spf.c

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/*
 * Copyright (c) 2013, 2014 The University of Utah
 *
 * 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, 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <signal.h>
#include <argp.h>

#include "log.h"
#include "glib_wrapper.h"
#include "dwdebug.h"
#include "target_api.h"
#include "target.h"
#include "target_os.h"

#include "probe_api.h"
#include "probe.h"
#include "alist.h"
#include "list.h"

/*
 * Private vdebug flags for LA_USER for us.
 */
#define LF_U_CFG   1 << 1
#define LF_U_PROBE 1 << 2

/*
 * Types.
 */
typedef enum {
    SPF_ACTION_PRINT   = 1,
    SPF_ACTION_ABORT   = 2,
    SPF_ACTION_REPORT  = 3,
    SPF_ACTION_EXIT    = 4,
    SPF_ACTION_ENABLE  = 5,
    SPF_ACTION_DISABLE = 6,
    SPF_ACTION_REMOVE  = 7,
    SPF_ACTION_BT      = 8,
    SPF_ACTION_SIGNAL  = 9,
} spf_action_type_t;

struct spf_action {
    spf_action_type_t atype;

    union {
    struct {
        char rt;
        char *tn;
        int tid;
        char *rv;
        char *msg;
        int ttctx;
        int ttdetail;
        int bt;
        int overlay_levels;
        char *overlay_debuginfo_prefix;
    } report;
    struct {
        int ttctx;
        int ttdetail;
    } print;
    struct {
        long int retval;
    } abort;
    struct {
        long int retval;
    } exit;
    struct {
        char *id;
    } enable;
    struct {
        char *id;
    } disable;
    struct {
        char *id;
    } remove;
    struct {
        int tid;
        char *thid;
        int overlay_levels;
        char *overlay_debuginfo_prefix;
    } bt;
    struct {
        int tid;
        char *thid;
        char *sigdesc;
    } signal;
    };
};

#define WHEN_PRE    0
#define WHEN_POST   1

struct spf_filter {
    char *id;

    char *srcfile;
    char *symbol;
    struct bsymbol *bsymbol;
    /* When it's applied; pre or post. */
    int when;
    uint8_t disable:1;
    /*
     * symbol value regexps
     */
    struct target_nv_filter *pf;
    /*
     * tid, ptid, tidhier^, uid, gid, name, namehier^...
     */
    struct target_nv_filter *ttf;
    GSList *actions;
};

struct spf_config {
    GSList *spf_filter_list;
};

struct overlay_spec {
    char *base_target_id;
    char *base_thread_name_or_id;
    struct target_spec *spec;
};

struct spf_argp_state {
    int argc;
    char **argv;
    char *config_file;
    int config_file_fatal;
    int use_os_syscall_probes;
    int ospecs_len;
    struct overlay_spec **ospecs;
};

/*
 * Globals.
 */
GList *targets;
struct spf_config *config = NULL;
struct spf_argp_state opts;

GHashTable *sprobes = NULL;
GHashTable *fprobes = NULL;

int needtodie = 0;
int needtodie_exitcode = 0;

int result_counter = 0;

/* A few prototypes. */
struct spf_config *load_config_file(char *file);
int apply_config_file(struct spf_config *config);
void reload_config_file(void);
void spf_action_free(struct spf_action *spfa);
void spf_filter_free(struct spf_filter *spff);
void spf_config_free(struct spf_config *config);


void cleanup_probes() {
    GHashTableIter iter;
    gpointer key;
    struct probe *probe;
    GList *t1;
    struct target *target;

    v_g_list_foreach(targets,t1,target) {
    target_pause(target);
    }

    if (fprobes) {
    g_hash_table_iter_init(&iter,fprobes);
    while (g_hash_table_iter_next(&iter,
                      (gpointer)&key,
                      (gpointer)&probe)) {
        probe_unregister(probe,1);
        probe_free(probe,1);
    }
    g_hash_table_destroy(fprobes);
    fprobes = NULL;
    }
    if (sprobes) {
    g_hash_table_iter_init(&iter,sprobes);
    while (g_hash_table_iter_next(&iter,
                      (gpointer)&key,
                      (gpointer)&probe)) {
        probe_unregister(probe,1);
        probe_free(probe,1);
    }
    g_hash_table_destroy(sprobes);
    sprobes = NULL;
    }
}

sigset_t ignored,interrupt,exitset;

void sigh_cleanup_probes(int signo,siginfo_t *siginfo,void *x) {
    if (sigismember(&exitset,signo)) {
    cleanup_probes();
    }
}

void print_thread_context(FILE *stream,struct target *target,tid_t tid,
              int ttctx,int ttdetail,int bt,int overlay_levels,
              char *overlay_debuginfo_prefix,char *sep,char *kvsep,
              char *tprefix,char *tsep) {
    struct target_thread *tthread;
    char buf[4096];
    struct array_list *tids;
    int i,j;
    int rc;
    int didmaintid = 0;
    tid_t ttid;
    struct target *overlay;
    struct array_list *otl;
    struct target_spec *ospec;

    if (ttctx == 0) 
    return;
    else if (ttctx == 1) {
    tids = array_list_create(1);
    array_list_append(tids,(void *)(uintptr_t)tid);
    }
    else if (ttctx == 2) {
    tids = array_list_create(8);
    /* Just walk up the parent hierarchy. */
    ttid = tid;
    while (1) {
        tthread = target_lookup_thread(target,ttid);
        if (!tthread)
        break;
        array_list_append(tids,(void *)(uintptr_t)ttid);
        ttid = tthread->ptid;
    }
    }
    else if (ttctx == 3) {
    tids = target_list_available_tids(target);
    /* Make sure selected tid is first; skip it later. */
    if (!tids)
        tids = array_list_create(1);
    array_list_prepend(tids,(void *)(uintptr_t)tid);
    }
    else
    return;

    array_list_foreach_fakeptr_t(tids,i,ttid,uintptr_t) {
    tthread = target_lookup_thread(target,ttid);
    if (!tthread)
        continue;

    if (tthread->tid == tid && didmaintid)
        continue;
    else if (tthread->tid == tid)
        didmaintid = 1;

    fprintf(stream,"%s",tsep);

    if (target_thread_snprintf(target,tthread->tid,buf,sizeof(buf),
                   ttdetail,sep,kvsep) < 0) 
        fprintf(stream,"%s[tid=%"PRIiTID"",tprefix,tthread->tid);
    else
        fprintf(stream,"%s[%s",tprefix,buf);

    if (bt) {
        rc = target_unwind_snprintf(buf,sizeof(buf),target,tthread->tid,
                    TARGET_UNWIND_STYLE_PROG_KEYS,"|",",");
        if (rc < 0)
        fprintf(stream,"%sbacktrace=[error!]",sep);
        else if (rc == 0)
        fprintf(stream,"%sbacktrace=[empty]",sep);
        else
        fprintf(stream,"%sbacktrace=[%s]",sep,buf);
    }

    fprintf(stream,"]");

    /*
     * Handle overlay levels!  Woot!
     */
    otl = array_list_create(8);
    overlay = target;
    ttid = tthread->tid;
    while (overlay_levels != 0) {
        ospec = target_build_default_overlay_spec(overlay,ttid);
        if (!ospec)
        break;

        if (overlay_debuginfo_prefix)
        ospec->debugfile_root_prefix = strdup(overlay_debuginfo_prefix);

        overlay = target_instantiate_overlay(overlay,ttid,ospec);
        if (!overlay)
        break;

        target_open(overlay);

        fprintf(stream,"%s",tsep);

        if (target_thread_snprintf(overlay,ttid,buf,sizeof(buf),
                       ttdetail,sep,kvsep) < 0) 
        fprintf(stream,"%s[overlay=%s%stid=%"PRIiTID"",
            tprefix,overlay->name,sep,ttid);
        else
        fprintf(stream,"%s[overlay=%s%s%s",
            tprefix,overlay->name,sep,buf);

        if (bt) {
        rc = target_unwind_snprintf(buf,sizeof(buf),overlay,ttid,
                        TARGET_UNWIND_STYLE_PROG_KEYS,
                        "|",",");
        if (rc < 0)
            fprintf(stream,"%sbacktrace=[error!]",sep);
        else if (rc == 0)
            fprintf(stream,"%sbacktrace=[empty]",sep);
        else
            fprintf(stream,"%sbacktrace=[%s]",sep,buf);
        }

        fprintf(stream,"]");

