X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fsys-osf.c;h=3578f67f861b3289d6326924910ba90e0bf77d70;hp=cb3c7fd824e84af050e9a51ca9fdfcb871e047f0;hb=88890fc13f9b346db647c882b376926686177112;hpb=609bb900cf3ecb53ef6a06bb7dbac35d2a1dd3ea diff --git a/pppd/sys-osf.c b/pppd/sys-osf.c index cb3c7fd..3578f67 100644 --- a/pppd/sys-osf.c +++ b/pppd/sys-osf.c @@ -19,7 +19,7 @@ */ #ifndef lint -static char rcsid[] = "$Id: sys-osf.c,v 1.1 1995/04/24 06:16:23 paulus Exp $"; +static char rcsid[] = "$Id: sys-osf.c,v 1.9 1996/05/26 23:58:46 paulus Exp $"; #endif /* @@ -67,10 +67,22 @@ static int closed_stdio; static int restore_term; /* 1 => we've munged the terminal */ static struct termios inittermios; /* Initial TTY termios */ static struct winsize wsinfo; /* Initial window size info */ +static int initfdflags = -1; /* Initial file descriptor flags for fd */ -int sockfd; /* socket for doing interface ioctls */ +static int sockfd; /* socket for doing interface ioctls */ + +int orig_ttyfd = -1; /* Original ttyfd if we did a streamify() */ + +static int if_is_up; /* Interface has been marked up */ +static u_int32_t ifaddrs[2]; /* Local and remote addrs we've set */ +static u_int32_t default_route_gateway; /* Gateway for default route added */ +static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */ + +/* Prototypes for procedures local to this file. */ +static int translate_speed __P((int)); +static int baud_rate_of __P((int)); +static int get_ether_addr __P((u_int32_t, struct sockaddr *)); -int ttyfd = -1; /* Original ttyfd if we did a streamify() */ /* * sys_init - System-dependent initialization. @@ -78,11 +90,6 @@ int ttyfd = -1; /* Original ttyfd if we did a streamify() */ void sys_init() { - openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); - setlogmask(LOG_UPTO(LOG_INFO)); - if (debug) - setlogmask(LOG_UPTO(LOG_DEBUG)); - /* Get an internet socket for doing socket ioctl's on. */ if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "Couldn't create IP socket: %m"); @@ -91,17 +98,29 @@ sys_init() } /* - * note_debug_level - note a change in the debug level. + * sys_cleanup - restore any system state we modified before exiting: + * mark the interface down, delete default route and/or proxy arp entry. + * This should call die() because it's called from die(). */ void -note_debug_level() +sys_cleanup() { - if (debug) { - syslog(LOG_INFO, "Debug turned ON, Level %d", debug); - setlogmask(LOG_UPTO(LOG_DEBUG)); - } else { - setlogmask(LOG_UPTO(LOG_WARNING)); + struct ifreq ifr; + + if (if_is_up) { + strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0 + && ((ifr.ifr_flags & IFF_UP) != 0)) { + ifr.ifr_flags &= ~IFF_UP; + ioctl(sockfd, SIOCSIFFLAGS, &ifr); + } } + if (ifaddrs[0]) + cifaddr(0, ifaddrs[0], ifaddrs[1]); + if (default_route_gateway) + cifdefaultroute(0, default_route_gateway); + if (proxy_arp_addr) + cifproxyarp(0, proxy_arp_addr); } /* @@ -230,7 +249,7 @@ streamify(int fd) } } else { close(fdes[1]); - ttyfd = fd; + orig_ttyfd = fd; return(fdes[0]); } } @@ -243,12 +262,13 @@ streamify(int fd) * establish_ppp - Turn the serial port into a ppp interface. */ void -establish_ppp() +establish_ppp(fd) + int fd; { int ret; if (isastream(fd) != 1) { - if ((fd=streamify(fd)) < 0) { + if ((ttyfd = fd = streamify(fd)) < 0) { syslog(LOG_ERR, "Couldn't get a STREAMS module!