--- /dev/null
+/*
+ * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <ctype.h>
+
+#include <arpa/inet.h>
+#include <netinet/ether.h>
+#include <sys/stat.h>
+
+#include "libvalidate.h"
+
+enum dt_optype {
+ OP_UNKNOWN,
+ OP_BOOL,
+ OP_NUMBER,
+ OP_STRING,
+ OP_FUNCTION
+};
+
+struct dt_fun;
+
+struct dt_op {
+ enum dt_optype type;
+ const char *next;
+ int length;
+ int nextop;
+ union {
+ bool boolean;
+ double number;
+ const char *string;
+ struct dt_fun *function;
+ } value;
+};
+
+struct dt_state {
+ int pos;
+ int depth;
+ const char *value;
+ struct dt_op stack[32];
+};
+
+struct dt_fun {
+ const char *name;
+ bool (*call)(struct dt_state *s, int nargs);
+};
+
+static bool
+dt_test_number(double number, const char *value)
+{
+ char *e;
+ double n;
+
+ n = strtod(value, &e);
+
+ return (e > value && *e == 0 && n == number);
+}
+
+static bool
+dt_test_string(const char *s, const char *end, const char *value)
+{
+ bool esc = false;
+
+ while (*value)
+ {
+ if (s > end)
+ return false;
+
+ if (!esc && *s == '\\')
+ {
+ s++;
+
+ if (s >= end)
+ break;
+
+ esc = true;
+ continue;
+ }
+
+ if (*s != *value)
+ return false;
+
+ esc = false;
+ value++;
+ s++;
+ }
+
+ return (*s == *value || (s > end && *value == 0));
+}
+
+static bool
+dt_step(struct dt_state *s);
+
+static bool
+dt_call(struct dt_state *s);
+
+static bool
+dt_type_or(struct dt_state *s, int nargs)
+{
+ while (nargs--)
+ if (dt_step(s))
+ return true;
+
+ return false;
+}
+
+static bool
+dt_type_and(struct dt_state *s, int nargs)
+{
+ while (nargs--)
+ if (!dt_step(s))
+ return false;
+
+ return true;
+}
+
+static bool
+dt_type_not(struct dt_state *s, int nargs)
+{
+ if (!nargs)
+ return false;
+
+ return !dt_step(s);
+}
+
+static bool
+dt_type_neg(struct dt_state *s, int nargs)
+{
+ bool rv;
+ const char *value = s->value;
+
+ if (!nargs)
+ return false;
+
+ if (*s->value == '!')
+ while (isspace(*++s->value));
+
+ rv = dt_step(s);
+ s->value = value;
+
+ return rv;
+}
+
+static bool
+dt_type_list(struct dt_state *s, int nargs)
+{
+ bool rv = true;
+ int pos = s->pos;
+ char *p, *str = strdup(s->value);
+ const char *value = s->value;
+
+ if (!str || !nargs)
+ return false;
+
+ for (p = strtok(str, " \t"); p; p = strtok(NULL, " \t"))
+ {
+ s->value = p;
+
+ if (!dt_step(s))
+ {
+ rv = false;
+ break;
+ }
+
+ s->pos = pos;
+ }
+
+ s->value = value;
+ free(str);
+
+ return rv;
+}
+
+static bool
+dt_type_min(struct dt_state *s, int nargs)
+{
+ int n;
+ char *e;
+
+ if (nargs >= 1 && s->stack[s->pos].type == OP_NUMBER)
+ {
+ n = strtol(s->value, &e, 0);
+
+ return (e > s->value && *e == 0 &&
+ n >= s->stack[s->pos].value.number);
+ }
+
+ return false;
+}
+
+static bool
+dt_type_max(struct dt_state *s, int nargs)
+{
+ int n;
+ char *e;
+
+ if (nargs >= 1 && s->stack[s->pos].type == OP_NUMBER)
+ {
+ n = strtol(s->value, &e, 0);
+