        --overlay_levels;

        array_list_prepend(otl,overlay);
    }

    array_list_foreach(otl,j,overlay) {
        target_close(overlay);
        target_finalize(overlay);
    }

    array_list_free(otl);
    otl = NULL;
    }

    array_list_free(tids);
}

void spf_backtrace(struct target *t,tid_t ctid,char *tiddesc,
           int overlay_levels,char *overlay_debuginfo_prefix) {
    struct array_list *tids;
    tid_t tid;
    int i;
    tid_t stid = -1;
    struct target_thread *tthread;
    char *endptr = NULL;
    int rc;
    char buf[4096];
    struct target *overlay;
    struct array_list *otl;
    struct target_spec *ospec;

    if (tiddesc) {
    stid = (int)strtol(tiddesc,&endptr,10);
    if (tiddesc == endptr) 
        stid = -1;
    else
        tiddesc = NULL;
    }
    else 
    stid = -1;

    /*
     * If stid == 0 or tiddesc, do them all.
     *
     * If it == -1 && !tiddesc, do ctid.
     *
     * If it >= 0, do that one.
     */

    if (stid == -1 && !tiddesc) {
    tids = array_list_create(1);
    array_list_append(tids,(void *)(uintptr_t)ctid);
    
    printf("Backtracing target '%s' (current thread %d):\n\n",t->name,ctid);
    }
    else if (stid > 0) {
    tids = array_list_create(1);
    array_list_append(tids,(void *)(uintptr_t)stid);
    
    printf("Backtracing target '%s' (thread %d):\n\n",t->name,stid);
    }
    else if (tiddesc) {
    tids = target_list_tids(t);
    
    printf("Backtracing target '%s' (thread name %s):\n\n",t->name,tiddesc);
    }
    else {
    tids = target_list_tids(t);
    
    printf("Backtracing target '%s' (all threads):\n\n",t->name);
    }

    array_list_foreach_fakeptr_t(tids,i,tid,uintptr_t) {
    tthread = target_lookup_thread(t,tid);
    if (!tthread)
        continue;

    if ((tiddesc && !tthread->name)
        || (tiddesc && strcmp(tiddesc,tthread->name)))
        continue;

    rc = target_unwind_snprintf(buf,sizeof(buf),t,tid,
                    TARGET_UNWIND_STYLE_GDB,"\n",",");
    if (rc < 0)
        fprintf(stdout,"\ntarget %s thread %"PRIiTID": (error!)\n",
            t->name,tid);
    else if (rc == 0)
        fprintf(stdout,"\ntarget %s thread %"PRIiTID": (nothing)\n",
            t->name,tid);
    else
        fprintf(stdout,"\ntarget %s thread %"PRIiTID": \n%s\n",
            t->name,tid,buf);

    if (overlay_levels == 0)
        continue;

    /*
     * Handle overlay levels!
     */
    otl = array_list_create(8);
    overlay = t;
    while (overlay_levels != 0) {
        ospec = target_build_default_overlay_spec(overlay,tid);
        if (!ospec)
        break;

        if (overlay_debuginfo_prefix)
        ospec->debugfile_root_prefix = strdup(overlay_debuginfo_prefix);

        overlay = target_instantiate_overlay(overlay,tid,ospec);
        if (!overlay)
        break;

        target_open(overlay);

        rc = target_unwind_snprintf(buf,sizeof(buf),overlay,tid,
                    TARGET_UNWIND_STYLE_GDB,"\n",",");
        if (rc < 0)
        fprintf(stdout,"\ntarget %s thread %"PRIiTID": (error!)\n",
            overlay->name,tid);
        else if (rc == 0)
        fprintf(stdout,"\ntarget %s thread %"PRIiTID": (nothing)\n",
            overlay->name,tid);
        else
        fprintf(stdout,"\ntarget %s thread %"PRIiTID": \n%s\n",
            overlay->name,tid,buf);

        --overlay_levels;

        array_list_prepend(otl,overlay);
    }

    array_list_foreach(otl,i,overlay) {
        target_close(overlay);
        target_finalize(overlay);
    }

    array_list_free(otl);
    otl = NULL;
    }

    fputs("\n",stdout);
    fflush(stdout);
}

int spf_signal(struct target *t,tid_t ctid,char *tiddesc,char *sigdesc) {
    struct array_list *tids;
    tid_t tid;
    int i;
    tid_t stid = -1;
    struct target_thread *tthread;
    char *endptr = NULL;
    int rc;
    int signo;

    signo = target_os_signal_from_name(t,sigdesc);

    if (tiddesc) {
    stid = (int)strtol(tiddesc,&endptr,10);
    if (tiddesc == endptr) 
        stid = -1;
    else
        tiddesc = NULL;
    }
    else 
    stid = -1;

    /*
     * If stid == 0 or tiddesc, do them all.
     *
     * If it == -1 && !tiddesc, do ctid.
     *
     * If it >= 0, do that one.
     */

    if (stid == -1 && !tiddesc) {
    tids = array_list_create(1);
    array_list_append(tids,(void *)(uintptr_t)ctid);
    
    printf("Signaling target '%s' (current thread %d):\n\n",t->name,ctid);
    }
    else if (stid > 0) {
    tids = array_list_create(1);
    array_list_append(tids,(void *)(uintptr_t)stid);
    
    printf("Signaling target '%s' (thread %d):\n\n",t->name,stid);
    }
    else if (tiddesc) {
    tids = target_list_tids(t);
    
    printf("Signaling target '%s' (thread name %s):\n\n",t->name,tiddesc);
    }
    else {
    tids = target_list_tids(t);
    
    printf("Signaling target '%s' (all threads):\n\n",t->name);
    }

    array_list_foreach_fakeptr_t(tids,i,tid,uintptr_t) {
    tthread = target_lookup_thread(t,tid);
    if (!tthread)
        continue;

    if ((tiddesc && !tthread->name)
        || (tiddesc && strcmp(tiddesc,tthread->name)))
        continue;

    rc = target_os_signal_enqueue(t,tid,signo,NULL);
    if (rc < 0)
        fprintf(stdout,"thread %"PRIiTID": (error!)\n",tid);
    else if (rc == 0)
        fprintf(stdout,"thread %"PRIiTID": success\n",tid);
    else
        fprintf(stdout,"thread %"PRIiTID": unknown status %d\n",tid,rc);
    }

    fflush(stdout);

    return 0;
}

result_t handler(int when,struct probe *probe,tid_t tid,void *data,
         struct probe *trigger,struct probe *base) {
    GHashTableIter iter;
    gpointer kp,vp;
    char vstrbuf[1024];
    struct value *v;
    GHashTable *vt;
    struct bsymbol *bsymbol;
    struct symbol *symbol;
    int i,j;
    int rc;
    struct spf_filter *spff = (struct spf_filter *)data;
    GSList *gsltmp;
    struct spf_action *spfa;
    struct probe *fprobe;
    result_t retval = RESULT_SUCCESS;
    struct target *btt,*st;

