diff options
Diffstat (limited to 'src/conn-tools/s6-tcpserver6.c')
| -rw-r--r-- | src/conn-tools/s6-tcpserver6.c | 461 |
1 files changed, 87 insertions, 374 deletions
diff --git a/src/conn-tools/s6-tcpserver6.c b/src/conn-tools/s6-tcpserver6.c index 999a564..7cffb54 100644 --- a/src/conn-tools/s6-tcpserver6.c +++ b/src/conn-tools/s6-tcpserver6.c @@ -1,415 +1,128 @@ /* ISC license. */ -#include <skalibs/nonposix.h> #include <sys/types.h> -#include <sys/stat.h> -#include <sys/wait.h> -#include <errno.h> -#include <unistd.h> -#include <fcntl.h> #include <limits.h> -#include <grp.h> -#include <signal.h> -#include <skalibs/gccattributes.h> -#include <skalibs/allreadwrite.h> -#include <skalibs/uint16.h> #include <skalibs/uint.h> #include <skalibs/gidstuff.h> -#include <skalibs/setgroups.h> -#include <skalibs/bytestr.h> #include <skalibs/sgetopt.h> -#include <skalibs/fmtscan.h> #include <skalibs/strerr2.h> -#include <skalibs/env.h> #include <skalibs/djbunix.h> -#include <skalibs/sig.h> -#include <skalibs/selfpipe.h> -#include <skalibs/iopause.h> -#include <skalibs/socket.h> - -#define ABSOLUTE_MAXCONN 1000 - -#define USAGE "s6-tcpserver6 [ -v verbosity ] [ -1 ] [ -c maxconn ] [ -C localmaxconn ] [ -b backlog ] [ -G gid,gid,... ] [ -g gid ] [ -u uid ] [ -U ] ip6 port prog..." - -typedef struct ipnum_s ipnum_t, *ipnum_t_ref ; -struct ipnum_s -{ - char ip[16] ; - unsigned int num ; -} ; -#define IPNUM_ZERO { "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 0 } - -static unsigned int maxconn = 40 ; -static unsigned int localmaxconn = 40 ; -static unsigned int verbosity = 1 ; -static int cont = 1 ; -static ipnum_t_ref pidip = 0 ; -static unsigned int numconn = 0 ; -static ipnum_t_ref ipnum = 0 ; -static unsigned int iplen = 0 ; - -static char fmtmaxconn[UINT_FMT+1] = "/" ; -static char fmtlocalmaxconn[UINT_FMT+1] = "/" ; - - - /* Utility functions */ - -static inline void dieusage () -{ - strerr_dieusage(100, USAGE) ; -} - -static inline void X (void) -{ - strerr_dief1x(101, "internal inconsistency. Please submit a bug-report.") ; -} - - - /* Lookup primitives */ - -static unsigned int lookup_pid (unsigned int pid) -{ - register unsigned int i = 0 ; - for (; i < numconn ; i++) if (pid == pidip[i].num) break ; - return i ; -} - -static unsigned int lookup_ip (char const *ip) -{ - register unsigned int i = 0 ; - for (; i < iplen ; i++) if (!byte_diff(ip, 16, ipnum[i].ip)) break ; - return i ; -} - - - /* Logging */ - -static void log_start (char const *ip, uint16 port) -{ - char fmtip[IP6_FMT] ; - char fmtport[UINT16_FMT] ; - fmtip[ip6_fmt(fmtip, ip)] = 0 ; - fmtport[uint16_fmt(fmtport, port)] = 0 ; - strerr_warni4x("starting - listening on ", fmtip, " port ", fmtport) ; -} - -static inline void log_exit (void) -{ - strerr_warni1x("exiting") ; -} - -static void log_status (void) -{ - char fmt[UINT_FMT] ; - fmt[uint_fmt(fmt, numconn)] = 0 ; - strerr_warni3x("status: ", fmt, fmtmaxconn) ; -} - -static void log_deny (char const *ip, uint16 port, unsigned int num) -{ - char fmtip[IP6_FMT] ; - char fmtport[UINT16_FMT] ; - char fmtnum[UINT_FMT] ; - fmtip[ip6_fmt(fmtip, ip)] = 0 ; - fmtport[uint16_fmt(fmtport, port)] = 0 ; - fmtnum[uint_fmt(fmtnum, num)] = 0 ; - strerr_warni7sys("deny ", fmtip, " port ", fmtport, " count ", fmtnum, fmtlocalmaxconn) ; -} - -static void log_accept (unsigned int pid, char const *ip, uint16 port, unsigned int num) -{ - char fmtipport[IP6_FMT + UINT16_FMT + 6] ; - char fmtpid[UINT_FMT] ; - char fmtnum[UINT_FMT] ; - register unsigned int n ; - n = ip6_fmt(fmtipport, ip) ; - byte_copy(fmtipport + n, 6, " port ") ; n += 6 ; - n += uint16_fmt(fmtipport + n, port) ; - fmtipport[n] = 0 ; - fmtnum[uint_fmt(fmtnum, num)] = 0 ; - fmtpid[uint_fmt(fmtpid, pid)] = 0 ; - strerr_warni7x("allow ", fmtipport, " pid ", fmtpid, " count ", fmtnum, fmtlocalmaxconn) ; -} - -static void log_close (unsigned int pid, char const *ip, int w) -{ - char fmtpid[UINT_FMT] ; - char fmtip[IP6_FMT] = "?" ; - char fmtw[UINT_FMT] ; - fmtpid[uint_fmt(fmtpid, pid)] = 0 ; - fmtip[ip6_fmt(fmtip, ip)] = 0 ; - fmtw[uint_fmt(fmtw, WIFSIGNALED(w) ? WTERMSIG(w) : WEXITSTATUS(w))] = 0 ; - strerr_warni6x("end pid ", fmtpid, " ip ", fmtip, WIFSIGNALED(w) ? " signal " : " exitcode ", fmtw) ; -} - - - /* Signal handling */ - -static void killthem (int sig) -{ - register unsigned int i = 0 ; - for (; i < numconn ; i++) kill(pidip[i].num, sig) ; -} - -static void wait_children (void) -{ - for (;;) - { - unsigned int i ; - int w ; - register int pid = wait_nohang(&w) ; - if (pid < 0) - if (errno != ECHILD) strerr_diefu1sys(111, "wait_nohang") ; - else break ; - else if (!pid) break ; - i = lookup_pid(pid) ; - if (i < numconn) /* it's one of ours ! */ - { - register unsigned int j = lookup_ip(pidip[i].ip) ; - if (j >= iplen) X() ; - if (!--ipnum[j].num) ipnum[j] = ipnum[--iplen] ; - --numconn ; - if (verbosity >= 2) - { - log_close(pid, pidip[i].ip, w) ; - log_status() ; - } - pidip[i] = pidip[numconn] ; - } - } -} - -static void handle_signals (void) -{ - for (;;) switch (selfpipe_read()) - { - case -1 : strerr_diefu1sys(111, "read selfpipe") ; - case 0 : return ; - case SIGCHLD : wait_children() ; break ; - case SIGTERM : - { - if (verbosity >= 2) - strerr_warni3x("received ", "SIGTERM,", " quitting") ; - cont = 0 ; - break ; - } - case SIGHUP : - { - if (verbosity >= 2) - strerr_warni5x("received ", "SIGHUP,", " sending ", "SIGTERM+SIGCONT", " to all connections") ; - killthem(SIGTERM) ; - killthem(SIGCONT) ; - break ; - } - case SIGQUIT : - { - if (verbosity >= 2) - strerr_warni6x("received ", "SIGQUIT,", " sending ", "SIGTERM+SIGCONT", " to all connections", " and quitting") ; - cont = 0 ; - killthem(SIGTERM) ; - killthem(SIGCONT) ; - break ; - } - case SIGABRT : - { - if (verbosity >= 2) - strerr_warni6x("received ", "SIGABRT,", " sending ", "SIGKILL", " to all connections", " and quitting") ; - cont = 0 ; - killthem(SIGKILL) ; - break ; - } - default : X() ; - } -} - - - /* New connection handling */ - -static void run_child (int, char const *, uint16, unsigned int, char const *const *, char const *const *) gccattr_noreturn ; -static void run_child (int s, char const *ip, uint16 port, unsigned int num, char const *const *argv, char const *const *envp) -{ - char fmt[98] ; - unsigned int n = 0 ; - PROG = "s6-tcpserver6 (child)" ; - if ((fd_move(0, s) < 0) || (fd_copy(1, 0) < 0)) - strerr_diefu1sys(111, "move fds") ; - byte_copy(fmt+n, 24, "PROTO=TCP\0TCPREMOTEIP=") ; n += 22 ; - n += ip6_fmt(fmt+n, ip) ; fmt[n++] = 0 ; - byte_copy(fmt+n, 14, "TCPREMOTEPORT=") ; n += 14 ; - n += uint16_fmt(fmt+n, port) ; fmt[n++] = 0 ; - byte_copy(fmt+n, 11, "TCPCONNNUM=") ; n += 11 ; - n += uint_fmt(fmt+n, num) ; fmt[n++] = 0 ; - pathexec_r(argv, envp, env_len(envp), fmt, n) ; - strerr_dieexec(111, argv[0]) ; -} - -static void new_connection (int s, char const *ip, uint16 port, char const *const *argv, char const *const *envp) -{ - unsigned int i = lookup_ip(ip) ; - unsigned int num = (i < iplen) ? ipnum[i].num : 0 ; - register int pid ; - if (num >= localmaxconn) - { - log_deny(ip, port, num) ; - return ; - } - pid = fork() ; - if (pid < 0) - { - if (verbosity) strerr_warnwu1sys("fork") ; - return ; - } - else if (!pid) - { - selfpipe_finish() ; - run_child(s, ip, port, num+1, argv, envp) ; - } - - if (i < iplen) ipnum[i].num = num + 1 ; - else - { - byte_copy(ipnum[iplen].ip, 16, ip) ; - ipnum[iplen++].num = 1 ; - } - pidip[numconn].num = pid ; - byte_copy(pidip[numconn++].ip, 16, ip) ; - if (verbosity >= 2) - { - log_accept(pid, ip, port, ipnum[i].num) ; - log_status() ; - } -} +#include <s6/config.h> +#include <s6-networking/config.h> +#define USAGE "s6-tcpserver6 [ -v verbosity ] [ -d | -D ] [ -1 ] [ -c maxconn ] [ -C localmaxconn ] [ -b backlog ] [ -G gid,gid,... ] [ -g gid ] [ -u uid ] [ -U ] ip port prog..." +#define dieusage() strerr_dieusage(100, USAGE) int main (int argc, char const *const *argv, char const *const *envp) { - iopause_fd x[2] = { { -1, IOPAUSE_READ, 0 }, { -1, IOPAUSE_READ | IOPAUSE_EXCEPT, 0 } } ; + unsigned int verbosity = 1 ; + int flag1 = 0 ; + int flagU = 0 ; + int flagreuse = 1 ; + unsigned int uid = 0, gid = 0 ; + gid_t gids[NGROUPS_MAX] ; + unsigned int gidn = (unsigned int)-1 ; + unsigned int maxconn = 0 ; + unsigned int localmaxconn = 0 ; + unsigned int backlog = (unsigned int)-1 ; PROG = "s6-tcpserver6" ; { subgetopt_t l = SUBGETOPT_ZERO ; - unsigned int uid = 0, gid = 0 ; - gid_t gids[NGROUPS_MAX] ; - unsigned int gidn = 0 ; - unsigned int backlog = 20 ; - char ip[16] ; - int flag1 = 0 ; - uint16 port ; for (;;) { - register int opt = subgetopt_r(argc, argv, "1Uc:C:b:u:g:G:v:", &l) ; + register int opt = subgetopt_r(argc, argv, "Dd1Uv:c:C:b:u:g:G:", &l) ; if (opt == -1) break ; switch (opt) { - case '1' : flag1 = 1 ; break ; - case 'c' : if (!uint0_scan(l.arg, &maxconn)) dieusage() ; break ; - case 'C' : if (!uint0_scan(l.arg, &localmaxconn)) dieusage() ; break ; + case 'D' : flagreuse = 0 ; break ; + case 'd' : flagreuse = 1 ; break ; + case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ; + case 'c' : if (!uint0_scan(l.arg, &maxconn)) dieusage() ; if (!maxconn) maxconn = 1 ; break ; + case 'C' : if (!uint0_scan(l.arg, &localmaxconn)) dieusage() ; if (!localmaxconn) localmaxconn = 1 ; break ; case 'b' : if (!uint0_scan(l.arg, &backlog)) dieusage() ; break ; case 'u' : if (!uint0_scan(l.arg, &uid)) dieusage() ; break ; case 'g' : if (!uint0_scan(l.arg, &gid)) dieusage() ; break ; - case 'G' : if (!gid_scanlist(gids, NGROUPS_MAX, l.arg, &gidn)) dieusage() ; break ; - case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ; - case 'U' : - { - char const *x = env_get2(envp, "UID") ; - if (!x) strerr_dienotset(100, "UID") ; - if (!uint0_scan(x, &uid)) strerr_dieinvalid(100, "UID") ; - x = env_get2(envp, "GID") ; - if (!x) strerr_dienotset(100, "GID") ; - if (!uint0_scan(x, &gid)) strerr_dieinvalid(100, "GID") ; - x = env_get2(envp, "GIDLIST") ; - if (!x) strerr_dienotset(100, "GIDLIST") ; - if (!gid_scanlist(gids, NGROUPS_MAX, x, &gidn) && *x) - strerr_dieinvalid(100, "GIDLIST") ; - break ; - } + case 'G' : if (!gid_scanlist(gids, NGROUPS_MAX, l.arg, &gidn) && *l.arg) dieusage() ; break ; + case '1' : flag1 = 1 ; break ; + case 'U' : flagU = 1 ; uid = 0 ; gid = 0 ; gidn = (unsigned int)-1 ; break ; default : dieusage() ; } } argc -= l.ind ; argv += l.ind ; if (argc < 3) dieusage() ; - if (!ip6_scan(argv[0], ip) || !uint160_scan(argv[1], &port)) dieusage() ; - close(0) ; - if (flag1) + } + + { + unsigned int m = 0 ; + unsigned int pos = 0 ; + char fmt[UINT_FMT * 6 + GID_FMT * NGROUPS_MAX] ; + char const *newargv[24 + argc] ; + newargv[m++] = S6_NETWORKING_BINPREFIX "s6-tcpserver6-socketbinder" ; + if (!flagreuse) newargv[m++] = "-D" ; + if (backlog != (unsigned int)-1) { - if (fcntl(1, F_GETFD) < 0) - strerr_dief1sys(100, "called with option -1 but stdout said") ; + newargv[m++] = "-b" ; + newargv[m++] = fmt + pos ; + pos += uint_fmt(fmt + pos, backlog) ; + fmt[pos++] = 0 ; } - else close(1) ; - if (!maxconn) maxconn = 1 ; - if (maxconn > ABSOLUTE_MAXCONN) maxconn = ABSOLUTE_MAXCONN ; - if (localmaxconn > maxconn) localmaxconn = maxconn ; - x[1].fd = socket_tcp6() ; - if ((x[1].fd == -1) || (coe(x[1].fd) == -1)) - strerr_diefu1sys(111, "create socket") ; - if (socket_bind6_reuse(x[1].fd, ip, port) < 0) - strerr_diefu2sys(111, "bind to ", argv[0]) ; - if (socket_listen(x[1].fd, backlog) == -1) - strerr_diefu1sys(111, "listen") ; - if (gidn && (setgroups(gidn, gids) < 0)) strerr_diefu1sys(111, "setgroups") ; - if (gid && (setgid(gid) < 0)) strerr_diefu1sys(111, "drop gid") ; - if (uid && (setuid(uid) < 