+ return (e > s->value && *e == 0 &&
+ n <= s->stack[s->pos].value.number);
+ }
+
+ return false;
+}
+
+static bool
+dt_type_range(struct dt_state *s, int nargs)
+{
+ int n;
+ char *e;
+
+ if (nargs >= 2 &&
+ s->stack[s->pos].type == OP_NUMBER &&
+ s->stack[s->pos + 1].type == OP_NUMBER)
+ {
+ n = strtol(s->value, &e, 0);
+
+ return (e > s->value && *e == 0 &&
+ n >= s->stack[s->pos].value.number &&
+ n <= s->stack[s->pos + 1].value.number);
+ }
+
+ return false;
+}
+
+static bool
+dt_type_minlen(struct dt_state *s, int nargs)
+{
+ if (nargs >= 1 && s->stack[s->pos].type == OP_NUMBER)
+ return (strlen(s->value) >= s->stack[s->pos].value.number);
+
+ return false;
+}
+
+static bool
+dt_type_maxlen(struct dt_state *s, int nargs)
+{
+ if (nargs >= 1 && s->stack[s->pos].type == OP_NUMBER)
+ return (strlen(s->value) <= s->stack[s->pos].value.number);
+
+ return false;
+}
+
+static bool
+dt_type_rangelen(struct dt_state *s, int nargs)
+{
+ if (nargs >= 2 &&
+ s->stack[s->pos].type == OP_NUMBER &&
+ s->stack[s->pos + 1].type == OP_NUMBER)
+ return (strlen(s->value) >= s->stack[s->pos].value.number &&
+ strlen(s->value) <= s->stack[s->pos + 1].value.number);
+
+ return false;
+}
+
+static bool
+dt_type_int(struct dt_state *s, int nargs)
+{
+ char *e;
+
+ strtol(s->value, &e, 0);
+
+ return (e > s->value && *e == 0);
+}
+
+static bool
+dt_type_uint(struct dt_state *s, int nargs)
+{
+ int n;
+ char *e;
+
+ n = strtol(s->value, &e, 0);
+
+ return (e > s->value && *e == 0 && n >= 0);
+}
+
+static bool
+dt_type_float(struct dt_state *s, int nargs)
+{
+ char *e;
+
+ strtod(s->value, &e);
+
+ return (e > s->value && *e == 0);
+}
+
+static bool
+dt_type_ufloat(struct dt_state *s, int nargs)
+{
+ int n;
+ char *e;
+
+ n = strtod(s->value, &e);
+
+ return (e > s->value && *e == 0 && n >= 0.0);
+}
+
+static bool
+dt_type_bool(struct dt_state *s, int nargs)
+{
+ int i;
+ const char *values[] = {
+ "0", "off", "false", "no",
+ "1", "on", "true", "yes"
+ };
+
+ for (i = 0; i < sizeof(values) / sizeof(values[0]); i++)
+ if (!strcasecmp(values[i], s->value))
+ return true;
+
+ return false;
+}
+
+static bool
+dt_type_string(struct dt_state *s, int nargs)
+{
+ return true;
+}
+
+static bool
+dt_type_ip4addr(struct dt_state *s, int nargs)
+{
+ struct in6_addr a;
+ return inet_pton(AF_INET, s->value, &a);
+}
+
+static bool
+dt_type_ip6addr(struct dt_state *s, int nargs)
+{
+ struct in6_addr a;
+ return inet_pton(AF_INET6, s->value, &a);
+}
+
+static bool
+dt_type_ipaddr(struct dt_state *s, int nargs)
+{
+ return (dt_type_ip4addr(s, 0) || dt_type_ip6addr(s, 0));
+}
+
+static bool
+dt_type_netmask4(struct dt_state *s, int nargs)
+{
+ int i;
+ struct in_addr a;
+
+ if (!inet_pton(AF_INET, s->value, &a))
+ return false;
+
+ if (a.s_addr == 0)
+ return true;
+
+ a.s_addr = ntohl(a.s_addr);
+
+ for (i = 0; (i < 32) && !(a.s_addr & (1 << i)); i++);