    /*
     * Do all the actions.
     */
    v_g_slist_foreach(spff->actions,gsltmp,spfa) {
    if (spfa->atype == SPF_ACTION_ABORT) {
        /*
         * Action has to be registered on the base probe!!
         */
        struct action *action = action_return(spfa->abort.retval);
        if (!action) {
        verror("probe %s: could not create action on probe %s !\n",
               probe_name(probe),probe_name(base));
        }
        else if (action_sched(base,action,ACTION_ONESHOT,NULL,NULL)) {
        verror("probe %s: could not schedule action on probe %s!\n",
               probe_name(probe),probe_name(base));
        action_release(action);
        }
        else {
        vdebug(5,LA_USER,LF_U_PROBE,
               "probe %s: scheduled return action on probe %s\n",
               probe_name(probe),probe_name(base));
        action_release(action);
        }
    }
    else if (spfa->atype == SPF_ACTION_ENABLE) {
        /* Check if it's us.  No need to waste a hashtable lookup. */
        if (strcmp(spfa->enable.id,probe_name(probe)) == 0) 
        fprobe = probe;
        else 
        fprobe = (struct probe *)               \
            g_hash_table_lookup(fprobes,spfa->enable.id);
        if (!fprobe) {
        vwarn("probe %s: cannot enable nonexisting filter probe %s!\n",
              probe_name(probe),spfa->enable.id);
        }
        else {
        probe_enable(fprobe);
        vdebug(5,LA_USER,LF_U_PROBE,
               "probe %s: enabled filter probe %s\n",
               probe_name(probe),spfa->enable.id);
        }
    }
    else if (spfa->atype == SPF_ACTION_DISABLE) {
        /* Check if it's us.  No need to waste a hashtable lookup. */
        if (strcmp(spfa->disable.id,probe_name(probe)) == 0) 
        fprobe = probe;
        else 
        fprobe = (struct probe *) \
            g_hash_table_lookup(fprobes,spfa->disable.id);
        if (!fprobe) {
        vwarn("probe %s: cannot enable nonexisting filter probe %s!\n",
              probe_name(probe),spfa->disable.id);
        }
        else {
        probe_disable(fprobe);
        vdebug(5,LA_USER,LF_U_PROBE,"probe %s: disabled probe %s\n",
               probe_name(probe),spfa->disable.id);
        }
    }
    else if (spfa->atype == SPF_ACTION_REMOVE) {
        /* Check if it's us -- to remove self we have to return special! */
        if (strcmp(spfa->remove.id,probe_name(probe)) == 0) {
        vdebug(5,LA_USER,LF_U_PROBE,"probe %s: removing self!\n",
               probe_name(probe));
        retval = RESULT_ABORT;
        }
        else { 
        fprobe = (struct probe *) \
            g_hash_table_lookup(fprobes,spfa->remove.id);
        if (!fprobe) {
            vwarn("probe %s: cannot remove nonexisting filter probe %s!\n",
              probe_name(probe),spfa->remove.id);
        }
        else {
            probe_free(fprobe,0);
            vdebug(5,LA_USER,LF_U_PROBE,"probe %s: removed probe %s\n",
               probe_name(probe),spfa->remove.id);
        }
        }
    }
    else if (spfa->atype == SPF_ACTION_EXIT) {
        /*
         * Have to schedule a monitor interrupt to exit!
         */
        if (spfa->exit.retval == -69) {
        cleanup_probes();
        exit(-69);
        }

        /*
         * We don't need to actually interrupt the monitor, though,
         * because we're in a handler -- so some driver is handling
         * us.
         */
        target_monitor_schedule_global_interrupt();
        needtodie = 1;
        needtodie_exitcode = spfa->exit.retval;
        vdebug(5,LA_USER,LF_U_PROBE,"probe %s: scheduled exit with %d!\n",
           probe_name(probe),spfa->exit.retval);
    }
    else if (spfa->atype == SPF_ACTION_REPORT) {
        ++result_counter;

        bsymbol = probe->bsymbol;
        symbol = bsymbol_get_symbol(bsymbol);

        vt = probe_value_get_table(trigger,tid);
        if (!vt) {
        vwarn("probe %s: could not get values from probe %s"
              " (tid %"PRIiTID")!\n",
              probe_name(probe),probe_name(trigger),tid);
        }

        fflush(stderr);
        fflush(stdout);

        fprintf(stdout,"RESULT:: (%c:%d) %s (%d) %s %s (",
            spfa->report.rt,result_counter,
            spfa->report.tn ? spfa->report.tn : "",
            spfa->report.tid,spfa->report.rv ? spfa->report.rv : "",
            spfa->report.msg ? spfa->report.msg : "\"\"");
        /* Now print the values... */
        if (vt) {
        i = 0;
        g_hash_table_iter_init(&iter,vt);
        while (g_hash_table_iter_next(&iter,&kp,&vp)) {
            if (i > 0)
            fprintf(stdout,",");
            v = (struct value *)vp;
            if (v) {
            rc = value_snprintf(v,vstrbuf,sizeof(vstrbuf));
            if (rc > 0) {
                int unprintable = 0;
                for (j = 0; vstrbuf[j] != '\0'; ++j) {
                if (!isgraph(vstrbuf[j]) && !isspace(vstrbuf[j])) {
                    unprintable = 1;
                    break;
                }
                }

                if (unprintable) {
                vwarn("unprintable raw value for key %s = 0x",
                      (char *)kp);
                for (j = 0; vstrbuf[j] != '\0'; ++j) {
                    vwarnc("%hhx",vstrbuf[j]);
                }
                vwarnc("\n");

                fprintf(stdout,"%s=??",(char *)kp);
                }
                else {
                fprintf(stdout,"%s=%s",(char *)kp,vstrbuf);
                }
            }
            else
                fprintf(stdout,"%s=?",(char *)kp);
            }
            else
            fprintf(stdout,"%s=?",(char *)kp);
            ++i;
        }
        }
        fputs(",",stdout);
        print_thread_context(stdout,bsymbol->region->space->target,tid,
                 spfa->report.ttctx,spfa->report.ttdetail,
                 spfa->report.bt,spfa->report.overlay_levels,
                 spfa->report.overlay_debuginfo_prefix,
                 ";",":","thread=",",");
        fprintf(stdout,") ::RESULT\n");
        fflush(stdout);
    }
    else if (spfa->atype == SPF_ACTION_PRINT) {
        bsymbol = probe->bsymbol;
        symbol = bsymbol_get_symbol(bsymbol);

        vt = probe_value_get_table(trigger,tid);
        if (!vt) {
        vwarn("probe %s: could not get values from probe %s"
              " (tid %"PRIiTID")!\n",
              probe_name(probe),probe_name(trigger),tid);
        }

        fflush(stderr);
        fflush(stdout);

        if (symbol_type_flags_match(symbol,SYMBOL_TYPE_FLAG_FUNC))
        fprintf(stdout,"%s (",symbol_get_name(symbol));
        if (vt) {
        i = 0;
        g_hash_table_iter_init(&iter,vt);
        while (g_hash_table_iter_next(&iter,&kp,&vp)) {
            if (strcmp((char *)kp,PROBE_VALUE_NAME_RETURN) == 0)
            continue;
            if (i > 0)
            fprintf(stdout,",");
            v = (struct value *)vp;
            if (v) {
            rc = value_snprintf(v,vstrbuf,sizeof(vstrbuf));
            if (rc > 0)
                fprintf(stdout,"%s = %s",(char *)kp,vstrbuf);
            else
                fprintf(stdout,"%s = ?",(char *)kp);
            }
            else
            fprintf(stdout,"%s = ?",(char *)kp);
            ++i;
        }
        }
        else {
        if (symbol_type_flags_match(symbol,SYMBOL_TYPE_FLAG_FUNC))
            fprintf(stdout,"?");
        else
            fprintf(stdout," = ?");
        }
        if (symbol_type_flags_match(symbol,SYMBOL_TYPE_FLAG_FUNC)) {
        fprintf(stdout,")");
        if (vt) {
            v = (struct value *) \
            g_hash_table_lookup(vt,PROBE_VALUE_NAME_RETURN);
            if (v) {
            rc = value_snprintf(v,vstrbuf,sizeof(vstrbuf));
            if (rc > 0)
                fprintf(stdout," = %s",vstrbuf);
            else
                fprintf(stdout," = ?");
            }
        }
        }
        fputs(" ",stdout);
        print_thread_context(stdout,bsymbol->region->space->target,tid,
                 spfa->print.ttctx,spfa->print.ttdetail,
                 0,0,NULL,NULL,NULL,"",",");
        fputs("\n",stdout);
        fflush(stdout);
    }
    else if (spfa->atype == SPF_ACTION_BT) {
        if (spfa->bt.tid > 1) {
        btt = target_lookup_target_id(spfa->bt.tid);
        if (!btt) {
            verror("no existing target with id '%d'!\n",spfa->bt.tid);
            return RESULT_SUCCESS;
        }
        }
        else
        btt = probe->target;