\n"); die(1); } @@ -308,6 +328,14 @@ establish_ppp() close(i); closed_stdio = 1; } + + /* + * Set device for non-blocking reads. + */ + if ((initfdflags = fcntl(fd, F_GETFL)) == -1 + || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) { + syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m"); + } } /* Debugging routine.... */ @@ -338,11 +366,17 @@ void prstrstack(int fd) * modules. This shouldn't call die() because it's called from die(). */ void -disestablish_ppp() +disestablish_ppp(fd) + int fd; { int flags; char *s; + /* Reset non-blocking mode on the file descriptor. */ + if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0) + syslog(LOG_WARNING, "Couldn't restore device fd flags: %m"); + initfdflags = -1; + if (hungup) { /* we can't push or pop modules after the stream has hung up */ str_module_count = 0; @@ -350,11 +384,42 @@ disestablish_ppp() return; } + if (pushed_ppp) { + while (ioctl(fd, I_POP, 0) == 0) /* pop any we pushed */ + ; + pushed_ppp = 0; + + for (; str_module_count > 0; str_module_count--) { + if (ioctl(fd, I_PUSH, str_modules[str_module_count-1].modname)) { + if (errno != ENXIO) + syslog(LOG_WARNING, "str_restore: couldn't push module %s: %m", + str_modules[str_module_count-1].modname); + } else { + MAINDEBUG((LOG_INFO, "str_restore: pushed module %s", + str_modules[str_module_count-1].modname)); + } + } + + if (orig_ttyfd >= 0) { + close(fd); + ttyfd = orig_ttyfd; + fd = -1; + } + } + +} + +/* + * clean_check - check whether the link seems to be 8-bit clean. + */ +void +clean_check() +{ if (pushed_ppp) { /* * Check whether the link seems not to be 8-bit clean. */ - if (ioctl(fd, (int)SIOCGIFDEBUG, (caddr_t) &flags) == 0) { + if (ioctl(ttyfd, (int)SIOCGIFDEBUG, (caddr_t) &flags) == 0) { s = NULL; switch (~flags & PAI_FLAGS_HIBITS) { case PAI_FLAGS_B7_0: @@ -375,32 +440,9 @@ disestablish_ppp() syslog(LOG_WARNING, "All received characters had %s", s); } } - - while (ioctl(fd, I_POP, 0) == 0) /* pop any we pushed */ - ; - pushed_ppp = 0; - - for (; str_module_count > 0; str_module_count--) { - if (ioctl(fd, I_PUSH, str_modules[str_module_count-1].modname)) { - if (errno != ENXIO) - syslog(LOG_WARNING, "str_restore: couldn't push module %s: %m", - str_modules[str_module_count-1].modname); - } else { - MAINDEBUG((LOG_INFO, "str_restore: pushed module %s", - str_modules[str_module_count-1].modname)); - } - } - - if (ttyfd >= 0) { - close(fd); - fd = ttyfd; - ttyfd = -1; - } } - } - /* * List of valid speeds. */ @@ -479,7 +521,7 @@ struct speed { /* * Translate from bits/second to a speed_t. */ -int +static int translate_speed(bps) int bps; { @@ -497,7 +539,7 @@ translate_speed(bps) /* * Translate from a speed_t to bits/second. */ -int +static int baud_rate_of(speed) int speed; { @@ -548,8 +590,8 @@ set_up_tty(fd, local) tios.c_cc[VMIN] = 1; tios.c_cc[VTIME] = 0; - if (crtscts == 2) { - tios.c_iflag |= IXOFF; + if (crtscts == -2) { + tios.c_iflag |= IXON | IXOFF; tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ } @@ -584,9 +626,19 @@ set_up_tty(fd, local) * restore_tty - restore the terminal to the saved settings. */ void -restore_tty() +restore_tty(fd) + int fd; { if (restore_term) { + if (!default_device) { + /* + * Turn off echoing, because otherwise we can get into + * a loop with the tty and the modem echoing to each other. + * We presume we are the sole user of this tty device, so + * when we close it, it will revert to its defaults anyway. + */ + inittermios.c_lflag &= ~(ECHO | ECHONL); + } if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0) if (errno != ENXIO) syslog(LOG_WARNING, "tcsetattr: %m"); @@ -618,20 +670,25 @@ output(unit, p, len) u_char *p; int len; { - struct strbuf str; + struct strbuf str; + int retries; + struct pollfd pfd; - if (unit != 0) - MAINDEBUG((LOG_WARNING, "output: unit != 0!")); if (debug) log_packet(p, len, "sent "); str.len = len; str.buf = (caddr_t) p; - if (putmsg(fd, NULL, &str, 0) < 0) { - if (errno != ENXIO) { - syslog(LOG_ERR, "putmsg: %m"); - die(1); + retries = 4; + while (putmsg(ttyfd, NULL, &str, 0) < 0) { + if (--retries < 0 || (errno != EWOULDBLOCK && errno != EAGAIN)) { + if (errno != ENXIO) + syslog(LOG_ERR, "Couldn't send packet: %m"); + break; } + pfd.fd = ttyfd; + pfd.events = POLLOUT; + poll(&pfd, 1, 250); /* wait for up to 0.25 seconds */ } } @@ -646,7 +703,7 @@ wait_input(timo) struct pollfd pfd; t = timo == NULL? -1: timo->tv_sec * 1000 + timo->tv_usec / 1000; - pfd.fd = fd; + pfd.fd = ttyfd; pfd.events = POLLIN | POLLPRI | POLLHUP; if (poll(&pfd, 1, t) < 0 && errno != EINTR) { syslog(LOG_ERR, "poll: %m"); @@ -670,12 +727,12 @@ read_packet(buf) ctl.maxlen = sizeof(ctlbuf); ctl.buf = (caddr_t) ctlbuf; i = 0; - len = getmsg(fd, &ctl, &str, &i); + len = getmsg(ttyfd, &ctl, &str, &i); if (len < 0) { if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) { return -1; } - syslog(LOG_ERR, "getmsg(fd) %m"); + syslog(LOG_ERR, "getmsg %m"); die(1); } if (len) @@ -713,19 +770,19 @@ ppp_send_config(unit, mtu, asyncmap, pcomp, accomp) quit(); } - if(ioctl(fd, (int)SIOCSIFASYNCMAP, (caddr_t) &asyncmap) < 0) { + if(ioctl(ttyfd, (int)SIOCSIFASYNCMAP, (caddr_t) &asyncmap) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFASYNCMAP): %m"); quit(); } c = (pcomp? 1: 0); - if(ioctl(fd, (int)SIOCSIFCOMPPROT, &c) < 0) { + if(ioctl(ttyfd, (int)SIOCSIFCOMPPROT, &c) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m"); quit(); } c = (accomp? 1: 0); - if(ioctl(fd, (int)SIOCSIFCOMPAC, &c) < 0) { + if(ioctl(ttyfd, (int)SIOCSIFCOMPAC, &c) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m"); quit(); } @@ -740,7 +797,7 @@ ppp_set_xaccm(unit, accm) int unit; ext_accm accm; { - if (ioctl(fd, (int)SIOCSIFXASYNCMAP, accm) < 0 && errno != ENOTTY) + if (ioctl(ttyfd, (int)SIOCSIFXASYNCMAP, accm) < 0 && errno != ENOTTY) syslog(LOG_WARNING, "ioctl(set extended ACCM): %m"); } @@ -757,21 +814,21 @@ ppp_recv_config(unit, mru, asyncmap, pcomp, accomp) { char c; - if (ioctl(fd, (int)SIOCSIFMRU, &mru) < 0) { + if (ioctl(ttyfd, (int)SIOCSIFMRU, &mru) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFMRU): %m"); } - if (ioctl(fd, (int)SIOCSIFRASYNCMAP, (caddr_t) &asyncmap) < 0) { + if (ioctl(ttyfd, (int)SIOCSIFRASYNCMAP, (caddr_t) &asyncmap) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFRASYNCMAP): %m"); } c = 2 + (pcomp? 