Ax25d-zia.c

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/*

*  This is my version of axl.c, written for the LBBS code to make it
*    compatable with the kernel AX25 driver.  It appears to work, with
*    my setup, so it'll probably not work else where :-).
*
*  This was inspired by the example code written by Alan Cox (GW4PTS)
*    axl.c in AX25USER.TGZ from sunacm.swan.ac.uk.
*
*
*  Copyright (C) 1995, 1996 by Darryl L. Miles, G7LED.
*  Copyright (C) 1996 by Jonathan Naylor G4KLX
*
*   This program 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 of the License, or
*   (at your option) any later version.
*
*   This program 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.
*
*
*
*  Just a quickie Feb 1995.
*  It *was* just a quickie (at the time) but you'd know how these things
*   just... Apr 1995.
*
*  If your AX25/NETROM system is relying on this code for
*    securetty/firewalling then please be aware this has been coded
*    with the intent on striving on through system/(mis)configuration
*    errors in the hope that at worst it will run with a degraded
*    service.  Rather than leave your system providing no service at
*    all, if opinions require the old behavior back when let me know
*    and I'll #ifdef it in.
*
*
*  History:
*
*	1.0  Feb 1995	Basic AX25 listening daemon, Multi-port, Call
*			  matching, etc...
*
*	1.1  Feb 1995	Moved entry scanning before fork().
*			Added setgroups() to plug security hole.
*			Minor fixes + Improved handling.
*
*	1.2  Apr 1995   NETROM support added from developing AX25
*			  028b/029.
*			Added 'defaults' port setting.
*			Added FLAG_NODIGIS.
*
*	1.3  Jul 1995	Make it a little more intelligent about what to
*			  do with errors.
*			Added exec and argv[0] as two different fields,
*			  much like inetd uses.
*
*	1.4  Aug 1995	Confirmed support for AX25 030 (1.3.20 + hacks),
*			  it appears to work.
*			It will now bootup even if initial config errors
*			  occur when setting up and binding (e.g. port(s)
*			  down), it will skip the port(s) with a problem
*			  and listen out on those which are left standing.
*
*	1.5  Aug 1995	Updated old (buggy) libax25.a function copies in axl.
*			  Causing all sorts of problems.
*
*	1.6  Aug 1995	Reset the 'defaults' entry's when we start parsing
*			  a new interface.
*
*	1.7  Dec 1995	Added BROKEN_NETROM_KERNEL define for setsockopt.	
*
*	1.8  Jan 1996	Added support for AX25_BIND_ANY_DEVICE, specify just
*			  [CALL-X VIA *].
*			Better param parsing, T1 and T2 now using the real
*			  time in seconds as params, and not kernel units.
*			Connection loggin added, either via it's own logfile
*			  or syslog.
*			Modified 'defaults' to 'parameters'.
*
*	1.9  Jun 1996	Reworked config file parsing to use port names instead
*			  of callsigns. Reformated source code.
*
*	Under alpha:
*			BPQ like clever mode called for.... also a mode that
*			  requires a packet to kick application open.
*			A flag/mode which will cause a call to initgroups()
*			  based on uid.
*			Callsign validation check.
*			Logging of errors.
*
*
*  TODO:
*         The timing of the 'accept()' might be changed, defered to the
*           child, then that child fork() itself, to stop race conditions
*           around 'accept()'.
*         Add a config file to allow/disallow connections/services at
*           different times of the day to restrict access say.
*/
  1. include <stdio.h>
  2. include <stdlib.h>
  3. include <unistd.h>
  4. include <signal.h>
  5. include <string.h>
  6. include <ctype.h>
  7. include <time.h>
  8. include <pwd.h>
  9. include <grp.h>
  10. include <syslog.h>
  11. include <errno.h>
  1. include <config.h>
  1. include <sys/time.h>
  2. include <sys/types.h>
  3. include <sys/fcntl.h>
  4. include <sys/file.h>
  5. include <sys/stat.h>
  6. include <sys/ioctl.h>
  7. include <sys/socket.h>
  1. ifdef HAVE_NETAX25_AX25_H
  2. include <netax25/ax25.h>
  3. else
  4. include <netax25/kernel_ax25.h>
  5. endif
  6. ifdef HAVE_NETROM_NETROM_H
  7. include <netrom/netrom.h>
  8. else
  9. include <netax25/kernel_netrom.h>
  10. endif
  11. ifdef HAVE_NETROSE_ROSE_H
  12. include <netrose/rose.h>
  13. else
  14. include <netax25/kernel_rose.h>
  15. endif
  1. include <netax25/axlib.h>
  2. include <netax25/axconfig.h>
  3. include <netax25/nrconfig.h>
  4. include <netax25/rsconfig.h>
  5. include <netax25/daemon.h>

