X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=secnet.c;h=f9808b78b828baf036cd3359bb5246f84bbbe7b4;hp=0df6e0919c9befd5353acda7a12b133d61d86ee2;hb=076bb54e68477f883033bee696c9c5f801ece2f2;hpb=2fe58dfd10216a37f1ece081f926971882de112e diff --git a/secnet.c b/secnet.c index 0df6e09..f9808b7 100644 --- a/secnet.c +++ b/secnet.c @@ -1,49 +1,49 @@ -/* $Log: secnet.c,v $ - * Revision 1.1 1996/03/13 22:27:41 sde1000 - * Initial revision - * - */ - -static char *version="secnet version " VERSION " $Date: 1996/03/13 22:27:41 $"; - +#include "secnet.h" #include +#include +#include #include #include -#include #include +#include #include -#include -#include -#include #include -#include #include -#include -#include "secnet.h" #include "util.h" #include "conffile.h" -#include "modules.h" +#include "process.h" + +#if __APPLE__ +/* apple's poll() does not work on char devs */ +# define USE_SELECT 1 +#endif -/* Command-line options (possibly config-file options too) */ -static char *configfile="/etc/secnet/secnet.conf"; +/* XXX should be from autoconf */ +static const char *configfile="/etc/secnet/secnet.conf"; +static const char *sites_key="sites"; +bool_t just_check_config=False; static char *userid=NULL; static uid_t uid=0; -static bool_t background=True; +bool_t background=True; static char *pidfile=NULL; +bool_t require_root_privileges=False; +cstring_t require_root_privileges_explanation=NULL; + +static pid_t secnet_pid; /* Structures dealing with poll() call */ struct poll_interest { beforepoll_fn *before; afterpoll_fn *after; void *state; - uint32_t max_nfds; - uint32_t nfds; - string_t desc; + int32_t max_nfds; + int32_t nfds; + cstring_t desc; struct poll_interest *next; }; static struct poll_interest *reg=NULL; -static uint32_t total_nfds=10; +static int32_t total_nfds=10; static bool_t finished=False; @@ -62,12 +62,14 @@ static void parse_options(int argc, char **argv) {"nodetach", 0, 0, 'n'}, {"silent", 0, 0, 'f'}, {"quiet", 0, 0, 'f'}, - {"debug", 1, 0, 'd'}, + {"debug", 0, 0, 'd'}, {"config", 1, 0, 'c'}, + {"just-check-config", 0, 0, 'j'}, + {"sites-key", 1, 0, 's'}, {0,0,0,0} }; - c=getopt_long(argc, argv, "vwdnc:ft:", + c=getopt_long(argc, argv, "vwdnjc:ft:s:", long_options, &option_index); if (c==-1) break; @@ -75,42 +77,51 @@ static void parse_options(int argc, char **argv) switch(c) { case 2: /* Help */ - fprintf(stderr, - "Usage: secnet [OPTION]...\n\n" - " -f, --silent, --quiet suppress error messages\n" - " -w, --nowarnings suppress warnings\n" - " -v, --verbose output extra diagnostics\n" - " -c, --config=filename specify a configuration file\n" - " -n, --nodetach do not run in background\n" - " -d, --debug=item,... set debug options\n" - " --help display this help and exit\n" - " --version output version information and exit\n" + printf("Usage: secnet [OPTION]...\n\n" + " -f, --silent, --quiet suppress error messages\n" + " -w, --nowarnings suppress warnings\n" + " -v, --verbose output extra diagnostics\n" + " -c, --config=filename specify a configuration file\n" + " -j, --just-check-config stop after reading " + "configuration file\n" + " -s, --sites-key=name configuration key that " + "specifies active sites\n" + " -n, --nodetach do not run in background\n" + " -d, --debug output debug messages\n" + " --help display this help and exit\n" + " --version output version