df7a86ed73
Currently the qemu user-mode networking stack reads the host DNS configuration (/etc/resolv.conf or the Windows equivalent) only once when qemu starts. This causes name lookups in the guest to fail if the host is moved to a different network from which the original DNS servers are unreachable, a common occurrence when the host is a laptop. This patch changes the slirp code to read the host DNS configuration on demand, caching the results for at most 1 second to avoid unnecessary overhead if name lookups occur in rapid succession. On non-Windows hosts, /etc/resolv.conf is re-read only if the file has been replaced or if its size or mtime has changed. Signed-off-by: Ed Swierk <eswierk@aristanetworks.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
57 lines
2 KiB
C
57 lines
2 KiB
C
#ifndef _LIBSLIRP_H
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#define _LIBSLIRP_H
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#include <qemu-common.h>
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#ifdef CONFIG_SLIRP
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struct Slirp;
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typedef struct Slirp Slirp;
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int get_dns_addr(struct in_addr *pdns_addr);
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Slirp *slirp_init(int restricted, struct in_addr vnetwork,
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struct in_addr vnetmask, struct in_addr vhost,
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const char *vhostname, const char *tftp_path,
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const char *bootfile, struct in_addr vdhcp_start,
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struct in_addr vnameserver, void *opaque);
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void slirp_cleanup(Slirp *slirp);
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void slirp_select_fill(int *pnfds,
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fd_set *readfds, fd_set *writefds, fd_set *xfds);
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void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds,
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int select_error);
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void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len);
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/* you must provide the following functions: */
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int slirp_can_output(void *opaque);
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void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len);
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int slirp_add_hostfwd(Slirp *slirp, int is_udp,
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struct in_addr host_addr, int host_port,
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struct in_addr guest_addr, int guest_port);
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int slirp_remove_hostfwd(Slirp *slirp, int is_udp,
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struct in_addr host_addr, int host_port);
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int slirp_add_exec(Slirp *slirp, int do_pty, const void *args,
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struct in_addr *guest_addr, int guest_port);
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void slirp_connection_info(Slirp *slirp, Monitor *mon);
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void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr,
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int guest_port, const uint8_t *buf, int size);
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size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
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int guest_port);
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#else /* !CONFIG_SLIRP */
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static inline void slirp_select_fill(int *pnfds, fd_set *readfds,
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fd_set *writefds, fd_set *xfds) { }
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static inline void slirp_select_poll(fd_set *readfds, fd_set *writefds,
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fd_set *xfds, int select_error) { }
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#endif /* !CONFIG_SLIRP */
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#endif
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