/* Copyright (C) 2007-2010 Open Information Security Foundation * * You can copy, redistribute or modify this Program under the terms of * the GNU General Public License version 2 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. * * You should have received a copy of the GNU General Public License * version 2 along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ /** * \file * * \author Anoop Saldanha * * First iteration of aho-corasick MPM from - * * Efficient String Matching: An Aid to Bibliographic Search * Alfred V. Aho and Margaret J. Corasick * * - Uses the delta table for calculating transitions, instead of having * separate goto and failure transitions. * - If we cross 2 ** 16 states, we use 4 bytes in the transition table * to hold each state, otherwise we use 2 bytes. * - This version of the MPM is heavy on memory, but it performs well. * If you can fit the ruleset with this mpm on your box without hitting * swap, this is the MPM to go for. * * \todo - Do a proper analyis of our existing MPMs and suggest a good one based * on the pattern distribution and the expected traffic(say http). * - Tried out loop unrolling without any perf increase. Need to dig deeper. * - Try out holding whether they are any output strings from a particular * state in one of the bytes of a state var. Will be useful in cuda esp. */ #include "suricata-common.h" #include "suricata.h" #include "detect.h" #include "util-mpm-ac.h" #include "conf.h" #include "util-debug.h" #include "util-unittest.h" void SCACInitCtx(MpmCtx *, int); void SCACInitThreadCtx(MpmCtx *, MpmThreadCtx *, uint32_t); void SCACDestroyCtx(MpmCtx *); void SCACDestroyThreadCtx(MpmCtx *, MpmThreadCtx *); int SCACAddPatternCI(MpmCtx *, uint8_t *, uint16_t, uint16_t, uint16_t, uint32_t, uint32_t, uint8_t); int SCACAddPatternCS(MpmCtx *, uint8_t *, uint16_t, uint16_t, uint16_t, uint32_t, uint32_t, uint8_t); int SCACPreparePatterns(MpmCtx *mpm_ctx); uint32_t SCACSearch(MpmCtx *mpm_ctx, MpmThreadCtx *mpm_thread_ctx, PatternMatcherQueue *pmq, uint8_t *buf, uint16_t buflen); void SCACPrintInfo(MpmCtx *mpm_ctx); void SCACPrintSearchStats(MpmThreadCtx *mpm_thread_ctx); void SCACRegisterTests(void); /* a placeholder to denote a failure transition in the goto table */ #define SC_AC_FAIL -1 /* size of the hash table used to speed up pattern insertions initially */ #define INIT_HASH_SIZE 65536 #define STATE_QUEUE_CONTAINER_SIZE 65536 /** * \brief Helper structure used by AC during state table creation */ typedef struct StateQueue_ { int32_t store[STATE_QUEUE_CONTAINER_SIZE]; int top; int bot; } StateQueue; /** * \brief Register the aho-corasick mpm. */ void MpmACRegister(void) { mpm_table[MPM_AC].name = "ac"; /* don't need this. isn't that awesome? no more chopping and blah blah */ mpm_table[MPM_AC].max_pattern_length = 0; mpm_table[MPM_AC].InitCtx = SCACInitCtx; mpm_table[MPM_AC].InitThreadCtx = SCACInitThreadCtx; mpm_table[MPM_AC].DestroyCtx = SCACDestroyCtx; mpm_table[MPM_AC].DestroyThreadCtx = SCACDestroyThreadCtx; mpm_table[MPM_AC].AddPattern = SCACAddPatternCS; mpm_table[MPM_AC].AddPatternNocase = SCACAddPatternCI; mpm_table[MPM_AC].Prepare = SCACPreparePatterns; mpm_table[MPM_AC].Search = SCACSearch; mpm_table[MPM_AC].Cleanup = NULL; mpm_table[MPM_AC].PrintCtx = SCACPrintInfo; mpm_table[MPM_AC].PrintThreadCtx = SCACPrintSearchStats; mpm_table[MPM_AC].RegisterUnittests = SCACRegisterTests; return; } /** * \internal * \brief Initialize the AC context with user specified conf parameters. We * aren't retrieving anything