/* $OpenBSD: conf.c,v 1.108 2025/04/30 03:53:21 tb Exp $         */
/* $EOM: conf.c,v 1.48 2000/12/04 02:04:29 angelos Exp $         */

/*
 * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist.  All rights reserved.
 * Copyright (c) 2000, 2001, 2002 Håkan Olsson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "app.h"
#include "conf.h"
#include "log.h"
#include "monitor.h"
#include "util.h"

static char    *conf_get_trans_str(int, char *, char *);
static void     conf_load_defaults(int);
#if 0
static int      conf_find_trans_xf(int, char *);
#endif

struct conf_trans {
        TAILQ_ENTRY(conf_trans) link;
        int      trans;
        enum conf_op {
                CONF_SET, CONF_REMOVE, CONF_REMOVE_SECTION
        }        op;
        char    *section;
        char    *tag;
        char    *value;
        int      override;
        int      is_default;
};

#define CONF_SECT_MAX 256

TAILQ_HEAD(conf_trans_head, conf_trans) conf_trans_queue;

struct conf_binding {
        LIST_ENTRY(conf_binding) link;
        char    *section;
        char    *tag;
        char    *value;
        int      is_default;
};

char    *conf_path = CONFIG_FILE;
LIST_HEAD(conf_bindings, conf_binding) conf_bindings[256];

static char     *conf_addr;
static __inline__ u_int8_t
conf_hash(char *s)
{
        u_int8_t hash = 0;

        while (*s) {
                hash = ((hash << 1) | (hash >> 7)) ^ tolower((unsigned char)*s);
                s++;
        }
        return hash;
}

/*
 * Insert a tag-value combination from LINE (the equal sign is at POS)
 */
static int
conf_remove_now(char *section, char *tag)
{
        struct conf_binding *cb, *next;

        for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
            cb = next) {
                next = LIST_NEXT(cb, link);
                if (strcasecmp(cb->section, section) == 0 &&
                    strcasecmp(cb->tag, tag) == 0) {
                        LIST_REMOVE(cb, link);
                        LOG_DBG((LOG_MISC, 95, "[%s]:%s->%s removed", section,
                            tag, cb->value));
                        free(cb->section);
                        free(cb->tag);
                        free(cb->value);
                        free(cb);
                        return 0;
                }
        }
        return 1;
}

static int
conf_remove_section_now(char *section)
{
        struct conf_binding *cb, *next;
        int     unseen = 1;

        for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
            cb = next) {
                next = LIST_NEXT(cb, link);
                if (strcasecmp(cb->section, section) == 0) {
                        unseen = 0;
                        LIST_REMOVE(cb, link);
                        LOG_DBG((LOG_MISC, 95, "[%s]:%s->%s removed", section,
                            cb->tag, cb->value));
                        free(cb->section);
                        free(cb->tag);
                        free(cb->value);
                        free(cb);
                }
        }
        return unseen;
}

/*
 * Insert a tag-value combination from LINE (the equal sign is at POS)
 * into SECTION of our configuration database.
 */
static int
conf_set_now(char *section, char *tag, char *value, int override,
    int is_default)
{
        struct conf_binding *node = 0;

        if (override)
                conf_remove_now(section, tag);
        else if (conf_get_str(section, tag)) {
                if (!is_default)
                        log_print("conf_set_now: duplicate tag [%s]:%s, "
                            "ignoring...\n", section, tag);
                return 1;
        }
        node = calloc(1, sizeof *node);
        if (!node) {
                log_error("conf_set_now: calloc (1, %lu) failed",
                    (unsigned long)sizeof *node);
                return 1;
        }
        node->section = node->tag = node->value = NULL;
        if ((node->section = strdup(section)) == NULL)
                goto fail;
        if ((node->tag = strdup(tag)) == NULL)
                goto fail;
        if ((node->value = strdup(value)) == NULL)
                goto fail;
        node->is_default = is_default;

        LIST_INSERT_HEAD(&conf_bindings[conf_hash(section)], node, link);
        LOG_DBG((LOG_MISC, 95, "conf_set_now: [%s]:%s->%s", node->section,
            node->tag, node->value));
        return 0;
fail:
        free(node->value);
        free(node->tag);
        free(node->section);
        free(node);
        return 1;
}

/*
 * Parse the line LINE of SZ bytes.  Skip Comments, recognize section
 * headers and feed tag-value pairs into our configuration database.
 */
static void
conf_parse_line(int trans, char *line, int ln, size_t sz)
{
        char    *val;
        size_t   i;
        int      j;
        static char *section = 0;