// for my local source tree // #define AX25_SYSCONFDIR "/etc/ax25/" // #include "ax25dpathnames.h"

// for original ax25-tools

  1. include "../pathnames.h"

/* Maximum number of command line arguments for the application we run */

  1. define MAX_ARGS 32
  1. define FLAG_VALIDCALL 0x01 /* NOTUSED */
  2. define FLAG_NOLOGGING 0x02 /* Don't log this connection */
  3. define FLAG_CHKNRN 0x04 /* Check NetRom Neighbour - NOTUSED */
  4. define FLAG_NODIGIS 0x08 /* Disallow digipeated uplinks */
  5. define FLAG_LOCKOUT 0x10 /* Disallow connection */


struct axlist { /* Have used same struct for quickness */ struct axlist *next; /* Port list */

char *port; /* Port call, only set across the port list */ int fd; /* The listening socket fd */

int af_type; /* AF_AX25, AF_NETROM or AF_ROSE port */

struct axlist *ents; /* Exec line entries */ char *call; /* Call in listing entries */ char *node; /* Node call in listing entries */ uid_t uid; /* UID to run program as */ gid_t gid; /* GID to run program as */ char *exec; /* Real exec */ char *shell; /* Command line. With possible escapes. */

unsigned int window; /* Set window to... */ unsigned long t1; /* Set T1 to... (Retrans timer) */ unsigned long t2; /* Set T2 to... (Ack delay) */ unsigned long t3; /* Set T3 to... (Idle Poll timer) */ unsigned long idle; /* Set T4 to... (Link Drop timer) */ unsigned long n2; /* Set N2 to... (Retries) */ unsigned long flags; /* FLAG_ values ORed... */ };

static struct axlist *AXL = NULL; static char *ConfigFile = CONF_AX25D_FILE; static char User[10]; /* Room for 'GB9ZZZ-15\0' */ static char Node[11]; /* Room for 'GB9ZZZ-15\0' */ static char *Port; static sig_atomic_t Update = TRUE; /* Cause update on bootup */ static int Logging = FALSE; static int nofork = FALSE;

static void SignalHUP(int); static void SignalTERM(int); static void WorkoutArgs(int, char *, int *, char **); static void SetupOptions(int, struct axlist *); static int ReadConfig(void); static unsigned long ParseFlags(const char *, int); static struct axlist *ClearList(struct axlist *); static char *stripssid(const char *);


int main(int argc, char *argv[]) { struct axlist *axltmp, *paxl, *raxl; union { struct full_sockaddr_ax25 ax25; struct sockaddr_rose rose; } sockaddr; struct sigaction act, oact; int maxfd = -1; fd_set fdread; int addrlen; int cnt;

while ((cnt = getopt(argc, argv, "c:lnv")) != EOF) { switch (cnt) { case 'c': ConfigFile = optarg; break;

case 'l': Logging = TRUE; break;

           case 'n':
               nofork = TRUE;
               break;

case 'v': printf("ax25d: %s\n", VERSION); return 1;

default: fprintf(stderr, "Usage: ax25d [-v] [-c altfile] [-l]\n"); return 1; } }


if (ax25_config_load_ports() == 0) { fprintf(stderr, "ax25d: no AX.25 port data configured\n"); return 1; }

nr_config_load_ports();

rs_config_load_ports();

   if (!nofork){
       if (!daemon_start(TRUE)) {
           fprintf(stderr, "ax25d: cannot become a daemon\n");
           return 1;
       }
   }

if (Logging) { openlog("ax25d", LOG_PID, LOG_DAEMON); syslog(LOG_INFO, "starting"); }

act.sa_handler = SignalHUP; sigemptyset(&act.sa_mask); act.sa_flags = 0; sigaction(SIGHUP, &act, &oact);

act.sa_handler = SignalTERM; sigemptyset(&act.sa_mask); act.sa_flags = 0; sigaction(SIGTERM, &act, &oact);

for (;;) { if (Update) { if (ReadConfig() < 0) { if (AXL == NULL) { if (Logging) syslog(LOG_ERR, "config file reload error, exiting"); return 1; } else { if (Logging) syslog(LOG_INFO, "config file reload error, continuing with original"); } } else { if (Logging) syslog(LOG_INFO, "new config file loaded successfuly"); }