        spf_backtrace(btt,tid,spfa->bt.thid,spfa->bt.overlay_levels,
              spfa->bt.overlay_debuginfo_prefix);
    }
    else if (spfa->atype == SPF_ACTION_SIGNAL) {
        if (spfa->signal.tid > 1) {
        st = target_lookup_target_id(spfa->signal.tid);
        if (!st) {
            verror("no existing target with id '%d'!\n",
               spfa->signal.tid);
            return RESULT_SUCCESS;
        }
        }
        else
        st = probe->target;

        spf_signal(st,tid,spfa->signal.thid,spfa->signal.sigdesc);
    }
    else {
        verror("probe %s: bad action type %d -- BUG!\n",
           probe_name(probe),spfa->atype);
    }
    }

    return retval;
}

result_t pre_handler(struct probe *probe,tid_t tid,void *data,
             struct probe *trigger,struct probe *base) {
    return handler(WHEN_PRE,probe,tid,data,trigger,base);
}

result_t post_handler(struct probe *probe,tid_t tid,void *data,
              struct probe *trigger,struct probe *base) {
    return handler(WHEN_POST,probe,tid,data,trigger,base);
}

/*
 * This just makes sure values get loaded at the appropriate phases of
 * the value probes so they are always available even if the probe is
 * pre/post.
 */
result_t null_handler(struct probe *probe,tid_t tid,void *data,
              struct probe *trigger,struct probe *base) {
    probe_value_get_table(trigger,tid);
    return RESULT_SUCCESS;
}

#define __TARGET_OVERLAY      0x200000
#define SPF_CONFIGFILE_FATAL  0x200001
#define SPF_OS_SYSCALL_PROBES 0x200002

struct argp_option spf_argp_opts[] = {
    { "overlay",__TARGET_OVERLAY,"[<target_id>:]<thread_name_or_id>:<spec_opts>",0,"Lookup name or id as an overlay target once the main target is instantiated, and try to open it.  All dumptarget options then apply to the overlay.",0 },
    { "config-file",'C',"<FILE>",0,"An SPF config file.",0 },
    { "config-file-fatal",SPF_CONFIGFILE_FATAL,NULL,0,
      "Make errors while applying runtime updates (via USR2) to the config file fatal.",0 },
    { "use-os-syscall-probes",SPF_OS_SYSCALL_PROBES,NULL,0,
      "Try to use target_os_syscall probes if symbol is a syscall and target is an OS.",0 },
    { 0,0,0,0,0,0 },
};

error_t spf_argp_parse_opt(int key,char *arg,struct argp_state *state) {
    struct spf_argp_state *opts = \
    (struct spf_argp_state *)target_argp_driver_state(state);

    switch (key) {
    case ARGP_KEY_ARG:
    return ARGP_ERR_UNKNOWN;
    case ARGP_KEY_ARGS:
    /* Eat all the remaining args. */
    if (state->quoted > 0)
        opts->argc = state->quoted - state->next;
    else
        opts->argc = state->argc - state->next;
    if (opts->argc > 0) {
        opts->argv = calloc(opts->argc,sizeof(char *));
        memcpy(opts->argv,&state->argv[state->next],opts->argc*sizeof(char *));
        state->next += opts->argc;
    }
    return 0;
    case ARGP_KEY_INIT:
    target_driver_argp_init_children(state);
    return 0;
    case ARGP_KEY_END:
    case ARGP_KEY_NO_ARGS:
    case ARGP_KEY_SUCCESS:
    return 0;
    case ARGP_KEY_ERROR:
    case ARGP_KEY_FINI:
    return 0;
    case SPF_CONFIGFILE_FATAL:
    opts->config_file_fatal = 1;
    break;
    case SPF_OS_SYSCALL_PROBES:
    opts->use_os_syscall_probes = 1;
    break;
    case 'C':
    opts->config_file = arg;
    break;

    default:
    return ARGP_ERR_UNKNOWN;
    }

    return 0;
}

struct argp spf_argp = {
    spf_argp_opts,spf_argp_parse_opt,NULL,NULL,NULL,NULL,NULL,
};

int main(int argc,char **argv) {
    int i;
    struct bsymbol *bsymbol;
    struct probe *sprobe, *fprobe;
    char *name, *context;
    char *str;
    char namebuf[128];
    struct target_nv_filter *pre_pf, *post_pf;
    char *pre_filter, *post_filter;
    struct target_os_syscall *syscall;

    struct target_spec *primary_target_spec = NULL;
    GList *base_target_specs = NULL;
    GList *overlay_target_specs = NULL;
    struct target *target;
    int rc;
    struct evloop *evloop;
    GList *t1;

    target_init();
    atexit(target_fini);

    /*
     * We need to handle SIGUSR1, SIGUSR2, and SIGHUP specially so we
     * can reload our config file as necessary.
     */
    sigemptyset(&ignored);
    sigemptyset(&exitset);
    sigemptyset(&interrupt);

    sigaddset(&exitset,SIGINT);
    sigaddset(&exitset,SIGALRM);
    sigaddset(&exitset,SIGQUIT);
    sigaddset(&exitset,SIGILL);
    sigaddset(&exitset,SIGABRT);
    sigaddset(&exitset,SIGFPE);
    sigaddset(&exitset,SIGSEGV);
    sigaddset(&exitset,SIGPIPE);
    sigaddset(&exitset,SIGTERM);
    sigaddset(&exitset,SIGBUS);
    sigaddset(&exitset,SIGXCPU);
    sigaddset(&exitset,SIGXFSZ);

    sigaddset(&interrupt,SIGUSR1);
    sigaddset(&interrupt,SIGUSR2);
    sigaddset(&interrupt,SIGHUP);

    target_install_custom_sighandlers(&ignored,&interrupt,&exitset,
                      sigh_cleanup_probes);

    memset(&opts,0,sizeof(opts));
    rc = target_argp_driver_parse(&spf_argp,&opts,argc,argv,
                  TARGET_TYPE_PTRACE 
                      | TARGET_TYPE_XEN | TARGET_TYPE_GDB,1,
                  &primary_target_spec,&base_target_specs,
                  &overlay_target_specs);

    if (rc) {
    verror("could not parse target arguments!\n");
    exit(-1);
    }

    if (opts.config_file) {
    config = load_config_file(opts.config_file);
    if (!config) {
        verror("could not read config file %s!\n",opts.config_file);
        exit(-11);
    }
    }

    evloop = evloop_create(NULL);

    targets = target_instantiate_and_open(primary_target_spec,
                      base_target_specs,overlay_target_specs,
                      evloop,NULL);
    if (!targets) {
    verror("could not instantiate and open targets!\n");
    exit(-1);
    }