information " + "and exit\n" ); exit(0); break; case 1: /* Version */ - fprintf(stderr,"%s\n",version); + printf("%s\n",version); exit(0); break; case 'v': - message_level|=M_INFO|M_WARNING|M_ERROR|M_FATAL; + message_level|=M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY| + M_FATAL; break; - case 'n': - background=False; + case 'w': + message_level&=(~M_WARNING); break; case 'd': - message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE; + message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE|M_DEBUG; break; case 'f': message_level=M_FATAL; break; + case 'n': + background=False; + break; + case 'c': if (optarg) configfile=safe_strdup(optarg,"config_filename"); @@ -118,16 +129,28 @@ static void parse_options(int argc, char **argv) fatal("secnet: no config filename specified"); break; + case 'j': + just_check_config=True; + break; + + case 's': + if (optarg) + sites_key=safe_strdup(optarg,"sites-key"); + else + fatal("secnet: no sites key specified"); + break; + case '?': + exit(1); break; default: - Message(M_WARNING,"secnet: Unknown getopt code %c\n",c); + Message(M_ERR,"secnet: Unknown getopt code %c\n",c); } } if (argc-optind != 0) { - Message(M_WARNING,"secnet: You gave extra command line parameters, " + Message(M_ERR,"secnet: You gave extra command line parameters, " "which were ignored.\n"); } } @@ -137,7 +160,6 @@ static void setup(dict_t *config) list_t *l; item_t *site; dict_t *system; - struct log_if *log; struct passwd *pw; struct cloc loc; int i; @@ -145,7 +167,7 @@ static void setup(dict_t *config) l=dict_lookup(config,"system"); if (!l || list_elem(l,0)->type!=t_dict) { - fatal("configuration does not include a \"system\" dictionary\n"); + fatal("configuration does not include a \"system\" dictionary"); } system=list_elem(l,0)->data.dict; loc=list_elem(l,0)->loc; @@ -153,10 +175,9 @@ static void setup(dict_t *config) /* Arrange systemwide log facility */ l=dict_lookup(system,"log"); if (!l) { - fatal("configuration does not include a system/log facility\n"); + fatal("configuration does not include a system/log facility"); } - log=init_log(l); - log->log(log->st,LOG_DEBUG,"setup: logging started"); + system_log=init_log(l); /* Who are we supposed to run as? */ userid=dict_read_string(system,"userid",False,"system",loc); @@ -170,34 +191,43 @@ static void setup(dict_t *config) } while(pw); endpwent(); if (uid==0) { - fatal("userid \"%s\" not found\n",userid); + fatal("userid \"%s\" not found",userid); } } /* Pidfile name */ pidfile=dict_read_string(system,"pidfile",False,"system",loc); + /* Check whether we need root privileges */ + if (require_root_privileges && uid!=0) { + fatal("the configured feature \"%s\" requires " + "that secnet retain root privileges while running.", + require_root_privileges_explanation); + } + /* Go along site list, starting sites */ - l=dict_lookup(config,"sites"); + l=dict_lookup(config,sites_key); if (!l) { - fatal("configuration did not define any remote sites\n"); - } - i=0; - while ((site=list_elem(l, i++))) { - struct site_if *s; - if (site->type!=t_closure) { - cfgfatal(site->loc,"system","non-closure in site list"); - } - if (site->data.closure->type!=CL_SITE) { - cfgfatal(site->loc,"system","non-site closure in site list"); + Message(M_WARNING,"secnet: configuration key \"%s\" is missing; no " + "remote sites are defined\n",sites_key); + } else { + i=0; + while ((site=list_elem(l, i++))) { + struct site_if *s; + if (site->type!