1: 0); - if(ioctl(fd, (int)SIOCSIFCOMPPROT, &c) < 0) { + if(ioctl(ttyfd, (int)SIOCSIFCOMPPROT, &c) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m"); } c = 2 + (accomp? 1: 0); - if (ioctl(fd, (int)SIOCSIFCOMPAC, &c) < 0) { + if (ioctl(ttyfd, (int)SIOCSIFCOMPAC, &c) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m"); } } @@ -792,7 +849,9 @@ ccp_test(unit, opt_ptr, opt_len, for_transmit) data.length = opt_len; data.transmit = for_transmit; BCOPY(opt_ptr, data.opt_data, opt_len); - return ioctl(fd, (int)SIOCSCOMPRESS, (caddr_t) &data) >= 0; + if (ioctl(ttyfd, (int)SIOCSCOMPRESS, (caddr_t) &data) >= 0) + return 1; + return (errno == ENOSR)? 0: -1; } /* @@ -805,7 +864,7 @@ ccp_flags_set(unit, isopen, isup) int x; x = (isopen? 1: 0) + (isup? 2: 0); - if (ioctl(fd, (int)SIOCSIFCOMP, (caddr_t) &x) < 0 && errno != ENOTTY) + if (ioctl(ttyfd, (int)SIOCSIFCOMP, (caddr_t) &x) < 0 && errno != ENOTTY) syslog(LOG_ERR, "ioctl (SIOCSIFCOMP): %m"); } @@ -820,7 +879,7 @@ ccp_fatal_error(unit) { int x; - if (ioctl(fd, (int)SIOCGIFCOMP, (caddr_t) &x) < 0) { + if (ioctl(ttyfd, (int)SIOCGIFCOMP, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(SIOCGIFCOMP): %m"); return 0; } @@ -837,7 +896,7 @@ sifvjcomp(u, vjcomp, cidcomp, maxcid) char x; x = (vjcomp? 1: 0) + (cidcomp? 0: 2) + (maxcid << 4); - if (ioctl(fd, (int)SIOCSIFVJCOMP, (caddr_t) &x) < 0) { + if (ioctl(ttyfd, (int)SIOCSIFVJCOMP, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFVJCOMP): %m"); return 0; } @@ -852,7 +911,6 @@ sifup(u) int u; { struct ifreq ifr; - struct npioctl npi; strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); if (ioctl(sockfd, (int)SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { @@ -864,14 +922,7 @@ sifup(u) syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); return 0; } - npi.protocol = PPP_IP; - npi.mode = NPMODE_PASS; - if (ioctl(fd, (int)SIOCSETNPMODE, &npi) < 0) { - if (errno != ENOTTY) { - syslog(LOG_ERR, "ioctl(SIOCSETNPMODE): %m"); - return 0; - } - } + if_is_up = 1; return 1; } @@ -889,12 +940,7 @@ sifdown(u) rv = 1; npi.protocol = PPP_IP; npi.mode = NPMODE_ERROR; - if (ioctl(fd, (int)SIOCSETNPMODE, (caddr_t) &npi) < 0) { - if (errno != ENOTTY) { - syslog(LOG_ERR, "ioctl(SIOCSETNPMODE): %m"); - rv = 0; - } - } + ioctl(ttyfd, (int)SIOCSETNPMODE, (caddr_t) &npi); /* ignore errors */ strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); if (ioctl(sockfd, (int)SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { @@ -905,7 +951,8 @@ sifdown(u) if (ioctl(sockfd, (int)SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); rv = 0; - } + } else + if_is_up = 0; } return rv; } @@ -915,7 +962,8 @@ sifdown(u) */ #define SET_SA_FAMILY(addr, family) \ BZERO((char *) &(addr), sizeof(addr)); \ - addr.sa_family = (family); + addr.sa_family = (family); \ + addr.sa_len = sizeof ((addr)) /* * sifaddr - Config the interface IP addresses and netmask. @@ -925,40 +973,47 @@ sifaddr(u, o, h, m) int u; u_int32_t o, h, m; { - int ret; struct ifreq ifr; + struct ifaliasreq addreq; + int ret; ret = 1; + + /* flush