141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
#include <assert.h>
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#include <ccan/err/err.h>
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#include <ccan/str/str.h>
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#include <common/dev_disconnect.h>
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#include <common/status.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <wire/gen_peer_wire.h>
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#if DEVELOPER
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/* We move the fd if and only if we do a disconnect. */
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static int dev_disconnect_fd = -1;
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static char dev_disconnect_line[200];
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static int dev_disconnect_count, dev_disconnect_len;
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static bool dev_disconnect_nocommit;
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bool dev_suppress_commit;
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static void next_dev_disconnect(void)
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{
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int r;
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char *asterisk;
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r = read(dev_disconnect_fd,
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dev_disconnect_line, sizeof(dev_disconnect_line)-1);
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if (r < 0)
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err(1, "Reading dev_disconnect file");
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if (lseek(dev_disconnect_fd, -r, SEEK_CUR) < 0) {
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err(1, "lseek failure");
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}
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/* Get first line */
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dev_disconnect_line[r] = '\n';
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dev_disconnect_len = strcspn(dev_disconnect_line, "\n");
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dev_disconnect_line[dev_disconnect_len] = '\0';
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if (strends(dev_disconnect_line, "-nocommit")) {
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dev_disconnect_line[strlen(dev_disconnect_line)
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- strlen("-nocommit")] = '\0';
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dev_disconnect_nocommit = true;
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} else
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dev_disconnect_nocommit = false;
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asterisk = strchr(dev_disconnect_line, '*');
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if (asterisk) {
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dev_disconnect_count = atoi(asterisk+1);
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if (dev_disconnect_count < 1)
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errx(1, "dev_disconnect invalid count: %s",
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dev_disconnect_line);
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*asterisk = '\0';
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} else
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dev_disconnect_count = 1;
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}
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void dev_disconnect_init(int fd)
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{
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/* So we can move forward if we do use the line. */
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dev_disconnect_fd = fd;
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}
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enum dev_disconnect dev_disconnect(int pkt_type)
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{
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if (dev_disconnect_fd == -1)
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return DEV_DISCONNECT_NORMAL;
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if (!dev_disconnect_count)
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next_dev_disconnect();
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if (!streq(wire_type_name(pkt_type), dev_disconnect_line+1))
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return DEV_DISCONNECT_NORMAL;
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if (--dev_disconnect_count != 0) {
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return DEV_DISCONNECT_NORMAL;
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}
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if (lseek(dev_disconnect_fd, dev_disconnect_len+1, SEEK_CUR) < 0) {
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err(1, "lseek failure");
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}
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status_trace("dev_disconnect: %s%s", dev_disconnect_line,
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dev_disconnect_nocommit ? "-nocommit" : "");
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if (dev_disconnect_nocommit)
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dev_suppress_commit = true;
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return dev_disconnect_line[0];
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}
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void dev_sabotage_fd(int fd)
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{
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int fds[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) != 0)
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err(1, "dev_sabotage_fd: creating socketpair");
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/* Close one. */
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close(fds[0]);
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/* Move other over to the fd we want to sabotage. */
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dup2(fds[1], fd);
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close(fds[1]);
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}
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/* Replace fd with blackhole until dev_disconnect file is truncated. */
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void dev_blackhole_fd(int fd)
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{
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int fds[2];
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int i;
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struct stat st;
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) != 0)
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err(1, "dev_blackhole_fd: creating socketpair");
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switch (fork()) {
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case -1:
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err(1, "dev_blackhole_fd: forking");
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case 0:
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/* Close everything but the dev_disconnect_fd, the socket
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* which is pretending to be the peer, and stderr. */
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for (i = 0; i < sysconf(_SC_OPEN_MAX); i++)
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if (i != fds[0]
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&& i != dev_disconnect_fd
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&& i != STDERR_FILENO)
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close(i);
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/* Close once dev_disconnect file is truncated. */
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for (;;) {
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if (fstat(dev_disconnect_fd, &st) != 0)
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err(1, "fstat of dev_disconnect_fd failed");
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if (st.st_size == 0)
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_exit(0);
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sleep(1);
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}
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}
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close(fds[0]);
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dup2(fds[1], fd);
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close(fds[1]);
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}
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#endif
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