--- /dev/null
+/**
+ * @file
+ * @brief Connection rule parser and checker
+ * @version $Id$
+ *
+ * by Tony Vencill (Tonto on IRC) <vencill@bga.com>
+ *
+ * The majority of this file is a recursive descent parser used to convert
+ * connection rules into expression trees when the conf file is read.
+ * All parsing structures and types are hidden in the interest of good
+ * programming style and to make possible future data structure changes
+ * without affecting the interface between this patch and the rest of the
+ * server. The only functions accessible externally are crule_parse,
+ * crule_free, and crule_eval. Prototypes for these functions can be
+ * found in h.h.
+ *
+ * Please direct any connection rule or SmartRoute questions to Tonto on
+ * IRC or by email to vencill@bga.com.
+ *
+ * For parser testing, defining CR_DEBUG generates a stand-alone parser
+ * that takes rules from stdin and prints out memory allocation
+ * information and the parsed rule. This stand alone parser is ignorant
+ * of the irc server and thus cannot do rule evaluation. Do not define
+ * this flag when compiling the server! If you wish to generate the
+ * test parser, compile from the ircd directory with a line similar to
+ * cc -o parser -DCR_DEBUG crule.c
+ *
+ * The define CR_CHKCONF is provided to generate routines needed in
+ * chkconf. These consist of the parser, a different crule_parse that
+ * prints errors to stderr, and crule_free (just for good style and to
+ * more closely simulate the actual ircd environment). crule_eval and
+ * the rule functions are made empty functions as in the stand-alone
+ * test parser.
+ *
+ * The production rules for the grammar are as follows ("rule" is the
+ * starting production):
+ *
+ * rule:
+ * orexpr END END is end of input or :
+ * orexpr:
+ * andexpr
+ * andexpr || orexpr
+ * andexpr:
+ * primary
+ * primary && andexpr
+ * primary:
+ * function
+ * ! primary
+ * ( orexpr )
+ * function:
+ * word ( ) word is alphanumeric string, first character
+ * word ( arglist ) must be a letter
+ * arglist:
+ * word
+ * word , arglist
+ */
+#include "config.h"
+
+#include "crule.h"
+#ifndef CR_DEBUG
+
+/* ircd functions and types we need */
+#include "client.h"
+#include "ircd.h"
+#include "ircd_alloc.h"
+#include "ircd_chattr.h"
+#include "ircd_string.h"
+#include "match.h"
+#include "s_bsd.h"
+#include "s_debug.h"
+#include "struct.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#else /* includes and defines to make the stand-alone test parser */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BadPtr(x) (!(x) || (*(x) == '\0'))
+#define DupString(x,y) \
+ do { \
+ x = (char*) MyMalloc(strlen(y)+1); \
+ strcpy(x,y); \
+ } while(0)
+
+/* We don't care about collation discrepancies here, it seems.... */
+#define ircd_strcmp strcasecmp
+
+#endif
+
+#include <string.h>
+
+
+#if defined(CR_DEBUG) || defined(CR_CHKCONF)
+#undef MyMalloc
+#undef malloc
+#define MyMalloc malloc
+#undef MyFree
+#undef free
+#define MyFree free
+#endif
+
+/* some constants and shared data types */
+#define CR_MAXARGLEN 80 /**< Maximum arg length (must be > HOSTLEN) */
+#define CR_MAXARGS 3 /**< Maximum number of args for a rule */
+
+/*
+ * Some symbols for easy reading
+ */
+
+/** Input scanner tokens. */
+enum crule_token {
+ CR_UNKNOWN, /**< Unknown token type. */
+ CR_END, /**< End of input ('\\0' or ':'). */
+ CR_AND, /**< Logical and operator (&&). */
+ CR_OR, /**< Logical or operator (||). */
+ CR_NOT, /**< Logical not operator (!). */
+ CR_OPENPAREN, /**< Open parenthesis. */
+ CR_CLOSEPAREN, /**< Close parenthesis. */
+ CR_COMMA, /**< Comma. */
+ CR_WORD /**< Something that looks like a hostmask (alphanumerics, "*?.-"). */
+};
+
+/** Parser error codes. */
+enum crule_errcode {
+ CR_NOERR, /**< No error. */
+ CR_UNEXPCTTOK, /**< Invalid token given context. */
+ CR_UNKNWTOK, /**< Input did not form a valid token. */
+ CR_EXPCTAND, /**< Did not see expected && operator. */
+ CR_EXPCTOR, /**< Did not see expected || operator. */
+ CR_EXPCTPRIM, /**< Expected a primitive (parentheses, ! or word). */
+ CR_EXPCTOPEN, /**< Expected an open parenthesis after function name. */
+ CR_EXPCTCLOSE, /**< Expected a close parenthesis to match open parenthesis. */
+ CR_UNKNWFUNC, /**< Attempt to use an unknown function. */
+ CR_ARGMISMAT /**< Wrong number of arguments to function. */
+};
+
+/*
+ * Expression tree structure, function pointer, and tree pointer local!
