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close(fd);
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unlink("supervise/status.new");
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return;
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}
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close(fd);
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if (l < sizeof status) {
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warnx_cannot("write supervise/status.new: partial write");
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return;
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}
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if (s->islog) {
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rename_or_warn("supervise/status.new", "log/supervise/status");
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} else {
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rename_or_warn("supervise/status.new", "log/supervise/status"+4);
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}
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}
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static unsigned custom(struct svdir *s, char c)
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{
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int pid;
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int w;
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char a[10];
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struct stat st;
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char *prog[2];
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if (s->islog) return 0;
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memcpy(a, "control/?", 10);
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a[8] = c;
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if (stat(a, &st) == 0) {
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if (st.st_mode & S_IXUSR) {
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pid = fork();
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if (pid == -1) {
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warn_cannot("fork for control/?");
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return 0;
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}
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if (!pid) {
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if (haslog && fd_copy(1, logpipe[1]) == -1)
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warn_cannot("setup stdout for control/?");
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prog[0] = a;
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prog[1] = 0;
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execve(a, prog, environ);
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fatal_cannot("run control/?");
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}
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while (wait_pid(&w, pid) == -1) {
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if (errno == EINTR) continue;
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warn_cannot("wait for child control/?");
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return 0;
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}
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return !wait_exitcode(w);
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}
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}
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else {
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if (errno == ENOENT) return 0;
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warn_cannot("stat control/?");
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}
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return 0;
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}
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static void stopservice(struct svdir *s)
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{
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if (s->pid && ! custom(s, 't')) {
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kill(s->pid, SIGTERM);
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s->ctrl |=C_TERM;
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update_status(s);
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}
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if (s->want == W_DOWN) {
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kill(s->pid, SIGCONT);
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custom(s, 'd'); return;
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}
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if (s->want == W_EXIT) {
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kill(s->pid, SIGCONT);
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custom(s, 'x');
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}
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}
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static void startservice(struct svdir *s)
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{
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int p;
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char *run[2];
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if (s->state == S_FINISH)
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run[0] = "./finish";
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else {
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run[0] = "./run";
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custom(s, 'u');
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}
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run[1] = 0;
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if (s->pid != 0) stopservice(s); /* should never happen */
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while ((p = fork()) == -1) {
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warn_cannot("fork, sleeping");
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sleep(5);
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}
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if (p == 0) {
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/* child */
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if (haslog) {
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if (s->islog) {
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if (fd_copy(0, logpipe[0]) == -1)
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fatal_cannot("setup filedescriptor for ./log/run");
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close(logpipe[1]);
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if (chdir("./log") == -1)
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fatal_cannot("change directory to ./log");
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} else {
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if (fd_copy(1, logpipe[1]) == -1)
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fatal_cannot("setup filedescriptor for ./run");
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close(logpipe[0]);
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}
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}
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sig_uncatch(sig_child);
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sig_unblock(sig_child);
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sig_uncatch(sig_term);
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sig_unblock(sig_term);
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execve(*run, run, environ);
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if (s->islog)
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fatal2_cannot("start log/", *run);
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else
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fatal2_cannot("start ", *run);
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}
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if (s->state != S_FINISH) {
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taia_now(&s->start);