        /* Lines starting with '#' or ';' are comments.  */
        if (*line == '#' || *line == ';')
                return;

        /* '[section]' parsing...  */
        if (*line == '[') {
                for (i = 1; i < sz; i++)
                        if (line[i] == ']')
                                break;
                free(section);
                if (i == sz) {
                        log_print("conf_parse_line: %d:"
                            "unmatched ']', ignoring until next section", ln);
                        section = 0;
                        return;
                }
                section = malloc(i);
                if (!section) {
                        log_print("conf_parse_line: %d: malloc (%lu) failed",
                            ln, (unsigned long)i);
                        return;
                }
                strlcpy(section, line + 1, i);
                return;
        }
        /* Deal with assignments.  */
        for (i = 0; i < sz; i++)
                if (line[i] == '=') {
                        /* If no section, we are ignoring the lines.  */
                        if (!section) {
                                log_print("conf_parse_line: %d: ignoring line "
                                    "due to no section", ln);
                                return;
                        }
                        line[strcspn(line, " \t=")] = '\0';
                        val = line + i + 1 + strspn(line + i + 1, " \t");
                        /* Skip trailing whitespace, if any */
                        for (j = sz - (val - line) - 1; j > 0 &&
                            isspace((unsigned char)val[j]); j--)
                                val[j] = '\0';
                        /* XXX Perhaps should we not ignore errors?  */
                        conf_set(trans, section, line, val, 0, 0);
                        return;
                }
        /* Other non-empty lines are weird.  */
        i = strspn(line, " \t");
        if (line[i])
                log_print("conf_parse_line: %d: syntax error", ln);
}

/* Parse the mapped configuration file.  */
static void
conf_parse(int trans, char *buf, size_t sz)
{
        char    *cp = buf;
        char    *bufend = buf + sz;
        char    *line;
        int     ln = 1;

        line = cp;
        while (cp < bufend) {
                if (*cp == '\n') {
                        /* Check for escaped newlines.  */
                        if (cp > buf && *(cp - 1) == '\\')
                                *(cp - 1) = *cp = ' ';
                        else {
                                *cp = '\0';
                                conf_parse_line(trans, line, ln, cp - line);
                                line = cp + 1;
                        }
                        ln++;
                }
                cp++;
        }
        if (cp != line)
                log_print("conf_parse: last line unterminated, ignored.");
}

/*
 * Auto-generate default configuration values for the transforms and
 * suites the user wants.
 *
 * Resulting section names can be:
 *  For main mode:
 *     {BLF,3DES,CAST,AES,AES-{128,192,256}-{MD5,SHA,SHA2-{256,384,512}} \
 *         [-GRP{1,2,5,14-21,25-30}][-{DSS,RSA_SIG}]
 *  For quick mode:
 *     QM-{proto}[-TRP]-{cipher}[-{hash}][-PFS[-{group}]]-SUITE
 *     where
 *       {proto}  = ESP, AH
 *       {cipher} = 3DES, CAST, BLF, AES, AES-{128,192,256}, AESCTR
 *       {hash}   = MD5, SHA, RIPEMD, SHA2-{256,384,512}
 *       {group}  = GRP{1,2,5,14-21,25-30}
 *
 * DH group defaults to MODP_1024.
 *
 * XXX We may want to support USE_TRIPLEDES, etc...
 * XXX No EC2N DH support here yet.
 */

/* Find the value for a section+tag in the transaction list.  */
static char *
conf_get_trans_str(int trans, char *section, char *tag)
{
        struct conf_trans *node, *nf = 0;

        for (node = TAILQ_FIRST(&conf_trans_queue); node;
            node = TAILQ_NEXT(node, link))
                if (node->trans == trans && strcasecmp(section, node->section)
                    == 0 && strcasecmp(tag, node->tag) == 0) {
                        if (!nf)
                                nf = node;
                        else if (node->override)
                                nf = node;
                }
        return nf ? nf->value : 0;
}

#if 0
/* XXX Currently unused.  */
static int
conf_find_trans_xf(int phase, char *xf)
{
        struct conf_trans *node;
        char    *p;