+ */
+/** Evaluation function for a connection rule. */
+typedef int (*crule_funcptr) (int, void **);
+
+/** Node in a connection rule tree. */
+struct CRuleNode {
+ crule_funcptr funcptr; /**< Evaluation function for this node. */
+ int numargs; /**< Number of arguments. */
+ void *arg[CR_MAXARGS]; /**< Array of arguments. For operators, each arg
+ is a tree element; for functions, each arg is
+ a string. */
+};
+
+/** Typedef to save typing effort. */
+typedef struct CRuleNode* CRuleNodePtr;
+
+/* local rule function prototypes */
+static int crule_connected(int, void *[]);
+static int crule_directcon(int, void *[]);
+static int crule_via(int, void *[]);
+static int crule_directop(int, void *[]);
+static int crule__andor(int, void *[]);
+static int crule__not(int, void *[]);
+
+/* local parsing function prototypes */
+static int crule_gettoken(int* token, const char** str);
+static void crule_getword(char*, int*, size_t, const char**);
+static int crule_parseandexpr(CRuleNodePtr*, int *, const char**);
+static int crule_parseorexpr(CRuleNodePtr*, int *, const char**);
+static int crule_parseprimary(CRuleNodePtr*, int *, const char**);
+static int crule_parsefunction(CRuleNodePtr*, int *, const char**);
+static int crule_parsearglist(CRuleNodePtr, int *, const char**);
+
+#if defined(CR_DEBUG) || defined(CR_CHKCONF)
+/*
+ * Prototypes for the test parser; if not debugging,
+ * these are defined in h.h
+ */
+struct CRuleNode* crule_parse(const char*);
+void crule_free(struct CRuleNode**);
+#ifdef CR_DEBUG
+void print_tree(CRuleNodePtr);
+#endif
+#endif
+
+/** Error messages, indexed by the corresponding crule_errcode. */
+char *crule_errstr[] = {
+ "Unknown error", /* NOERR? - for completeness */
+ "Unexpected token", /* UNEXPCTTOK */
+ "Unknown token", /* UNKNWTOK */
+ "And expr expected", /* EXPCTAND */
+ "Or expr expected", /* EXPCTOR */
+ "Primary expected", /* EXPCTPRIM */
+ "( expected", /* EXPCTOPEN */
+ ") expected", /* EXPCTCLOSE */
+ "Unknown function", /* UNKNWFUNC */
+ "Argument mismatch" /* ARGMISMAT */
+};
+
+/** Connection rule function table entry. */
+struct crule_funclistent {
+ char name[15]; /**< Function name. */
+ int reqnumargs; /**< Required number of arguments. */
+ crule_funcptr funcptr; /**< Handler function. */
+};
+
+/** Defined connection rules. */
+struct crule_funclistent crule_funclist[] = {
+ /* maximum function name length is 14 chars */
+ {"connected", 1, crule_connected},
+ {"directcon", 1, crule_directcon},
+ {"via", 2, crule_via},
+ {"directop", 0, crule_directop},
+ {"", 0, NULL} /* this must be here to mark end of list */
+};
+
+/** Check whether any connected server matches crulearg[0].
+ * @param[in] numargs Number of valid args in \a crulearg.
+ * @param[in] crulearg Argument array.
+ * @return Non-zero if the condition is true, zero if not.