    /*
     * Setup probes from command line or load config file.
     */
    sprobes = g_hash_table_new(g_direct_hash,g_direct_equal);
    fprobes = g_hash_table_new(g_direct_hash,g_direct_equal);

    if (opts.use_os_syscall_probes) {
    v_g_list_foreach(targets,t1,target) {
        if (target->personality != TARGET_PERSONALITY_OS)
        continue;

        if (target_os_syscall_table_load(target))
        vwarn("could not load the syscall table for target %s;"
              " target_os_syscall probes will not be available!\n",
              target->name);
    }
    }

    if (opts.argc > 0) {
    for (i = 0; i < opts.argc; ++i) {
        pre_filter = post_filter = context = NULL;
        name = str = opts.argv[i];
        while (*str != '\0') {
        if (*str == ':' && *(str+1) == ':') {
            *str = '\0';
            str += 2;
            break;
        }
        ++str;
        }
        if (*str != '\0') {
        if (*str == ':')
            pre_filter = NULL;
        else
            pre_filter = str;
        }
        while (*str != '\0') {
        if (*str == ':' && *(str+1) == ':') {
            *str = '\0';
            str += 2;
            break;
        }
        ++str;
        }
        if (*str != '\0') {
        if (*str == ':')
            post_filter = NULL;
        else
            post_filter = str;
        }
        while (*str != '\0') {
        if (*str == ':' && *(str+1) == ':') {
            *str = '\0';
            str += 2;
            break;
        }
        ++str;
        }
        if (*str != '\0')
        context = str;

        sprobe = (struct probe *)g_hash_table_lookup(sprobes,name);
        if (!sprobe) {
        /*
         * Create a probe on that symbol:
         */

        bsymbol = NULL;
        v_g_list_foreach(targets,t1,target) {
            if (opts.use_os_syscall_probes
            && target->personality == TARGET_PERSONALITY_OS)
            syscall = target_os_syscall_lookup_name(target,name);
            else
            syscall = NULL;
            if (syscall) {
            sprobe = \
			    target_os_syscall_probe(target,TID_GLOBAL,syscall,
                            probe_do_sink_pre_handlers,
                            probe_do_sink_post_handlers,
                            NULL);
            if (!sprobe) {
                verror("could not place syscall value probe on %s;"
                   " aborting!\n",name);
                rc = -5;
                goto exit;
            }
            else
                break;
            }
            else {
            bsymbol = target_lookup_sym(target,name,NULL,NULL,
                            SYMBOL_TYPE_FLAG_NONE);
            if (!bsymbol)
                continue;

            sprobe =
                probe_value_symbol(bsymbol->region->space->target,
                           TID_GLOBAL,bsymbol,
                           probe_do_sink_pre_handlers,
                           probe_do_sink_post_handlers,
                           NULL);
            if (!sprobe) {
                verror("could not place value probe on %s;"
                   " aborting!\n",name);
                rc = -3;
                goto exit;
            }
            else
                break;
            }
        }

        if (!sprobe) {
            verror("could not probe symbol %s; aborting!\n",name);
            rc = -3;
            goto exit;
        }
        else
            g_hash_table_insert(sprobes,name,sprobe);
        }

        /* Create either an empty filter probe or parse the filter! */
        if (pre_filter) {
        pre_pf = target_nv_filter_parse(pre_filter);
        if (!pre_pf) {
            verror("could not parse pre_filter '%s'!\n",pre_filter);
            rc = -4;
            goto exit;
        }
        }
        else 
        pre_pf = NULL;
        if (post_filter) {
        post_pf = target_nv_filter_parse(post_filter);
        if (!post_pf) {
            verror("could not parse post_filter '%s'!\n",post_filter);
            rc = -4;
            goto exit;
        }
        }
        else 
        post_pf = NULL;

        snprintf(namebuf,sizeof(namebuf),"filter_%s_%d",name,i);
        fprobe = probe_create_filtered(sprobe->target,TID_GLOBAL,NULL,namebuf,
                       pre_handler,pre_pf,
                       post_handler,post_pf,NULL,NULL,0,1);

        probe_register_source(fprobe,sprobe);

        g_hash_table_insert(fprobes,namebuf,fprobe);
    }
    }
    else if (!opts.config_file) {
    /* Try the default config file. */
    if (access("spf.conf",R_OK)) {
        verror("Must supply some symbols to probe!\n");
        rc = -5;
        goto exit;
    }
    else {
        opts.config_file = strdup("spf.conf");
        
        config = load_config_file(opts.config_file);
        if (!config) {
        verror("could not read default config file %s!\n",
               opts.config_file);
        rc = -11;
        goto exit;
        }
    }
    }

    /* Now apply the config file.  Always make the first application fatal. */
    int oldfatal = opts.config_file_fatal;
    opts.config_file_fatal = 1;
    if (apply_config_file(config)) {
    verror("could not install config file %s!\n",opts.config_file);
    rc = -12;
    goto exit;
    }
    opts.config_file_fatal = oldfatal;

    if (g_hash_table_size(sprobes) == 0) {
    verror("No symbols to probe; exiting!\n");
    rc = -1;
    goto exit;
    }

    /*
     * The targets were paused after instantiation; we have to resume them
     * now that we've registered probes.
     */
    v_g_list_foreach(targets,t1,target) {
    target_resume(target);
    }

    fprintf(stdout,"Starting Symbol Probe Filtering!\n");
    fflush(stdout);

    fprintf(stdout,"Starting thread watch loop!\n");
    fflush(stdout);

    while (1) {
    tid_t tid = 0;
    struct target *t;
    target_status_t tstat;
    char *tname;
    siginfo_t siginfo;

    rc = target_monitor_evloop(evloop,NULL,&t,&tstat);

    /*
     * Did we get interrupted safely?  We need to check if we were
     * told to either die, or if we need to reload the config file.
     */
    if (target_monitor_was_interrupted(&siginfo)) {
        if (needtodie) {
        rc = 0;
        goto exit;
        }
        else if (siginfo.si_signo == SIGUSR1
             || siginfo.si_signo == SIGUSR2
             || siginfo.si_signo == SIGHUP) {
        reload_config_file();
        }

        target_monitor_clear_global_interrupt();

        v_g_list_foreach(targets,t1,target) {
        target_resume(target);
        }
    }
    /* Did we experience an error in select() or in evloop? */
    else if (rc < 0) {
        fprintf(stderr,"error in target_monitor_evloop (%d): %s; aborting!\n",
            rc,strerror(errno));
        rc = -3;
        goto exit;
    }
    /* Did we experience a significant event on a target? */
    else if (rc == 0 && evloop_maxsize(evloop) < 0) {
        break;
    }
    else if (rc == 0) {
        tid = target_gettid(t);
        tname = target_name(t);

        if (tstat == TSTATUS_ERROR) {
        fprintf(stderr,
            "Error handling target '%s'; closing and finalizing!\n",
            tname);

        target_close(t);
        target_finalize(t);
        targets = g_list_remove(targets,t);
        }
        else if (tstat == TSTATUS_DONE) {
        fprintf(stderr,
            "Target '%s' finished; finalizing!\n",
            tname);

        target_close(t);
        target_finalize(t);
        targets = g_list_remove(targets,t);
        }
        else if (tstat == TSTATUS_EXITING) {
        fprintf(stderr,"Target '%s' exiting...\n",tname);
        }
        else if (tstat == TSTATUS_INTERRUPTED) {
        fprintf(stderr,"Target '%s' interrupted, resuming...\n",tname);
        if (target_resume(t)) {
            fprintf(stderr,"Could not resume target %s tid %"PRIiTID"\n",
            tname,tid);

            target_close(t);
            target_finalize(t);
            targets = g_list_remove(targets,t);
        }
        }
        else {
        fprintf(stderr,
            "Target '%s' tid %d received unexpected status '%s'"
            " at 0x%"PRIxADDR"; attempting to continue!\n",
            tname,tid,TSTATUS(tstat),target_read_reg(t,tid,CREG_IP));
        if (target_resume(t)) {
            fprintf(stderr,"Could not resume target %s tid %"PRIiTID"\n",
            tname,tid);

            target_close(t);
            target_finalize(t);
            targets = g_list_remove(targets,t);
        }
        }
    }
    }

    rc = 0;

 exit:
    fflush(stderr);
    fflush(stdout);
    cleanup_probes();
    target_default_cleanup();
    if (rc < 0)
    exit(rc);
    else
    exit(needtodie_exitcode);
}

void spf_action_free(struct spf_action *spfa) {
    if (spfa->atype == SPF_ACTION_REPORT) {
    if (spfa->report.tn)
        free(spfa->report.tn);
    if (spfa->report.rv)
        free(spfa->report.rv);
    if (spfa->report.msg)
        free(spfa->report.msg);
    }
    else if (spfa->atype == SPF_ACTION_ENABLE) {
    if (spfa->enable.id)
        free(spfa->enable.id);
    }
    else if (spfa->atype == SPF_ACTION_DISABLE) {
    if (spfa->disable.id)
        free(spfa->disable.id);
    }
    else if (spfa->atype == SPF_ACTION_REMOVE) {
    if (spfa->remove.id)
        free(spfa->remove.id);
    }