+
+ return ((uint32_t)(~((1 << i) - 1)) == a.s_addr);
+}
+
+static bool
+dt_type_netmask6(struct dt_state *s, int nargs)
+{
+ int i;
+ struct in6_addr a;
+
+ if (!inet_pton(AF_INET6, s->value, &a))
+ return false;
+
+ for (i = 0; (i < 16) && (a.s6_addr[i] == 0xFF); i++);
+
+ if (i == 16)
+ return true;
+
+ if ((a.s6_addr[i] != 255) && (a.s6_addr[i] != 254) &&
+ (a.s6_addr[i] != 252) && (a.s6_addr[i] != 248) &&
+ (a.s6_addr[i] != 240) && (a.s6_addr[i] != 224) &&
+ (a.s6_addr[i] != 192) && (a.s6_addr[i] != 128) &&
+ (a.s6_addr[i] != 0))
+ return false;
+
+ for (; (i < 16) && (a.s6_addr[i] == 0); i++);
+
+ return (i == 16);
+}
+
+static bool
+dt_type_cidr4(struct dt_state *s, int nargs)
+{
+ int n;
+ struct in_addr a;
+ char *p, buf[sizeof("255.255.255.255/32\0")];
+
+ if (strlen(s->value) >= sizeof(buf))
+ return false;
+
+ strcpy(buf, s->value);
+ p = strchr(buf, '/');
+
+ if (p)
+ {
+ *p++ = 0;
+
+ n = strtoul(p, &p, 10);
+
+ if ((*p != 0) || (n > 32))
+ return false;
+ }
+
+ return inet_pton(AF_INET, buf, &a);
+}
+
+static bool
+dt_type_cidr6(struct dt_state *s, int nargs)
+{
+ int n;
+ struct in6_addr a;
+ char *p, buf[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255/128\0")];
+
+ if (strlen(s->value) >= sizeof(buf))
+ return false;
+
+ strcpy(buf, s->value);
+ p = strchr(buf, '/');
+
+ if (p)
+ {
+ *p++ = 0;
+
+ n = strtoul(p, &p, 10);
+
+ if ((*p != 0) || (n > 128))
+ return false;
+ }
+
+ return inet_pton(AF_INET6, buf, &a);
+}
+
+static bool
+dt_type_cidr(struct dt_state *s, int nargs)
+{
+ return (dt_type_cidr4(s, 0) || dt_type_cidr6(s, 0));
+}
+
+static bool
+dt_type_ipmask4(struct dt_state *s, int nargs)
+{
+ bool rv;
+ struct in_addr a;
+ const char *value;
+ char *p, buf[sizeof("255.255.255.255/255.255.255.255\0")];
+
+ if (strlen(s->value) >= sizeof(buf))
+ return false;
+
+ strcpy(buf, s->value);
+ p = strchr(buf, '/');
+
+ if (p)
+ {
+ *p++ = 0;
+
+ value = s->value;
+ s->value = p;
+ rv = dt_type_netmask4(s, 0);
+ s->value = value;
+
+ if (!rv)
+ return false;
+ }
+
+ return inet_pton(AF_INET, buf, &a);
+}
+
+static bool
+dt_type_ipmask6(struct dt_state *s, int nargs)
+{
+ bool rv;
+ struct in6_addr a;
+ const char *value;
+ char *p, buf[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255/"
+ "FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255\0")];
+
+ if (strlen(s->value) >= sizeof(buf))
+ return false;
+
+ strcpy(buf, s->value);
+ p = strchr(buf, '/');
+
+ if (p)
+ {
+ *p++ = 0;
+
+ value = s->value;
+ s->value = p;
+ rv = dt_type_netmask6(s, 0);
+ s->value = value;
+
+ if (!rv)
+ return false;
+ }
+
+ return inet_pton(AF_INET6, buf, &a);
+}
+
+static bool
+dt_type_ipmask(struct dt_state *s, int nargs)
+{
+ return (dt_type_ipmask4(s, 0) || dt_type_ipmask6(s, 0));
+}
+
+static bool
+dt_type_port(struct dt_state *s, int nargs)
+{
+ int n;
+ char *e;
+