+ */
+static int crule_connected(int numargs, void *crulearg[])
+{
+#if !defined(CR_DEBUG) && !defined(CR_CHKCONF)
+ struct Client *acptr;
+
+ /* taken from m_links */
+ for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr))
+ {
+ if (!IsServer(acptr) || IsMe(acptr))
+ continue;
+ if (match((char *)crulearg[0], cli_name(acptr)))
+ continue;
+ return (1);
+ }
+#endif
+ return (0);
+}
+
+/** Check whether any directly connected server matches crulearg[0].
+ * @param[in] numargs Number of valid args in \a crulearg.
+ * @param[in] crulearg Argument array.
+ * @return Non-zero if the condition is true, zero if not.
+ */
+static int crule_directcon(int numargs, void *crulearg[])
+{
+#if !defined(CR_DEBUG) && !defined(CR_CHKCONF)
+ int i;
+ struct Client *acptr;
+
+ /* adapted from m_trace and exit_one_client */
+ for (i = 0; i <= HighestFd; i++)
+ {
+ if (!(acptr = LocalClientArray[i]) || !IsServer(acptr))
+ continue;
+ if (match((char *)crulearg[0], cli_name(acptr)))
+ continue;
+ return (1);
+ }
+#endif
+ return (0);
+}
+
+/** Check whether a connected server matching crulearg[1] is
+ * connnected to me behind one matching crulearg[0].
+ * @param[in] numargs Number of valid args in \a crulearg.
+ * @param[in] crulearg Argument array.
+ * @return Non-zero if the condition is true, zero if not.
+ */
+static int crule_via(int numargs, void *crulearg[])
+{
+#if !defined(CR_DEBUG) && !defined(CR_CHKCONF)
+ struct Client *acptr;
+
+ /* adapted from m_links */
+ for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr))
+ {
+ if (!IsServer(acptr) || IsMe(acptr))
+ continue;
+ if (match((char *)crulearg[1], cli_name(acptr)))
+ continue;
+ if (match((char *)crulearg[0], cli_name(cli_from(acptr))))
+ continue;
+ return (1);
+ }
+#endif
+ return (0);
+}
+
+/** Check whether we have a local IRC operator.
+ * @param[in] numargs Number of valid args in \a crulearg.
+ * @param[in] crulearg Argument array.
+ * @return Non-zero if the condition is true, zero if not.
+ */
+static int crule_directop(int numargs, void *crulearg[])
+{
+#if !defined(CR_DEBUG) && !defined(CR_CHKCONF)
+ int i;
+ struct Client *acptr;
+
+ /* adapted from m_trace */
+ for (i = 0; i <= HighestFd; i++)
+ {
+ if (!(acptr = LocalClientArray[i]) || !IsAnOper(acptr))
+ continue;
+ return (1);
+ }
+#endif
+ return (0);
+}
+
+/** Evaluate a connection rule.
+ * @param[in] rule Rule to evalute.
+ * @return Non-zero if the rule allows the connection, zero otherwise.
+ */
+int crule_eval(struct CRuleNode* rule)
+{
+ return (rule->funcptr(rule->numargs, rule->arg));
+}
+
+/** Perform an and-or-or test on crulearg[0] and crulearg[1].
+ * If crulearg[2] is non-NULL, it means do OR; if it is NULL, do AND.
+ * @param[in] numargs Number of valid args in \a crulearg.
+ * @param[in] crulearg Argument array.
+ * @return Non-zero if the condition is true, zero if not.
+ */
+static int crule__andor(int numargs, void *crulearg[])
+{
+ int result1;
+
+ result1 = crule_eval(crulearg[0]);
+ if (crulearg[2]) /* or */
+ return (result1 || crule_eval(crulearg[1]));
+ else
+ return (result1 && crule_eval(crulearg[1]));
+}
+
+/** Logically invert the result of crulearg[0].
+ * @param[in] numargs Number of valid args in \a crulearg.
+ * @param[in] crulearg Argument array.
+ * @return Non-zero if the condition is true, zero if not.
+ */
+static int crule__not(int numargs, void *crulearg[])
+{
+ return (!crule_eval(crulearg[0]));
+}
+
+/** Scan an input token from \a ruleptr.
+ * @param[out] next_tokp Receives type of next token.
+ * @param[in,out] ruleptr Next readable character from input.
+ * @return Either CR_UNKNWTOK if the input was unrecognizable, else CR_NOERR.