for AC conf now, but we will certainly * need it, when we customize AC. */ static void SCACGetConfig() { //ConfNode *ac_conf; //const char *hash_val = NULL; //ConfNode *pm = ConfGetNode("pattern-matcher"); return; } /** * \internal * \brief Compares 2 patterns. We use it for the hashing process during the * the initial pattern insertion time, to cull duplicate sigs. * * \param p Pointer to the first pattern(SCACPattern). * \param pat Pointer to the second pattern(raw pattern array). * \param patlen Pattern length. * \param flags Flags. We don't need this. * * \retval hash A 32 bit unsigned hash. */ static inline int SCACCmpPattern(SCACPattern *p, uint8_t *pat, uint16_t patlen, char flags) { if (p->len != patlen) return 0; if (p->flags != flags) return 0; if (memcmp(p->cs, pat, patlen) != 0) return 0; return 1; } /** * \internal * \brief Creates a hash of the pattern. We use it for the hashing process * during the initial pattern insertion time, to cull duplicate sigs. * * \param pat Pointer to the pattern. * \param patlen Pattern length. * * \retval hash A 32 bit unsigned hash. */ static inline uint32_t SCACInitHashRaw(uint8_t *pat, uint16_t patlen) { uint32_t hash = patlen * pat[0]; if (patlen > 1) hash += pat[1]; return (hash % INIT_HASH_SIZE); } /** * \internal * \brief Looks up a pattern. We use it for the hashing process during the * the initial pattern insertion time, to cull duplicate sigs. * * \param ctx Pointer to the AC ctx. * \param pat Pointer to the pattern. * \param patlen Pattern length. * \param flags Flags. We don't need this. * * \retval hash A 32 bit unsigned hash. */ static inline SCACPattern *SCACInitHashLookup(SCACCtx *ctx, uint8_t *pat, uint16_t patlen, char flags) { uint32_t hash = SCACInitHashRaw(pat, patlen); if (ctx->init_hash[hash] == NULL) { return NULL; } SCACPattern *t = ctx->init_hash[hash]; for ( ; t != NULL; t = t->next) { if (SCACCmpPattern(t, pat, patlen, flags) == 1) return t; } return NULL; } /** * \internal * \brief Allocs a new pattern instance. * * \param mpm_ctx Pointer to the mpm context. * * \retval p Pointer to the newly created pattern. */ static inline SCACPattern *SCACAllocPattern(MpmCtx *mpm_ctx) { SCACPattern *p = SCMalloc(sizeof(SCACPattern)); if (p == NULL) { exit(EXIT_FAILURE); } memset(p, 0, sizeof(SCACPattern)); mpm_ctx->memory_cnt++; mpm_ctx->memory_size += sizeof(SCACPattern); return p; } /** * \internal * \brief Used to free SCACPattern instances. * * \param mpm_ctx Pointer to the mpm context. * \param p Pointer to the SCACPattern instance to be freed. */ static inline void SCACFreePattern(MpmCtx *mpm_ctx, SCACPattern *p) { if (p != NULL && p->cs != NULL && p->cs != p->ci) { SCFree(p->cs); mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= p->len; } if (p != NULL && p->ci != NULL) { SCFree(p->ci); mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= p->len; } if (p != NULL) { SCFree(p); mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= sizeof(SCACPattern); } return; } /** * \internal * \brief Does a memcpy of the input string to lowercase. * * \param d Pointer to the target area for memcpy. * \param s Pointer to the src string for memcpy. * \param len len of the string sent in s. */ static inline void memcpy_tolower(uint8_t *d, uint8_t *s, uint16_t len) { uint16_t i; for (i = 0; i < len; i++) d[i] = u8_tolower(s[i]); return; } static inline uint32_t SCACInitHash(SCACPattern *p) { uint32_t hash = p->len * p->cs[0]; if (p->len > 1) hash += p->cs[1]; return (hash % INIT_HASH_SIZE); } static inline int