=t_closure) { + cfgfatal(site->loc,"system","non-closure in site list"); + } + if (site->data.closure->type!=CL_SITE) { + cfgfatal(site->loc,"system","non-site closure in site list"); + } + s=site->data.closure->interface; + s->control(s->st,True); } - s=site->data.closure->interface; - s->control(s->st,True); } } void register_for_poll(void *st, beforepoll_fn *before, - afterpoll_fn *after, uint32_t max_nfds, string_t desc) + afterpoll_fn *after, int32_t max_nfds, cstring_t desc) { struct poll_interest *i; @@ -208,6 +238,7 @@ void register_for_poll(void *st, beforepoll_fn *before, i->max_nfds=max_nfds; i->nfds=0; i->desc=desc; + assert(total_nfds < INT_MAX - max_nfds); total_nfds+=max_nfds; i->next=reg; reg=i; @@ -222,28 +253,70 @@ static void system_phase_hook(void *sst, uint32_t newphase) } } +#if USE_SELECT +static int fakepoll(struct pollfd *fds, int nfds, int timeout) { + fd_set infds[1], outfds[1]; + int maxfd = -1, i, rc; + struct timeval tvtimeout; + FD_ZERO(infds); + FD_ZERO(outfds); + for(i = 0; i < nfds; ++i) { + if(fds[i].events & POLLIN) + FD_SET(fds[i].fd, infds); + if(fds[i].events & POLLOUT) + FD_SET(fds[i].fd, outfds); + if(fds[i].fd > maxfd) + maxfd = fds[i].fd; + } + if(timeout != -1) { + tvtimeout.tv_sec = timeout / 1000; + tvtimeout.tv_usec = 1000 * (timeout % 1000); + } + rc = select(maxfd + 1, infds, outfds, NULL, + timeout == -1 ? NULL : &tvtimeout); + if(rc >= 0) { + for(i = 0; i < nfds; ++i) { + int revents = 0; + if(FD_ISSET(fds[i].fd, infds)) + revents |= POLLIN; + if(FD_ISSET(fds[i].fd, outfds)) + revents |= POLLOUT; + fds[i].revents = revents; + } + } + return rc; +} +#endif + +struct timeval tv_now_global; +uint64_t now_global; + static void run(void) { - struct timeval tv_now; - uint64_t now; struct poll_interest *i; int rv, nfds, remain, idx; int timeout; struct pollfd *fds; - fds=alloca(sizeof(*fds)*total_nfds); - if (!fds) { - fatal("run: couldn't alloca\n"); - } + fds=safe_malloc(sizeof(*fds)*total_nfds, "run"); - while (!finished) { - if (gettimeofday(&tv_now, NULL)!=0) { + Message(M_NOTICE,"%s [%d]: starting\n",version,secnet_pid); + + do { + if (gettimeofday(&tv_now_global, NULL)!=0) { fatal_perror("main loop: gettimeofday"); } - now=(tv_now.tv_sec*1000)+(tv_now.tv_usec/1000); + now_global=((uint64_t)tv_now_global.tv_sec*(uint64_t)1000)+ + ((uint64_t)tv_now_global.tv_usec/(uint64_t)1000); idx=0; for (i=reg; i; i=i->next) { - i->after(i->state, fds+idx, i->nfds, &tv_now, &now); + int check; + for (check=0; checknfds; check++) { + if(fds[idx+check].revents & POLLNVAL) { + fatal("run: poll (%s#%d) set POLLNVAL", i->desc, check); + } + } + i->after(i->state, fds+idx, i->nfds); idx+=i->nfds; } remain=total_nfds; @@ -251,52 +324,64 @@ static void run(void) timeout=-1; for (i=reg; i; i=i->next) { nfds=remain; - rv=i->before(i->state, fds+idx, &nfds, &timeout, &tv_now, &now); + rv=i->before(i->state, fds+idx, &nfds, &timeout); if (rv!=0) { /* XXX we need to handle this properly: increase the nfds available */ - fatal("run: beforepoll_fn (%s) returns %d\n",i->desc,rv); + fatal("run: beforepoll_fn (%s) returns %d",i->desc,rv); } if (timeout<-1) { - fatal("run: beforepoll_fn (%s) set timeout to %d\n",timeout); + fatal("run: beforepoll_fn (%s) set timeout to %d",timeout); } idx+=nfds; remain-=nfds; i->nfds=nfds; } do { + if (finished) break; +#if USE_SELECT + rv=fakepoll(fds, idx, timeout); +#else rv=poll(fds, idx, timeout); +#endif if (rv<0) { if (errno!