summaryrefslogtreecommitdiff
path: root/libxtables/xtoptions.c
diff options
context:
space:
mode:
Diffstat (limited to 'libxtables/xtoptions.c')
-rw-r--r--libxtables/xtoptions.c1204
1 files changed, 1204 insertions, 0 deletions
diff --git a/libxtables/xtoptions.c b/libxtables/xtoptions.c
new file mode 100644
index 0000000..78e9abd
--- /dev/null
+++ b/libxtables/xtoptions.c
@@ -0,0 +1,1204 @@
+/*
+ * Argument parser
+ * Copyright © Jan Engelhardt, 2011
+ *
+ * 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.
+ */
+#include <ctype.h>
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <netdb.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <arpa/inet.h>
+#include <netinet/ip.h>
+#include "xtables.h"
+#include "xshared.h"
+#ifndef IPTOS_NORMALSVC
+# define IPTOS_NORMALSVC 0
+#endif
+
+#define XTOPT_MKPTR(cb) \
+ ((void *)((char *)(cb)->data + (cb)->entry->ptroff))
+
+/**
+ * Simple key-value pairs for syslog levels
+ */
+struct syslog_level {
+ char name[8];
+ uint8_t level;
+};
+
+struct tos_value_mask {
+ uint8_t value, mask;
+};
+
+static const size_t xtopt_psize[] = {
+ /*
+ * All types not listed here, and thus essentially being initialized to
+ * zero have zero on purpose.
+ */
+ [XTTYPE_UINT8] = sizeof(uint8_t),
+ [XTTYPE_UINT16] = sizeof(uint16_t),
+ [XTTYPE_UINT32] = sizeof(uint32_t),
+ [XTTYPE_UINT64] = sizeof(uint64_t),
+ [XTTYPE_UINT8RC] = sizeof(uint8_t[2]),
+ [XTTYPE_UINT16RC] = sizeof(uint16_t[2]),
+ [XTTYPE_UINT32RC] = sizeof(uint32_t[2]),
+ [XTTYPE_UINT64RC] = sizeof(uint64_t[2]),
+ [XTTYPE_DOUBLE] = sizeof(double),
+ [XTTYPE_STRING] = -1,
+ [XTTYPE_SYSLOGLEVEL] = sizeof(uint8_t),
+ [XTTYPE_HOST] = sizeof(union nf_inet_addr),
+ [XTTYPE_HOSTMASK] = sizeof(union nf_inet_addr),
+ [XTTYPE_PROTOCOL] = sizeof(uint8_t),
+ [XTTYPE_PORT] = sizeof(uint16_t),
+ [XTTYPE_PORTRC] = sizeof(uint16_t[2]),
+ [XTTYPE_PLENMASK] = sizeof(union nf_inet_addr),
+ [XTTYPE_ETHERMAC] = sizeof(uint8_t[6]),
+};
+
+/**
+ * Creates getopt options from the x6-style option map, and assigns each a
+ * getopt id.
+ */
+struct option *
+xtables_options_xfrm(struct option *orig_opts, struct option *oldopts,
+ const struct xt_option_entry *entry, unsigned int *offset)
+{
+ unsigned int num_orig, num_old = 0, num_new, i;
+ struct option *merge, *mp;
+
+ if (entry == NULL)
+ return oldopts;
+ for (num_orig = 0; orig_opts[num_orig].name != NULL; ++num_orig)
+ ;
+ if (oldopts != NULL)
+ for (num_old = 0; oldopts[num_old].name != NULL; ++num_old)
+ ;
+ for (num_new = 0; entry[num_new].name != NULL; ++num_new)
+ ;
+
+ /*
+ * Since @oldopts also has @orig_opts already (and does so at the
+ * start), skip these entries.
+ */
+ oldopts += num_orig;
+ num_old -= num_orig;
+
+ merge = malloc(sizeof(*mp) * (num_orig + num_old + num_new + 1));
+ if (merge == NULL)
+ return NULL;
+
+ /* Let the base options -[ADI...] have precedence over everything */
+ memcpy(merge, orig_opts, sizeof(*mp) * num_orig);
+ mp = merge + num_orig;
+
+ /* Second, the new options */
+ xt_params->option_offset += XT_OPTION_OFFSET_SCALE;
+ *offset = xt_params->option_offset;
+
+ for (i = 0; i < num_new; ++i, ++mp, ++entry) {
+ mp->name = entry->name;
+ mp->has_arg = entry->type != XTTYPE_NONE;
+ mp->flag = NULL;
+ mp->val = entry->id + *offset;
+ }
+
+ /* Third, the old options */
+ memcpy(mp, oldopts, sizeof(*mp) * num_old);
+ mp += num_old;
+ xtables_free_opts(0);
+
+ /* Clear trailing entry */
+ memset(mp, 0, sizeof(*mp));
+ return merge;
+}
+
+/**
+ * Give the upper limit for a certain type.
+ */
+static uintmax_t xtopt_max_by_type(enum xt_option_type type)
+{
+ switch (type) {
+ case XTTYPE_UINT8:
+ case XTTYPE_UINT8RC:
+ return UINT8_MAX;
+ case XTTYPE_UINT16:
+ case XTTYPE_UINT16RC:
+ return UINT16_MAX;
+ case XTTYPE_UINT32:
+ case XTTYPE_UINT32RC:
+ return UINT32_MAX;
+ case XTTYPE_UINT64:
+ case XTTYPE_UINT64RC:
+ return UINT64_MAX;
+ default:
+ return 0;
+ }
+}
+
+/**
+ * Return the size of a single entity based upon a type - predominantly an
+ * XTTYPE_UINT*RC type.
