/* Pfinet option parsing Copyright (C) 1996, 1997, 2000, 2001, 2006 Free Software Foundation, Inc. Written by Miles Bader This file is part of the GNU Hurd. The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include "pfinet.h" #include #include #include #include #include #include #include /* Our interface to the set of devices. */ extern error_t find_device (char *name, struct device **device); extern error_t enumerate_devices (error_t (*fun) (struct device *dev)); /* devinet.c */ extern error_t configure_device (struct device *dev, uint32_t addr, uint32_t netmask, uint32_t peer, uint32_t broadcast); extern void inquire_device (struct device *dev, uint32_t *addr, uint32_t *netmask, uint32_t *peer, uint32_t *broadcast); /* Pfinet options. Used for both startup and runtime. */ static const struct argp_option options[] = { {"interface", 'i', "DEVICE", 0, "Network interface to use", 1}, {0,0,0,0,"These apply to a given interface:", 2}, {"address", 'a', "ADDRESS", 0, "Set the network address"}, {"netmask", 'm', "MASK", 0, "Set the netmask"}, {"peer", 'p', "ADDRESS", 0, "Set the peer address"}, {"gateway", 'g', "ADDRESS", 0, "Set the default gateway"}, {"shutdown", 's', 0, 0, "Shut it down"}, {0} }; static const char doc[] = "Interface-specific options before the first \ interface specification apply to the first following interface; otherwise \ they apply to the previously specified interface."; /* Used to describe a particular interface during argument parsing. */ struct parse_interface { /* The network interface in question. */ struct device *device; /* New values to apply to it. */ uint32_t address, netmask, peer, gateway; }; /* Used to hold data during argument parsing. */ struct parse_hook { /* A list of specified interfaces and their corresponding options. */ struct parse_interface *interfaces; size_t num_interfaces; /* Interface to which options apply. If the device field isn't filled in then it should be by the next --interface option. */ struct parse_interface *curint; }; /* Adds an empty interface slot to H, and sets H's current interface to it, or returns an error. */ static error_t parse_hook_add_interface (struct parse_hook *h) { struct parse_interface *new = realloc (h->interfaces, (h->num_interfaces + 1) * sizeof (struct parse_interface)); if (! new) return ENOMEM; h->interfaces = new; h->num_interfaces++; h->curint = new + h->num_interfaces - 1; h->curint->device = 0; h->curint->address = INADDR_NONE; h->curint->netmask = INADDR_NONE; h->curint->peer = INADDR_NONE; h->curint->gateway = INADDR_NONE; return 0; } static error_t parse_opt (int opt, char *arg, struct argp_state *state) { error_t err = 0; struct parse_hook *h = state->hook; /* Return _ERR from this routine, and in the special case of OPT being ARGP_KEY_SUCCESS, remember to free H first. */ #define RETURN(_err) \ do { if (opt == ARGP_KEY_SUCCESS) \ { err = (_err); goto free_hook; } \ else \ return _err; } while (0) /* Print a parsing error message and (if exiting is turned off) return the error code ERR. */ #define PERR(err, fmt, args...) \ do { argp_error (state, fmt , ##args); RETURN (err); } while (0) /* Like PERR but for non-parsing errors. */ #define FAIL(rerr, status, perr, fmt, args...) \ do{ argp_failure (state, status, perr, fmt , ##args); RETURN (rerr); } while(0) /* Parse STR and return the corresponding internet address. If STR is not a valid internet address, signal an error mentioned TYPE. */ #undef ADDR #define ADDR(str, type) \ ({ unsigned long addr = inet_addr (str); \ if (addr == INADDR_NONE) PERR (EINVAL, "Malformed %s", type); \ addr; }) switch (opt) { struct parse_interface *in; uint32_t gateway; case 'i': /* An interface. */ err = 0; if (h->curint->device) /* The current interface slot is not available. */ { /* First see if a previously specified one is being re-specified. */ for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) if (strcmp (in->device->name, arg) == 0) /* Re-use an old slot. */ { h->curint = in; return 0; } /* Add a new interface entry. */ err = parse_hook_add_interface (h); } in = h->curint; if (! err) err = find_device (arg, &in->device); if (err) FAIL (err, 10, err, "%s", arg); break; case 'a': h->curint->address = ADDR (arg, "address"); if (!IN_CLASSA (ntohl (h->curint->address)) && !IN_CLASSB (ntohl (h->curint->address)) && !IN_CLASSC (ntohl (h->curint->address))) { if (IN_MULTICAST (ntohl (h->curint->address))) FAIL (EINVAL, 1, 0, "%s: Cannot set interface address to multicast address", arg); else FAIL (EINVAL, 1, 0, "%s: Illegal or undefined network