SCACInitHashAdd(SCACCtx *ctx, SCACPattern *p) { uint32_t hash = SCACInitHash(p); if (ctx->init_hash[hash] == NULL) { ctx->init_hash[hash] = p; return 0; } SCACPattern *tt = NULL; SCACPattern *t = ctx->init_hash[hash]; /* get the list tail */ do { tt = t; t = t->next; } while (t != NULL); tt->next = p; return 0; } /** * \internal * \brief Add a pattern to the mpm-ac context. * * \param mpm_ctx Mpm context. * \param pat Pointer to the pattern. * \param patlen Length of the pattern. * \param pid Pattern id * \param sid Signature id (internal id). * \param flags Pattern's MPM_PATTERN_* flags. * * \retval 0 On success. * \retval -1 On failure. */ static int SCACAddPattern(MpmCtx *mpm_ctx, uint8_t *pat, uint16_t patlen, uint16_t offset, uint16_t depth, uint32_t pid, uint32_t sid, uint8_t flags) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; SCLogDebug("Adding pattern for ctx %p, patlen %"PRIu16" and pid %" PRIu32, ctx, patlen, pid); if (patlen == 0) { SCLogWarning(SC_ERR_INVALID_ARGUMENTS, "pattern length 0"); return 0; } /* check if we have already inserted this pattern */ SCACPattern *p = SCACInitHashLookup(ctx, pat, patlen, flags); if (p == NULL) { SCLogDebug("Allocing new pattern"); /* p will never be NULL */ p = SCACAllocPattern(mpm_ctx); p->len = patlen; p->flags = flags; p->id = pid; p->ci = SCMalloc(patlen); if (p->ci == NULL) goto error; mpm_ctx->memory_cnt++; mpm_ctx->memory_size += patlen; memcpy_tolower(p->ci, pat, patlen); /* setup the case sensitive part of the pattern */ if (p->flags & MPM_PATTERN_FLAG_NOCASE) { /* nocase means no difference between cs and ci */ p->cs = p->ci; } else { if (memcmp(p->ci, pat, p->len) == 0) { /* no diff between cs and ci: pat is lowercase */ p->cs = p->ci; } else { p->cs = SCMalloc(patlen); if (p->cs == NULL) goto error; mpm_ctx->memory_cnt++; mpm_ctx->memory_size += patlen; memcpy(p->cs, pat, patlen); } } /* put in the pattern hash */ SCACInitHashAdd(ctx, p); if (mpm_ctx->pattern_cnt == 65535) { SCLogError(SC_ERR_AHO_CORASICK, "Max search words reached. Can't " "insert anymore. Exiting"); exit(EXIT_FAILURE); } mpm_ctx->pattern_cnt++; if (mpm_ctx->maxlen < patlen) mpm_ctx->maxlen = patlen; if (mpm_ctx->minlen == 0) { mpm_ctx->minlen = patlen; } else { if (mpm_ctx->minlen > patlen) mpm_ctx->minlen = patlen; } } return 0; error: SCACFreePattern(mpm_ctx, p); return -1; } /** * \internal * \brief Initialize a new state in the goto and output tables. * * \param mpm_ctx Pointer to the mpm context. * * \retval The state id, of the newly created state. */ static inline int SCACInitNewState(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; int ascii_code = 0; int size = 0; /* reallocate space in the goto table to include a new state */ size = (ctx->state_count + 1) * ctx->single_state_size; ctx->goto_table = SCRealloc(ctx->goto_table, size); if (ctx->goto_table == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } /* set all transitions for the newly assigned state as FAIL transitions */ for (ascii_code = 0; ascii_code < 256; ascii_code++) { ctx->goto_table[ctx->state_count][ascii_code] = SC_AC_FAIL; } /* reallocate space in the output table for the new state */ size = (ctx->state_count + 1) * sizeof(SCACOutputTable); ctx->output_table = SCRealloc(ctx->output_table, size); if (ctx->output_table == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(ctx->output_table + ctx->state_count, 0, sizeof(SCACOutputTable)); /* \todo using it temporarily now during dev, since I have restricted * state var in SCACCtx->state_table to