+ */
+static size_t xtopt_esize_by_type(enum xt_option_type type)
+{
+ switch (type) {
+ case XTTYPE_UINT8RC:
+ return xtopt_psize[XTTYPE_UINT8];
+ case XTTYPE_UINT16RC:
+ return xtopt_psize[XTTYPE_UINT16];
+ case XTTYPE_UINT32RC:
+ return xtopt_psize[XTTYPE_UINT32];
+ case XTTYPE_UINT64RC:
+ return xtopt_psize[XTTYPE_UINT64];
+ default:
+ return xtopt_psize[type];
+ }
+}
+
+/**
+ * Require a simple integer.
+ */
+static void xtopt_parse_int(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ uintmax_t lmin = 0, lmax = xtopt_max_by_type(entry->type);
+ uintmax_t value;
+
+ if (cb->entry->min != 0)
+ lmin = cb->entry->min;
+ if (cb->entry->max != 0)
+ lmax = cb->entry->max;
+
+ if (!xtables_strtoul(cb->arg, NULL, &value, lmin, lmax))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: bad value for option \"--%s\", "
+ "or out of range (%ju-%ju).\n",
+ cb->ext_name, entry->name, lmin, lmax);
+
+ if (entry->type == XTTYPE_UINT8) {
+ cb->val.u8 = value;
+ if (entry->flags & XTOPT_PUT)
+ *(uint8_t *)XTOPT_MKPTR(cb) = cb->val.u8;
+ } else if (entry->type == XTTYPE_UINT16) {
+ cb->val.u16 = value;
+ if (entry->flags & XTOPT_PUT)
+ *(uint16_t *)XTOPT_MKPTR(cb) = cb->val.u16;
+ } else if (entry->type == XTTYPE_UINT32) {
+ cb->val.u32 = value;
+ if (entry->flags & XTOPT_PUT)
+ *(uint32_t *)XTOPT_MKPTR(cb) = cb->val.u32;
+ } else if (entry->type == XTTYPE_UINT64) {
+ cb->val.u64 = value;
+ if (entry->flags & XTOPT_PUT)
+ *(uint64_t *)XTOPT_MKPTR(cb) = cb->val.u64;
+ }
+}
+
+/**
+ * Require a simple floating point number.
+ */
+static void xtopt_parse_float(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ double value;
+ char *end;
+
+ value = strtod(cb->arg, &end);
+ if (end == cb->arg || *end != '\0' ||
+ (entry->min != entry->max &&
+ (value < entry->min || value > entry->max)))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: bad value for option \"--%s\", "
+ "or out of range (%u-%u).\n",
+ cb->ext_name, entry->name, entry->min, entry->max);
+
+ cb->val.dbl = value;
+ if (entry->flags & XTOPT_PUT)
+ *(double *)XTOPT_MKPTR(cb) = cb->val.dbl;
+}
+
+/**
+ * Copy the parsed value to the appropriate entry in cb->val.
+ */
+static void xtopt_mint_value_to_cb(struct xt_option_call *cb, uintmax_t value)
+{
+ const struct xt_option_entry *entry = cb->entry;
+
+ if (cb->nvals >= ARRAY_SIZE(cb->val.u32_range))
+ return;
+ if (entry->type == XTTYPE_UINT8RC)
+ cb->val.u8_range[cb->nvals] = value;
+ else if (entry->type == XTTYPE_UINT16RC)
+ cb->val.u16_range[cb->nvals] = value;
+ else if (entry->type == XTTYPE_UINT32RC)
+ cb->val.u32_range[cb->nvals] = value;
+ else if (entry->type == XTTYPE_UINT64RC)
+ cb->val.u64_range[cb->nvals] = value;
+}
+
+/**
+ * Copy the parsed value to the data area, using appropriate type access.
+ */
+static void xtopt_mint_value_to_ptr(struct xt_option_call *cb, void **datap,
+ uintmax_t value)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ void *data = *datap;
+
+ if (!(entry->flags & XTOPT_PUT))
+ return;
+ if (entry->type == XTTYPE_UINT8RC)
+ *(uint8_t *)data = value;
+ else if (entry->type == XTTYPE_UINT16RC)
+ *(uint16_t *)data = value;
+ else if (entry->type == XTTYPE_UINT32RC)
+ *(uint32_t *)data = value;
+ else if (entry->type == XTTYPE_UINT64RC)
+ *(uint64_t *)data = value;
+ data += xtopt_esize_by_type(entry->type);
+ *datap = data;
+}
+
+/**
+ * Multiple integer parse routine.
+ *
+ * This function is capable of parsing any number of fields. Only the first
+ * two values from the string will be put into @cb however (and as such,
+ * @cb->val.uXX_range is just that large) to cater for the few extensions that
+ * do not have a range[2] field, but {min, max}, and which cannot use
+ * XTOPT_POINTER.