        /* Find the relevant transforms and suites, if any.  */
        for (node = TAILQ_FIRST(&conf_trans_queue); node;
            node = TAILQ_NEXT(node, link))
                if ((phase == 1 && strcmp("Transforms", node->tag) == 0) ||
                    (phase == 2 && strcmp("Suites", node->tag) == 0)) {
                        p = node->value;
                        while ((p = strstr(p, xf)) != NULL)
                                if (*(p + strlen(p)) &&
                                    *(p + strlen(p)) != ',')
                                        p += strlen(p);
                                else
                                        return 1;
                }
        return 0;
}
#endif

static void
conf_load_defaults_mm(int tr, char *mme, char *mmh, char *mma, char *dhg,
    char *mme_p, char *mma_p, char *dhg_p, char *mmh_p)
{
        char sect[CONF_SECT_MAX];

        snprintf(sect, sizeof sect, "%s%s%s%s", mme_p, mmh_p, dhg_p, mma_p);

        LOG_DBG((LOG_MISC, 95, "conf_load_defaults_mm: main mode %s", sect));

        conf_set(tr, sect, "ENCRYPTION_ALGORITHM", mme, 0, 1);
        if (strcmp(mme, "BLOWFISH_CBC") == 0)
                conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_BLF_KEYLEN, 0,
                    1);
        else if (strcmp(mme_p, "AES-128") == 0)
                conf_set(tr, sect, "KEY_LENGTH", "128,128:128", 0, 1);
        else if (strcmp(mme_p, "AES-192") == 0)
                conf_set(tr, sect, "KEY_LENGTH", "192,192:192", 0, 1);
        else if (strcmp(mme_p, "AES-256") == 0)
                conf_set(tr, sect, "KEY_LENGTH", "256,256:256", 0, 1);
        else if (strcmp(mme, "AES_CBC") == 0)
                conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_AES_KEYLEN, 0,
                    1);

        conf_set(tr, sect, "HASH_ALGORITHM", mmh, 0, 1);
        conf_set(tr, sect, "AUTHENTICATION_METHOD", mma, 0, 1);
        conf_set(tr, sect, "GROUP_DESCRIPTION", dhg, 0, 1);
        conf_set(tr, sect, "Life", CONF_DFLT_TAG_LIFE_MAIN_MODE, 0, 1);
}

static void
conf_load_defaults_qm(int tr, char *qme, char *qmh, char *dhg, char *qme_p,
    char *qmh_p, char *qm_ah_id, char *dhg_p, int proto, int mode, int pfs)
{
        char sect[CONF_SECT_MAX], tmp[CONF_SECT_MAX];

        /* Helper #defines, incl abbreviations.  */
#define PROTO(x)  ((x) ? "AH" : "ESP")
#define PFS(x)    ((x) ? "-PFS" : "")
#define MODE(x)   ((x) ? "TRANSPORT" : "TUNNEL")
#define MODE_p(x) ((x) ? "-TRP" : "")

        /* For AH a hash must be present and no encryption is allowed */
        if (proto == 1 && (strcmp(qmh, "NONE") == 0 ||
            strcmp(qme, "NONE") != 0))
                return;

        /* For ESP encryption must be provided, an empty hash is ok. */
        if (proto == 0 && strcmp(qme, "NONE") == 0)
                return;

        /* When PFS is disabled no DH group must be specified. */
        if (pfs == 0 && strcmp(dhg_p, ""))
                return;

        /* For GCM no additional authentication must be specified */
        if (proto == 0 && strcmp(qmh, "NONE") != 0 &&
            (strcmp(qme, "AES_GCM_16") == 0 || strcmp(qme, "AES_GMAC") == 0))
                return;

        snprintf(tmp, sizeof tmp, "QM-%s%s%s%s%s%s", PROTO(proto),
            MODE_p(mode), qme_p, qmh_p, PFS(pfs), dhg_p);

        strlcpy(sect, tmp, CONF_SECT_MAX);
        strlcat(sect, "-SUITE", CONF_SECT_MAX);

        LOG_DBG((LOG_MISC, 95, "conf_load_defaults_qm: quick mode %s", sect));

        conf_set(tr, sect, "Protocols", tmp, 0, 1);
        snprintf(sect, sizeof sect, "IPSEC_%s", PROTO(proto));
        conf_set(tr, tmp, "PROTOCOL_ID", sect, 0, 1);
        strlcpy(sect, tmp, CONF_SECT_MAX);
        strlcat(sect, "-XF", CONF_SECT_MAX);
        conf_set(tr, tmp, "Transforms", sect, 0, 1);