Update = FALSE; }

FD_ZERO(&fdread);

for (paxl = AXL; paxl != NULL && paxl->fd >= 0; paxl = paxl->next) { FD_SET(paxl->fd, &fdread);

if (paxl->fd > maxfd) maxfd = paxl->fd; }

if (select(maxfd + 1, &fdread, NULL, NULL, NULL) <= 0) continue;

for (paxl = AXL; paxl != NULL; paxl = paxl->next) { if (FD_ISSET(paxl->fd, &fdread)) { pid_t pid; gid_t grps[2]; char *argv[MAX_ARGS]; int argc; int new; int i;

/* * Setting up a non-blocking accept() so is does not hang up * - I am not sure at this time why I didn't/don't assign * the socket non-blocking to start with. */ /* * We really need to setup the netrom window option here so * that it's negotiated correctly on accepting the connection. */ /* * It would be very useful if recvmsg/sendmsg were supported * then we can move the call checking up here. */ i = TRUE; ioctl(paxl->fd, FIONBIO, &i);

addrlen = sizeof(struct full_sockaddr_ax25); new = accept(paxl->fd, (struct sockaddr *)&sockaddr, &addrlen);

i = FALSE; ioctl(paxl->fd, FIONBIO, &i);

if (new < 0) { if (errno == EWOULDBLOCK) continue; /* It's gone ??? */

if (Logging) syslog(LOG_ERR, "ax25d: accept error %m, closing socket on port %s", paxl->port); close(paxl->fd); paxl->fd = -1;

                   if (nofork) {
                       syslog(LOG_ERR, "ax25d: exiting ax25d to be respawned again");
                       exit(0);
                   }

continue; }

switch (paxl->af_type) { case AF_AX25: strcpy(User, ax25_ntoa(&sockaddr.ax25.fsa_ax25.sax25_call)); strcpy(Node, ""); break; case AF_NETROM: strcpy(User, ax25_ntoa(&sockaddr.ax25.fsa_ax25.sax25_call)); strcpy(Node, ax25_ntoa(&sockaddr.ax25.fsa_digipeater[0])); break; case AF_ROSE: strcpy(User, ax25_ntoa(&sockaddr.rose.srose_call)); strcpy(Node, rose_ntoa(&sockaddr.rose.srose_addr)); break; }

for (raxl = paxl->ents; raxl != NULL; raxl = raxl->ents) { if (paxl->af_type == AF_NETROM && raxl->node != NULL && Node[0] != '\0') { if (strchr(raxl->node, '-') == NULL) { if (strcasecmp(raxl->node, stripssid(Node)) != 0) continue; /* Found no match (for any SSID) */ } else { if (strcasecmp(raxl->node, Node) != 0) continue; /* Found no match */ } }

if (raxl->call == NULL) /* default */ break;

if (strchr(raxl->call, '-') == NULL) { if (strcasecmp(raxl->call, stripssid(User)) == 0) break; /* Found a match (for any SSID) */ } else { if (strcasecmp(raxl->call, User) == 0) break; /* Found a match */ } }

addrlen = sizeof(struct full_sockaddr_ax25); getsockname(new, (struct sockaddr *)&sockaddr, &addrlen);

switch (paxl->af_type) { case AF_AX25: Port = ax25_config_get_port(&sockaddr.ax25.fsa_digipeater[0]); break; case AF_NETROM: Port = nr_config_get_port(&sockaddr.ax25.fsa_ax25.sax25_call); break; case AF_ROSE: Port = rs_config_get_port(&sockaddr.rose.srose_addr); break; default: Port = "???"; break; }