old address, if any + */ + bzero(&ifr, sizeof (ifr)); strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); SET_SA_FAMILY(ifr.ifr_addr, AF_INET); ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o; - if (ioctl(sockfd, (int)SIOCSIFADDR, (caddr_t) &ifr) < 0) { - syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m"); - ret = 0; - } - ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h; - if (ioctl(sockfd, (int)SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) { - syslog(LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m"); + if ((ioctl(sockfd, (int)SIOCDIFADDR, (caddr_t) &ifr) < 0) + && errno != EADDRNOTAVAIL) { + syslog(LOG_ERR, "ioctl(SIOCDIFADDR): %m"); ret = 0; } + + bzero(&addreq, sizeof (addreq)); + strncpy(addreq.ifra_name, ifname, sizeof (addreq.ifra_name)); + SET_SA_FAMILY(addreq.ifra_addr, AF_INET); + SET_SA_FAMILY(addreq.ifra_broadaddr, AF_INET); + ((struct sockaddr_in *)&addreq.ifra_addr)->sin_addr.s_addr = o; + ((struct sockaddr_in *)&addreq.ifra_broadaddr)->sin_addr.s_addr = h; + if (m != 0) { - ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m; + ((struct sockaddr_in *)&addreq.ifra_mask)->sin_addr.s_addr = m; + addreq.ifra_mask.sa_len = sizeof (struct sockaddr); syslog(LOG_INFO, "Setting interface mask to %s\n", ip_ntoa(m)); - if (ioctl(sockfd, (int)SIOCSIFNETMASK, (caddr_t) &ifr) < 0) { - syslog(LOG_ERR, "ioctl(SIOCSIFNETMASK): %m"); - ret = 0; - } } - -/* Reset if address --- This is stupid, but seems to be necessary... */ - - ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o; - if (ioctl(sockfd, (int)SIOCSIFADDR, (caddr_t) &ifr) < 0) { - syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m"); - ret = 0; + + /* install new src/dst and (possibly) netmask + */ + if (ioctl(sockfd, SIOCPIFADDR, &addreq) < 0) { + syslog(LOG_ERR, "ioctl(SIOCPIFADDR): %m"); + ret = 0; } - - return ret; + + ifaddrs[0] = o; + ifaddrs[1] = h; + return (ret); } /* @@ -970,15 +1025,15 @@ cifaddr(u, o, h) int u; u_int32_t o, h; { - struct ortentry rt; + struct ifreq ifr; - SET_SA_FAMILY(rt.rt_dst, AF_INET); - ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = h; - SET_SA_FAMILY(rt.rt_gateway, AF_INET); - ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = o; - rt.rt_flags = RTF_HOST; - if (ioctl(sockfd, (int)SIOCDELRT, (caddr_t) &rt) < 0) { - syslog(LOG_ERR, "ioctl(SIOCDELRT): %m"); + ifaddrs[0] = 0; + bzero(&ifr, sizeof (ifr)); + strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); + SET_SA_FAMILY(ifr.ifr_addr, AF_INET); + ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o; + if (ioctl(sockfd, (int)SIOCDIFADDR, (caddr_t) &ifr) < 0) { + syslog(LOG_ERR, "ioctl(SIOCDIFADDR): %m"); return 0; } return 1; @@ -994,6 +1049,7 @@ sifdefaultroute(u, g) { struct ortentry rt; + BZERO(&rt, sizeof(rt)); SET_SA_FAMILY(rt.rt_dst, AF_INET); SET_SA_FAMILY(rt.rt_gateway, AF_INET); ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g; @@ -1002,6 +1058,7 @@ sifdefaultroute(u, g) syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %m"); return 0; } + default_route_gateway = g; return 1; } @@ -1015,6 +1072,7 @@ cifdefaultroute(u, g) { struct ortentry