        /*
         * XXX For now, defaults
         * contain one xf per protocol.
         */
        if (proto == 0)
                conf_set(tr, sect, "TRANSFORM_ID", qme, 0, 1);
        else
                conf_set(tr, sect, "TRANSFORM_ID", qm_ah_id, 0, 1);
        if (strcmp(qme ,"BLOWFISH") == 0)
                conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_BLF_KEYLEN, 0,
                         1);
        else if (strcmp(qme_p, "-AES-128") == 0 ||
            strcmp(qme_p, "-AESCTR-128") == 0 ||
            strcmp(qme_p, "-AESGCM-128") == 0 ||
            strcmp(qme_p, "-AESGMAC-128") == 0)
                conf_set(tr, sect, "KEY_LENGTH", "128,128:128", 0, 1);
        else if (strcmp(qme_p, "-AES-192") == 0 ||
            strcmp(qme_p, "-AESCTR-192") == 0 ||
            strcmp(qme_p, "-AESGCM-192") == 0 ||
            strcmp(qme_p, "-AESGMAC-192") == 0)
                conf_set(tr, sect, "KEY_LENGTH", "192,192:192", 0, 1);
        else if (strcmp(qme_p, "-AES-256") == 0 ||
            strcmp(qme_p, "-AESCTR-256") == 0 ||
            strcmp(qme_p, "-AESGCM-256") == 0 ||
            strcmp(qme_p, "-AESGMAC-256") == 0)
                conf_set(tr, sect, "KEY_LENGTH", "256,256:256", 0, 1);
        else if (strcmp(qme, "AES") == 0)
                conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_AES_KEYLEN, 0,
                         1);

        conf_set(tr, sect, "ENCAPSULATION_MODE", MODE(mode), 0, 1);
        if (strcmp(qmh, "NONE")) {
                conf_set(tr, sect, "AUTHENTICATION_ALGORITHM", qmh, 0, 1);

                /* XXX Another shortcut to keep length down */
                if (pfs)
                        conf_set(tr, sect, "GROUP_DESCRIPTION", dhg, 0, 1);
        }

        /* XXX Lifetimes depending on enc/auth strength? */
        conf_set(tr, sect, "Life", CONF_DFLT_TAG_LIFE_QUICK_MODE, 0, 1);
}

static void
conf_load_defaults(int tr)
{
        int      enc, auth, hash, group, proto, mode, pfs;
        char    *dflt;

        char    *mm_auth[] = {"PRE_SHARED", "DSS", "RSA_SIG", 0};
        char    *mm_auth_p[] = {"", "-DSS", "-RSA_SIG", 0};
        char    *mm_hash[] = {"MD5", "SHA", "SHA2_256", "SHA2_384", "SHA2_512",
                     0};
        char    *mm_hash_p[] = {"-MD5", "-SHA", "-SHA2-256", "-SHA2-384",
                    "-SHA2-512", "", 0 };
        char    *mm_enc[] = {"BLOWFISH_CBC", "3DES_CBC", "CAST_CBC",
                    "AES_CBC", "AES_CBC", "AES_CBC", "AES_CBC", 0};
        char    *mm_enc_p[] = {"BLF", "3DES", "CAST", "AES", "AES-128",
                    "AES-192", "AES-256", 0};
        char    *dhgroup[] = {"MODP_1024", "MODP_768", "MODP_1024",
                    "MODP_1536", "MODP_2048", "MODP_3072", "MODP_4096",
                    "MODP_6144", "MODP_8192",
                    "ECP_256", "ECP_384", "ECP_521", "ECP_224",
                    "BP_224", "BP_256", "BP_384", "BP_512", 0};
        char    *dhgroup_p[] = {"", "-GRP1", "-GRP2", "-GRP5", "-GRP14",
                    "-GRP15", "-GRP16", "-GRP17", "-GRP18", "-GRP19", "-GRP20",
                    "-GRP21", "-GRP26", "-GRP27", "-GRP28", "-GRP29",
                    "-GRP30", 0};
        char    *qm_enc[] = {"3DES", "CAST", "BLOWFISH", "AES",
                    "AES", "AES", "AES", "AES_CTR", "AES_CTR", "AES_CTR",
                    "AES_CTR", "AES_GCM_16",
                    "AES_GCM_16", "AES_GCM_16", "AES_GMAC", "AES_GMAC",
                    "AES_GMAC", "NULL", "NONE", 0};
        char    *qm_enc_p[] = {"-3DES", "-CAST", "-BLF", "-AES",
                    "-AES-128", "-AES-192", "-AES-256", "-AESCTR",
                    "-AESCTR-128", "-AESCTR-192", "-AESCTR-256",
                    "-AESGCM-128", "-AESGCM-192", "-AESGCM-256",
                    "-AESGMAC-128", "-AESGMAC-192", "-AESGMAC-256", "-NULL",
                    "", 0};
        char    *qm_hash[] = {"HMAC_MD5", "HMAC_SHA", "HMAC_RIPEMD",
                    "HMAC_SHA2_256", "HMAC_SHA2_384", "HMAC_SHA2_512", "NONE",
                    0};
        char    *qm_hash_p[] = {"-MD5", "-SHA", "-RIPEMD", "-SHA2-256",
                    "-SHA2-384", "-SHA2-512", "", 0};
        char    *qm_ah_id[] = {"MD5", "SHA", "RIPEMD", "SHA2_256", "SHA2_384",
                    "SHA2_512", "", 0};