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s->state = S_RUN;
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}
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s->pid = p;
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pidchanged = 1;
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s->ctrl = C_NOOP;
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update_status(s);
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}
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static int ctrl(struct svdir *s, char c)
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{
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switch(c) {
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case 'd': /* down */
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s->want = W_DOWN;
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update_status(s);
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if (s->pid && s->state != S_FINISH) stopservice(s);
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break;
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case 'u': /* up */
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s->want = W_UP;
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update_status(s);
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if (s->pid == 0) startservice(s);
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break;
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case 'x': /* exit */
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if (s->islog) break;
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s->want = W_EXIT;
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update_status(s);
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if (s->pid && s->state != S_FINISH) stopservice(s);
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break;
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case 't': /* sig term */
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if (s->pid && s->state != S_FINISH) stopservice(s);
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break;
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case 'k': /* sig kill */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGKILL);
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s->state = S_DOWN;
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break;
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case 'p': /* sig pause */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGSTOP);
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s->ctrl |=C_PAUSE;
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update_status(s);
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break;
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case 'c': /* sig cont */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGCONT);
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if (s->ctrl & C_PAUSE) s->ctrl &=~C_PAUSE;
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update_status(s);
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break;
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case 'o': /* once */
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s->want = W_DOWN;
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update_status(s);
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if (!s->pid) startservice(s);
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break;
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case 'a': /* sig alarm */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGALRM);
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break;
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case 'h': /* sig hup */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGHUP);
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break;
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case 'i': /* sig int */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGINT);
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break;
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case 'q': /* sig quit */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGQUIT);
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break;
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case '1': /* sig usr1 */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGUSR1);
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break;
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case '2': /* sig usr2 */
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if (s->pid && ! custom(s, c)) kill(s->pid, SIGUSR2);
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break;
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}
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return 1;
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}
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int runsv_main(int argc, char **argv)
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{
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struct stat s;
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int fd;
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int r;
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char buf[256];
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if (!argv[1] || argv[2]) usage();
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dir = argv[1];
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if (pipe(selfpipe) == -1) fatal_cannot("create selfpipe");
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coe(selfpipe[0]);
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coe(selfpipe[1]);
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ndelay_on(selfpipe[0]);
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ndelay_on(selfpipe[1]);
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sig_block(sig_child);
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sig_catch(sig_child, s_child);
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sig_block(sig_term);
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sig_catch(sig_term, s_term);
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xchdir(dir);
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svd[0].pid = 0;
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svd[0].state = S_DOWN;
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svd[0].ctrl = C_NOOP;
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svd[0].want = W_UP;
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svd[0].islog = 0;
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svd[1].pid = 0;
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taia_now(&svd[0].start);
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if (stat("down", &s) != -1) svd[0].want = W_DOWN;
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if (stat("log", &s) == -1) {
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if (errno != ENOENT)
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warn_cannot("stat ./log");
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} else {
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if (!S_ISDIR(s.st_mode))
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warnx_cannot("stat log/down: log is not a directory");
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else {
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haslog = 1;
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svd[1].state = S_DOWN;
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svd[1].ctrl = C_NOOP;
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svd[1].want = W_UP;
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svd[1].islog = 1;
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taia_now(&svd[1].start);
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if (stat("log/down", &s) != -1)
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svd[1].want = W_DOWN;
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if (pipe(logpipe) == -1)
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fatal_cannot("create log pipe");
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coe(logpipe[0]);
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coe(logpipe[1]);