+ */
+static void xtopt_parse_mint(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ const char *arg = cb->arg;
+ size_t esize = xtopt_esize_by_type(entry->type);
+ const uintmax_t lmax = xtopt_max_by_type(entry->type);
+ void *put = XTOPT_MKPTR(cb);
+ unsigned int maxiter;
+ uintmax_t value;
+ char *end = "";
+ char sep = ':';
+
+ maxiter = entry->size / esize;
+ if (maxiter == 0)
+ maxiter = ARRAY_SIZE(cb->val.u32_range);
+ if (entry->size % esize != 0)
+ xt_params->exit_err(OTHER_PROBLEM, "%s: memory block does "
+ "not have proper size\n", __func__);
+
+ cb->nvals = 0;
+ for (arg = cb->arg, end = (char *)arg; ; arg = end + 1) {
+ if (cb->nvals == maxiter)
+ xt_params->exit_err(PARAMETER_PROBLEM, "%s: Too many "
+ "components for option \"--%s\" (max: %u)\n",
+ cb->ext_name, entry->name, maxiter);
+ if (*arg == '\0' || *arg == sep) {
+ /* Default range components when field not spec'd. */
+ end = (char *)arg;
+ value = (cb->nvals == 1) ? lmax : 0;
+ } else {
+ if (!xtables_strtoul(arg, &end, &value, 0, lmax))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: bad value for option \"--%s\" near "
+ "\"%s\", or out of range (0-%ju).\n",
+ cb->ext_name, entry->name, arg, lmax);
+ if (*end != '\0' && *end != sep)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: Argument to \"--%s\" has "
+ "unexpected characters near \"%s\".\n",
+ cb->ext_name, entry->name, end);
+ }
+ xtopt_mint_value_to_cb(cb, value);
+ ++cb->nvals;
+ xtopt_mint_value_to_ptr(cb, &put, value);
+ if (*end == '\0')
+ break;
+ }
+}
+
+static void xtopt_parse_string(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ size_t z = strlen(cb->arg);
+ char *p;
+
+ if (entry->min != 0 && z < entry->min)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "Argument must have a minimum length of "
+ "%u characters\n", entry->min);
+ if (entry->max != 0 && z > entry->max)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "Argument must have a maximum length of "
+ "%u characters\n", entry->max);
+ if (!(entry->flags & XTOPT_PUT))
+ return;
+ if (z >= entry->size)
+ z = entry->size - 1;
+ p = XTOPT_MKPTR(cb);
+ strncpy(p, cb->arg, z);
+ p[z] = '\0';
+}
+
+static const struct tos_symbol_info {
+ unsigned char value;
+ const char *name;
+} tos_symbol_names[] = {
+ {IPTOS_LOWDELAY, "Minimize-Delay"},
+ {IPTOS_THROUGHPUT, "Maximize-Throughput"},
+ {IPTOS_RELIABILITY, "Maximize-Reliability"},
+ {IPTOS_MINCOST, "Minimize-Cost"},
+ {IPTOS_NORMALSVC, "Normal-Service"},
+ {},
+};
+
+/*
+ * tos_parse_numeric - parse a string like "15/255"
+ *
+ * @str: input string
+ * @tvm: (value/mask) tuple
+ * @max: maximum allowed value (must be pow(2,some_int)-1)
+ */
+static bool tos_parse_numeric(const char *str, struct xt_option_call *cb,
+ unsigned int max)
+{
+ unsigned int value;
+ char *end;
+
+ xtables_strtoui(str, &end, &value, 0, max);
+ cb->val.tos_value = value;
+ cb->val.tos_mask = max;
+
+ if (*end == '/') {
+ const char *p = end + 1;
+
+ if (!xtables_strtoui(p, &end, &value, 0, max))
+ xtables_error(PARAMETER_PROBLEM, "Illegal value: \"%s\"",
+ str);
+ cb->val.tos_mask = value;
+ }
+
+ if (*end != '\0')
+ xtables_error(PARAMETER_PROBLEM, "Illegal value: \"%s\"", str);
+ return true;
+}
+
+/**
+ * @str: input string
+ * @tvm: (value/mask) tuple
+ * @def_mask: mask to force when a symbolic name is used
+ */
+static void xtopt_parse_tosmask(struct xt_option_call *cb)
+{
+ const struct tos_symbol_info *symbol;
+ char *tmp;
+
+ if (xtables_strtoui(cb->arg, &tmp, NULL, 0, UINT8_MAX)) {
+ tos_parse_numeric(cb->arg, cb, UINT8_MAX);
+ return;
+ }
+ /*
+ * This is our way we deal with different defaults
+ * for different revisions.
+ */
+ cb->val.tos_mask = cb->entry->max;
+ for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
+ if (strcasecmp(cb->arg, symbol->name) == 0) {
+ cb->val.tos_value = symbol->value;
+ return;
+ }
+
+ xtables_error(PARAMETER_PROBLEM, "Symbolic name \"%s\" is unknown",
+ cb->arg);
+}
+
+/**
+ * Validate the input for being conformant to "mark[/mask]".