        /* General and X509 defaults */
        conf_set(tr, "General", "Retransmits", CONF_DFLT_RETRANSMITS, 0, 1);
        conf_set(tr, "General", "Exchange-max-time", CONF_DFLT_EXCH_MAX_TIME,
            0, 1);
        conf_set(tr, "General", "Use-Keynote", CONF_DFLT_USE_KEYNOTE, 0, 1);
        conf_set(tr, "General", "Policy-file", CONF_DFLT_POLICY_FILE, 0, 1);
        conf_set(tr, "General", "Pubkey-directory", CONF_DFLT_PUBKEY_DIR, 0,
            1);

        conf_set(tr, "X509-certificates", "CA-directory",
            CONF_DFLT_X509_CA_DIR, 0, 1);
        conf_set(tr, "X509-certificates", "Cert-directory",
            CONF_DFLT_X509_CERT_DIR, 0, 1);
        conf_set(tr, "X509-certificates", "Private-key",
            CONF_DFLT_X509_PRIVATE_KEY, 0, 1);
        conf_set(tr, "X509-certificates", "Private-key-directory",
            CONF_DFLT_X509_PRIVATE_KEY_DIR, 0, 1);
        conf_set(tr, "X509-certificates", "CRL-directory",
            CONF_DFLT_X509_CRL_DIR, 0, 1);

        conf_set(tr, "KeyNote", "Credential-directory",
            CONF_DFLT_KEYNOTE_CRED_DIR, 0, 1);

        conf_set(tr, "General", "Delete-SAs", CONF_DFLT_DELETE_SAS, 0, 1);

        /* Lifetimes. XXX p1/p2 vs main/quick mode may be unclear.  */
        dflt = conf_get_trans_str(tr, "General", "Default-phase-1-lifetime");
        conf_set(tr, CONF_DFLT_TAG_LIFE_MAIN_MODE, "LIFE_TYPE",
            CONF_DFLT_TYPE_LIFE_MAIN_MODE, 0, 1);
        conf_set(tr, CONF_DFLT_TAG_LIFE_MAIN_MODE, "LIFE_DURATION",
            (dflt ? dflt : CONF_DFLT_VAL_LIFE_MAIN_MODE), 0, 1);

        dflt = conf_get_trans_str(tr, "General", "Default-phase-2-lifetime");
        conf_set(tr, CONF_DFLT_TAG_LIFE_QUICK_MODE, "LIFE_TYPE",
            CONF_DFLT_TYPE_LIFE_QUICK_MODE, 0, 1);
        conf_set(tr, CONF_DFLT_TAG_LIFE_QUICK_MODE, "LIFE_DURATION",
            (dflt ? dflt : CONF_DFLT_VAL_LIFE_QUICK_MODE), 0, 1);

        /* Default Phase-1 Configuration section */
        conf_set(tr, CONF_DFLT_TAG_PHASE1_CONFIG, "EXCHANGE_TYPE",
            CONF_DFLT_PHASE1_EXCH_TYPE, 0, 1);
        conf_set(tr, CONF_DFLT_TAG_PHASE1_CONFIG, "Transforms",
            CONF_DFLT_PHASE1_TRANSFORMS, 0, 1);

        /* Main modes */
        for (enc = 0; mm_enc[enc]; enc++)
                for (hash = 0; mm_hash[hash]; hash++)
                        for (auth = 0; mm_auth[auth]; auth++)
                                for (group = 0; dhgroup_p[group]; group++)
                                        conf_load_defaults_mm (tr, mm_enc[enc],
                                            mm_hash[hash], mm_auth[auth],
                                            dhgroup[group], mm_enc_p[enc],
                                            mm_auth_p[auth], dhgroup_p[group],
                                            mm_hash_p[hash]);