uint16_t. */ //if (ctx->state_count > 65536) { // printf("state count exceeded\n"); // exit(EXIT_FAILURE); //} return ctx->state_count++; } /** * \internal * \brief Adds a pid to the output table for a state. * * \param state The state to whose output table we should add the pid. * \param pid The pattern id to add. * \param mpm_ctx Pointer to the mpm context. */ static void SCACSetOutputState(int32_t state, uint32_t pid, MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; SCACOutputTable *output_state = &ctx->output_table[state]; output_state->no_of_entries++; output_state->pids = realloc(output_state->pids, output_state->no_of_entries * sizeof(uint32_t)); if (output_state->pids == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } output_state->pids[output_state->no_of_entries - 1] = pid; return; } /** * \brief Helper function used by SCACCreateGotoTable. Adds a pattern to the * goto table. * * \param pattern Pointer to the pattern. * \param pattern_len Pattern length. * \param pid The pattern id, that corresponds to this pattern. We * need it to updated the output table for this pattern. * \param mpm_ctx Pointer to the mpm context. */ static inline void SCACEnter(uint8_t *pattern, uint16_t pattern_len, uint32_t pid, MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; int32_t state = 0; int32_t newstate = 0; int i = 0; int p = 0; /* walk down the trie till we have a match for the pattern prefix */ state = 0; for (i = 0; i < pattern_len; i++) { if (ctx->goto_table[state][pattern[i]] != SC_AC_FAIL) { state = ctx->goto_table[state][pattern[i]]; } else { break; } } /* add the non-matching pattern suffix to the trie, from the last state * we left off */ for (p = i; p < pattern_len; p++) { newstate = SCACInitNewState(mpm_ctx); ctx->goto_table[state][pattern[p]] = newstate; state = newstate; } /* add this pattern id, to the output table of the last state, where the * pattern ends in the trie */ SCACSetOutputState(state, pid, mpm_ctx); return; } /** * \internal * \brief Create the goto table. * * \param mpm_ctx Pointer to the mpm context. */ static inline void SCACCreateGotoTable(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; uint32_t i = 0; /* add each pattern to create the goto table */ for (i = 0; i < mpm_ctx->pattern_cnt; i++) { SCACEnter(ctx->parray[i]->cs, ctx->parray[i]->len, ctx->parray[i]->id, mpm_ctx); } int ascii_code = 0; for (ascii_code = 0; ascii_code < 256; ascii_code++) { if (ctx->goto_table[0][ascii_code] == SC_AC_FAIL) { ctx->goto_table[0][ascii_code] = 0; } } return; } static inline int SCACStateQueueIsEmpty(StateQueue *q) { if (q->top == q->bot) return 1; else return 0; } static inline void SCACEnqueue(StateQueue *q, int32_t state) { int i = 0; /*if we already have this */ for (i = q->bot; i < q->top; i++) { if (q->store[i] == state) return; } q->store[q->top++] = state; if (q->top == STATE_QUEUE_CONTAINER_SIZE) q->top = 0; if (q->top == q->bot) { SCLogCritical(SC_ERR_AHO_CORASICK, "Just ran out of space in the queue. " "Fatal Error. Exiting. Please file a bug report on this"); exit(EXIT_FAILURE); } return; } static inline int32_t SCACDequeue(StateQueue *q) { if (q->bot == STATE_QUEUE_CONTAINER_SIZE) q->bot = 0; if (q->bot == q->top) { SCLogCritical(SC_ERR_AHO_CORASICK, "StateQueue behaving weirdly. " "Fatal Error. Exiting. Please file a bug report on this"); exit(EXIT_FAILURE); } return q->store[q->bot++]; } /* #define SCACStateQueueIsEmpty(q) (((q)->top == (q)->bot) ? 