address", arg); } break; case 'm': h->curint->netmask = ADDR (arg, "netmask"); break; case 'p': h->curint->peer = ADDR (arg, "peer"); break; case 'g': h->curint->gateway = ADDR (arg, "gateway"); break; case ARGP_KEY_INIT: /* Initialize our parsing state. */ h = malloc (sizeof (struct parse_hook)); if (! h) FAIL (ENOMEM, 11, ENOMEM, "option parsing"); h->interfaces = 0; h->num_interfaces = 0; err = parse_hook_add_interface (h); if (err) FAIL (err, 12, err, "option parsing"); state->hook = h; break; case ARGP_KEY_SUCCESS: in = h->curint; if (! in->device) /* No specific interface specified; is that ok? */ if (in->address != INADDR_NONE || in->netmask != INADDR_NONE || in->gateway != INADDR_NONE) /* Some options were specified, so we need an interface. See if there's a single extant interface to use as a default. */ { err = find_device (0, &in->device); if (err) FAIL (err, 13, 0, "No default interface"); } #if 0 /* XXX what does this mean??? */ /* Check for bogus option combinations. */ for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) if (in->netmask != INADDR_NONE && in->address == INADDR_NONE && in->device->pa_addr == 0) /* Specifying a netmask for an address-less interface is a no-no. */ FAIL (EDESTADDRREQ, 14, 0, "Cannot set netmask"); #endif gateway = INADDR_NONE; for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) if (in->gateway != INADDR_NONE) { if (gateway != INADDR_NONE) FAIL (err, 15, 0, "Cannot have multiple default gateways"); gateway = in->gateway; in->gateway = INADDR_NONE; } /* Successfully finished parsing, return a result. */ __mutex_lock (&global_lock); for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) if (in->address != INADDR_NONE || in->netmask != INADDR_NONE) { err = configure_device (in->device, in->address, in->netmask, in->peer, INADDR_NONE); if (err) { __mutex_unlock (&global_lock); FAIL (err, 16, 0, "cannot configure interface"); } } /* Set the default gateway. This code is cobbled together from what the SIOCADDRT ioctl code does, and from the apparent functionality of the "netlink" layer from perusing a little. */ { struct kern_rta rta; struct { struct nlmsghdr nlh; struct rtmsg rtm; } req; struct fib_table *tb; req.nlh.nlmsg_pid = 0; req.nlh.nlmsg_seq = 0; req.nlh.nlmsg_len = NLMSG_LENGTH (sizeof req.rtm); bzero (&req.rtm, sizeof req.rtm); bzero (&rta, sizeof rta); req.rtm.rtm_scope = RT_SCOPE_UNIVERSE; req.rtm.rtm_type = RTN_UNICAST; req.rtm.rtm_protocol = RTPROT_STATIC; rta.rta_gw = &gateway; if (gateway == INADDR_NONE) { /* Delete any existing default route. */ req.nlh.nlmsg_type = RTM_DELROUTE; req.nlh.nlmsg_flags = 0; tb = fib_get_table (req.rtm.rtm_table); if (tb) { err = - (*tb->tb_delete) (tb, &req.rtm, &rta, &req.nlh, 0); if (err && err != ESRCH) { __mutex_unlock (&global_lock); FAIL (err, 17, 0, "cannot remove old default gateway"); } err = 0; } } else { /* Add a default route, replacing any existing one. */ req.nlh.nlmsg_type = RTM_NEWROUTE; req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE; tb = fib_new_table (req.rtm.rtm_table); err = (!tb ? ENOBUFS : - (*tb->tb_insert) (tb, &req.rtm, &rta, &req.nlh, 0)); if (err) { __mutex_unlock (&global_lock); FAIL (err, 17, 0, "cannot set default gateway"); } } } __mutex_unlock (&global_lock); /* Fall through to free hook. */ case ARGP_KEY_ERROR: /* Parsing error occured, free everything. */ free_hook: free (h->interfaces); free (h); break; default: return ARGP_ERR_UNKNOWN; } return err; } struct argp pfinet_argp = { options, parse_opt, 0, doc }; struct argp *trivfs_runtime_argp = &pfinet_argp; error_t trivfs_append_args (struct trivfs_control *fsys, char **argz, size_t *argz_len) { error_t add_dev_opts (struct device *dev) { error_t err = 0; uint32_t addr, mask, peer, broad; struct rt_key key = { 0 }; struct fib_result res; inquire_device (dev, &addr, &mask, &peer, &broad); #define ADD_OPT(fmt, args...) \ do { char buf[100]; \ if (! err) { \ snprintf (buf, sizeof buf, fmt , ##args); \ err = argz_add (argz, argz_len, buf); } } while (0) #define ADD_ADDR_OPT(name, addr) \ do { struct in_addr i; \ i.s_addr = (addr); \ ADD_OPT ("--%s=%s", name, inet_ntoa (i)); } while (0) ADD_OPT ("--interface=%s", dev->name); if (addr != INADDR_NONE) ADD_ADDR_OPT ("address", addr); if (mask != INADDR_NONE) ADD_ADDR_OPT ("netmask", mask); if (peer != addr) ADD_ADDR_OPT ("peer", peer); key.iif = dev->ifindex; if (! main_table->tb_lookup (main_table, &key, &res)) ADD_ADDR_OPT ("gateway", FIB_RES_GW (res)); #undef ADD_ADDR_OPT #undef ADD_OPT return err; } return enumerate_devices (add_dev_opts); }