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}
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}
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if (mkdir("supervise", 0700) == -1) {
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r = readlink("supervise", buf, 256);
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if (r != -1) {
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if (r == 256)
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fatal2x_cannot("readlink ./supervise: ", "name too long");
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buf[r] = 0;
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mkdir(buf, 0700);
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} else {
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if ((errno != ENOENT) && (errno != EINVAL))
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fatal_cannot("readlink ./supervise");
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}
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}
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svd[0].fdlock = xopen3("log/supervise/lock"+4,
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O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
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if (lock_exnb(svd[0].fdlock) == -1)
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fatal_cannot("lock supervise/lock");
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coe(svd[0].fdlock);
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if (haslog) {
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if (mkdir("log/supervise", 0700) == -1) {
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r = readlink("log/supervise", buf, 256);
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if (r != -1) {
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if (r == 256)
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fatal2x_cannot("readlink ./log/supervise: ", "name too long");
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buf[r] = 0;
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fd = xopen(".", O_RDONLY|O_NDELAY);
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xchdir("./log");
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mkdir(buf, 0700);
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if (fchdir(fd) == -1)
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fatal_cannot("change back to service directory");
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close(fd);
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}
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else {
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if ((errno != ENOENT) && (errno != EINVAL))
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fatal_cannot("readlink ./log/supervise");
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}
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}
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svd[1].fdlock = xopen3("log/supervise/lock",
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O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
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if (lock_ex(svd[1].fdlock) == -1)
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fatal_cannot("lock log/supervise/lock");
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coe(svd[1].fdlock);
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}
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fifo_make("log/supervise/control"+4, 0600);
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svd[0].fdcontrol = xopen("log/supervise/control"+4, O_RDONLY|O_NDELAY);
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coe(svd[0].fdcontrol);
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svd[0].fdcontrolwrite = xopen("log/supervise/control"+4, O_WRONLY|O_NDELAY);
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coe(svd[0].fdcontrolwrite);
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update_status(&svd[0]);
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if (haslog) {
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fifo_make("log/supervise/control", 0600);
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svd[1].fdcontrol = xopen("log/supervise/control", O_RDONLY|O_NDELAY);
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coe(svd[1].fdcontrol);
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svd[1].fdcontrolwrite = xopen("log/supervise/control", O_WRONLY|O_NDELAY);
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coe(svd[1].fdcontrolwrite);
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update_status(&svd[1]);
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}
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fifo_make("log/supervise/ok"+4, 0600);
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fd = xopen("log/supervise/ok"+4, O_RDONLY|O_NDELAY);
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coe(fd);
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if (haslog) {
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fifo_make("log/supervise/ok", 0600);
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fd = xopen("log/supervise/ok", O_RDONLY|O_NDELAY);
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coe(fd);
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}
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for (;;) {
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iopause_fd x[3];
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struct taia deadline;
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struct taia now;
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char ch;
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if (haslog)
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if (!svd[1].pid && svd[1].want == W_UP)
|
|
startservice(&svd[1]);
|
|
if (!svd[0].pid)
|
|
if (svd[0].want == W_UP || svd[0].state == S_FINISH)
|
|
startservice(&svd[0]);
|
|
|
|
x[0].fd = selfpipe[0];
|
|
x[0].events = IOPAUSE_READ;
|
|
x[1].fd = svd[0].fdcontrol;
|
|
x[1].events = IOPAUSE_READ;
|
|
if (haslog) {
|
|
x[2].fd = svd[1].fdcontrol;
|
|
x[2].events = IOPAUSE_READ;
|
|
}
|
|
taia_now(&now);
|
|
taia_uint(&deadline, 3600);
|
|
taia_add(&deadline, &now, &deadline);
|
|
|
|
sig_unblock(sig_term);
|
|
sig_unblock(sig_child);
|
|
iopause(x, 2+haslog, &deadline, &now);
|
|
sig_block(sig_term);
|
|
sig_block(sig_child);
|
|
|
|
while (read(selfpipe[0], &ch, 1) == 1)
|
|
;
|
|
for (;;) {
|
|
int child;
|
|
int wstat;
|
|
|
|
child = wait_nohang(&wstat);
|
|
if (!child) break;
|
|
if ((child == -1) && (errno != EINTR)) break;
|
|
if (child == svd[0].pid) {
|
|
svd[0].pid = 0;
|
|
pidchanged = 1;
|
|
svd[0].ctrl &=~C_TERM;
|
|
if (svd[0].state != S_FINISH)
|
|
fd = open_read("finish");
|
|
if (fd != -1) {
|
|
close(fd);
|
|
svd[0].state = S_FINISH;
|
|
update_status(&svd[0]);
|
|
continue;
|
|
}
|
|
svd[0].state = S_DOWN;
|
|
taia_uint(&deadline, 1);
|
|
taia_add(&deadline, &svd[0].start, &deadline);
|
|
taia_now(&svd[0].start);
|
|
update_status(&svd[0]);
|
|
if (taia_less(&svd[0].start, &deadline)) sleep(1);
|
|
}
|
|
if (haslog) {
|
|
if (child == svd[1].pid) {
|
|
svd[1].pid = 0;
|
|
pidchanged = 1;
|
|
svd[1].state = S_DOWN;
|
|
svd[1].ctrl &=~C_TERM;
|
|
taia_uint(&deadline, 1);
|
|
taia_add(&deadline, &svd[1].start, &deadline);
|
|
taia_now(&svd[1].start);
|
|
update_status(&svd[1]);
|
|
if (taia_less(&svd[1].start, &deadline)) sleep(1);
|
|
}
|
|
}
|
|
}
|
|
if (read(svd[0].fdcontrol, &ch, 1) == 1)
|
|
ctrl(&svd[0], ch);
|
|
if (haslog)
|
|
if (read(svd[1].fdcontrol, &ch, 1) == 1)
|
|
ctrl(&svd[1], ch);
|
|
|
|
if (sigterm) {
|
|
ctrl(&svd[0], 'x');
|
|
sigterm = 0;
|
|
}
|
|
|
|
if (svd[0].want == W_EXIT && svd[0].state == S_DOWN) {
|
|
if (svd[1].pid == 0)
|
|
_exit(0);
|
|
if (svd[1].want != W_EXIT) {
|
|
svd[1].want = W_EXIT;
|
|
/* stopservice(&svd[1]); */
|
|
update_status(&svd[1]);
|
|
close(logpipe[1]);
|
|
close(logpipe[0]);
|
|
//if (close(logpipe[1]) == -1)
|
|
// warn_cannot("close logpipe[1]");
|
|
//if (close(logpipe[0]) == -1)
|
|
// warn_cannot("close logpipe[0]");
|
|
}
|
|
}
|
|
}
|
|
/* not reached */
|
|
return 0;
|
|
}
|