        /* Setup a default Phase 1 entry */
        conf_set(tr, "Phase 1", "Default", "Default-phase-1", 0, 1);
        conf_set(tr, "Default-phase-1", "Phase", "1", 0, 1);
        conf_set(tr, "Default-phase-1", "Configuration",
            "Default-phase-1-configuration", 0, 1);
        dflt = conf_get_trans_str(tr, "General", "Default-phase-1-ID");
        if (dflt)
                conf_set(tr, "Default-phase-1", "ID", dflt, 0, 1);

        /* Quick modes */
        for (enc = 0; qm_enc[enc]; enc++)
                for (proto = 0; proto < 2; proto++)
                        for (mode = 0; mode < 2; mode++)
                                for (pfs = 0; pfs < 2; pfs++)
                                        for (hash = 0; qm_hash[hash]; hash++)
                                                for (group = 0;
                                                    dhgroup_p[group]; group++)
                                                        conf_load_defaults_qm(
                                                            tr, qm_enc[enc],
                                                            qm_hash[hash],
                                                            dhgroup[group],
                                                            qm_enc_p[enc],
                                                            qm_hash_p[hash],
                                                            qm_ah_id[hash],
                                                            dhgroup_p[group],
                                                            proto, mode, pfs);
}

void
conf_init(void)
{
        unsigned int i;

        for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
                LIST_INIT(&conf_bindings[i]);
        TAILQ_INIT(&conf_trans_queue);
        conf_reinit();
}

/* Open the config file and map it into our address space, then parse it.  */
void
conf_reinit(void)
{
        struct conf_binding *cb = 0;
        int      fd, trans;
        unsigned int i;
        size_t   sz;
        char    *new_conf_addr = 0;

        fd = monitor_open(conf_path, O_RDONLY, 0);
        if (fd == -1 || check_file_secrecy_fd(fd, conf_path, &sz) == -1) {
                if (fd == -1 && errno != ENOENT)
                        log_error("conf_reinit: open(\"%s\", O_RDONLY, 0) "
                            "failed", conf_path);
                if (fd != -1)
                        close(fd);

                trans = conf_begin();
        } else {
                new_conf_addr = malloc(sz);
                if (!new_conf_addr) {
                        log_error("conf_reinit: malloc (%lu) failed",
                            (unsigned long)sz);
                        goto fail;
                }
                /* XXX I assume short reads won't happen here.  */
                if (read(fd, new_conf_addr, sz) != (int)sz) {
                        log_error("conf_reinit: read (%d, %p, %lu) failed",
                            fd, new_conf_addr, (unsigned long)sz);
                        goto fail;
                }
                close(fd);

                trans = conf_begin();

                /* XXX Should we not care about errors and rollback?  */
                conf_parse(trans, new_conf_addr, sz);
        }

        /* Load default configuration values.  */
        conf_load_defaults(trans);

        /* Free potential existing configuration.  */
        if (conf_addr) {
                for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0];
                    i++)
                        for (cb = LIST_FIRST(&conf_bindings[i]); cb;
                            cb = LIST_FIRST(&conf_bindings[i]))
                                conf_remove_now(cb->section, cb->tag);
                free(conf_addr);
        }
        conf_end(trans, 1);
        conf_addr = new_conf_addr;
        return;

fail:
        free(new_conf_addr);
        close(fd);
}

/*
 * Return the numeric value denoted by TAG in section SECTION or DEF
 * if that tag does not exist.
 */
int
conf_get_num(char *section, char *tag, int def)
{
        char    *value = conf_get_str(section, tag);

        if (value)
                return atoi(value);
        return def;
}

/*
 * Return the socket endpoint address denoted by TAG in SECTION as a
 * struct sockaddr.  It is the callers responsibility to deallocate
 * this structure when it is finished with it.
 */
struct sockaddr *
conf_get_address(char *section, char *tag)
{
        char    *value = conf_get_str(section, tag);
        struct sockaddr *sa;

        if (!value)
                return 0;
        if (text2sockaddr(value, 0, &sa, 0, 0) == -1)
                return 0;
        return sa;
}

