Date: Sun, 9 Aug 2020 16:30:56 +0300 From: Pavel Timofeev <timp87@gmail.com> To: ports-list freebsd <freebsd-ports@freebsd.org> Subject: Re: Crashing net/microsocks if DNS being proxied Message-ID: <CAAoTqfvqAq5p_uXx35PSSWK-14zxXK4SdJ=b1fGhfW_%2BS443Gw@mail.gmail.com> In-Reply-To: <CAAoTqftaQsiUhvR9tG13QpL6Reris1B6Z1wr8srMnPDUadtFPA@mail.gmail.com> References: <CAAoTqftaQsiUhvR9tG13QpL6Reris1B6Z1wr8srMnPDUadtFPA@mail.gmail.com>
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Pavel Timofeev <timp87@gmail.com>: > Hello > > I'd like to take advantage of net/microsocks port - a small SOCKSv5 server. > It's v1.0.1 (https://github.com/rofl0r/microsocks/tree/v1.0.1) under 12.1 > RELEASE amd64. > It works OK with firefox until I ask firefox to proxy DNS via socks also. > It cashes after getaddrinfo() call. > I have quite poor C knowledge and I can't understand what's wrong with it. > Parameters passed to getaddrinfo() looks OK > Can anybody advise where to look at also? > > > > $ gdb92 microsocks microsocks.core > > > GNU gdb (GDB) 9.2 [GDB v9.2 for FreeBSD] > > Copyright (C) 2020 Free Software Foundation, Inc. > > License GPLv3+: GNU GPL version 3 or later < > http://gnu.org/licenses/gpl.html>; > > > This is free software: you are free to change and redistribute it. > > > There is NO WARRANTY, to the extent permitted by law. > > > Type "show copying" and "show warranty" for details. > > This GDB was configured as "x86_64-portbld-freebsd12.1". > > > Type "show configuration" for configuration details. > > For bug reporting instructions, please see: > > <http://www.gnu.org/software/gdb/bugs/>. > > Find the GDB manual and other documentation resources online at: > > > <http://www.gnu.org/software/gdb/documentation/>. > > > > For help, type "help". > Type "apropos word" to search for commands related to "word"... > > > Reading symbols from microsocks... > > [New LWP 100579] > [New LWP 100347] > Core was generated by `./microsocks'. > > Program terminated with signal SIGSEGV, Segmentation fault. > > > #0 0x00000008003e5467 in _getht (hostf=0x7fffdfffd238, > name=0x7fffdfffda20 "freebsd.org", > > > pai=0x7fffdfffd5a0, cur=0x7fffdfffd240) at > /usr/src/lib/libc/net/getaddrinfo.c:2476 > > > 2476 { > [Current thread is 1 (LWP 100579)] > > (gdb) bt > #0 0x00000008003e5467 in _getht (hostf=0x7fffdfffd238, > name=0x7fffdfffda20 "freebsd.org", pai=0x7fffdfffd5a0, > cur=0x7fffdfffd240) at /usr/src/lib/libc/net/getaddrinfo.c:2476 > #1 0x00000008003e4990 in _files_getaddrinfo (rv=0x7fffdfffd670, > cb_data=<optimized out>, ap=<optimized out>) at > /usr/src/lib/libc/net/getaddrinfo.c:2515 > #2 0x000000080040df6c in _nsdispatch (retval=0x7fffdfffd670, > disp_tab=0x8004482e0, database=<optimized out>, method_name=0x8002bafb7 > "getaddrinfo", defaults=<optimized out>) > at /usr/src/lib/libc/net/nsdispatch.c:716 > #3 0x00000008003e30b3 in explore_fqdn (pai=0x1, hostname=<optimized out>, > servname=0x7fffdfffd860 "80", res=<optimized out>) at > /usr/src/lib/libc/net/getaddrinfo.c:1945 > #4 getaddrinfo (hostname=<optimized out>, servname=0x7fffdfffd860 "80", > hints=<optimized out>, res=0x7fffdfffda18) at > /usr/src/lib/libc/net/getaddrinfo.c:576 > #5 0x00000000002037f6 in resolve (host=0x7fffdfffda20 "freebsd.org", > port=80, addr=0x7fffdfffda18) at server.c:14 > #6 0x00000000002030e8 in connect_socks_target (buf=0x7fffdfffdba0 > "\005\001", n=18, client=0x800689038) at sockssrv.c:136 > #7 0x00000000002029e3 in clientthread (data=0x800689030) at sockssrv.c:317 > #8 0x000000080025a736 in thread_start (curthread=0x800683500) at > /usr/src/lib/libthr/thread/thr_create.c:292 > #9 0x0000000000000000 in ?? () > Backtrace stopped: Cannot access memory at address 0x7fffdfffe000 > (gdb) f 5 > #5 0x00000000002037f6 in resolve (host=0x7fffdfffda20 "freebsd.org", > port=80, addr=0x7fffdfffda18) at server.c:14 > 14 return getaddrinfo(host, port_buf, &hints, addr); > (gdb) p host > $1 = 0x7fffdfffda20 "freebsd.org" > (gdb) p port_buf > $2 = "80\000\000\b\000\000" > (gdb) p hints > $3 = {ai_flags = 1, ai_family = 0, ai_socktype = 1, ai_protocol = 0, > ai_addrlen = 0, ai_canonname = 0x0, ai_addr = 0x0, ai_next = 0x0} > (gdb) p *addr > $4 = (struct addrinfo *) 0x0 > (gdb) list > 9 .ai_socktype = SOCK_STREAM, > 10 .ai_flags = AI_PASSIVE, > 11 }; > 12 char port_buf[8]; > 13 snprintf(port_buf, sizeof port_buf, "%u", port); > 14 return getaddrinfo(host, port_buf, &hints, addr); > 15 } > 16 > 17 int server_bindtoip(const struct server *server, int fd) { > 18 if(server->bindaddr.v4.sin_family != AF_UNSPEC) > > > > However, it works OK under Linux no matter if DNS proxied or not. > Thank you! > I'm not asking for full debug session, just a few clues or an advice which way to dig probably.
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