if (raxl == NULL) { /* No default */ if (Logging && !(paxl->flags & FLAG_NOLOGGING)) { switch (paxl->af_type) { case AF_AX25: syslog(LOG_INFO, "AX.25 %s (%s) rejected - no default", User, Port); break; case AF_NETROM: syslog(LOG_INFO, "NET/ROM %s@%s (%s) rejected - no default", User, Node, Port); break; case AF_ROSE: syslog(LOG_INFO, "Rose %s@%s (%s) rejected - no default", User, Node, Port); break; } } close(new); continue; }

if (raxl->flags & FLAG_LOCKOUT) { /* Not allowed to connect */ if (Logging && !(paxl->flags & FLAG_NOLOGGING)) { switch (raxl->af_type) { case AF_AX25: syslog(LOG_INFO, "AX.25 %s (%s) rejected - port locked", User, Port); break; case AF_NETROM: syslog(LOG_INFO, "NET/ROM %s@%s (%s) rejected - port locked", User, Node, Port); break; case AF_ROSE: syslog(LOG_INFO, "Rose %s@%s (%s) rejected - port locked", User, Node, Port); break; } } close(new); continue; }

if (raxl->af_type == AF_AX25 && (raxl->flags & FLAG_NODIGIS) && sockaddr.ax25.fsa_ax25.sax25_ndigis != 0) { /* Not allowed to uplink via digi's */ if (Logging && !(paxl->flags & FLAG_NOLOGGING)) syslog(LOG_INFO, "AX.25 %s (%s) rejected - digipeaters", User, Port); close(new); continue; }

pid = fork();

switch (pid) { case -1: if (Logging) syslog(LOG_ERR, "fork error %m"); /* * I don't think AX25 at the moment will hold the * connection open, if the above does not make it * through first time. */ close(new); break; /* Oh well... */

case 0: SetupOptions(new, raxl); WorkoutArgs(raxl->af_type, raxl->shell, &argc, argv);

if (Logging && !(paxl->flags & FLAG_NOLOGGING)) { switch (paxl->af_type) { case AF_AX25: syslog(LOG_INFO, "AX.25 %s (%s) %s", User, Port, argv[0]); break; case AF_NETROM: syslog(LOG_INFO, "NET/ROM %s@%s (%s) %s", User, Node, Port, argv[0]); break; case AF_ROSE: syslog(LOG_INFO, "Rose %s@%s (%s) %s", User, Node, Port, argv[0]); break; } }

dup2(new, STDIN_FILENO); dup2(new, STDOUT_FILENO); close(new);

/* * Might be more efficient if we just went down AXL, * we cleaned up our parents left overs on bootup. */ for (axltmp = AXL; axltmp != NULL; axltmp = axltmp->next) close(axltmp->fd);

if (Logging) closelog();

/* Make root secure, before we exec() */ setgroups(0, grps); /* Strip any supplementary gid's */ setgid(raxl->gid); setuid(raxl->uid); execve(raxl->exec, argv, NULL); return 1;

default: close(new); break; } } } }

/* NOT REACHED */ return 0; }

static void SignalHUP(int code) { Update = TRUE; /* Schedule an update */ }

static void SignalTERM(int code) { if (Logging) { syslog(LOG_INFO, "terminating on SIGTERM\n"); closelog(); }

exit(0); }

static void WorkoutArgs(int af_type, char *shell, int *argc, char **argv) { char buffer[1024]; /* Maximum arg size */ char *sp, *cp; int cnt = 0; int args = 0;

for (cp = shell; *cp != '\0'; cp++) { if (isspace(*cp) && cnt != 0) { buffer[cnt] = '\0'; argv[args++] = strdup(buffer); cnt = 0;

if (args == MAX_ARGS - 1) { argv[args] = NULL; *argc = args; return; }

continue; } else if (isspace(*cp)) /* && !cnt */ continue;

if (*cp == '%') { cp++;

switch(*cp) { case 'd': /* portname */ for (sp = Port; *sp != '\0' && *sp != '-'; sp++) buffer[cnt++] = *sp; break;

case 'U': /* username in UPPER */ for (sp = User; *sp != '\0' && *sp != '-'; sp++) buffer[cnt++] = toupper(*sp); break;