    free(spfa);
}

void spf_filter_free(struct spf_filter *spff) {
    GSList *gsltmp;
    struct spf_action *spfa;

    if (spff->id)
    free(spff->id);
    if (spff->symbol)
    free(spff->symbol);
    if (spff->bsymbol)
    bsymbol_release(spff->bsymbol);
    if (spff->pf)
    target_nv_filter_free(spff->pf);
    if (spff->actions) {
    v_g_slist_foreach(spff->actions,gsltmp,spfa) {
        spf_action_free(spfa);
    }
    g_slist_free(spff->actions);
    }

    free(spff);
}

void spf_config_free(struct spf_config *config) {
    GSList *gsltmp;
    struct spf_filter *spff;

    v_g_slist_foreach(config->spf_filter_list,gsltmp,spff) {
    spf_filter_free(spff);
    }
    g_slist_free(config->spf_filter_list);
}

/*
 * Language is like this.  Single lines of probe filters/actions.
 *
 *   [ see README.spf.txt ]
 *
 * Reports interpreted by the XML server like this:
 *
 *   "RESULT:: (%c:%d) %ms (%d) %ms \"%m[^\"]\" (%m[^)]) ::RESULT\n",
 *   &rt,&id,&name,&type,&result_value,&msg,&value_str);
 *
 *   rt=(i|f) id=<unique_int> typename typeid result_value "msg" (<meta_kv_pairs>)
 *
 * We often use result_value as a msg subtype field within typename/typeid.
 */

char *_get_next_non_enc_esc(char *s,int c) {
    int wasesc = 0;
    int isesc = 0;
    int isenc = 0;
    int encchar;
    
    while (*s != '\0') {
    wasesc = isesc;
    isesc = 0;
    if (isenc) {
        if (*s == '\\') {
        if (!wasesc) 
            isesc = 1;
        }
        else if (*s == encchar && !wasesc) {
        encchar = '\0';
        isenc = 0;
        }
    }
    else if (*s == c) {
        if (!wasesc)
        break;
    }
    else if (*s == '\\') {
        if (!wasesc)
        isesc = 1;
    }

    ++s;
    }

    if (*s == c)
    return s;
    else
    return NULL;
}

void reload_config_file(void) {
    struct spf_config *newconfig;

    newconfig = load_config_file(opts.config_file);
    if (!newconfig) {
    if (opts.config_file_fatal) {
        verror("could not reread config file %s!\n",opts.config_file);
        cleanup_probes();
        target_default_cleanup();
        exit(-1);
    }
    else {
        vwarn("could not reread config file %s; leaving"
          " existing configuration in place!\n",opts.config_file);
    }
    }
    else {
    apply_config_file(newconfig);
    //spf_config_free(config);
    config = newconfig;
    newconfig = NULL;
    }
}

/*
 * Applies the config file.
 *
 * The easiest thing to do is remove all the filter probes; then see
 * which symbol probes we need to add/remove; then re-add all the
 * filter probes.
 *
 * What happens if we get called while one of our filter probes is
 * running its handler (or the list the probe is on is getting
 * iterated)?
 *
 * Sigh... we're going to have to add this aren't we.  probe_free() will
 * have to schedule a free if the probe is in use...
 */
int apply_config_file(struct spf_config *config) {
    GSList *gsltmp;
    struct spf_filter *spff;
    struct bsymbol *bsymbol = NULL;
    GHashTable *needed = NULL;
    GHashTableIter iter;
    gpointer kp,vp;
    struct probe *probe,*sprobe,*fprobe;
    char namebuf[128];
    int i;
    struct target_os_syscall *syscall;
    GList *t1;
    struct target *target;

    /* First, destroy all the filter probes. */
    g_hash_table_iter_init(&iter,fprobes);
    while (g_hash_table_iter_next(&iter,&kp,&vp)) {
    probe = (struct probe *)vp;
    probe_free(probe,0);
    g_hash_table_iter_remove(&iter);
    }

    /* Second, build symbol probes for all the probes in the config. */
    needed = g_hash_table_new(g_str_hash,g_str_equal);
    v_g_slist_foreach(config->spf_filter_list,gsltmp,spff) {
    g_hash_table_insert(needed,spff->symbol,NULL);

    if (g_hash_table_lookup(sprobes,spff->symbol))
        continue;

    /* Create it. */
    bsymbol = NULL;
    v_g_list_foreach(targets,t1,target) {
        bsymbol = target_lookup_sym(target,spff->symbol,NULL,spff->srcfile,
                    SYMBOL_TYPE_FLAG_NONE);
        if (bsymbol)
        break;
    }

    if (!bsymbol) 
        bsymbol = target_lookup_sym(target,spff->symbol,NULL,spff->srcfile,
                    SYMBOL_TYPE_FLAG_NONE);

    if (!bsymbol) {
        if (opts.config_file_fatal) {
        verror("could not lookup symbol %s; aborting!\n",
               spff->symbol);
        cleanup_probes();
        target_default_cleanup();
        exit(-3);
        }
        else {
        vwarn("could not lookup symbol %s; skipping filter!\n",
              spff->symbol);
        continue;
        }
    }

    sprobe = NULL;
    if (opts.use_os_syscall_probes) {
        v_g_list_foreach(targets,t1,target) {
        if (target->personality != TARGET_PERSONALITY_OS)
            continue;

        syscall = target_os_syscall_lookup_name(target,spff->symbol);
        if (syscall) {
            sprobe = target_os_syscall_probe(target,TID_GLOBAL,syscall,
                             probe_do_sink_pre_handlers,
                             probe_do_sink_post_handlers,
                             NULL);
            if (!sprobe) {
            if (opts.config_file_fatal) {
                verror("could not place syscall value probe on %s;"
                   " aborting!\n",
                   spff->symbol);
                cleanup_probes();
                target_default_cleanup();
                exit(-3);
            }
            else {
                vwarn("could not place syscall value probe on %s;"
                  " skipping filter!\n",
                  spff->symbol);
                continue;
            }
            }
        }
        }
    }

    if (!sprobe) {
        sprobe = probe_value_symbol(bsymbol->region->space->target,
                    TID_GLOBAL,bsymbol,
                    probe_do_sink_pre_handlers,
                    probe_do_sink_post_handlers,NULL);
        if (!sprobe) {
        if (opts.config_file_fatal) {
            verror("could not place value probe on %s; aborting!\n",
               spff->symbol);
            cleanup_probes();
            target_default_cleanup();
            exit(-3);
        }
        else {
            vwarn("could not place value probe on %s; skipping filter!\n",
              spff->symbol);
            continue;
        }
        }
    }

    g_hash_table_insert(sprobes,spff->symbol,sprobe);
    }

    /* Third, any sprobe that is *NOT* in needed should be removed. */
    g_hash_table_iter_init(&iter,sprobes);
    while (g_hash_table_iter_next(&iter,&kp,&vp)) {
    if (g_hash_table_lookup_extended(needed,kp,NULL,NULL) == FALSE) {
        probe_free((struct probe *)vp,0);
        g_hash_table_iter_remove(&iter);
    }
    }
    g_hash_table_destroy(needed);
    needed = NULL;