0)) strerr_diefu1sys(111, "drop uid") ; - - x[0].fd = selfpipe_init() ; - if (x[0].fd == -1) strerr_diefu1sys(111, "create selfpipe") ; - if (sig_ignore(SIGPIPE) < 0) strerr_diefu1sys(111, "ignore SIGPIPE") ; + newargv[m++] = "--" ; + newargv[m++] = *argv++ ; + newargv[m++] = *argv++ ; + if (flagU || uid || gid || gidn != (unsigned int)-1) { - sigset_t set ; - sigemptyset(&set) ; - sigaddset(&set, SIGCHLD) ; - sigaddset(&set, SIGTERM) ; - sigaddset(&set, SIGHUP) ; - sigaddset(&set, SIGQUIT) ; - sigaddset(&set, SIGABRT) ; - if (selfpipe_trapset(&set) < 0) strerr_diefu1sys(111, "trap signals") ; + newargv[m++] = S6_EXTBINPREFIX "s6-applyuidgid" ; + if (flagU) newargv[m++] = "-Uz" ; + if (uid) + { + newargv[m++] = "-u" ; + newargv[m++] = fmt + pos ; + pos += uint_fmt(fmt + pos, uid) ; + fmt[pos++] = 0 ; + } + if (gid) + { + newargv[m++] = "-g" ; + newargv[m++] = fmt + pos ; + pos += uint_fmt(fmt + pos, gid) ; + fmt[pos++] = 0 ; + } + if (gidn != (unsigned int)-1) + { + newargv[m++] = "-G" ; + newargv[m++] = fmt + pos ; + pos += gid_fmtlist(fmt + pos, gids, gidn) ; + fmt[pos++] = 0 ; + } + newargv[m++] = "--" ; } - if (flag1) + newargv[m++] = S6_NETWORKING_BINPREFIX "s6-tcpserver6d" ; + if (verbosity != 1) { - char fmt[UINT16_FMT] ; - unsigned int n = uint16_fmt(fmt, port) ; - fmt[n++] = '\n' ; - allwrite(1, fmt, n) ; - fd_close(1) ; + newargv[m++] = "-v" ; + newargv[m++] = fmt + pos ; + pos += uint_fmt(fmt + pos, verbosity) ; + fmt[pos++] = 0 ; } - fmtlocalmaxconn[1+uint_fmt(fmtlocalmaxconn+1, localmaxconn)] = 0 ; - if (verbosity >= 2) + if (flag1) newargv[m++] = "-1" ; + if (maxconn) { - fmtmaxconn[1+uint_fmt(fmtmaxconn+1, maxconn)] = 0 ; - log_start(ip, port) ; - log_status() ; + newargv[m++] = "-c" ; + newargv[m++] = fmt + pos ; + pos += uint_fmt(fmt + pos, maxconn) ; + fmt[pos++] = 0 ; } - } - - { - ipnum_t inyostack[maxconn<<1] ; - pidip = inyostack ; ipnum = inyostack + maxconn ; - while (cont) + if (localmaxconn) { - if (iopause_g(x, 1 + (numconn < maxconn), 0) < 0) - strerr_diefu1sys(111, "iopause") ; - - if (x[0].revents & IOPAUSE_EXCEPT) strerr_dief1x(111, "trouble with selfpipe") ; - if (x[0].revents & IOPAUSE_READ) handle_signals() ; - if (numconn < maxconn) - { - if (x[1].revents & IOPAUSE_EXCEPT) strerr_dief1x(111, "trouble with socket") ; - if (x[1].revents & IOPAUSE_READ) - { - char ip[16] ; - uint16 port ; - register int fd = socket_accept6(x[1].fd, ip, &port) ; - if (fd < 0) - { - if (verbosity) strerr_warnwu1sys("accept") ; - } - else - { - new_connection(fd, ip, port, argv+2, envp) ; - fd_close(fd) ; - } - } - } + newargv[m++] = "-C" ; + newargv[m++] = fmt + pos ; + pos += uint_fmt(fmt + pos, localmaxconn) ; + fmt[pos++] = 0 ; } + newargv[m++] = "--" ; + while (*argv) newargv[m++] = *argv++ ; + newargv[m++] = 0 ; + pathexec_run(newargv[0], newargv, envp) ; + strerr_dieexec(111, newargv[0]) ; } - if (verbosity >= 2) log_exit() ; - return 0 ; } |