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#include <assert.h>
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#include <errno.h> // ENOMEM
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daemon_handle daemon_open(daemon_info i) {
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daemon_handle daemon_open(daemon_info i)
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daemon_handle h = { .protocol_version = 0, .error = 0 };
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daemon_reply r = { 0 };
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struct sockaddr_un sockaddr = { .sun_family = AF_UNIX };
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if ((h.socket_fd = socket(PF_UNIX, SOCK_STREAM /* | SOCK_NONBLOCK */, 0)) < 0)
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log_debug("%s: Opening daemon socket to %s for protocol %s version %d.",
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i.socket, i.path, i.protocol, i.protocol_version);
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if ((h.socket_fd = socket(PF_UNIX, SOCK_STREAM /* | SOCK_NONBLOCK */, 0)) < 0) {
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log_sys_error("socket", i.socket);
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if (!dm_strncpy(sockaddr.sun_path, i.socket, sizeof(sockaddr.sun_path))) {
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fprintf(stderr, "%s: daemon socket path too long.\n", i.socket);
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if (connect(h.socket_fd,(struct sockaddr *) &sockaddr, sizeof(sockaddr)))
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log_error("%s: Daemon socket path too long.", i.socket);
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if (connect(h.socket_fd,(struct sockaddr *) &sockaddr, sizeof(sockaddr))) {
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log_sys_error("connect", i.socket);
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log_debug("Sending daemon %s: hello", i.path);
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r = daemon_send_simple(h, "hello", NULL);
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if (r.error || strcmp(daemon_reply_str(r, "response", "unknown"), "OK"))
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if (r.error || strcmp(daemon_reply_str(r, "response", "unknown"), "OK")) {
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log_error("Daemon %s returned error %d", i.path, r.error);
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/* Check protocol and version matches */
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h.protocol = daemon_reply_str(r, "protocol", NULL);
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h.protocol = dm_strdup(h.protocol); /* keep around */
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h.protocol_version = daemon_reply_int(r, "version", 0);
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if (i.protocol && (!h.protocol || strcmp(h.protocol, i.protocol)))
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if (i.protocol_version && h.protocol_version != i.protocol_version)
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if (i.protocol && (!h.protocol || strcmp(h.protocol, i.protocol))) {
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log_error("Daemon %s: requested protocol %s != %s",
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i.path, i.protocol, h.protocol ? : "");
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if (i.protocol_version && h.protocol_version != i.protocol_version) {
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log_error("Daemon %s: requested protocol version %d != %d",
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i.path, i.protocol_version, h.protocol_version);
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daemon_reply_destroy(r);
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if (h.socket_fd >= 0)
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if (close(h.socket_fd))
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log_sys_error("close", "daemon_open");