1 : 0) #define SCACEnqueue(q, state) do { \ int i = 0; \ \ for (i = (q)->bot; i < (q)->top; i++) { \ if ((q)->store[i] == state) \ return; \ } \ \ (q)->store[(q)->top++] = state; \ \ if ((q)->top == STATE_QUEUE_CONTAINER_SIZE) \ (q)->top = 0; \ \ if ((q)->top == (q)->bot) { \ SCLogCritical(SC_ERR_AHO_CORASICK, "Just ran out of space in the queue. " \ "Fatal Error. Exiting. Please file a bug report on this"); \ exit(EXIT_FAILURE); \ } \ } while (0) #define SCACDequeue(q) ( (((q)->bot == STATE_QUEUE_CONTAINER_SIZE)? ((q)->bot = 0): 0), \ (((q)->bot == (q)->top) ? \ (printf("StateQueue behaving " \ "weirdly. Fatal Error. Exiting. Please " \ "file a bug report on this"), \ exit(EXIT_FAILURE)) : 0), \ (q)->store[(q)->bot++]) \ */ /** * \internal * \brief Club the output data from 2 states and store it in the 1st state. * dst_state_data = {dst_state_data} UNION {src_state_data} * * \param dst_state First state(also the destination) for the union operation. * \param src_state Second state for the union operation. * \param mpm_ctx Pointer to the mpm context. */ static inline void SCACClubOutputStates(int32_t dst_state, int32_t src_state, MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; uint32_t i = 0; uint32_t j = 0; SCACOutputTable *output_dst_state = &ctx->output_table[dst_state]; SCACOutputTable *output_src_state = &ctx->output_table[src_state]; for (i = 0; i < output_src_state->no_of_entries; i++) { for (j = 0; j < output_dst_state->no_of_entries; j++) { if (output_src_state->pids[i] == output_dst_state->pids[j]) { break; } } if (j == output_dst_state->no_of_entries) { output_dst_state->no_of_entries++; output_dst_state->pids = realloc(output_dst_state->pids, (output_dst_state->no_of_entries * sizeof(uint32_t)) ); if (output_dst_state->pids == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } output_dst_state->pids[output_dst_state->no_of_entries - 1] = output_src_state->pids[i]; } } return; } /** * \internal * \brief Create the failure table. * * \param mpm_ctx Pointer to the mpm context. */ static inline void SCACCreateFailureTable(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; int ascii_code = 0; int32_t state = 0; int32_t r_state = 0; StateQueue q; memset(&q, 0, sizeof(StateQueue)); /* allot space for the failure table. A failure entry in the table for * every state(SCACCtx->state_count) */ ctx->failure_table = malloc(ctx->state_count * sizeof(int32_t)); if (ctx->failure_table == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(ctx->failure_table, 0, ctx->state_count * sizeof(int32_t)); /* add the failure transitions for the 0th state, and add every non-fail * transition from the 0th state to the queue for further processing * of failure states */ for (ascii_code = 0; ascii_code < 256; ascii_code++) { int32_t temp_state = ctx->goto_table[0][ascii_code]; if (temp_state != 0) { SCACEnqueue(&q, temp_state); ctx->failure_table[temp_state] = 0; } } while (!SCACStateQueueIsEmpty(&q)) { /* pick up every state from the queue and add failure transitions */ r_state = SCACDequeue(&q); for (ascii_code = 0; ascii_code < 256; ascii_code++) { int32_t temp_state = ctx->goto_table[r_state][ascii_code]; if (temp_state == SC_AC_FAIL) continue; SCACEnqueue(&q, temp_state); state = ctx->failure_table[r_state]; while(ctx->goto_table[state][ascii_code] == SC_AC_FAIL) state = ctx->failure_table[state]; ctx->failure_table[temp_state] = ctx->goto_table[state][ascii_code]; SCACClubOutputStates(temp_state, ctx->failure_table[temp_state], mpm_ctx); } } return; } /** * \internal * \brief Create the delta table. * * \param mpm_ctx Pointer to