+ */
+static int crule_gettoken(int* next_tokp, const char** ruleptr)
+{
+ char pending = '\0';
+
+ *next_tokp = CR_UNKNOWN;
+ while (*next_tokp == CR_UNKNOWN)
+ switch (*(*ruleptr)++)
+ {
+ case ' ':
+ case '\t':
+ break;
+ case '&':
+ if (pending == '\0')
+ pending = '&';
+ else if (pending == '&')
+ *next_tokp = CR_AND;
+ else
+ return (CR_UNKNWTOK);
+ break;
+ case '|':
+ if (pending == '\0')
+ pending = '|';
+ else if (pending == '|')
+ *next_tokp = CR_OR;
+ else
+ return (CR_UNKNWTOK);
+ break;
+ case '!':
+ *next_tokp = CR_NOT;
+ break;
+ case '(':
+ *next_tokp = CR_OPENPAREN;
+ break;
+ case ')':
+ *next_tokp = CR_CLOSEPAREN;
+ break;
+ case ',':
+ *next_tokp = CR_COMMA;
+ break;
+ case '\0':
+ (*ruleptr)--;
+ *next_tokp = CR_END;
+ break;
+ case ':':
+ *next_tokp = CR_END;
+ break;
+ default:
+ if ((IsAlpha(*(--(*ruleptr)))) || (**ruleptr == '*') ||
+ (**ruleptr == '?') || (**ruleptr == '.') || (**ruleptr == '-'))
+ *next_tokp = CR_WORD;
+ else
+ return (CR_UNKNWTOK);
+ break;
+ }
+ return CR_NOERR;
+}
+
+/** Scan a word from \a ruleptr.
+ * @param[out] word Output buffer.
+ * @param[out] wordlenp Length of word written to \a word (not including terminating NUL).
+ * @param[in] maxlen Maximum number of bytes writable to \a word.
+ * @param[in,out] ruleptr Next readable character from input.
+ */
+static void crule_getword(char* word, int* wordlenp, size_t maxlen, const char** ruleptr)
+{
+ char *word_ptr;
+
+ word_ptr = word;
+ while ((size_t)(word_ptr - word) < maxlen
+ && (IsAlnum(**ruleptr)
+ || **ruleptr == '*' || **ruleptr == '?'
+ || **ruleptr == '.' || **ruleptr == '-'))
+ *word_ptr++ = *(*ruleptr)++;
+ *word_ptr = '\0';
+ *wordlenp = word_ptr - word;
+}
+
+/** Parse an entire rule.
+ * @param[in] rule Text form of rule.
+ * @return CRuleNode for rule, or NULL if there was a parse error.
+ */
+struct CRuleNode* crule_parse(const char *rule)
+{
+ const char* ruleptr = rule;
+ int next_tok;
+ struct CRuleNode* ruleroot = 0;
+ int errcode = CR_NOERR;
+
+ if ((errcode = crule_gettoken(&next_tok, &ruleptr)) == CR_NOERR) {
+ if ((errcode = crule_parseorexpr(&ruleroot, &next_tok, &ruleptr)) == CR_NOERR) {
+ if (ruleroot != NULL) {
+ if (next_tok == CR_END)
+ return (ruleroot);
+ else
+ errcode = CR_UNEXPCTTOK;
+ }
+ else
+ errcode = CR_EXPCTOR;
+ }
+ }
+ if (ruleroot != NULL)
+ crule_free(&ruleroot);
+#if !defined(CR_DEBUG) && !defined(CR_CHKCONF)
+ Debug((DEBUG_ERROR, "%s in rule: %s", crule_errstr[errcode], rule));
+#else
+ fprintf(stderr, "%s in rule: %s\n", crule_errstr[errcode], rule);
+#endif
+ return 0;
+}
+
+/** Parse an or expression.
+ * @param[out] orrootp Receives parsed node.
+ * @param[in,out] next_tokp Next input token type.
+ * @param[in,out] ruleptr Next input character.
+ * @return A crule_errcode value.