case 'u': /* USERNAME IN lower */ for (sp = User; *sp != '\0' && *sp != '-'; sp++) buffer[cnt++] = tolower(*sp); break;

case 'S': /* username in UPPER (with SSID) */ for (sp = User; *sp != '\0'; sp++) buffer[cnt++] = toupper(*sp); break;

case 's': /* USERNAME IN lower (with SSID) */ for (sp = User; *sp != '\0'; sp++) buffer[cnt++] = tolower(*sp); break;

case 'P': /* nodename in UPPER */ if (af_type == AF_NETROM) { for (sp = Node; *sp != '\0' && *sp != '-'; sp++) buffer[cnt++] = toupper(*sp); } else { buffer[cnt++] = '%'; } break;

case 'p': /* NODENAME IN lower */ if (af_type == AF_NETROM) { for(sp = Node; *sp != '\0' && *sp != '-'; sp++) buffer[cnt++] = tolower(*sp); } else { buffer[cnt++] = '%'; } break;

case 'R': /* nodename in UPPER (with SSID) */ if (af_type == AF_NETROM) { for (sp = Node; *sp != '\0'; sp++) buffer[cnt++] = toupper(*sp); } else { buffer[cnt++] = '%'; } break;

case 'r': /* NODENAME IN lower (with SSID) */ if (af_type == AF_NETROM) { for (sp = Node; *sp != '\0'; sp++) buffer[cnt++] = tolower(*sp); } else { buffer[cnt++] = '%'; } break;

case '\0': case '%': default: buffer[cnt++] = '%'; break; } } else { buffer[cnt++] = *cp; } }

if (cnt != 0) { buffer[cnt] = '\0'; argv[args++] = strdup(buffer); }

argv[args] = NULL; *argc = args; }

static void SetupOptions(int new, struct axlist *axl) { switch (axl->af_type) { case AF_AX25: if (axl->window != 0) setsockopt(new, SOL_AX25, AX25_WINDOW, &axl->window, sizeof(axl->window)); if (axl->t1 != 0) setsockopt(new, SOL_AX25, AX25_T1, &axl->t1, sizeof(axl->t1)); if (axl->n2 != 0) setsockopt(new, SOL_AX25, AX25_N2, &axl->n2, sizeof(axl->n2)); if (axl->t2 != 0) setsockopt(new, SOL_AX25, AX25_T2, &axl->t2, sizeof(axl->t2)); if (axl->t3 != 0) setsockopt(new, SOL_AX25, AX25_T3, &axl->t3, sizeof(axl->t3)); if (axl->idle != 0) setsockopt(new, SOL_AX25, AX25_IDLE, &axl->idle, sizeof(axl->idle)); break; case AF_NETROM: if (axl->t1 != 0) setsockopt(new, SOL_NETROM, NETROM_T1, &axl->t1, sizeof(axl->t1)); if (axl->n2 != 0) setsockopt(new, SOL_NETROM, NETROM_N2, &axl->n2, sizeof(axl->n2)); if (axl->t2 != 0) setsockopt(new, SOL_NETROM, NETROM_T2, &axl->t2, sizeof(axl->t2)); break; case AF_ROSE: if (axl->idle != 0) setsockopt(new, SOL_ROSE, ROSE_IDLE, &axl->idle, sizeof(axl->idle)); break; } }

/**************************** CONFIGURATION STUFF ***************************/

static int ReadConfig(void) { struct axlist axl_defaults; struct axlist *axl_build = NULL; struct axlist *axl_port = NULL; struct axlist *axl_ent, *axltmp; union { struct full_sockaddr_ax25 ax25; struct sockaddr_rose rose; } sockaddr; struct passwd *pwd; FILE *fp; char buffer[2048]; char *s, *port, *call, *node, *addr = NULL; unsigned long val; int addrlen; int af_type = 0; /* Keep GCC happy */ int line = 0; int hunt = TRUE, error = FALSE; int iamdigi = FALSE; int parameters = 0;

memset(&axl_defaults, 0, sizeof(axl_defaults));

if ((fp = fopen(ConfigFile, "r")) == NULL) return -1;

while (fgets(buffer, sizeof(buffer), fp) != NULL) { line++;