the mpm context. */ static inline void SCACCreateDeltaTable(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; int ascii_code = 0; int32_t r_state = 0; if (ctx->state_count < 65536) { /* create space for the state table. We could have used the existing goto * table, but since we have it set to hold 32 bit state values, we will create * a new state table here of type SC_AC_STATE_TYPE(current set to uint16_t) */ ctx->state_table_u16 = malloc(ctx->state_count * sizeof(SC_AC_STATE_TYPE_U16) * 256); if (ctx->state_table_u16 == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(ctx->state_table_u16, 0, ctx->state_count * sizeof(SC_AC_STATE_TYPE_U16) * 256); mpm_ctx->memory_cnt++; mpm_ctx->memory_size += (ctx->state_count * sizeof(SC_AC_STATE_TYPE_U16) * 256); StateQueue q; memset(&q, 0, sizeof(StateQueue)); for (ascii_code = 0; ascii_code < 256; ascii_code++) { SC_AC_STATE_TYPE_U16 temp_state = ctx->goto_table[0][ascii_code]; ctx->state_table_u16[0][ascii_code] = temp_state; if (temp_state != 0) SCACEnqueue(&q, temp_state); } while (!SCACStateQueueIsEmpty(&q)) { r_state = SCACDequeue(&q); for (ascii_code = 0; ascii_code < 256; ascii_code++) { int32_t temp_state = ctx->goto_table[r_state][ascii_code]; if (temp_state != SC_AC_FAIL) { SCACEnqueue(&q, temp_state); ctx->state_table_u16[r_state][ascii_code] = temp_state; } else { ctx->state_table_u16[r_state][ascii_code] = ctx->state_table_u16[ctx->failure_table[r_state]][ascii_code]; } } } } else { /* create space for the state table. We could have used the existing goto * table, but since we have it set to hold 32 bit state values, we will create * a new state table here of type SC_AC_STATE_TYPE(current set to uint16_t) */ ctx->state_table_u32 = malloc(ctx->state_count * sizeof(SC_AC_STATE_TYPE_U32) * 256); if (ctx->state_table_u32 == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(ctx->state_table_u32, 0, ctx->state_count * sizeof(SC_AC_STATE_TYPE_U32) * 256); mpm_ctx->memory_cnt++; mpm_ctx->memory_size += (ctx->state_count * sizeof(SC_AC_STATE_TYPE_U32) * 256); StateQueue q; memset(&q, 0, sizeof(StateQueue)); for (ascii_code = 0; ascii_code < 256; ascii_code++) { SC_AC_STATE_TYPE_U32 temp_state = ctx->goto_table[0][ascii_code]; ctx->state_table_u32[0][ascii_code] = temp_state; if (temp_state != 0) SCACEnqueue(&q, temp_state); } while (!SCACStateQueueIsEmpty(&q)) { r_state = SCACDequeue(&q); for (ascii_code = 0; ascii_code < 256; ascii_code++) { int32_t temp_state = ctx->goto_table[r_state][ascii_code]; if (temp_state != SC_AC_FAIL) { SCACEnqueue(&q, temp_state); ctx->state_table_u32[r_state][ascii_code] = temp_state; } else { ctx->state_table_u32[r_state][ascii_code] = ctx->state_table_u32[ctx->failure_table[r_state]][ascii_code]; } } } } /* else - if (state->count < 65536) */ return; } #if 0 static void SCACPrintDeltaTable(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; int i = 0, j = 0; printf("##############Delta Table##############\n"); for (i = 0; i < ctx->state_count; i++) { printf("%d: \n", i); for (j = 0; j < 256; j++) { if (SCACGetDelta(i, j, mpm_ctx) != 0) { printf(" %c -> %d\n", j, SCACGetDelta(i, j, mpm_ctx)); } } } return; } #endif /** * \brief Process the patterns and prepare the state table. * * \param mpm_ctx Pointer to the mpm context. */ static inline void SCACPrepareStateTable(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; /* create the 0th state in the goto table and output_table */ SCACInitNewState(mpm_ctx); /* create the goto table */ SCACCreateGotoTable(mpm_ctx); /* create the