+ */
+static int crule_parseorexpr(CRuleNodePtr * orrootp, int *next_tokp, const char** ruleptr)
+{
+ int errcode = CR_NOERR;
+ CRuleNodePtr andexpr;
+ CRuleNodePtr orptr;
+
+ *orrootp = NULL;
+ while (errcode == CR_NOERR)
+ {
+ errcode = crule_parseandexpr(&andexpr, next_tokp, ruleptr);
+ if ((errcode == CR_NOERR) && (*next_tokp == CR_OR))
+ {
+ orptr = (CRuleNodePtr) MyMalloc(sizeof(struct CRuleNode));
+#ifdef CR_DEBUG
+ fprintf(stderr, "allocating or element at %ld\n", orptr);
+#endif
+ orptr->funcptr = crule__andor;
+ orptr->numargs = 3;
+ orptr->arg[2] = (void *)1;
+ if (*orrootp != NULL)
+ {
+ (*orrootp)->arg[1] = andexpr;
+ orptr->arg[0] = *orrootp;
+ }
+ else
+ orptr->arg[0] = andexpr;
+ *orrootp = orptr;
+ }
+ else
+ {
+ if (*orrootp != NULL)
+ {
+ if (andexpr != NULL)
+ {
+ (*orrootp)->arg[1] = andexpr;
+ return (errcode);
+ }
+ else
+ {
+ (*orrootp)->arg[1] = NULL; /* so free doesn't seg fault */
+ return (CR_EXPCTAND);
+ }
+ }
+ else
+ {
+ *orrootp = andexpr;
+ return (errcode);
+ }
+ }
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ return (errcode);
+ }
+ return (errcode);
+}
+
+/** Parse an and expression.
+ * @param[out] androotp Receives parsed node.
+ * @param[in,out] next_tokp Next input token type.
+ * @param[in,out] ruleptr Next input character.
+ * @return A crule_errcode value.
+ */
+static int crule_parseandexpr(CRuleNodePtr * androotp, int *next_tokp, const char** ruleptr)
+{
+ int errcode = CR_NOERR;
+ CRuleNodePtr primary;
+ CRuleNodePtr andptr;
+
+ *androotp = NULL;
+ while (errcode == CR_NOERR)
+ {
+ errcode = crule_parseprimary(&primary, next_tokp, ruleptr);
+ if ((errcode == CR_NOERR) && (*next_tokp == CR_AND))
+ {
+ andptr = (CRuleNodePtr) MyMalloc(sizeof(struct CRuleNode));
+#ifdef CR_DEBUG
+ fprintf(stderr, "allocating and element at %ld\n", andptr);
+#endif
+ andptr->funcptr = crule__andor;
+ andptr->numargs = 3;
+ andptr->arg[2] = (void *)0;
+ if (*androotp != NULL)
+ {
+ (*androotp)->arg[1] = primary;
+ andptr->arg[0] = *androotp;
+ }
+ else
+ andptr->arg[0] = primary;
+ *androotp = andptr;
+ }
+ else
+ {
+ if (*androotp != NULL)
+ {
+ if (primary != NULL)
+ {
+ (*androotp)->arg[1] = primary;
+ return (errcode);
+ }
+ else
+ {
+ (*androotp)->arg[1] = NULL; /* so free doesn't seg fault */
+ return (CR_EXPCTPRIM);
+ }
+ }
+ else
+ {
+ *androotp = primary;
+ return (errcode);
+ }
+ }
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ return (errcode);
+ }
+ return (errcode);
+}
+
+/** Parse a primary expression.
+ * @param[out] primrootp Receives parsed node.
+ * @param[in,out] next_tokp Next input token type.
+ * @param[in,out] ruleptr Next input character.
+ * @return A crule_errcode value.
+ */
+static int crule_parseprimary(CRuleNodePtr* primrootp, int *next_tokp, const char** ruleptr)
+{
+ CRuleNodePtr *insertionp;
+ int errcode = CR_NOERR;
+
+ *primrootp = NULL;
+ insertionp = primrootp;
+ while (errcode == CR_NOERR)
+ {
+ switch (*next_tokp)
+ {
+ case CR_OPENPAREN:
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ break;
+ if ((errcode = crule_parseorexpr(insertionp, next_tokp, ruleptr)) != CR_NOERR)
+ break;
+ if (*insertionp == NULL)
+ {
+ errcode = CR_EXPCTAND;
+ break;
+ }
+ if (*next_tokp != CR_CLOSEPAREN)
+ {
+ errcode = CR_EXPCTCLOSE;
+ break;
+ }
+ errcode = crule_gettoken(next_tokp, ruleptr);
+ break;
+ case CR_NOT:
+ *insertionp = (CRuleNodePtr) MyMalloc(sizeof(struct CRuleNode));
+#ifdef CR_DEBUG
+ fprintf(stderr, "allocating primary element at %ld\n", *insertionp);
+#endif
+ (*insertionp)->funcptr = crule__not;
+ (*insertionp)->numargs = 1;
+ (*insertionp)->arg[0] = NULL;
+ insertionp = (CRuleNodePtr *) & ((*insertionp)->arg[0]);
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ break;
+ continue;
+ case CR_WORD:
+ errcode = crule_parsefunction(insertionp, next_tokp, ruleptr);
+ break;
+ default:
+ if (*primrootp == NULL)
+ errcode = CR_NOERR;
+ else
+ errcode = CR_EXPCTPRIM;
+ break;
+ }
+ return (errcode);
+ }
+ return (errcode);
+}
+
+/** Parse a function call.