+ */
+static void xtopt_parse_markmask(struct xt_option_call *cb)
+{
+ unsigned int mark = 0, mask = ~0U;
+ char *end;
+
+ if (!xtables_strtoui(cb->arg, &end, &mark, 0, UINT32_MAX))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: bad mark value for option \"--%s\", "
+ "or out of range.\n",
+ cb->ext_name, cb->entry->name);
+ if (*end == '/' &&
+ !xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: bad mask value for option \"--%s\", "
+ "or out of range.\n",
+ cb->ext_name, cb->entry->name);
+ if (*end != '\0')
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: trailing garbage after value "
+ "for option \"--%s\".\n",
+ cb->ext_name, cb->entry->name);
+ cb->val.mark = mark;
+ cb->val.mask = mask;
+}
+
+static int xtopt_sysloglvl_compare(const void *a, const void *b)
+{
+ const char *name = a;
+ const struct syslog_level *entry = b;
+
+ return strcmp(name, entry->name);
+}
+
+static void xtopt_parse_sysloglevel(struct xt_option_call *cb)
+{
+ static const struct syslog_level log_names[] = { /* must be sorted */
+ {"alert", LOG_ALERT},
+ {"crit", LOG_CRIT},
+ {"debug", LOG_DEBUG},
+ {"emerg", LOG_EMERG},
+ {"error", LOG_ERR}, /* deprecated */
+ {"info", LOG_INFO},
+ {"notice", LOG_NOTICE},
+ {"panic", LOG_EMERG}, /* deprecated */
+ {"warning", LOG_WARNING},
+ };
+ const struct syslog_level *e;
+ unsigned int num = 0;
+
+ if (!xtables_strtoui(cb->arg, NULL, &num, 0, 7)) {
+ e = bsearch(cb->arg, log_names, ARRAY_SIZE(log_names),
+ sizeof(*log_names), xtopt_sysloglvl_compare);
+ if (e == NULL)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "log level \"%s\" unknown\n", cb->arg);
+ num = e->level;
+ }
+ cb->val.syslog_level = num;
+ if (cb->entry->flags & XTOPT_PUT)
+ *(uint8_t *)XTOPT_MKPTR(cb) = num;
+}
+
+static void *xtables_sa_host(const void *sa, unsigned int afproto)
+{
+ if (afproto == AF_INET6)
+ return &((struct sockaddr_in6 *)sa)->sin6_addr;
+ else if (afproto == AF_INET)
+ return &((struct sockaddr_in *)sa)->sin_addr;
+ return (void *)sa;
+}
+
+static socklen_t xtables_sa_hostlen(unsigned int afproto)
+{
+ if (afproto == AF_INET6)
+ return sizeof(struct in6_addr);
+ else if (afproto == AF_INET)
+ return sizeof(struct in_addr);
+ return 0;
+}
+
+/**
+ * Accepts: a hostname (DNS), or a single inetaddr - without any mask. The
+ * result is stored in @cb->val.haddr. Additionally, @cb->val.hmask and
+ * @cb->val.hlen are set for completeness to the appropriate values.
+ */
+static void xtopt_parse_host(struct xt_option_call *cb)
+{
+ struct addrinfo hints = {.ai_family = afinfo->family};
+ unsigned int adcount = 0;
+ struct addrinfo *res, *p;
+ int ret;
+
+ ret = getaddrinfo(cb->arg, NULL, &hints, &res);
+ if (ret < 0)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "getaddrinfo: %s\n", gai_strerror(ret));
+
+ memset(&cb->val.hmask, 0xFF, sizeof(cb->val.hmask));
+ cb->val.hlen = (afinfo->family == NFPROTO_IPV4) ? 32 : 128;
+
+ for (p = res; p != NULL; p = p->ai_next) {
+ if (adcount == 0) {
+ memset(&cb->val.haddr, 0, sizeof(cb->val.haddr));
+ memcpy(&cb->val.haddr,
+ xtables_sa_host(p->ai_addr, p->ai_family),
+ xtables_sa_hostlen(p->ai_family));
+ ++adcount;
+ continue;
+ }
+ if (memcmp(&cb->val.haddr,
+ xtables_sa_host(p->ai_addr, p->ai_family),
+ xtables_sa_hostlen(p->ai_family)) != 0)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s resolves to more than one address\n",
+ cb->arg);
+ }
+
+ freeaddrinfo(res);
+ if (cb->entry->flags & XTOPT_PUT)
+ /* Validation in xtables_option_metavalidate */
+ memcpy(XTOPT_MKPTR(cb), &cb->val.haddr,
+ sizeof(cb->val.haddr));
+}
+
+/**
+ * @name: port name, or number as a string (e.g. "http" or "80")
+ *
+ * Resolve a port name to a number. Returns the port number in integral
+ * form on success, or <0 on error. (errno will not be set.)
+ */
+static int xtables_getportbyname(const char *name)
+{
+ struct addrinfo *res = NULL, *p;
+ int ret;
+
+ ret = getaddrinfo(NULL, name, NULL, &res);
+ if (ret < 0)
+ return -1;
+ ret = -1;
+ for (p = res; p != NULL; p = p->ai_next) {
+ if (p->ai_family == AF_INET6) {
+ ret = ((struct sockaddr_in6 *)p->ai_addr)->sin6_port;
+ break;
+ } else if (p->ai_family == AF_INET) {
+ ret = ((struct sockaddr_in *)p->ai_addr)->sin_port;
+ break;
+ }
+ }
+ freeaddrinfo(res);
+ if (ret < 0)
+ return ret;
+ return ntohs(ret);
+}
+
+/**
+ * Validate and parse a protocol specification (number or name) by use of
+ * /etc/protocols and put the result into @cb->val.protocol.
+ */
+static void xtopt_parse_protocol(struct xt_option_call *cb)
+{
+ cb->val.protocol = xtables_parse_protocol(cb->arg);
+ if (cb->entry->flags & XTOPT_PUT)
+ *(uint8_t *)XTOPT_MKPTR(cb) = cb->val.protocol;
+}
+
+/**
+ * Validate and parse a port specification and put the result into
+ * @cb->val.port.