+ n = strtoul(s->value, &e, 10);
+
+ return (e > s->value && *e == 0 && n <= 65535);
+}
+
+static bool
+dt_type_portrange(struct dt_state *s, int nargs)
+{
+ int n, m;
+ char *e;
+
+ n = strtoul(s->value, &e, 10);
+
+ if (e == s->value || *e != '-')
+ return false;
+
+ m = strtoul(e + 1, &e, 10);
+
+ return (*e == 0 && n <= 65535 && m <= 65535 && n <= m);
+}
+
+static bool
+dt_type_macaddr(struct dt_state *s, int nargs)
+{
+ return !!ether_aton(s->value);
+}
+
+static bool
+dt_type_uciname(struct dt_state *s, int nargs)
+{
+ const char *p;
+
+ for (p = s->value;
+ *p && ((*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z') ||
+ (*p >= '0' && *p <= '9') || (*p == '_'));
+ p++);
+
+ return (*p == 0);
+}
+
+static bool
+dt_type_wpakey(struct dt_state *s, int nargs)
+{
+ int len = strlen(s->value);
+ const char *p = s->value;
+
+ if (len == 64)
+ {
+ while (isxdigit(*p))
+ p++;
+
+ return (*p == 0);
+ }
+
+ return (len >= 8 && len <= 63);
+}
+
+static bool
+dt_type_wepkey(struct dt_state *s, int nargs)
+{
+ int len = strlen(s->value);
+ const char *p = s->value;
+
+ if (!strncmp(p, "s:", 2))
+ {
+ len -= 2;
+ p += 2;
+ }
+
+ if (len == 10 || len == 26)
+ {
+ while (isxdigit(*p))
+ p++;
+
+ return (*p == 0);
+ }
+
+ return (len == 5 || len == 13);
+}
+
+static bool
+dt_type_hostname(struct dt_state *s, int nargs)
+{
+ const char *p, *last;
+
+ for (p = last = s->value; *p; p++)
+ {
+ if (*p == '.')
+ {
+ if ((p - last) == 0 || (p - last) > 63)
+ return false;
+
+ last = p + 1;
+ continue;
+ }
+ else if ((*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z') ||
+ (*p >= '0' && *p <= '9') || (*p == '_') || (*p == '-'))
+ {
+ continue;
+ }
+
+ return false;
+ }
+
+ return ((p - last) > 0 && (p - last) <= 255);
+}
+
+static bool
+dt_type_host(struct dt_state *s, int nargs)
+{
+ return (dt_type_hostname(s, 0) || dt_type_ipaddr(s, 0));
+}
+
+static bool
+dt_type_network(struct dt_state *s, int nargs)
+{
+ return (dt_type_uciname(s, 0) || dt_type_host(s, 0));
+}
+
+static bool
+dt_type_phonedigit(struct dt_state *s, int nargs)
+{
+ const char *p;
+
+ for (p = s->value;
+ *p && ((*p >= '0' && *p <= '9') || (*p == '*') || (*p == '#') ||
+ (*p == '!') || (*p == '.'));
+ p++);
+
+ return (*p == 0);
+}
+
+static bool
+dt_type_directory(struct dt_state *s, int nargs)
+{
+ struct stat st;
+ return (!stat(s->value, &st) && S_ISDIR(st.st_mode));
+}
+
+
+static bool
+dt_type_device(struct dt_state *s, int nargs)
+{
+ struct stat st;
+ return (!stat(s->value, &st) &&
+ (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)));
+}
+
+static bool
+dt_type_file(struct dt_state *s, int nargs)
+{
+ struct stat st;
+ return (!stat(s->value, &st) && S_ISREG(st.st_mode));
+}
+
+
+static struct dt_fun dt_types[] = {
+ { "or", dt_type_or },
+ { "and", dt_type_and },
+ { "not", dt_type_not },
+ { "neg", dt_type_neg },
+ { "list", dt_type_list },