+ * @param[out] funcrootp Receives parsed node.
+ * @param[in,out] next_tokp Next input token type.
+ * @param[in,out] ruleptr Next input character.
+ * @return A crule_errcode value.
+ */
+static int crule_parsefunction(CRuleNodePtr* funcrootp, int* next_tokp, const char** ruleptr)
+{
+ int errcode = CR_NOERR;
+ char funcname[CR_MAXARGLEN];
+ int namelen;
+ int funcnum;
+
+ *funcrootp = NULL;
+ crule_getword(funcname, &namelen, CR_MAXARGLEN - 1, ruleptr);
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ return (errcode);
+ if (*next_tokp == CR_OPENPAREN)
+ {
+ for (funcnum = 0;; funcnum++)
+ {
+ if (0 == ircd_strcmp(crule_funclist[funcnum].name, funcname))
+ break;
+ if (crule_funclist[funcnum].name[0] == '\0')
+ return (CR_UNKNWFUNC);
+ }
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ return (errcode);
+ *funcrootp = (CRuleNodePtr) MyMalloc(sizeof(struct CRuleNode));
+#ifdef CR_DEBUG
+ fprintf(stderr, "allocating function element at %ld\n", *funcrootp);
+#endif
+ (*funcrootp)->funcptr = NULL; /* for freeing aborted trees */
+ if ((errcode =
+ crule_parsearglist(*funcrootp, next_tokp, ruleptr)) != CR_NOERR)
+ return (errcode);
+ if (*next_tokp != CR_CLOSEPAREN)
+ return (CR_EXPCTCLOSE);
+ if ((crule_funclist[funcnum].reqnumargs != (*funcrootp)->numargs) &&
+ (crule_funclist[funcnum].reqnumargs != -1))
+ return (CR_ARGMISMAT);
+ if ((errcode = crule_gettoken(next_tokp, ruleptr)) != CR_NOERR)
+ return (errcode);
+ (*funcrootp)->funcptr = crule_funclist[funcnum].funcptr;
+ return (CR_NOERR);
+ }
+ else
+ return (CR_EXPCTOPEN);
+}
+
+/** Parse the argument list to a CRuleNode.
+ * @param[in,out] argrootp Node whos argument list is being populated.
+ * @param[in,out] next_tokp Next input token type.
+ * @param[in,out] ruleptr Next input character.
+ * @return A crule_errcode value.
+ */
+static int crule_parsearglist(CRuleNodePtr argrootp, int *next_tokp, const char** ruleptr)
+{
+ int errcode = CR_NOERR;
+ char *argelemp = NULL;
+ char currarg[CR_MAXARGLEN];
+ int arglen = 0;
+ char word[CR_MAXARGLEN];
+ int wordlen = 0;
+
+ argrootp->numargs = 0;
+ currarg[0] = '\0';
+ while (errcode == CR_NOERR)
+ {
+ switch (*next_tokp)
+ {
+ case CR_WORD:
+ crule_getword(word, &wordlen, CR_MAXARGLEN - 1, ruleptr);
+ if (currarg[0] != '\0')
+ {
+ if ((arglen + wordlen) < (CR_MAXARGLEN - 1))
+ {
+ strcat(currarg, " ");
+ strcat(currarg, word);
+ arglen += wordlen + 1;
+ }
+ }
+ else
+ {
+ strcpy(currarg, word);
+ arglen = wordlen;
+ }
+ errcode = crule_gettoken(next_tokp, ruleptr);
+ break;
+ default:
+#if !defined(CR_DEBUG) && !defined(CR_CHKCONF)
+ collapse(currarg);
+#endif
+ if (currarg[0] != '\0')
+ {
+ DupString(argelemp, currarg);
+ argrootp->arg[argrootp->numargs++] = (void *)argelemp;
+ }
+ if (*next_tokp != CR_COMMA)
+ return (CR_NOERR);
+ currarg[0] = '\0';
+ errcode = crule_gettoken(next_tokp, ruleptr);
+ break;
+ }
+ }
+ return (errcode);
+}
+
+/*
+ * This function is recursive.. I wish I knew a nonrecursive way but
+ * I don't. Anyway, recursion is fun.. :)
+ * DO NOT CALL THIS FUNCTION WITH A POINTER TO A NULL POINTER
+ * (i.e.: If *elem is NULL, you're doing it wrong - seg fault)
+ */
+/** Free a connection rule and all its children.