+ */
+static void xtopt_parse_port(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ int ret;
+
+ ret = xtables_getportbyname(cb->arg);
+ if (ret < 0)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "Port \"%s\" does not resolve to anything.\n",
+ cb->arg);
+ if (entry->flags & XTOPT_NBO)
+ ret = htons(ret);
+ cb->val.port = ret;
+ if (entry->flags & XTOPT_PUT)
+ *(uint16_t *)XTOPT_MKPTR(cb) = cb->val.port;
+}
+
+static void xtopt_parse_mport(struct xt_option_call *cb)
+{
+ static const size_t esize = sizeof(uint16_t);
+ const struct xt_option_entry *entry = cb->entry;
+ char *lo_arg, *wp_arg, *arg;
+ unsigned int maxiter;
+ int value;
+
+ wp_arg = lo_arg = strdup(cb->arg);
+ if (lo_arg == NULL)
+ xt_params->exit_err(RESOURCE_PROBLEM, "strdup");
+
+ maxiter = entry->size / esize;
+ if (maxiter == 0)
+ maxiter = 2; /* ARRAY_SIZE(cb->val.port_range) */
+ if (entry->size % esize != 0)
+ xt_params->exit_err(OTHER_PROBLEM, "%s: memory block does "
+ "not have proper size\n", __func__);
+
+ cb->val.port_range[0] = 0;
+ cb->val.port_range[1] = UINT16_MAX;
+ cb->nvals = 0;
+
+ while ((arg = strsep(&wp_arg, ":")) != NULL) {
+ if (cb->nvals == maxiter)
+ xt_params->exit_err(PARAMETER_PROBLEM, "%s: Too many "
+ "components for option \"--%s\" (max: %u)\n",
+ cb->ext_name, entry->name, maxiter);
+ if (*arg == '\0') {
+ ++cb->nvals;
+ continue;
+ }
+
+ value = xtables_getportbyname(arg);
+ if (value < 0)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "Port \"%s\" does not resolve to "
+ "anything.\n", arg);
+ if (entry->flags & XTOPT_NBO)
+ value = htons(value);
+ if (cb->nvals < ARRAY_SIZE(cb->val.port_range))
+ cb->val.port_range[cb->nvals] = value;
+ ++cb->nvals;
+ }
+
+ if (cb->nvals == 1) {
+ cb->val.port_range[1] = cb->val.port_range[0];
+ ++cb->nvals;
+ }
+ if (entry->flags & XTOPT_PUT)
+ memcpy(XTOPT_MKPTR(cb), cb->val.port_range, sizeof(uint16_t) *
+ (cb->nvals <= maxiter ? cb->nvals : maxiter));
+ free(lo_arg);
+}
+
+static int xtopt_parse_mask(struct xt_option_call *cb)
+{
+ struct addrinfo hints = {.ai_family = afinfo->family,
+ .ai_flags = AI_NUMERICHOST };
+ struct addrinfo *res;
+ int ret;
+
+ ret = getaddrinfo(cb->arg, NULL, &hints, &res);
+ if (ret < 0)
+ return 0;
+
+ memcpy(&cb->val.hmask, xtables_sa_host(res->ai_addr, res->ai_family),
+ xtables_sa_hostlen(res->ai_family));
+
+ switch(afinfo->family) {
+ case AF_INET:
+ cb->val.hlen = xtables_ipmask_to_cidr(&cb->val.hmask.in);
+ break;
+ case AF_INET6:
+ cb->val.hlen = xtables_ip6mask_to_cidr(&cb->val.hmask.in6);
+ break;
+ }
+
+ freeaddrinfo(res);
+ return 1;
+}
+
+/**
+ * Parse an integer and ensure it is within the address family's prefix length
+ * limits. The result is stored in @cb->val.hlen.
+ */
+static void xtopt_parse_plen(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ unsigned int prefix_len = 128; /* happiness is a warm gcc */
+
+ cb->val.hlen = (afinfo->family == NFPROTO_IPV4) ? 32 : 128;
+ if (!xtables_strtoui(cb->arg, NULL, &prefix_len, 0, cb->val.hlen)) {
+ /* Is this mask expressed in full format? e.g. 255.255.255.0 */
+ if (xtopt_parse_mask(cb))
+ return;
+
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: bad value for option \"--%s\", "
+ "neither a valid network mask "
+ "nor valid CIDR (%u-%u).\n",
+ cb->ext_name, entry->name, 0, cb->val.hlen);
+ }
+ cb->val.hlen = prefix_len;
+}
+
+/**
+ * Reuse xtopt_parse_plen for testing the integer. Afterwards convert this to
+ * a bitmask, and make it available through @cb->val.hmask (hlen remains
+ * valid). If %XTOPT_PUT is used, hmask will be copied to the target area.
+ */
+static void xtopt_parse_plenmask(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ uint32_t *mask = cb->val.hmask.all;
+
+ xtopt_parse_plen(cb);
+
+ memset(mask, 0xFF, sizeof(union nf_inet_addr));
+ /* This shifting is AF-independent. */
+ if (cb->val.hlen == 0) {
+ mask[0] = mask[1] = mask[2] = mask[3] = 0;
+ } else if (cb->val.hlen <= 32) {
+ mask[0] <<= 32 - cb->val.hlen;
+ mask[1] = mask[2] = mask[3] = 0;
+ } else if (cb->val.hlen <= 64) {
+ mask[1] <<= 32 - (cb->val.hlen - 32);
+ mask[2] = mask[3] = 0;
+ } else if (cb->val.hlen <= 96) {
+ mask[2] <<= 32 - (cb->val.hlen - 64);
+ mask[3] = 0;
+ } else if (cb->val.hlen <= 128) {
+ mask[3] <<= 32 - (cb->val.hlen - 96);
+ }
+ mask[0] = htonl(mask[0]);
+ mask[1] = htonl(mask[1]);
+ mask[2] = htonl(mask[2]);
+ mask[3] = htonl(mask[3]);
+ if (entry->flags & XTOPT_PUT)
+ memcpy(XTOPT_MKPTR(cb), mask, sizeof(union nf_inet_addr));
+}
+
+static void xtopt_parse_hostmask(struct xt_option_call *cb)
+{
+ const char *orig_arg = cb->arg;
+ char *work, *p;
+
+ if (strchr(cb->arg, '/') == NULL) {
+ xtopt_parse_host(cb);
+ return;
+ }
+ work = strdup(orig_arg);
+ if (work == NULL)
+ xt_params->exit_err(PARAMETER_PROBLEM, "strdup");
+ p = strchr(work, '/'); /* by def this can't be NULL now */
+ *p++ = '\0';
+ /*
+ * Because xtopt_parse_host and xtopt_parse_plenmask would store
+ * different things in the same target area, XTTYPE_HOSTMASK must
+ * disallow XTOPT_PUT, which it does by forcing its absence,
+ * cf. not being listed in xtopt_psize.
