76 lines
2 KiB
C
76 lines
2 KiB
C
/* File descriptor passing based on
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* https://manned.org/man.c2c6968a/cmsg.3 */
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static ssize_t fufdpass_send(int socket, int fd, const char *buf, size_t buflen) {
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union {
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char buf[CMSG_SPACE(sizeof(int))];
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struct cmsghdr align;
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} cmsgbuf = {};
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struct iovec iov;
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iov.iov_base = (char *)buf;
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iov.iov_len = buflen;
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struct msghdr msg;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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msg.msg_flags = 0;
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
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return sendmsg(socket, &msg, 0);
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}
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static int fufdpass_recv(pTHX_ I32 ax, int socket, size_t len) {
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if (GIMME_V != G_LIST)
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fu_confess("Invalid use of fdpass_recv() in scalar context");
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union {
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char buf[CMSG_SPACE(sizeof(int))];
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struct cmsghdr align;
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} cmsgbuf;
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SV *buf = sv_2mortal(newSV(len));
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SvPOK_only(buf);
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struct iovec iov;
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iov.iov_base = SvPVX(buf);
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iov.iov_len = len;
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struct msghdr msg;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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msg.msg_flags = 0;
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ssize_t r = recvmsg(socket, &msg, 0);
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if (r < 0) {
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ST(0) = &PL_sv_undef;
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ST(1) = &PL_sv_undef;
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return 2;
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}
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET
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|| cmsg->cmsg_type != SCM_RIGHTS || cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
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ST(0) = &PL_sv_undef;
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} else {
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int fd;
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memcpy(&fd, CMSG_DATA(cmsg), sizeof(int));
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ST(0) = sv_2mortal(newSViv(fd));
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}
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SvCUR_set(buf, r);
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ST(1) = buf;
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return 2;
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}
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