if ((s = strchr(buffer, '\n')) != NULL) *s = '\0'; if ((s = strchr(buffer, '\r')) != NULL) *s = '\0';

if (buffer[0] == '#') continue;

switch (buffer[0]) { case '[': /* AX25 port call */ af_type = AF_AX25; hunt = TRUE; error = FALSE; iamdigi = FALSE; break;

case '<': /* NETROM iface call */ af_type = AF_NETROM; hunt = TRUE; error = FALSE; iamdigi = FALSE; break;

case '{': /* ROSE iface call */ af_type = AF_ROSE; hunt = TRUE; error = FALSE; iamdigi = FALSE; break;

default: if (hunt && !error) goto BadLine; break; }

if (hunt) { /* We've found a Iface entry */ /* Reset 'defaults' entry on the interface */ memset(&axl_defaults, 0, sizeof(axl_defaults));

switch (af_type) { case AF_AX25: if ((s = strchr(buffer, ']')) == NULL) goto BadLine; *s = '\0'; if ((s = strtok(buffer + 1, " \t")) == NULL) goto BadLine; port = s; call = NULL; if ((s = strtok(NULL, " \t")) != NULL) { if (strcasecmp(s, "VIA") == 0 || strcasecmp(s, "V") == 0) { if ((s = strtok(NULL, " \t")) == NULL) goto BadLine; }

call = port; port = s;

if ((s = strchr(call, '*')) != NULL) { iamdigi = TRUE; *s = '\0'; } } if (strcmp(port, "*") == 0 && call == NULL) { fprintf(stderr, "ax25d: invalid port name\n"); continue; } if (strcmp(port, "*") != 0) { if ((addr = ax25_config_get_addr(port)) == NULL) { fprintf(stderr, "ax25d: invalid AX.25 port '%s'\n", port); continue; } } if (call == NULL) { sockaddr.ax25.fsa_ax25.sax25_family = AF_AX25; sockaddr.ax25.fsa_ax25.sax25_ndigis = 0; ax25_aton_entry(addr, sockaddr.ax25.fsa_ax25.sax25_call.ax25_call); } else { sockaddr.ax25.fsa_ax25.sax25_family = AF_AX25; sockaddr.ax25.fsa_ax25.sax25_ndigis = 1; ax25_aton_entry(call, sockaddr.ax25.fsa_ax25.sax25_call.ax25_call); if (strcmp(port, "*") != 0) ax25_aton_entry(addr, sockaddr.ax25.fsa_digipeater[0].ax25_call); else sockaddr.ax25.fsa_digipeater[0] = null_ax25_address; } addrlen = sizeof(struct full_sockaddr_ax25); break;

case AF_NETROM: if ((s = strchr(buffer, '>')) == NULL) goto BadLine; *s = '\0'; port = buffer + 1; if ((addr = nr_config_get_addr(port)) == NULL) { fprintf(stderr, "ax25d: invalid NET/ROM port '%s'\n", port); continue; } sockaddr.ax25.fsa_ax25.sax25_family = AF_NETROM; sockaddr.ax25.fsa_ax25.sax25_ndigis = 0; ax25_aton_entry(addr, sockaddr.ax25.fsa_ax25.sax25_call.ax25_call); addrlen = sizeof(struct full_sockaddr_ax25); break;

case AF_ROSE: if ((s = strchr(buffer, '}')) == NULL) goto BadLine; *s = '\0'; if ((s = strtok(buffer + 1, " \t")) == NULL) goto BadLine; call = s; if ((s = strtok(NULL, " \t")) == NULL) goto BadLine; if (strcasecmp(s, "VIA") == 0 || strcasecmp(s, "V") == 0) { if ((s = strtok(NULL, " \t")) == NULL) goto BadLine; } port = s; if ((addr = rs_config_get_addr(port)) == NULL) { fprintf(stderr, "ax25d: invalid Rose port '%s'\n", port); continue; } if (strcmp(call, "*") == 0) { sockaddr.rose.srose_family = AF_ROSE; sockaddr.rose.srose_ndigis = 0; rose_aton(addr, sockaddr.rose.srose_addr.rose_addr); sockaddr.rose.srose_call = null_ax25_address; } else { sockaddr.rose.srose_family = AF_ROSE; sockaddr.rose.srose_ndigis = 0; rose_aton(addr, sockaddr.rose.srose_addr.rose_addr); ax25_aton_entry(call, sockaddr.rose.srose_call.ax25_call); } addrlen = sizeof(struct sockaddr_rose); break;