+ */
+ cb->arg = work;
+ xtopt_parse_host(cb);
+ cb->arg = p;
+ xtopt_parse_plenmask(cb);
+ cb->arg = orig_arg;
+}
+
+static void xtopt_parse_ethermac(struct xt_option_call *cb)
+{
+ const char *arg = cb->arg;
+ unsigned int i;
+ char *end;
+
+ for (i = 0; i < ARRAY_SIZE(cb->val.ethermac) - 1; ++i) {
+ cb->val.ethermac[i] = strtoul(arg, &end, 16);
+ if (*end != ':' || end - arg > 2)
+ goto out;
+ arg = end + 1;
+ }
+ i = ARRAY_SIZE(cb->val.ethermac) - 1;
+ cb->val.ethermac[i] = strtoul(arg, &end, 16);
+ if (*end != '\0' || end - arg > 2)
+ goto out;
+ if (cb->entry->flags & XTOPT_PUT)
+ memcpy(XTOPT_MKPTR(cb), cb->val.ethermac,
+ sizeof(cb->val.ethermac));
+ return;
+ out:
+ xt_params->exit_err(PARAMETER_PROBLEM, "ether");
+}
+
+static void (*const xtopt_subparse[])(struct xt_option_call *) = {
+ [XTTYPE_UINT8] = xtopt_parse_int,
+ [XTTYPE_UINT16] = xtopt_parse_int,
+ [XTTYPE_UINT32] = xtopt_parse_int,
+ [XTTYPE_UINT64] = xtopt_parse_int,
+ [XTTYPE_UINT8RC] = xtopt_parse_mint,
+ [XTTYPE_UINT16RC] = xtopt_parse_mint,
+ [XTTYPE_UINT32RC] = xtopt_parse_mint,
+ [XTTYPE_UINT64RC] = xtopt_parse_mint,
+ [XTTYPE_DOUBLE] = xtopt_parse_float,
+ [XTTYPE_STRING] = xtopt_parse_string,
+ [XTTYPE_TOSMASK] = xtopt_parse_tosmask,
+ [XTTYPE_MARKMASK32] = xtopt_parse_markmask,
+ [XTTYPE_SYSLOGLEVEL] = xtopt_parse_sysloglevel,
+ [XTTYPE_HOST] = xtopt_parse_host,
+ [XTTYPE_HOSTMASK] = xtopt_parse_hostmask,
+ [XTTYPE_PROTOCOL] = xtopt_parse_protocol,
+ [XTTYPE_PORT] = xtopt_parse_port,
+ [XTTYPE_PORTRC] = xtopt_parse_mport,
+ [XTTYPE_PLEN] = xtopt_parse_plen,
+ [XTTYPE_PLENMASK] = xtopt_parse_plenmask,
+ [XTTYPE_ETHERMAC] = xtopt_parse_ethermac,
+};
+
+/**
+ * The master option parsing routine. May be used for the ".x6_parse"
+ * function pointer in extensions if fully automatic parsing is desired.
+ * It may be also called manually from a custom x6_parse function.
+ */
+void xtables_option_parse(struct xt_option_call *cb)
+{
+ const struct xt_option_entry *entry = cb->entry;
+ unsigned int eflag = 1 << cb->entry->id;
+
+ /*
+ * With {.id = P_FOO, .excl = P_FOO} we can have simple double-use
+ * prevention. Though it turned out that this is too much typing (most
+ * of the options are one-time use only), so now we also have
+ * %XTOPT_MULTI.
+ */
+ if ((!(entry->flags & XTOPT_MULTI) || (entry->excl & eflag)) &&
+ cb->xflags & eflag)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: option \"--%s\" can only be used once.\n",
+ cb->ext_name, cb->entry->name);
+ if (cb->invert && !(entry->flags & XTOPT_INVERT))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: option \"--%s\" cannot be inverted.\n",
+ cb->ext_name, entry->name);
+ if (entry->type != XTTYPE_NONE && optarg == NULL)
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: option \"--%s\" requires an argument.\n",
+ cb->ext_name, entry->name);
+ /*
+ * Fill in fallback value for "nvals", in case an extension (as it
+ * happened with libxt_conntrack.2) tries to read it, despite not using
+ * a *RC option type.
