X-Git-Url: https://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fsys-linux.c;h=e08652de57a413f14cb4124b55426b8cf8a2bc40;hp=1c4b8f31c115f2041c6654b0849e2883afabfd09;hb=8e7baa80216d5b1c1a1a1386a4a64f9443d449ca;hpb=5da8d0e22703b3512673e057fffe670ca9f958df diff --git a/pppd/sys-linux.c b/pppd/sys-linux.c index 1c4b8f3..e08652d 100644 --- a/pppd/sys-linux.c +++ b/pppd/sys-linux.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include @@ -52,6 +53,7 @@ #include "ipcp.h" static int initdisc = -1; /* Initial TTY discipline */ +static int initfdflags = -1; /* Initial file descriptor flags for fd */ static int prev_kdebugflag = 0; static int has_default_route = 0; static int has_proxy_arp = 0; @@ -61,16 +63,35 @@ static int driver_patch = 0; static int restore_term = 0; /* 1 => we've munged the terminal */ static struct termios inittermios; /* Initial TTY termios */ -int sockfd; /* socket for doing interface ioctls */ +static int sockfd; /* socket for doing interface ioctls */ + +static int if_is_up; /* Interface has been marked up */ +static u_int32_t ipaddrs[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 */ static char *lock_file; -#define MAX_IFS 32 +#define MAX_IFS 100 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST) #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \ IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP) +/* Prototypes for procedures local to this file. */ +static int get_flags (void); +static void set_flags (int flags); +static int translate_speed (int bps); +static int baud_rate_of (int speed); +static char *path_to_route (void); +static void close_route_table (void); +static int open_route_table (void); +static int read_route_table (struct rtentry *rt); +static int defaultroute_exists (void); +static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr); +static void decode_version (char *buf, int *version, int *mod, int *patch); + + /* * SET_SA_FAMILY - set the sa_family field of a struct sockaddr, * if it exists. @@ -95,7 +116,7 @@ static int get_flags (void) { int flags; - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) + if (ioctl(ttyfd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m"); quit(); @@ -109,7 +130,7 @@ static void set_flags (int flags) { MAINDEBUG ((LOG_DEBUG, "set flags = %x\n", flags)); - if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) + if (ioctl(ttyfd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m", flags); quit(); @@ -138,6 +159,26 @@ void sys_init(void) } } +/* + * 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 sys_cleanup() +{ + struct ifreq ifr; + + if (if_is_up) + sifdown(0); + if (ipaddrs[0]) + cifaddr(0, ipaddrs[0], ipaddrs[1]); + /* XXX maybe we need to delete the route through the interface */ + if (has_default_route) + cifdefaultroute(0, default_route_gateway); + if (has_proxy_arp) + cifproxyarp(0, proxy_arp_addr); +} + /* * note_debug_level - note a change in the debug level. */ @@ -161,7 +202,7 @@ void note_debug_level (void) int set_kdebugflag (int requested_level) { - if (ioctl(fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) + if (ioctl(ttyfd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m"); return (0); @@ -169,12 +210,13 @@ int set_kdebugflag (int requested_level) if (prev_kdebugflag != requested_level) { - if (ioctl(fd, PPPIOCSDEBUG, &requested_level) < 0) + if (ioctl(ttyfd, PPPIOCSDEBUG, &requested_level) < 0) { syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m"); return (0); } - MAINDEBUG ((LOG_INFO, "set kernel debugging level to %d", requested_level)); + MAINDEBUG ((LOG_INFO, "set kernel debugging level to %d", + requested_level)); } return (1); } @@ -183,7 +225,7 @@ int set_kdebugflag (int requested_level) * establish_ppp - Turn the serial port into a ppp interface. */ -void establish_ppp (void) +void establish_ppp (int fd) { int pppdisc = N_PPP; int sig = SIGIO; @@ -218,6 +260,15 @@ void establish_ppp (void) MAINDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver", driver_version, driver_modification, driver_patch)); + + /* + * 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"); + } } /* @@ -225,78 +276,83 @@ void establish_ppp (void) * This shouldn't call die() because it's called from die(). */ -void disestablish_ppp(void) +void disestablish_ppp(int fd) { int x; char *s; -/* - * If this is no longer PPP mode then there is nothing that can be done - * about restoring the previous mode. - */ - if (!still_ppp()) + + /* 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 (still_ppp() && initdisc >= 0) { - initdisc = -1; - return; + set_kdebugflag (prev_kdebugflag); + + if (ioctl(fd, TIOCSETD, &initdisc) < 0) + { + syslog(LOG_WARNING, "ioctl(TIOCSETD): %m"); + } + + if (ioctl(fd, TIOCNXCL, 0) < 0) + { + syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m"); + } } + initdisc = -1; + } + /* - * Check whether the link seems not to be 8-bit clean. + * clean_check - Fetch the flags for the device and generate + * appropriate error messages. */ - if (initdisc >= 0) +void clean_check(void) + { + if (still_ppp() && initdisc >= 0) { - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) + if (ioctl(ttyfd, PPPIOCGFLAGS, (caddr_t) &x) == 0) { s = NULL; switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) { - case SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP: + case SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP: s = "nothing was received"; break; - - case SC_RCV_B7_0: - case SC_RCV_B7_0 | SC_RCV_EVNP: - case SC_RCV_B7_0 | SC_RCV_ODDP: - case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP: + + case SC_RCV_B7_0: + case SC_RCV_B7_0 | SC_RCV_EVNP: + case SC_RCV_B7_0 | SC_RCV_ODDP: + case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP: s = "all had bit 7 set to 1"; break; - - case SC_RCV_B7_1: - case SC_RCV_B7_1 | SC_RCV_EVNP: - case SC_RCV_B7_1 | SC_RCV_ODDP: - case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP: + + case SC_RCV_B7_1: + case SC_RCV_B7_1 | SC_RCV_EVNP: + case SC_RCV_B7_1 | SC_RCV_ODDP: + case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP: s = "all had bit 7 set to 0"; break; - - case SC_RCV_EVNP: + + case SC_RCV_EVNP: s = "all had odd parity"; break; - - case SC_RCV_ODDP: + + case SC_RCV_ODDP: s = "all had even parity"; break; } - + if (s != NULL) { - syslog(LOG_WARNING, "Receive serial link is not 8-bit clean:"); + syslog(LOG_WARNING, "Receive serial link is not" + " 8-bit clean:"); syslog(LOG_WARNING, "Problem: %s", s); } } - - set_kdebugflag (prev_kdebugflag); - - if (ioctl(fd, TIOCSETD, &initdisc) < 0) - { - syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); - } - - if (ioctl(fd, TIOCNXCL, 0) < 0) - { - syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m"); - } - - initdisc = -1; } } + /* * List of valid speeds. @@ -378,7 +434,7 @@ struct speed { * Translate from bits/second to a speed_t. */ -int translate_speed (int bps) +static int translate_speed (int bps) { struct speed *speedp; @@ -400,7 +456,7 @@ int translate_speed (int bps) * Translate from a speed_t to bits/second. */ -int baud_rate_of (int speed) +static int baud_rate_of (int speed) { struct speed *speedp; @@ -459,8 +515,8 @@ void set_up_tty (int fd, int local) tios.c_cflag |= CRTSCTS; break; - case 2: - tios.c_iflag |= IXOFF; + case -2: + tios.c_iflag |= IXON | IXOFF; tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ break; @@ -520,7 +576,7 @@ void setdtr (int fd, int on) * restore_tty - restore the terminal to the saved settings. */ -void restore_tty (void) +void restore_tty (int fd) { if (restore_term) { @@ -552,25 +608,28 @@ void restore_tty (void) void output (int unit, unsigned char *p, int len) { - if (unit != 0) - { - MAINDEBUG((LOG_WARNING, "output: unit != 0!")); - } - if (debug) { log_packet(p, len, "sent "); } - if (write(fd, p, len) < 0) + if (write(ttyfd, p, len) < 0) { - syslog(LOG_ERR, "write: %m"); - die(1); + if (errno == EWOULDBLOCK || errno == ENOBUFS + || errno == ENXIO || errno == EIO) + { + syslog(LOG_WARNING, "write: warning: %m"); + } + else + { + syslog(LOG_ERR, "write: %m"); + die(1); + } } } /* - * wait_input - wait until there is data available on fd, + * wait_input - wait until there is data available on ttyfd, * for the length of time specified by *timo (indefinite * if timo is NULL). */ @@ -581,9 +640,9 @@ void wait_input (struct timeval *timo) int n; FD_ZERO(&ready); - FD_SET(fd, &ready); + FD_SET(ttyfd, &ready); - n = select(fd+1, &ready, NULL, &ready, timo); + n = select(ttyfd+1, &ready, NULL, &ready, timo); if (n < 0 && errno != EINTR) { syslog(LOG_ERR, "select: %m"); @@ -599,14 +658,14 @@ int read_packet (unsigned char *buf) { int len; - len = read(fd, buf, PPP_MTU + PPP_HDRLEN); + len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN); if (len < 0) { if (errno == EWOULDBLOCK) { return -1; } - syslog(LOG_ERR, "read(fd): %m"); + syslog(LOG_ERR, "read: %m"); die(1); } return len; @@ -624,37 +683,35 @@ void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp) MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu)); /* - * If we were called because the link has gone down then there is nothing - * which may be done. Just return without incident. + * Ensure that the link is still up. */ - if (!still_ppp()) + if (still_ppp()) { - return; - } /* * Set the MTU and other parameters for the ppp device */ - memset (&ifr, '\0', sizeof (ifr)); - strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); - ifr.ifr_mtu = mtu; - - if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) - { - syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m"); - quit(); - } + memset (&ifr, '\0', sizeof (ifr)); + strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); + ifr.ifr_mtu = mtu; + + if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) + { + syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m"); + quit(); + } + + MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap)); + if (ioctl(ttyfd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) + { + syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m"); + quit(); + } - MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap)); - if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) - { - syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m"); - quit(); + x = get_flags(); + x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT; + x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC; + set_flags(x); } - - x = get_flags(); - x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT; - x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC; - set_flags(x); } /* @@ -666,7 +723,7 @@ void