/* Pfinet option parsing Copyright (C) 1996,97,2000,01 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; 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); /* XXX how do we figure out the default gateway? */ #undef ADD_ADDR_OPT #undef ADD_OPT return err; } return enumerate_devices (add_dev_opts); }