+ */
+ cb->nvals = 1;
+ if (entry->type <= ARRAY_SIZE(xtopt_subparse) &&
+ xtopt_subparse[entry->type] != NULL)
+ xtopt_subparse[entry->type](cb);
+ /* Exclusion with other flags tested later in finalize. */
+ cb->xflags |= 1 << entry->id;
+}
+
+/**
+ * Verifies that an extension's option map descriptor is valid, and ought to
+ * be called right after the extension has been loaded, and before option
+ * merging/xfrm.
+ */
+void xtables_option_metavalidate(const char *name,
+ const struct xt_option_entry *entry)
+{
+ for (; entry->name != NULL; ++entry) {
+ if (entry->id >= CHAR_BIT * sizeof(unsigned int) ||
+ entry->id >= XT_OPTION_OFFSET_SCALE)
+ xt_params->exit_err(OTHER_PROBLEM,
+ "Extension %s uses invalid ID %u\n",
+ name, entry->id);
+ if (!(entry->flags & XTOPT_PUT)) {
+ if (entry->ptroff != 0)
+ xt_params->exit_err(OTHER_PROBLEM,
+ "%s: ptroff for \"--%s\" is non-"
+ "zero but no XTOPT_PUT is specified. "
+ "Oversight?", name, entry->name);
+ continue;
+ }
+ if (entry->type >= ARRAY_SIZE(xtopt_psize) ||
+ xtopt_psize[entry->type] == 0)
+ xt_params->exit_err(OTHER_PROBLEM,
+ "%s: entry type of option \"--%s\" cannot be "
+ "combined with XTOPT_PUT\n",
+ name, entry->name);
+ if (xtopt_psize[entry->type] != -1 &&
+ xtopt_psize[entry->type] != entry->size)
+ xt_params->exit_err(OTHER_PROBLEM,
+ "%s: option \"--%s\" points to a memory block "
+ "of wrong size (expected %zu, got %zu)\n",
+ name, entry->name,
+ xtopt_psize[entry->type], entry->size);
+ }
+}
+
+/**
+ * Find an option entry by its id.
+ */
+static const struct xt_option_entry *
+xtables_option_lookup(const struct xt_option_entry *entry, unsigned int id)
+{
+ for (; entry->name != NULL; ++entry)
+ if (entry->id == id)
+ return entry;
+ return NULL;
+}
+
+/**
+ * @c: getopt id (i.e. with offset)
+ * @fw: struct ipt_entry or ip6t_entry
+ *
+ * Dispatch arguments to the appropriate parse function, based upon the
+ * extension's choice of API.
+ */
+void xtables_option_tpcall(unsigned int c, char **argv, bool invert,
+ struct xtables_target *t, void *fw)
+{
+ struct xt_option_call cb;
+
+ if (t->x6_parse == NULL) {
+ if (t->parse != NULL)
+ t->parse(c - t->option_offset, argv, invert,
+ &t->tflags, fw, &t->t);
+ return;
+ }
+
+ c -= t->option_offset;
+ cb.entry = xtables_option_lookup(t->x6_options, c);
+ if (cb.entry == NULL)
+ xtables_error(OTHER_PROBLEM,
+ "Extension does not know id %u\n", c);
+ cb.arg = optarg;
+ cb.invert = invert;
+ cb.ext_name = t->name;
+ cb.data = t->t->data;
+ cb.xflags = t->tflags;
+ cb.target = &t->t;
+ cb.xt_entry = fw;
+ cb.udata = t->udata;
+ t->x6_parse(&cb);
+ t->tflags = cb.xflags;
+}
+
+/**
+ * @c: getopt id (i.e. with offset)
+ * @fw: struct ipt_entry or ip6t_entry
+ *
+ * Dispatch arguments to the appropriate parse function, based upon the
+ * extension's choice of API.
+ */
+void xtables_option_mpcall(unsigned int c, char **argv, bool invert,
+ struct xtables_match *m, void *fw)
+{
+ struct xt_option_call cb;
+
+ if (m->x6_parse == NULL) {
+ if (m->parse != NULL)
+ m->parse(c - m->option_offset, argv, invert,
+ &m->mflags, fw, &m->m);
+ return;
+ }
+
+ c -= m->option_offset;
+ cb.entry = xtables_option_lookup(m->x6_options, c);
+ if (cb.entry == NULL)
+ xtables_error(OTHER_PROBLEM,
+ "Extension does not know id %u\n", c);
+ cb.arg = optarg;
+ cb.invert = invert;
+ cb.ext_name = m->name;
+ cb.data = m->m->data;
+ cb.xflags = m->mflags;
+ cb.match = &m->m;
+ cb.xt_entry = fw;
+ cb.udata = m->udata;
+ m->x6_parse(&cb);
+ m->mflags = cb.xflags;
+}
+
+/**
+ * @name: name of extension
+ * @entry: current option (from all ext's entries) being validated
+ * @xflags: flags the extension has collected
+ * @i: conflicting option (id) to test for
+ */
+static void
+xtables_option_fcheck2(const char *name, const struct xt_option_entry *entry,
+ const struct xt_option_entry *other,
+ unsigned int xflags)
+{
+ unsigned int ef = 1 << entry->id, of = 1 << other->id;
+
+ if (entry->also & of && !(xflags & of))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: option \"--%s\" also requires \"--%s\".\n",
+ name, entry->name, other->name);
+
+ if (!(entry->excl & of))
+ /* Use of entry does not collide with other option, good. */
+ return;
+ if ((xflags & (ef | of)) != (ef | of))
+ /* Conflicting options were not used. */
+ return;
+
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: option \"--%s\" cannot be used together with \"--%s\".\n",
+ name, entry->name, other->name);
+}
+
+/**
+ * @name: name of extension
+ * @xflags: accumulated flags
+ * @entry: extension's option table
+ *
+ * Check that all option constraints have been met. This effectively replaces
+ * ->final_check of the older API.