ppp_set_xaccm (int unit, ext_accm accm) MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n", accm[0], accm[1], accm[2], accm[3])); - if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) + if (ioctl(ttyfd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) { syslog(LOG_WARNING, "ioctl(set extended ACCM): %m"); } @@ -693,13 +750,13 @@ void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp) /* * Set the receiver parameters */ - if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) + if (ioctl(ttyfd, PPPIOCSMRU, (caddr_t) &mru) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m"); } MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap)); - if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) + if (ioctl(ttyfd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m"); quit(); @@ -724,7 +781,12 @@ int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit) data.length = opt_len; data.transmit = for_transmit; - return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0; + if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0) + { + return 1; + } + + return (errno == ENOBUFS)? 0: -1; } /* @@ -765,7 +827,7 @@ int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid) if (vjcomp) { - if (ioctl (fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) + if (ioctl (ttyfd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) { syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); vjcomp = 0; @@ -801,6 +863,7 @@ int sifup (int u) syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); return 0; } + if_is_up = 1; return 1; } @@ -827,6 +890,7 @@ int sifdown (int u) syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); return 0; } + if_is_up = 0; return 1; } @@ -900,6 +964,9 @@ int sifaddr (int unit, int our_adr, int his_adr, int net_mask) syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m"); return (0); } + + ipaddrs[0] = our_adr; + ipaddrs[1] = his_adr; return 1; } @@ -911,6 +978,8 @@ int sifaddr (int unit, int our_adr, int his_adr, int net_mask) int cifaddr (int unit, int our_adr, int his_adr) { struct rtentry rt; + + ipaddrs[0] = 0; /* * Delete the route through the device */ @@ -924,10 +993,13 @@ int cifaddr (int unit, int our_adr, int his_adr) ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; rt.rt_flags = RTF_UP | RTF_HOST; - if (ioctl(sockfd, SIOCDELRT, &rt) < 0) + if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH) { - syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m"); - return (0); + if (still_ppp()) + { + syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m"); + return (0); + } } return 1; } @@ -937,7 +1009,7 @@ int cifaddr (int unit, int our_adr, int his_adr) */ FILE *route_fd = (FILE *) 0; -static char route_buffer [100]; +static char route_buffer [512]; static char *path_to_route (void); static int open_route_table (void); @@ -1017,13 +1089,6 @@ static int open_route_table (void) syslog (LOG_ERR, "can not open %s: %m", path); return 0; } - - /* read and discard the header line. */ - if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) - { - close_route_table(); - return 0; - } return 1; } @@ -1035,18 +1100,34 @@ static int read_route_table (struct rtentry *rt) { static char delims[] = " \t\n"; char *dev_ptr, *ptr, *dst_ptr, *gw_ptr, *flag_ptr; + + memset (rt, '\0', sizeof (struct rtentry)); - if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) + for (;;) { - return 0; - } - - memset (rt, '\0', sizeof (struct rtentry)); + if (fgets (route_buffer, sizeof (route_buffer), route_fd) == + (char *) 0) + { + return 0; + } - dev_ptr = strtok (route_buffer, delims); /* interface name */ - dst_ptr = strtok (NULL, delims); /* destination address */ - gw_ptr = strtok (NULL, delims); /* gateway */ - flag_ptr = strtok (NULL, delims); /* flags */ + dev_ptr = strtok (route_buffer, delims); /* interface name */ + dst_ptr = strtok (NULL, delims); /* destination address */ + gw_ptr = strtok (NULL, delims); /* gateway */ + flag_ptr = strtok (NULL, delims); /* flags */ + + if (flag_ptr == (char *) 0) /* assume that we failed, somewhere. */ + { + return 0; + } + + /* Discard that stupid header line which should never + * have been there in the first place !! */ + if (isxdigit (*dst_ptr) && isxdigit (*gw_ptr) && isxdigit (*flag_ptr)) + { + break; + } + } ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr = strtoul (dst_ptr, NULL, 16); @@ -1125,6 +1206,7 @@ int sifdefaultroute (int unit, int gateway) } } has_default_route = 1; + default_route_gateway = g; return 1; } @@ -1144,9 +1226,9 @@ int cifdefaultroute (int unit, int gateway) ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway; rt.rt_flags = RTF_UP | RTF_GATEWAY; - if (ioctl(sockfd, SIOCDELRT, &rt) < 0) + if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH) { - if (errno != ENOENT || still_ppp()) + if (still_ppp()) { syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m"); return 0; @@ -1189,6 +1271,7 @@ int sifproxyarp (int unit, u_int32_t his_adr) } } + proxy_arp_addr = hisaddr; has_proxy_arp = 1; return 1; } @@ -1222,7 +1305,7 @@ int cifproxyarp (int unit, u_int32_t his_adr) * the same subnet as ipaddr. */ -int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr) +static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr) { struct ifreq *ifr, *ifend, *ifp; int i;