All notable changes to this project will be documented in this file.
The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.
4.9.1 - 2025-05-28
- meson: use boolean defaults for boolean options !149
- meson: specify that C++ is only used for host binaries !149
- meson: add dependency override for libslirp !150
- Do not link tests with libslirp.map #84
- apple: Fix getting IPv4 DNS server address when IPv4 and IPv4 are interleaved #85
- Windows: Fix ICMP generation #87 #88
- tcp: Fix starting the linger2 timer on socket shutdown #86
- tcp: on input, reset TCPT_KEEP to TCPTV_KEEP_IDLE rather than TCPTV_KEEPINTVL
- tcp: on input during init, reset TCPT_KEEP to TCPTV_KEEP_INIT
- tcp: Reduce linger time to two minutes
4.9.0 - 2025-01-30
- Add SlirpAddPollSocketCb and {,un}register_poll_socket that can be used from SLIRP_CONFIG_VERSION_MAX 6 to properly support socket handles on win64.
- bootp: Fill siaddr with tftp addr as per RFC2131 !135
- tcp_listen: Fix host forwarding on Windows !137
- tftp: Fix address returned in proxying #82 !147
- Fix build on mold #77
- Fix static linking !134
- slirp_os_socket abstraction for Windows !136
- cksum: Update implementation to include 64-bit computation support !144
- reduce compilation warnings on Windows !143
4.8.0 - 2024-05-09
- tcp: Fix testing for last fragment
- tftp: Fix use-after-free
- Add support for Haiku !123
- ncsi: Add manufacturer's ID !122
- ncsi: Add Get Version ID command !122
- ncsi: Add out-of-band ethernet address !125
- ncsi: Add Mellanox Get Mac Address handler !125
- icmp6: Add echo request forwarding support
- Add fuzzing infrastructure
- Fix missing cleanups
- windows: Build fixes
- ipv6: Use target address from Neighbor Advertisement !129
- dns: Reject domain-search when any entry ends with ".."
- dns: Use localhost as dns when /etc/resolv.conf empty !130
- icmp: Handle ICMP packets as IPPROTO_IP on BSD !133
- eth: pad ethernet frames to 60 bytes #34
- windows: Bump the minimum Windows version to Windows 7
4.7.0 - 2022-04-26
- Allow disabling the internal DHCP server !22
- icmp: Support falling back on trying a SOCK_RAW socket !92
- Support Unix sockets in hostfwd !103
- IPv6 DNS proxying support !110
- bootp: add support for UEFI HTTP boot !111
- New callback that supports CFI better !117
- dhcp: Always send DHCP_OPT_LEN bytes in options !97
- Fix Haiku build !98 !99
- Fix memory leak when using libresolv !100
- Ensure sin6_scope_id is zero for global addresses !102
- resolv: fix IPv6 resolution on Darwin !104
- socket: Initialize so_type in socreate !109
- Handle ECONNABORTED from recv !116
4.6.1 - 2021-06-18
- Fix DHCP regression introduced in 4.6.0. !95
4.6.0 - 2021-06-14
- mbuf: Add debugging helpers for allocation. !90
- Revert "Set macOS deployment target to macOS 10.4". !93
- mtod()-related buffer overflows (CVE-2021-3592 #44, CVE-2021-3593 #45, CVE-2021-3594 #47, CVE-2021-3595 #46).
- poll_fd: add missing fd registration for UDP and ICMP
- ncsi: make ncsi_calculate_checksum work with unaligned data. !89
- Various typos and doc fixes. !88
4.5.0 - 2021-05-18
- IPv6 forwarding. !62 !75 !77
- slirp_neighbor_info() to dump the ARP/NDP tables. !71
- Lazy guest address resolution for IPv6. !81
- Improve signal handling when spawning a child. !61
- Set macOS deployment target to macOS 10.4. !72
- slirp_add_hostfwd: Ensure all error paths set errno. !80
- More API documentation.
- Assertion failure on unspecified IPv6 address. !86
- Disable polling for PRI on MacOS, fixing some closing streams issues. !73
- Various memory leak fixes on fastq/batchq. !68
- Memory leak on IPv6 fast-send. !67
- Slow socket response on Windows. !64
- Misc build and code cleanups. !60 !63 !76 !79 !84
4.4.0 - 2020-12-02
- udp, udp6, icmp: handle TTL value. !48
- Enable forwarding ICMP errors. !49
- Add DNS resolving for iOS. !54
- Improve meson subproject() support. !53
- Removed Makefile-based build system. !56
- socket: consume empty packets. !55
- check pkt_len before reading protocol header (CVE-2020-29129). !57
- ip_stripoptions use memmove (fixes undefined behaviour). !47
- various Coverity-related changes/fixes.
4.3.1 - 2020-07-08
- A silent truncation could occur in
slirp_fmt(), which will now print a critical message. See also #22.
- CVE-2020-10756 - Drop bogus IPv6 messages that could lead to data leakage. See !44 and !42.
- Fix win32 builds by using the SLIRP_PACKED definition.
- Various coverity scan errors fixed. !41
- Fix new GCC warnings. !43
4.3.0 - 2020-04-22
SLIRP_VERSION_STRINGmacro, with the git sha suffix when building from gitSlirpConfig.disable_dns, to disable DNS redirection #16
slirp_version_string()now has the git sha suffix when building form git- Limit DNS redirection to port 53 #16
- Fix build regression with mingw & NetBSD
- Fix use-afte-free in
ip_reass()(CVE-2020-1983)
4.2.0 - 2020-03-17
- New API function
slirp_add_unix: add a forward rule to a Unix socket. - New API function
slirp_remove_guestfwd: remove a forward rule previously added byslirp_add_exec,slirp_add_unixorslirp_add_guestfwd - New
SlirpConfig.outbound_addr{,6}fields to bind output socket to a specific address
- socket: do not fallback on host loopback if
get_dns_addr()failed or the address is in slirp network
- ncsi: fix checksum OOB memory access
tcp_emu(): fix OOB accesses- tftp: restrict relative path access
- state: fix loading of guestfwd state
4.1.0 - 2019-12-02
- The
slirp_new()API, simpler and more extensible thanslirp_init(). - Allow custom MTU configuration.
- Option to disable host loopback connections.
- CI now runs scan-build too.
- Disable
tcp_emu()by default.tcp_emu()is known to have caused several CVEs, and not useful today in most cases. The feature can be still enabled by settingSlirpConfig.enable_emuto true. - meson build system is now
subproject()friendly. - Replace remaining
malloc()/free()with glib (which aborts on OOM) - Various code cleanups.
- The
slirp_init()API.
getpeername()error aftershutdown(SHUT_WR).- Exec forward: correctly parse command lines that contain spaces.
- Allow 0.0.0.0 destination address.
- Make host receive broadcast packets.
- Various memory related fixes (heap overflow, leaks, NULL dereference).
- Compilation warnings, dead code.
4.0.0 - 2019-05-24
- Installable as a shared library.
- meson build system (& make build system for in-tree QEMU integration)
- Standalone project, removing any QEMU dependency.
- License clarifications.