+ */
+void xtables_options_fcheck(const char *name, unsigned int xflags,
+ const struct xt_option_entry *table)
+{
+ const struct xt_option_entry *entry, *other;
+ unsigned int i;
+
+ for (entry = table; entry->name != NULL; ++entry) {
+ if (entry->flags & XTOPT_MAND &&
+ !(xflags & (1 << entry->id)))
+ xt_params->exit_err(PARAMETER_PROBLEM,
+ "%s: option \"--%s\" must be specified\n",
+ name, entry->name);
+ if (!(xflags & (1 << entry->id)))
+ /* Not required, not specified, thus skip. */
+ continue;
+
+ for (i = 0; i < CHAR_BIT * sizeof(entry->id); ++i) {
+ if (entry->id == i)
+ /*
+ * Avoid conflict with self. Multi-use check
+ * was done earlier in xtables_option_parse.
+ */
+ continue;
+ other = xtables_option_lookup(table, i);
+ if (other == NULL)
+ continue;
+ xtables_option_fcheck2(name, entry, other, xflags);
+ }
+ }
+}
+
+/**
+ * Dispatch arguments to the appropriate final_check function, based upon the
+ * extension's choice of API.
+ */
+void xtables_option_tfcall(struct xtables_target *t)
+{
+ if (t->x6_fcheck != NULL) {
+ struct xt_fcheck_call cb;
+
+ cb.ext_name = t->name;
+ cb.data = t->t->data;
+ cb.xflags = t->tflags;
+ cb.udata = t->udata;
+ t->x6_fcheck(&cb);
+ } else if (t->final_check != NULL) {
+ t->final_check(t->tflags);
+ }
+ if (t->x6_options != NULL)
+ xtables_options_fcheck(t->name, t->tflags, t->x6_options);
+}
+
+/**
+ * Dispatch arguments to the appropriate final_check function, based upon the
+ * extension's choice of API.
+ */
+void xtables_option_mfcall(struct xtables_match *m)
+{
+ if (m->x6_fcheck != NULL) {
+ struct xt_fcheck_call cb;
+
+ cb.ext_name = m->name;
+ cb.data = m->m->data;
+ cb.xflags = m->mflags;
+ cb.udata = m->udata;
+ m->x6_fcheck(&cb);
+ } else if (m->final_check != NULL) {
+ m->final_check(m->mflags);
+ }
+ if (m->x6_options != NULL)
+ xtables_options_fcheck(m->name, m->mflags, m->x6_options);
+}
+
+struct xtables_lmap *xtables_lmap_init(const char *file)
+{
+ struct xtables_lmap *lmap_head = NULL, *lmap_prev = NULL, *lmap_this;
+ char buf[512];
+ FILE *fp;
+ char *cur, *nxt;
+ int id;
+
+ fp = fopen(file, "re");
+ if (fp == NULL)
+ return NULL;
+
+ while (fgets(buf, sizeof(buf), fp) != NULL) {
+ cur = buf;
+ while (isspace(*cur))
+ ++cur;
+ if (*cur == '#' || *cur == '\n' || *cur == '\0')
+ continue;
+
+ /* iproute2 allows hex and dec format */
+ errno = 0;
+ id = strtoul(cur, &nxt, strncmp(cur, "0x", 2) == 0 ? 16 : 10);
+ if (nxt == cur || errno != 0)
+ continue;
+
+ /* same boundaries as in iproute2 */
+ if (id < 0 || id > 255)
+ continue;
+ cur = nxt;
+
+ if (!isspace(*cur))
+ continue;
+ while (isspace(*cur))
+ ++cur;
+ if (*cur == '#' || *cur == '\n' || *cur == '\0')
+ continue;
+ nxt = cur;
+ while (*nxt != '\0' && !isspace(*nxt))
+ ++nxt;
+ if (nxt == cur)
+ continue;
+ *nxt = '\0';
+
+ /* found valid data */
+ lmap_this = malloc(sizeof(*lmap_this));
+ if (lmap_this == NULL) {
+ perror("malloc");
+ goto out;
+ }
+ lmap_this->id = id;
+ lmap_this->name = strdup(cur);
+ if (lmap_this->name == NULL) {
+ free(lmap_this);
+ goto out;
+ }
+ lmap_this->next = NULL;
+
+ if (lmap_prev != NULL)
+ lmap_prev->next = lmap_this;
+ else
+ lmap_head = lmap_this;
+ lmap_prev = lmap_this;
+ }
+
+ fclose(fp);
+ return lmap_head;
+ out:
+ fclose(fp);
+ xtables_lmap_free(lmap_head);
+ return NULL;
+}
+
+void xtables_lmap_free(struct xtables_lmap *head)
+{
+ struct xtables_lmap *next;
+
+ for (; head != NULL; head = next) {
+ next = head->next;
+ free(head->name);
+ free(head);
+ }
+}
+
+int xtables_lmap_name2id(const struct xtables_lmap *head, const char *name)
+{
+ for (; head != NULL; head = head->next)
+ if (strcmp(head->name, name) == 0)
+ return head->id;
+ return -1;
+}
+
+const char *xtables_lmap_id2name(const struct xtables_lmap *head, int id)
+{
+ for (; head != NULL; head = head->next)
+ if (head->id == id)
+ return head->name;
+ return NULL;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 07:13:54 +0000