rt; + BZERO(&rt, sizeof(rt)); SET_SA_FAMILY(rt.rt_dst, AF_INET); SET_SA_FAMILY(rt.rt_gateway, AF_INET); ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g; @@ -1023,6 +1081,7 @@ cifdefaultroute(u, g) syslog(LOG_ERR, "default route ioctl(SIOCDELRT): %m"); return 0; } + default_route_gateway = 0; return 1; } @@ -1055,6 +1114,7 @@ sifproxyarp(unit, hisaddr) return 0; } + proxy_arp_addr = hisaddr; return 1; } @@ -1075,6 +1135,7 @@ cifproxyarp(unit, hisaddr) syslog(LOG_ERR, "ioctl(SIOCDARP): %m"); return 0; } + proxy_arp_addr = 0; return 1; } @@ -1086,7 +1147,7 @@ cifproxyarp(unit, hisaddr) int s; -int +static int get_ether_addr(ipaddr, hwaddr) u_int ipaddr; struct sockaddr *hwaddr; @@ -1111,7 +1172,8 @@ get_ether_addr(ipaddr, hwaddr) * address on the same subnet as `ipaddr'. */ ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); - for (ifr = ifc.ifc_req; ifr < ifend; ) { + for (ifr = ifc.ifc_req; ifr < ifend; +ifr = (struct ifreq *) + ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len) { if (ifr->ifr_addr.sa_family == AF_INET) { ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); @@ -1136,7 +1198,6 @@ get_ether_addr(ipaddr, hwaddr) break; } - ifr++; } if (ifr >= ifend) @@ -1156,6 +1217,71 @@ get_ether_addr(ipaddr, hwaddr) } +/* + * Return user specified netmask, modified by any mask we might determine + * for address `addr' (in network byte order). + * Here we scan through the system's list of interfaces, looking for + * any non-point-to-point interfaces which might appear to be on the same + * network as `addr'. If we find any, we OR in their netmask to the + * user-specified netmask. + */ +u_int32_t +GetMask(addr) + u_int32_t addr; +{ + u_int32_t mask, nmask, ina; + struct ifreq *ifr, *ifend, ifreq; + struct ifconf ifc; + struct ifreq ifs[MAX_IFS]; + + addr = ntohl(addr); + if (IN_CLASSA(addr)) /* determine network mask for address class */ + nmask = IN_CLASSA_NET; + else if (IN_CLASSB(addr)) + nmask = IN_CLASSB_NET; + else + nmask = IN_CLASSC_NET; + /* class D nets are disallowed by bad_ip_adrs */ + mask = netmask | htonl(nmask); + + /* + * Scan through the system's network interfaces. + */ + ifc.ifc_len = sizeof(ifs); + ifc.ifc_req = ifs; + if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { + syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m"); + return mask; + } + ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); + for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) { + /* + * Check the interface's internet address. + */ + if (ifr->ifr_addr.sa_family != AF_INET) + continue; + ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; + if ((ntohl(ina) & nmask) != (addr & nmask)) + continue; + /* + * Check that the interface is up, and not point-to-point or loopback. + */ + strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); + if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) + continue; + if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK)) + != IFF_UP) + continue; + /* + * Get its netmask and OR it into our mask. + */ + if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) + continue; + mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr; + } + + return mask; +} #define WTMPFILE "/usr/adm/wtmp"