    /* Finally, add all the filter probes. */
    v_g_slist_foreach(config->spf_filter_list,gsltmp,spff) {
    /* Again, if we failed for any reason to get the symbol, skip here. */
    sprobe = (struct probe *)g_hash_table_lookup(sprobes,spff->symbol);
    if (!sprobe)
        continue;
    if (!spff->id) {
        snprintf(namebuf,sizeof(namebuf),"filter_%s_%d",spff->symbol,i);
        spff->id = strdup(namebuf);
    }
    if (spff->when == WHEN_PRE)
        fprobe = probe_create_filtered(sprobe->target,TID_GLOBAL,NULL,spff->id,
                       pre_handler,spff->pf,null_handler,NULL,
                       spff->ttf,spff,0,1);
    else
        fprobe = probe_create_filtered(sprobe->target,TID_GLOBAL,NULL,spff->id,
                       null_handler,NULL,post_handler,spff->pf,
                       spff->ttf,spff,0,1);
    probe_register_source(fprobe,sprobe);

    if (spff->disable)
        probe_disable(fprobe);

    g_hash_table_insert(fprobes,spff->id,fprobe);
    }

    return 0;
}

/*
 * (Re)reads the configuration file.
 */
struct spf_config *load_config_file(char *file) {
    char *buf;
    char *bufptr;
    char *tbuf;
    int bufsiz = 128;
    int rc = 0;
    FILE *ffile;
    struct spf_filter *spff = NULL;
    struct spf_action *spfa = NULL;
    char *saveptr;
    char *token = NULL, *token2 = NULL;
    char *tptr;
    long int numval;
    struct spf_config *retval = NULL;
    int spff_count = 0;
    int lineno = 0;
    char *tmp;

    if (strcmp(file,"-") == 0)
    ffile = stdin;
    else {
    ffile = fopen(file,"r");
    if (!ffile) {
        verror("could not fopen config file %s: %s\n",file,strerror(errno));
        return NULL;
    }
    }

    retval = calloc(1,sizeof(*retval));

    /* Read directives line by line. */
    buf = malloc(bufsiz);
    while (1) {
    rc = 0;
    while (1) {
        errno = 0;
        tbuf = fgets(buf + rc,bufsiz - rc,ffile);
        if (tbuf && (rc += strlen(buf + rc)) == (bufsiz - 1) 
        && buf[bufsiz - 2] != '\n') {
        /* We filled up the buf; malloc more and keep going. */
        tbuf = malloc(bufsiz + 128);
        memcpy(tbuf,buf,bufsiz);
        free(buf);
        buf = tbuf;
        bufsiz += 128;
        }
        else if (tbuf && rc < bufsiz) {
        /* We have our line. */
        break;
        }
        else if (errno) {
        verror("fgets: %s (aborting filter file read)\n",
               strerror(errno));
        goto errout;
        }
        else {
        /* EOF. */
        free(buf);
        buf = NULL;
        break;
        }
    }

    if (!buf)
        break;

    ++lineno;
    vdebug(2,LA_USER,LF_U_CFG,"read line %d: '%s'\n",lineno,buf);

    if (*buf == '#')
        continue;

    if (buf[strlen(buf) - 1] == '\n') {
        if (*buf == '\n')
        continue;
        buf[strlen(buf) - 1] = '\0';
    }

    /*
     * ProbeFilter.
     */
    if (strncmp(buf,"ProbeFilter",strlen("ProbeFilter")) == 0) {
        bufptr = buf + strlen("ProbeFilter");
        while (isspace(*bufptr)) ++bufptr;

        spff = (struct spf_filter *)calloc(1,sizeof(*spff));
        /* Default. */
        spff->when = WHEN_PRE;

        /*
         * Parse the line.  We can't use strtok to split it up,
         * because there are strings and regexps, and we don't want
         * to place any restrictions on them.  So we just manually
         * lex it... forgotten too much flex yystuff to do it fast.
         */

        /* symbol name */
        token = bufptr;
        while (!isspace(*bufptr)) ++bufptr;
        *bufptr = '\0';
        spff->symbol = strdup(token);
        if ((tmp = index(spff->symbol,':'))) {
        spff->srcfile = spff->symbol;
        *tmp = '\0';
        spff->symbol = strdup(tmp+1);
        }
        ++bufptr;

        /* These are all optional; take them in any order. */
        while (*bufptr != '\0') {
        while (isspace(*bufptr)) ++bufptr;
        if (*bufptr == '\0')
            goto err;

        token = bufptr;
        while (isalnum(*bufptr) || *bufptr == '_') ++bufptr;
        if (*bufptr == '(') {
            *bufptr = '\0';
            ++bufptr;
        }
        else {
            *bufptr = '\0';
            ++bufptr;
            while (isspace(*bufptr)) ++bufptr;
            if (*bufptr != '(')
            goto err;
            ++bufptr;
        }

        if (strcmp(token,"id") == 0) {
            token = bufptr;
            while (isalnum(*bufptr) || *bufptr == '_') ++bufptr;
            if (*bufptr != ')')
            goto err;
            *bufptr = '\0';
            ++bufptr;
            if (spff->id)
            goto err;
            else
            spff->id = strdup(token);
        }
        else if (strcmp(token,"when") == 0) {
            if (strncmp(bufptr,"pre",strlen("pre")) == 0) {
            spff->when = WHEN_PRE;
            bufptr += strlen("pre");
            }
            else if (strncmp(bufptr,"post",strlen("post")) == 0) {
            spff->when = WHEN_POST;
            bufptr += strlen("post");
            }
            else
            goto err;
            if (*bufptr != ')')
            goto err;
            ++bufptr;
        }
        else if (strcmp(token,"disable") == 0) {
            if (*bufptr != ')')
            goto err;
            ++bufptr;

            spff->disable = 1;
        }
        else if (strcmp(token,"vfilter") == 0) {
            if (spff->pf)
            goto err;
            token = bufptr;
            /* Find the enclosing ')' */
            int isescaped = 0;
            char *nextbufptr = NULL;
            while (*bufptr != '\0') {
            if (*bufptr == '\\') {
                if (!isescaped)
                isescaped = 1;
                else 
                isescaped = 0;
            }
            else if (*bufptr == ')' && !isescaped) {
                nextbufptr = bufptr + 1;
                *bufptr = '\0';
                break;
            }
            ++bufptr;
            }
            if (!nextbufptr)
            goto err;
            spff->pf = target_nv_filter_parse(token);
            if (!spff->pf)
            goto err;
            bufptr = nextbufptr;
        }
        else if (strcmp(token,"tfilter") == 0) {
            if (spff->ttf)
            goto err;
            token = bufptr;
            /* Find the enclosing ')' */
            int isescaped = 0;
            char *nextbufptr = NULL;
            while (*bufptr != '\0') {
            if (*bufptr == '\\') {
                if (!isescaped)
                isescaped = 1;
                else 
                isescaped = 0;
            }
            else if (*bufptr == ')' && !isescaped) {
                nextbufptr = bufptr + 1;
                *bufptr = '\0';
                break;
            }
            ++bufptr;
            }
            if (!nextbufptr)
            goto err;
            spff->ttf = target_nv_filter_parse(token);
            if (!spff->ttf)
            goto err;
            bufptr = nextbufptr;
        }
        else if (strcmp(token,"abort") == 0) {
            token = bufptr;
            while (*bufptr == '-' || isdigit(*bufptr)) ++bufptr;
            if (*bufptr != ')')
            goto err;
            *bufptr = '\0';
            ++bufptr;
            errno = 0;
            numval = strtol(token,NULL,0);
            if (errno)
            goto err;

            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_ABORT;
            spfa->abort.retval = numval;

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"print") == 0) {
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_PRINT;

            if (*bufptr == ')') {
            ++bufptr;
            }
            else {
            /*
             * XXX: use strtok here ignore the possibility that
             * the msg field has a comma in it.  Time is not on
             * my side...
             */
            char *nextbufptr = NULL;
            nextbufptr = _get_next_non_enc_esc(bufptr,')');
            if (!nextbufptr)
                goto err;
            *nextbufptr = '\0';
            ++nextbufptr;
            token = NULL;
            token2 = NULL;
            saveptr = NULL;
            while ((token = strtok_r((!token) ? bufptr : NULL,",",
                         &saveptr))) {
                tptr = token;
                while (*tptr != '\0') {
                if (*tptr == '=') {
                    *tptr = '\0';
                    token2 = ++tptr;
                    break;
                }
                ++tptr;
                }
                if (!token2)
                goto err;

                if (strcmp(token,"ttctx") == 0) {
                if (strcmp(token2,"none") == 0)
                    spfa->print.ttctx = 0;
                else if (strcmp(token2,"self") == 0)
                    spfa->print.ttctx = 1;
                else if (strcmp(token2,"hier") == 0)
                    spfa->print.ttctx = 2;
                else if (strcmp(token2,"all") == 0)
                    spfa->print.ttctx = 3;
                else
                    goto err;
                }
                else if (strcmp(token,"ttdetail") == 0) {
                spfa->print.ttdetail = atoi(token2);
                }
                else 
                goto err;
            }
            bufptr = nextbufptr;
            }