=EINTR) { fatal_perror("run: poll"); } } } while (rv<0); - } + } while (!finished); + free(fds); } static void droppriv(void) { FILE *pf=NULL; pid_t p; + int errfds[2]; add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL); - /* Background now, if we're supposed to: we may be unable to write the - pidfile if we don't. */ - if (background) { - printf("goto background\n"); - /* Open the pidfile before forking - that way the parent can tell - whether it succeeds */ - if (pidfile) { - pf=fopen(pidfile,"w"); - if (!pf) { - fatal_perror("cannot open pidfile \"%s\"",pidfile); - } - } else { - Message(M_WARNING,"secnet: no pidfile configured, but " - "backgrounding anyway\n"); + /* Open the pidfile for writing now: we may be unable to do so + once we drop privileges. */ + if (pidfile) { + pf=fopen(pidfile,"w"); + if (!pf) { + fatal_perror("cannot open pidfile \"%s\"",pidfile); } + } + if (!background && pf) { + fprintf(pf,"%d\n",getpid()); + fclose(pf); + } + + /* Now drop privileges */ + if (uid!=0) { + if (setuid(uid)!=0) { + fatal_perror("can't set uid to \"%s\"",userid); + } + } + if (background) { p=fork(); if (p>0) { if (pf) { @@ -308,29 +393,39 @@ static void droppriv(void) } else if (p==0) { /* Child process - all done, just carry on */ if (pf) fclose(pf); - printf("child\n"); + /* Close stdin and stdout; we don't need them any more. + stderr is redirected to the system/log facility */ + if (pipe(errfds)!=0) { + fatal_perror("can't create pipe for stderr"); + } + close(0); + close(1); + close(2); + dup2(errfds[1],0); + dup2(errfds[1],1); + dup2(errfds[1],2); + secnet_is_daemon=True; + setsid(); + log_from_fd(errfds[0],"stderr",system_log); } else { /* Error */ fatal_perror("cannot fork"); exit(1); } - } else { - if (pidfile) { - pf=fopen(pidfile,"w"); - if (!pf) { - fatal_perror("cannot open pidfile \"%s\"",pidfile); - } - fprintf(pf,"%d\n",getpid()); - fclose(pf); - } } + secnet_pid=getpid(); +} - /* Drop privilege now, if configured to do so */ - if (uid!=0) { - if (setuid(uid)!=0) { - fatal_perror("can't set uid to \"%s\"",userid); - } - } +static signal_notify_fn finish,ignore_hup; +static void finish(void *st, int signum) +{ + finished=True; + Message(M_NOTICE,"%s [%d]: received %s\n",version,secnet_pid,(string_t)st); +} +static void ignore_hup(void *st, int signum) +{ + Message(M_INFO,"%s [%d]: received SIGHUP\n",version,secnet_pid); + return; } int main(int argc, char **argv) @@ -345,15 +440,28 @@ int main(int argc, char **argv) enter_phase(PHASE_SETUP); setup(config); + + if (just_check_config) { + Message(M_INFO,"configuration file check complete\n"); + exit(0); + } + + enter_phase(PHASE_GETRESOURCES); + /* Appropriate phase hooks will have been run */ enter_phase(PHASE_DROPPRIV); droppriv(); + start_signal_handling(); + request_signal_notification(SIGTERM,finish,safe_strdup("SIGTERM","run")); + if (!background) request_signal_notification(SIGINT,finish, + safe_strdup("SIGINT","run")); + request_signal_notification(SIGHUP,ignore_hup,NULL); enter_phase(PHASE_RUN); run(); enter_phase(PHASE_SHUTDOWN); + Message(M_NOTICE,"%s [%d]: finished\n",version,secnet_pid); return 0; } -