+ { "min", dt_type_min },
+ { "max", dt_type_max },
+ { "range", dt_type_range },
+ { "minlength", dt_type_minlen },
+ { "maxlength", dt_type_maxlen },
+ { "rangelength", dt_type_rangelen },
+ { "integer", dt_type_int },
+ { "uinteger", dt_type_uint },
+ { "float", dt_type_float },
+ { "ufloat", dt_type_ufloat },
+ { "bool", dt_type_bool },
+ { "string", dt_type_string },
+ { "ip4addr", dt_type_ip4addr },
+ { "ip6addr", dt_type_ip6addr },
+ { "ipaddr", dt_type_ipaddr },
+ { "cidr4", dt_type_cidr4 },
+ { "cidr6", dt_type_cidr6 },
+ { "cidr", dt_type_cidr },
+ { "netmask4", dt_type_netmask4 },
+ { "netmask6", dt_type_netmask6 },
+ { "ipmask4", dt_type_ipmask4 },
+ { "ipmask6", dt_type_ipmask6 },
+ { "ipmask", dt_type_ipmask },
+ { "port", dt_type_port },
+ { "portrange", dt_type_portrange },
+ { "macaddr", dt_type_macaddr },
+ { "uciname", dt_type_uciname },
+ { "wpakey", dt_type_wpakey },
+ { "wepkey", dt_type_wepkey },
+ { "hostname", dt_type_hostname },
+ { "host", dt_type_host },
+ { "network", dt_type_network },
+ { "phonedigit", dt_type_phonedigit },
+ { "directory", dt_type_directory },
+ { "device", dt_type_device },
+ { "file", dt_type_file },
+
+ { }
+};
+
+static struct dt_fun *
+dt_lookup_function(const char *s, const char *e)
+{
+ struct dt_fun *fun = dt_types;
+
+ while (fun->name)
+ {
+ if (!strncmp(fun->name, s, e - s) && *(fun->name + (e - s)) == '\0')
+ return fun;
+
+ fun++;
+ }
+
+ return NULL;
+}
+
+static bool
+dt_parse_atom(struct dt_state *s, const char *label, const char *end)
+{
+ char q, *e;
+ const char *p;
+ bool esc;
+ double dval;
+ struct dt_fun *func;
+ struct dt_op *op = &s->stack[s->depth];
+
+ if ((s->depth + 1) >= (sizeof(s->stack) / sizeof(s->stack[0])))
+ {
+ printf("Syntax error, expression too long\n");
+ return false;
+ }
+
+ while (isspace(*label))
+ label++;
+
+ /* test whether label is a float */
+ dval = strtod(label, &e);
+
+ if (e > label)
+ {
+ op->next = e;
+ op->type = OP_NUMBER;
+ op->value.number = dval;
+ op->nextop = ++s->depth;
+
+ return true;
+ }
+ else if ((*label == '"') || (*label == '\''))
+ {
+ for (p = label + 1, q = *label, esc = false; p <= end; p++)
+ {
+ if (esc)
+ {
+ esc = false;
+ continue;
+ }
+ else if (*p == '\\')
+ {
+ esc = true;
+ continue;
+ }
+ else if (*p == q)
+ {
+ op->next = p + 1;
+ op->type = OP_STRING;
+ op->length = (p - label) - 2;
+ op->value.string = label + 1;
+ op->nextop = ++s->depth;
+
+ return true;
+ }
+ }
+
+ printf("Syntax error, unterminated string\n");
+ return false;
+ }
+ else if (*label)
+ {
+ for (p = label;
+ p <= end && ((*p >= 'A' && *p <= 'Z') ||
+ (*p >= 'a' && *p <= 'z') ||
+ (*p >= '0' && *p <= '9') ||
+ (*p == '_'));
+ p++);
+
+ func = dt_lookup_function(label, p);
+
+ if (!func)
+ {
+ printf("Syntax error, unrecognized function\n");
+ return false;
+ }
+
+ op->next = p;
+ op->type = OP_FUNCTION;