default: fprintf(stderr, "ax25d: unknown af_type=%d\n", af_type); exit(1); }

if ((axl_port = calloc(1, sizeof(*axl_port))) == NULL) { fprintf(stderr, "ax25d: out of memory\n"); goto Error; }

axl_port->port = strdup(port); axl_port->af_type = af_type;

if ((axl_port->fd = socket(axl_port->af_type, SOCK_SEQPACKET, 0)) < 0) { fprintf(stderr, "ax25d: socket: %s\n", strerror(errno)); free(axl_port->port); free(axl_port); error = TRUE; continue; }

                       /* xlz - have to nuke this as this option is gone
                        * what should be here?

if (iamdigi) { yes = 1; setsockopt(axl_port->fd, SOL_AX25, AX25_IAMDIGI, &yes, sizeof(yes)); }

                       */

if (bind(axl_port->fd, (struct sockaddr *)&sockaddr, addrlen) < 0) { fprintf(stderr, "ax25d: bind: %s on port %s\n", strerror(errno), axl_port->port); close(axl_port->fd); free(axl_port->port); free(axl_port); error = TRUE; continue; }

if (listen(axl_port->fd, SOMAXCONN) < 0) { fprintf(stderr, "ax25d: listen: %s\n", strerror(errno)); close(axl_port->fd); free(axl_port->port); free(axl_port); error = TRUE; continue; }

/* Add it to the head of the list we are building */ if (axl_build == NULL) { axl_build = axl_port; } else { for (axltmp = axl_build; axltmp->next != NULL; axltmp = axltmp->next); axltmp->next = axl_port; }

hunt = FALSE; /* Next lines will be entries */ } else { /* This is an entry */ if ((axl_ent = calloc(1, sizeof(*axl_ent))) == NULL) { fprintf(stderr, "ax25d: out of memory\n"); goto Error; }

axl_ent->af_type = axl_port->af_type; /* Inherit this */

if ((call = strtok(buffer, " \t")) == NULL) { free(axl_ent); continue; }

strupr(call);

if (axl_ent->af_type == AF_NETROM) { if ((s = strchr(call, '@')) != NULL) { node = s + 1; *s = '\0';

if (*node == '\0') { free(axl_ent); continue; }

axl_ent->node = strdup(node);

if (*call == '\0') call = "default"; /* @NODE means default@NODE */ } }

parameters = FALSE;

if (strcasecmp("parameters", call) == 0) parameters = TRUE; else if (strcasecmp("default", call) != 0) axl_ent->call = strdup(call);

/* Window */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if (!parameters) { if (strcmp(s, "*") != 0) axl_ent->window = atoi(s); else axl_ent->window = axl_defaults.window; } else { if (strcmp(s, "*") != 0) axl_defaults.window = atoi(s); }

/* T1 */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if (!parameters) { if (strcmp(s, "*") != 0) { val = (unsigned long)(atof(s) / 0.1);

if (val == 0 || val > 65535) axl_ent->t1 = axl_defaults.t1; else axl_ent->t1 = val; } else { axl_ent->t1 = axl_defaults.t1; } } else { if (strcmp(s, "*") != 0) { val = (unsigned long)(atof(s) / 0.1);

if (val > 0 && val < 65535) axl_defaults.t1 = val; } }

/* T2 */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if (!parameters) { if (strcmp(s, "*") != 0) { val = (unsigned long)(atof(s) / 0.1);

if (val == 0 || val > 65535) axl_ent->t2 = axl_defaults.t2; else axl_ent->t2 = val; } else { axl_ent->t2 = axl_defaults.t2; } } else { if (strcmp(s, "*") != 0) { val = (unsigned long)(atof(s) / 0.1);

if (val > 0 && val < 65535) axl_defaults.t2 = val; } }

/* T3 */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if (!parameters) { if (strcmp(s, "*") != 0) axl_ent->t3 = atoi(s); else axl_ent->t3 = axl_defaults.t3; } else { if (strcmp(s, "*") != 0) axl_defaults.t3 = atoi(s); }

