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openSUSE:12.2
kvm
kvm-studio-slirp-nooutgoing.patch
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File kvm-studio-slirp-nooutgoing.patch of Package kvm
Index: qemu-kvm-0.15.rc0/vl.c =================================================================== --- qemu-kvm-0.15.rc0.orig/vl.c +++ qemu-kvm-0.15.rc0/vl.c @@ -213,6 +213,7 @@ const char *vnc_display; int acpi_enabled = 1; int no_hpet = 0; int fd_bootchk = 1; +int slirp_nooutgoing = 0; int no_reboot = 0; int no_shutdown = 0; int cursor_hide = 1; @@ -2497,6 +2498,14 @@ int main(int argc, char **argv, char **e case QEMU_OPTION_singlestep: singlestep = 1; break; + case QEMU_OPTION_nooutgoing: + slirp_nooutgoing = inet_addr(optarg); + if (slirp_nooutgoing == INADDR_NONE) { + printf("Invalid address: %s.\nOnly addresses of the format " + "xxx.xxx.xxx.xxx are supported.\n", optarg); + exit(1); + } + break; case QEMU_OPTION_S: autostart = 0; break; Index: qemu-kvm-0.15.rc0/slirp/tcp_subr.c =================================================================== --- qemu-kvm-0.15.rc0.orig/slirp/tcp_subr.c +++ qemu-kvm-0.15.rc0/slirp/tcp_subr.c @@ -317,6 +317,9 @@ tcp_sockclosed(struct tcpcb *tp) * nonblocking. Connect returns after the SYN is sent, and does * not wait for ACK+SYN. */ + +extern int slirp_nooutgoing; + int tcp_fconnect(struct socket *so) { Slirp *slirp = so->slirp; @@ -325,6 +328,11 @@ int tcp_fconnect(struct socket *so) DEBUG_CALL("tcp_fconnect"); DEBUG_ARG("so = %lx", (long )so); + if (slirp_nooutgoing) { + errno = EHOSTUNREACH; + return -1; + } + if( (ret = so->s = qemu_socket(AF_INET,SOCK_STREAM,0)) >= 0) { int opt, s=so->s; struct sockaddr_in addr; @@ -417,6 +425,13 @@ tcp_connect(struct socket *inso) tcp_close(sototcpcb(so)); /* This will sofree() as well */ return; } + + if (slirp_nooutgoing && addr.sin_addr.s_addr != slirp_nooutgoing) { + tcp_close(sototcpcb(so)); /* This will sofree() as well */ + close(s); + return; + } + socket_set_nonblock(s); opt = 1; setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); @@ -427,6 +442,7 @@ tcp_connect(struct socket *inso) so->so_fport = addr.sin_port; so->so_faddr = addr.sin_addr; + /* Translate connections from localhost to the real hostname */ if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr) so->so_faddr = slirp->vhost_addr; Index: qemu-kvm-0.15.rc0/slirp/socket.c =================================================================== --- qemu-kvm-0.15.rc0.orig/slirp/socket.c +++ qemu-kvm-0.15.rc0/slirp/socket.c @@ -531,6 +531,8 @@ sorecvfrom(struct socket *so) } /* if ping packet */ } +extern int slirp_nooutgoing; + /* * sendto() a socket */ @@ -561,6 +563,12 @@ sosendto(struct socket *so, struct mbuf DEBUG_MISC((dfd, " sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n", ntohs(addr.sin_port), inet_ntoa(addr.sin_addr))); + /* Only allow DNS requests */ + if (slirp_nooutgoing && ntohs(addr.sin_port) != 53) { + errno = EHOSTUNREACH; + return -1; + } + /* Don't care what port we get */ ret = sendto(so->s, m->m_data, m->m_len, 0, (struct sockaddr *)&addr, sizeof (struct sockaddr)); Index: qemu-kvm-0.15.rc0/qemu-options.hx =================================================================== --- qemu-kvm-0.15.rc0.orig/qemu-options.hx +++ qemu-kvm-0.15.rc0/qemu-options.hx @@ -1991,6 +1991,16 @@ Store the QEMU process PID in @var{file} from a script. ETEXI +DEF("nooutgoing", HAS_ARG, QEMU_OPTION_nooutgoing, \ + "-nooutgoing <IP>\n" \ + " incoming traffic only from IP, no outgoing\n", \ + QEMU_ARCH_ALL) +STEXI +@item -nooutgoing +Forbid userspace networking to make outgoing connections. Only accept incoming +connections from ip address IP. +ETEXI + DEF("singlestep", 0, QEMU_OPTION_singlestep, \ "-singlestep always run in singlestep mode\n", QEMU_ARCH_ALL) STEXI
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