/* Validate X according to the range denoted by TAG in section SECTION.  */
int
conf_match_num(char *section, char *tag, int x)
{
        char    *value = conf_get_str(section, tag);
        int      val, min, max, n;

        if (!value)
                return 0;
        n = sscanf(value, "%d,%d:%d", &val, &min, &max);
        switch (n) {
        case 1:
                LOG_DBG((LOG_MISC, 95, "conf_match_num: %s:%s %d==%d?",
                    section, tag, val, x));
                return x == val;
        case 3:
                LOG_DBG((LOG_MISC, 95, "conf_match_num: %s:%s %d<=%d<=%d?",
                    section, tag, min, x, max));
                return min <= x && max >= x;
        default:
                log_error("conf_match_num: section %s tag %s: invalid number "
                    "spec %s", section, tag, value);
        }
        return 0;
}

/* Return the string value denoted by TAG in section SECTION.  */
char *
conf_get_str(char *section, char *tag)
{
        struct conf_binding *cb;

        for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
            cb = LIST_NEXT(cb, link))
                if (strcasecmp(section, cb->section) == 0 &&
                    strcasecmp(tag, cb->tag) == 0) {
                        LOG_DBG((LOG_MISC, 95, "conf_get_str: [%s]:%s->%s",
                            section, tag, cb->value));
                        return cb->value;
                }
        LOG_DBG((LOG_MISC, 95,
            "conf_get_str: configuration value not found [%s]:%s", section,
            tag));
        return 0;
}

/*
 * Build a list of string values out of the comma separated value denoted by
 * TAG in SECTION.
 */
struct conf_list *
conf_get_list(char *section, char *tag)
{
        char    *liststr = 0, *p, *field, *t;
        struct conf_list *list = 0;
        struct conf_list_node *node = 0;

        list = malloc(sizeof *list);
        if (!list)
                goto cleanup;
        TAILQ_INIT(&list->fields);
        list->cnt = 0;
        liststr = conf_get_str(section, tag);
        if (!liststr)
                goto cleanup;
        liststr = strdup(liststr);
        if (!liststr)
                goto cleanup;
        p = liststr;
        while ((field = strsep(&p, ",")) != NULL) {
                /* Skip leading whitespace */
                while (isspace((unsigned char)*field))
                        field++;
                /* Skip trailing whitespace */
                if (p)
                        for (t = p - 1; t > field && isspace((unsigned char)*t); t--)
                                *t = '\0';
                if (*field == '\0') {
                        log_print("conf_get_list: empty field, ignoring...");
                        continue;
                }
                list->cnt++;
                node = calloc(1, sizeof *node);
                if (!node)
                        goto cleanup;
                node->field = strdup(field);
                if (!node->field)
                        goto cleanup;
                TAILQ_INSERT_TAIL(&list->fields, node, link);
        }
        free(liststr);
        return list;

cleanup:
        free(node);
        if (list)
                conf_free_list(list);
        free(liststr);
        return 0;
}

struct conf_list *
conf_get_tag_list(char *section)
{
        struct conf_list *list = 0;
        struct conf_list_node *node = 0;
        struct conf_binding *cb;

        list = malloc(sizeof *list);
        if (!list)
                goto cleanup;
        TAILQ_INIT(&list->fields);
        list->cnt = 0;
        for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
            cb = LIST_NEXT(cb, link))
                if (strcasecmp(section, cb->section) == 0) {
                        list->cnt++;
                        node = calloc(1, sizeof *node);
                        if (!node)
                                goto cleanup;
                        node->field = strdup(cb->tag);
                        if (!node->field)
                                goto cleanup;
                        TAILQ_INSERT_TAIL(&list->fields, node, link);
                }
        return list;

cleanup:
        free(node);
        if (list)
                conf_free_list(list);
        return 0;
}

void
conf_free_list(struct conf_list *list)
{
        struct conf_list_node *node = TAILQ_FIRST(&list->fields);

        while (node) {
                TAILQ_REMOVE(&list->fields, node, link);
                free(node->field);
                free(node);
                node = TAILQ_FIRST(&list->fields);
        }
        free(list);
}

int
conf_begin(void)
{
        static int      seq = 0;

        return ++seq;
}

static int
conf_trans_node(int transaction, enum conf_op op, char *section, char *tag,
    char *value, int override, int is_default)
{
        struct conf_trans *node;

        node = calloc(1, sizeof *node);
        if (!node) {
                log_error("conf_trans_node: calloc (1, %lu) failed",
                    (unsigned long)sizeof *node);
                return 1;
        }
        node->trans = transaction;
        node->op = op;
        node->override = override;
        node->is_default = is_default;
        if (section && (node->section = strdup(section)) == NULL)
                goto fail;
        if (tag && (node->tag = strdup(tag)) == NULL)
                goto fail;
        if (value && (node->value = strdup(value)) == NULL)
                goto fail;
        TAILQ_INSERT_TAIL(&conf_trans_queue, node, link);
        return 0;

fail:
        free(node->section);
        free(node->tag);
        free(node->value);
        free(node);
        return 1;
}