+ * @param[in,out] elem Pointer to pointer to element to free. MUST NOT BE NULL.
+ */
+void crule_free(struct CRuleNode** elem)
+{
+ int arg, numargs;
+
+ if ((*(elem))->funcptr == crule__not)
+ {
+ /* type conversions and ()'s are fun! ;) here have an aspirin.. */
+ if ((*(elem))->arg[0] != NULL)
+ crule_free((struct CRuleNode**) &((*(elem))->arg[0]));
+ }
+ else if ((*(elem))->funcptr == crule__andor)
+ {
+ crule_free((struct CRuleNode**) &((*(elem))->arg[0]));
+ if ((*(elem))->arg[1] != NULL)
+ crule_free((struct CRuleNode**) &((*(elem))->arg[1]));
+ }
+ else
+ {
+ numargs = (*(elem))->numargs;
+ for (arg = 0; arg < numargs; arg++)
+ MyFree((*(elem))->arg[arg]);
+ }
+#ifdef CR_DEBUG
+ fprintf(stderr, "freeing element at %ld\n", *elem);
+#endif
+ MyFree(*elem);
+ *elem = 0;
+}
+
+#ifdef CR_DEBUG
+/** Display a connection rule as text.
+ * @param[in] printelem Connection rule to display.
+ */
+static void print_tree(CRuleNodePtr printelem)
+{
+ int funcnum, arg;
+
+ if (printelem->funcptr == crule__not)
+ {
+ printf("!( ");
+ print_tree((CRuleNodePtr) printelem->arg[0]);
+ printf(") ");
+ }
+ else if (printelem->funcptr == crule__andor)
+ {
+ printf("( ");
+ print_tree((CRuleNodePtr) printelem->arg[0]);
+ if (printelem->arg[2])
+ printf("|| ");
+ else
+ printf("&& ");
+ print_tree((CRuleNodePtr) printelem->arg[1]);
+ printf(") ");
+ }
+ else
+ {
+ for (funcnum = 0;; funcnum++)
+ {
+ if (printelem->funcptr == crule_funclist[funcnum].funcptr)
+ break;
+ if (crule_funclist[funcnum].funcptr == NULL)
+ MyCoreDump;
+ }
+ printf("%s(", crule_funclist[funcnum].name);
+ for (arg = 0; arg < printelem->numargs; arg++)
+ {
+ if (arg != 0)
+ printf(",");
+ printf("%s", (char *)printelem->arg[arg]);
+ }
+ printf(") ");
+ }
+}
+
+#endif
+
+#ifdef CR_DEBUG
+/** Read connection rules from stdin and display parsed forms as text.
+ * @return Zero.
+ */
+int main(void)
+{
+ char indata[256];
+ CRuleNode* rule;
+
+ printf("rule: ");
+ while (fgets(indata, 256, stdin) != NULL)
+ {
+ indata[strlen(indata) - 1] = '\0'; /* lose the newline */
+ if ((rule = crule_parse(indata)) != NULL)
+ {
+ printf("equivalent rule: ");
+ print_tree((CRuleNodePtr) rule);
+ printf("\n");
+ crule_free(&rule);
+ }
+ printf("\nrule: ");
+ }
+ printf("\n");
+
+ return 0;
+}
+
+#endif
projects / ircu2.10.12-pk.git / blobdiff