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"report") == 0) {
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_REPORT;

            /* Set some defaults. */
            spfa->report.rt = 'i';
            spfa->report.overlay_levels = 0;
            spfa->report.overlay_debuginfo_prefix = NULL;

            /*
             * XXX: use strtok here ignore the possibility that
             * the msg field has a comma in it.  Time is not on
             * my side...
             */
            char *nextbufptr = NULL;
            nextbufptr = _get_next_non_enc_esc(bufptr,')');
            if (!nextbufptr)
            goto err;
            *nextbufptr = '\0';
            ++nextbufptr;
            token = NULL;
            token2 = NULL;
            saveptr = NULL;
            while ((token = strtok_r((!token) ? bufptr : NULL,",",
                         &saveptr))) {
            tptr = token;
            while (*tptr != '\0') {
                if (*tptr == '=') {
                *tptr = '\0';
                token2 = ++tptr;
                break;
                }
                ++tptr;
            }
            if (!token2)
                goto err;

            if (strcmp(token,"rt") == 0) {
                if (*token2 == 'f')
                spfa->report.rt = *token2;
                else if (*token2 == 'i')
                spfa->report.rt = *token2;
                else
                goto err;
            }
            else if (strcmp(token,"tn") == 0) {
                spfa->report.tn = strdup(token2);
            }
            else if (strcmp(token,"tid") == 0) {
                errno = 0;
                spfa->report.tid = strtol(token2,NULL,0);
                if (errno)
                goto err;
            }
            else if (strcmp(token,"rv") == 0) {
                spfa->report.rv = strdup(token2);
            }
            else if (strcmp(token,"msg") == 0) {
                if (*token2 != '"') {
                spfa->report.msg = malloc(2+1+strlen(token2));
                snprintf(spfa->report.msg,2+1+strlen(token2),
                     "\"%s\"",token2);
                }
                else
                spfa->report.msg = strdup(token2);
            }
            else if (strcmp(token,"ttctx") == 0) {
                if (strcmp(token2,"none") == 0)
                spfa->report.ttctx = 0;
                else if (strcmp(token2,"self") == 0)
                spfa->report.ttctx = 1;
                else if (strcmp(token2,"hier") == 0)
                spfa->report.ttctx = 2;
                else if (strcmp(token2,"all") == 0)
                spfa->report.ttctx = 3;
                else
                goto err;
            }
            else if (strcmp(token,"ttdetail") == 0) {
                spfa->report.ttdetail = atoi(token2);
            }
            else if (strcmp(token,"bt") == 0) {
                spfa->report.bt = atoi(token2);
            }
            else if (strcmp(token,"overlay_levels") == 0) {
                spfa->report.overlay_levels = atoi(token2);
            }
            else if (strcmp(token,"overlay_debuginfo_root_prefix") == 0) {
                spfa->report.overlay_debuginfo_prefix =
                strdup(token2);
            }
            else 
                goto err;
            }
            bufptr = nextbufptr;

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"exit") == 0) {
            token = bufptr;
            while (*bufptr == '-' || isdigit(*bufptr)) ++bufptr;
            if (*bufptr != ')')
            goto err;
            *bufptr = '\0';
            ++bufptr;
            errno = 0;
            numval = strtol(token,NULL,0);
            if (errno)
            goto err;

            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_EXIT;
            spfa->exit.retval = numval;

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"enable") == 0) {
            token = bufptr;
            while (isalnum(*bufptr) || *bufptr == '_') ++bufptr;
            if (*bufptr != ')')
            goto err;
            *bufptr = '\0';
            ++bufptr;
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_ENABLE;
            spfa->enable.id = strdup(token);

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"disable") == 0) {
            token = bufptr;
            while (isalnum(*bufptr) || *bufptr == '_') ++bufptr;
            if (*bufptr != ')')
            goto err;
            *bufptr = '\0';
            ++bufptr;
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_DISABLE;
            spfa->disable.id = strdup(token);

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"remove") == 0) {
            token = bufptr;
            while (isalnum(*bufptr) || *bufptr == '_') ++bufptr;
            if (*bufptr != ')')
            goto err;
            *bufptr = '\0';
            ++bufptr;
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_REMOVE;
            spfa->remove.id = strdup(token);

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"bt") == 0) {
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_BT;

            /* Set some defaults. */
            spfa->bt.tid = -1;
            spfa->bt.thid = NULL;
            spfa->bt.overlay_levels = 0;
            spfa->bt.overlay_debuginfo_prefix = NULL;

            char *nextbufptr = NULL;
            nextbufptr = _get_next_non_enc_esc(bufptr,')');
            if (!nextbufptr)
            goto err;
            *nextbufptr = '\0';
            ++nextbufptr;
            token = NULL;
            token2 = NULL;
            saveptr = NULL;

            int lpc = 0;
            while ((token = strtok_r((!token) ? bufptr : NULL,",",
                         &saveptr))) {
            if (lpc == 0)
                spfa->bt.tid = atoi(token);
            else if (lpc == 1)
                spfa->bt.thid = strdup(token);
            else if (lpc == 2)
                spfa->bt.overlay_levels = atoi(token);
            else if (lpc == 3)
                spfa->bt.overlay_debuginfo_prefix = strdup(token);
            else 
                goto err;

            ++lpc;
            }
            bufptr = nextbufptr;

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else if (strcmp(token,"signal") == 0) {
            spfa = calloc(1,sizeof(*spfa));
            spfa->atype = SPF_ACTION_SIGNAL;

            /* Set some defaults. */
            spfa->signal.tid = -1;
            spfa->signal.thid = NULL;

            char *nextbufptr = NULL;
            nextbufptr = _get_next_non_enc_esc(bufptr,')');
            if (!nextbufptr)
            goto err;
            *nextbufptr = '\0';
            ++nextbufptr;
            token = NULL;
            token2 = NULL;
            saveptr = NULL;

            int lpc = 0;
            while ((token = strtok_r((!token) ? bufptr : NULL,",",
                         &saveptr))) {
            if (lpc == 0)
                spfa->signal.tid = atoi(token);
            else if (lpc == 1)
                spfa->signal.thid = strdup(token);
            else if (lpc == 2)
                spfa->signal.sigdesc = strdup(token);
            else
                goto err;

            ++lpc;
            }
            bufptr = nextbufptr;

            spff->actions = g_slist_append(spff->actions,spfa);
            spfa = NULL;
        }
        else 
            goto err;
        }

        retval->spf_filter_list =
        g_slist_append(retval->spf_filter_list,spff);
        spff = NULL;
        ++spff_count;
    }
    else {
        /*
         * Invalid rule
         */
        fprintf(stderr,"ERROR: unknown config directive line %d:\n",lineno);
        fprintf(stderr,"%s\n", buf);
        goto errout;
    }
    }

    fclose(ffile);

    if (buf)
    free(buf);

    vdebug(2,LA_USER,LF_U_CFG,"configfile: %d probefilters.\n",spff_count);

    return retval;

 err:
    verror("parse error at line %d col %d: '%.48s ...'\n",
       lineno,(int)(bufptr - buf),bufptr);

 errout:
    fclose(ffile);

    if (spfa)
    spf_action_free(spfa);
    if (spff)
    spf_filter_free(spff);
    if (retval)
    spf_config_free(retval);

    if (buf)
    free(buf);

    return NULL;
}