/* Queue a set operation.  */
int
conf_set(int transaction, char *section, char *tag, char *value, int override,
    int is_default)
{
        return conf_trans_node(transaction, CONF_SET, section, tag, value,
            override, is_default);
}

/* Queue a remove operation.  */
int
conf_remove(int transaction, char *section, char *tag)
{
        return conf_trans_node(transaction, CONF_REMOVE, section, tag, NULL,
            0, 0);
}

/* Queue a remove section operation.  */
int
conf_remove_section(int transaction, char *section)
{
        return conf_trans_node(transaction, CONF_REMOVE_SECTION, section, NULL,
            NULL, 0, 0);
}

/* Execute all queued operations for this transaction.  Cleanup.  */
int
conf_end(int transaction, int commit)
{
        struct conf_trans *node, *next;

        for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
                next = TAILQ_NEXT(node, link);
                if (node->trans == transaction) {
                        if (commit)
                                switch (node->op) {
                                case CONF_SET:
                                        conf_set_now(node->section, node->tag,
                                            node->value, node->override,
                                            node->is_default);
                                        break;
                                case CONF_REMOVE:
                                        conf_remove_now(node->section,
                                            node->tag);
                                        break;
                                case CONF_REMOVE_SECTION:
                                        conf_remove_section_now(node->section);
                                        break;
                                default:
                                        log_print("conf_end: unknown "
                                            "operation: %d", node->op);
                                }
                        TAILQ_REMOVE(&conf_trans_queue, node, link);
                        free(node->section);
                        free(node->tag);
                        free(node->value);
                        free(node);
                }
        }
        return 0;
}

/*
 * Dump running configuration upon SIGUSR1.
 * Configuration is "stored in reverse order", so reverse it again.
 */
struct dumper {
        char    *s, *v;
        struct dumper *next;
};

static void
conf_report_dump(struct dumper *node)
{
        /* Recursive, cleanup when we're done.  */

        if (node->next)
                conf_report_dump(node->next);

        if (node->v)
                LOG_DBG((LOG_REPORT, 0, "%s=\t%s", node->s, node->v));
        else if (node->s) {
                LOG_DBG((LOG_REPORT, 0, "%s", node->s));
                if (strlen(node->s) > 0)
                        free(node->s);
        }
        free(node);
}

void
conf_report(void)
{
        struct conf_binding *cb, *last = 0;
        unsigned int    i;
        char           *current_section = NULL;
        struct dumper  *dumper, *dnode;

        dumper = dnode = calloc(1, sizeof *dumper);
        if (!dumper)
                goto mem_fail;

        LOG_DBG((LOG_REPORT, 0, "conf_report: dumping running configuration"));

        for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
                for (cb = LIST_FIRST(&conf_bindings[i]); cb;
                    cb = LIST_NEXT(cb, link)) {
                        if (!cb->is_default) {
                                /* Dump this entry.  */
                                if (!current_section || strcmp(cb->section,
                                    current_section)) {
                                        if (current_section) {
                                                if (asprintf(&dnode->s, "[%s]",
                                                    current_section) == -1)
                                                        goto mem_fail;
                                                dnode->next = calloc(1,
                                                    sizeof(struct dumper));
                                                dnode = dnode->next;
                                                if (!dnode)
                                                        goto mem_fail;

                                                dnode->s = "";
                                                dnode->next = calloc(1,
                                                    sizeof(struct dumper));
                                                dnode = dnode->next;
                                                if (!dnode)
                                                        goto mem_fail;
                                        }
                                        current_section = cb->section;
                                }
                                dnode->s = cb->tag;
                                dnode->v = cb->value;
                                dnode->next = calloc(1, sizeof(struct dumper));
                                dnode = dnode->next;
                                if (!dnode)
                                        goto mem_fail;
                                last = cb;
                        }
                }

        if (last)
                if (asprintf(&dnode->s, "[%s]", last->section) == -1)
                        goto mem_fail;
        conf_report_dump(dumper);

        return;

mem_fail:
        log_error("conf_report: malloc/calloc failed");
        while ((dnode = dumper) != 0) {
                dumper = dumper->next;
                free(dnode->s);
                free(dnode);
        }
}