/* Idle */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if (!parameters) { if (strcmp(s, "*") != 0) axl_ent->idle = atoi(s); else axl_ent->idle = axl_defaults.idle; } else { if (strcmp(s, "*") != 0) axl_defaults.idle = atoi(s); }

/* N2 */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if (!parameters) { if (strcmp(s, "*") != 0) axl_ent->n2 = atoi(s); else axl_ent->n2 = axl_defaults.n2; } else { if (strcmp(s, "*") != 0) axl_defaults.n2 = atoi(s); }

if (!parameters) { /* Flags */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

axl_ent->flags = ParseFlags(s, line);

if (!(axl_ent->flags & FLAG_LOCKOUT)) { /* Get username */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

if ((pwd = getpwnam(s)) == NULL) { fprintf(stderr, "ax25d: UID for user '%s' is unknown, ignoring entry\n", s); goto BadUID; }

axl_ent->uid = pwd->pw_uid; axl_ent->gid = pwd->pw_gid;

/* Get exec file */ if ((s = strtok(NULL, " \t")) == NULL) goto BadArgsFree;

axl_ent->exec = strdup(s);

/* Get command line */ if ((s = strtok(NULL, "")) == NULL) goto BadArgsFree2;

axl_ent->shell = strdup(s); }

axl_ent->next = NULL;

if (axl_port->ents == NULL) { axl_port->ents = axl_ent; } else { for (axltmp = axl_port->ents; axltmp->ents != NULL; axltmp = axltmp->ents) ; axltmp->ents = axl_ent; } } }

continue;

BadLine: fprintf(stderr, "ax25d: bad config entry on line %d\n", line); continue;

BadUID: if (axl_ent->call != NULL) free(axl_ent->call); free(axl_ent); continue;

BadArgsFree2: if (axl_ent->exec != NULL) free(axl_ent->exec); BadArgsFree: if (axl_ent->call != NULL) free(axl_ent->call); free(axl_ent);

/* BadArgs: */ fprintf(stderr, "ax25d: bad config entry on line %d, not enough fields.\n", line); continue; }

fclose(fp);

AXL = ClearList(AXL); AXL = axl_build; /* Assign our built list to AXL */

return 0;

Error: axl_build = ClearList(axl_build); return -1; }

static unsigned long ParseFlags(const char *kp, int line) { unsigned long flags = 0UL;

for (; *kp != '\0'; kp++) { switch (*kp) { case 'v': case 'V': flags |= FLAG_VALIDCALL; break;

case 'q': case 'Q': flags |= FLAG_NOLOGGING; break;

case 'n': case 'N': flags |= FLAG_CHKNRN; break;

case 'd': case 'D': flags |= FLAG_NODIGIS; break;

case 'l': case 'L': flags |= FLAG_LOCKOUT; break;

case '0': case '*': case '-': /* Be compatible and allow markers */ break;

default: fprintf(stderr, "ax25d: config file line %d bad flag option '%c'.\n", line, *kp); break; } }

return flags; }

static struct axlist *ClearList(struct axlist *list) { struct axlist *tp1, *tp2, *tmp;

for (tp1 = list; tp1 != NULL; ) { for (tp2 = tp1->ents; tp2 != NULL; ) { if (tp2->port != NULL) free(tp2->port); if (tp2->call != NULL) free(tp2->call); if (tp2->node != NULL) free(tp2->node); if (tp2->exec != NULL) free(tp2->exec); if (tp2->shell != NULL) free(tp2->shell);

tmp = tp2->ents; free(tp2); tp2 = tmp; }

if (tp1->port != NULL) free(tp1->port); if (tp1->call != NULL) free(tp1->call); if (tp1->node != NULL) free(tp1->node); if (tp1->exec != NULL) free(tp1->exec); if (tp1->shell != NULL) free(tp1->shell);

close(tp1->fd);

tmp = tp1->next; free(tp1); tp1 = tmp; }

return NULL; }

static char *stripssid(const char *call) { static char newcall[10]; char *s;

strcpy(newcall, call);

if ((s = strchr(newcall, '-')) != NULL) *s = '\0';

return newcall; }