+ op->value.function = func;
+ op->nextop = ++s->depth;
+
+ return true;
+ }
+
+ printf("Syntax error, unexpected EOF\n");
+ return false;
+}
+
+static bool
+dt_parse_list(struct dt_state *s, const char *code, const char *end);
+
+static bool
+dt_parse_expr(const char *code, const char *end, struct dt_state *s)
+{
+ struct dt_op *tok;
+
+ if (!dt_parse_atom(s, code, end))
+ return false;
+
+ tok = &s->stack[s->depth - 1];
+
+ while (isspace(*tok->next))
+ tok->next++;
+
+ if (tok->type == OP_FUNCTION)
+ {
+ if (*tok->next == '(')
+ {
+ end--;
+
+ while (isspace(*end) && end > tok->next + 1)
+ end--;
+
+ return dt_parse_list(s, tok->next + 1, end);
+ }
+ else if (tok->next == end)
+ {
+ return dt_parse_list(s, tok->next, tok->next);
+ }
+
+ printf("Syntax error, expected '(' or EOF after function label\n");
+ return false;
+ }
+ else if (tok->next == end)
+ {
+ return true;
+ }
+
+ printf("Syntax error, expected ',' after literal\n");
+ return false;
+}
+
+static bool
+dt_parse_list(struct dt_state *s, const char *code, const char *end)
+{
+ char c;
+ bool esc;
+ int nest;
+ const char *p, *last;
+ struct dt_op *fptr;
+
+ if (!code)
+ return false;
+
+ fptr = &s->stack[s->depth - 1];
+
+ for (nest = 0, p = last = code, esc = false, c = *p;
+ p <= end;
+ p++, c = (p < end) ? *p : '\0')
+ {
+ if (esc)
+ {
+ esc = false;
+ continue;
+ }
+
+ switch (c)
+ {
+ case '\\':
+ esc = true;
+ break;
+
+ case '(':
+ nest++;
+ break;
+
+ case ')':
+ nest--;
+ break;
+
+ case ',':
+ case '\0':
+ if (nest <= 0)
+ {
+ if (p > last)
+ {
+ if (!dt_parse_expr(last, p, s))
+ return false;
+
+ fptr->length++;
+ }
+
+ last = p + 1;
+ }
+
+ break;
+ }
+ }
+
+ fptr->nextop = s->depth;
+ return true;
+}
+
+static bool
+dt_step(struct dt_state *s)
+{
+ bool rv;
+ struct dt_op *op = &s->stack[s->pos];
+
+ switch (op->type)
+ {
+ case OP_BOOL:
+ rv = op->value.boolean;
+ break;
+
+ case OP_NUMBER:
+ rv = dt_test_number(op->value.number, s->value);
+ break;
+
+ case OP_STRING:
+ rv = dt_test_string(op->value.string, op->value.string + op->length, s->value);
+ break;
+
+ case OP_FUNCTION:
+ rv = dt_call(s);
+ break;
+
+ default:
+ rv = false;
+ break;
+ }
+
+ s->pos = op->nextop;
+ return rv;
+}
+
+static bool
+dt_call(struct dt_state *s)
+{
+ bool rv;
+ struct dt_op *fptr = &s->stack[s->pos];
+ struct dt_fun *func = fptr->value.function;
+
+ s->pos++;
+
+ rv = func->call(s, fptr->length);
+
+ s->pos = fptr->nextop;
+
+ return rv;
+}
+
+bool
+dt_parse(const char *code, const char *value)
+{
+ struct dt_state s = {
+ .depth = 1,
+ .stack = {
+ {
+ .type = OP_FUNCTION,
+ .value.function = &dt_types[0],
+ .next = code
+ }
+ }
+ };
+
+ if (!value || !*value)
+ return false;
+
+ if (!dt_parse_list(&s, code, code + strlen(code)))
+ return false;
+
+ s.value = value;
+
+ return dt_call(&s);
+}
projects / oweals / ubox.git / commitdiff