failure table */ SCACCreateFailureTable(mpm_ctx); /* create the final state(delta) table */ SCACCreateDeltaTable(mpm_ctx); #if 0 SCACPrintDeltaTable(mpm_ctx); #endif /* we don't need these anymore */ free(ctx->goto_table); ctx->goto_table = NULL; free(ctx->failure_table); ctx->failure_table = NULL; return; } /** * \brief Process the patterns added to the mpm, and create the internal tables. * * \param mpm_ctx Pointer to the mpm context. */ int SCACPreparePatterns(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; if (mpm_ctx->pattern_cnt == 0) { SCLogInfo("No patterns supplied to this mpm_ctx"); return 0; } /* alloc the pattern array */ ctx->parray = (SCACPattern **)SCMalloc(mpm_ctx->pattern_cnt * sizeof(SCACPattern *)); if (ctx->parray == NULL) goto error; memset(ctx->parray, 0, mpm_ctx->pattern_cnt * sizeof(SCACPattern *)); mpm_ctx->memory_cnt++; mpm_ctx->memory_size += (mpm_ctx->pattern_cnt * sizeof(SCACPattern *)); /* populate it with the patterns in the hash */ uint32_t i = 0, p = 0; for (i = 0; i < INIT_HASH_SIZE; i++) { SCACPattern *node = ctx->init_hash[i], *nnode = NULL; while(node != NULL) { nnode = node->next; node->next = NULL; ctx->parray[p++] = node; node = nnode; } } /* we no longer need the hash, so free it's memory */ SCFree(ctx->init_hash); ctx->init_hash = NULL; /* the memory consumed by a single state in our goto table */ ctx->single_state_size = sizeof(int32_t) * 256; /* prepare the state table required by AC */ SCACPrepareStateTable(mpm_ctx); /* free all the stored patterns. Should save us a good 100-200 mbs */ for (i = 0; i < mpm_ctx->pattern_cnt; i++) { if (ctx->parray[i] != NULL) { SCACFreePattern(mpm_ctx, ctx->parray[i]); } } SCFree(ctx->parray); ctx->parray = NULL; mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= (mpm_ctx->pattern_cnt * sizeof(SCACPattern *)); return 0; error: return -1; } /** * \brief Init the mpm thread context. * * \param mpm_ctx Pointer to the mpm context. * \param mpm_thread_ctx Pointer to the mpm thread context. * \param matchsize We don't need this. */ void SCACInitThreadCtx(MpmCtx *mpm_ctx, MpmThreadCtx *mpm_thread_ctx, uint32_t matchsize) { memset(mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); mpm_thread_ctx->ctx = SCMalloc(sizeof(SCACThreadCtx)); if (mpm_thread_ctx->ctx == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(mpm_thread_ctx->ctx, 0, sizeof(SCACThreadCtx)); mpm_thread_ctx->memory_cnt++; mpm_thread_ctx->memory_size += sizeof(SCACThreadCtx); return; } /** * \brief Initialize the AC context. * * \param mpm_ctx Mpm context. * \param module_handle Cuda module handle from the cuda handler API. We don't * have to worry about this here. */ void SCACInitCtx(MpmCtx *mpm_ctx, int module_handle) { mpm_ctx->ctx = SCMalloc(sizeof(SCACCtx)); if (mpm_ctx->ctx == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(mpm_ctx->ctx, 0, sizeof(SCACCtx)); mpm_ctx->memory_cnt++; mpm_ctx->memory_size += sizeof(SCACCtx); /* initialize the hash we use to speed up pattern insertions */ SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; ctx->init_hash = SCMalloc(sizeof(SCACPattern *) * INIT_HASH_SIZE); if (ctx->init_hash == NULL) { SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory"); exit(EXIT_FAILURE); } memset(ctx->init_hash, 0, sizeof(SCACPattern *) * INIT_HASH_SIZE); /* get conf values for AC from our yaml file. We have no conf values for * now. We will certainly need this, as we develop the algo */ SCACGetConfig(); SCReturn; } /** * \brief Destroy the mpm thread context. * * \param mpm_ctx Pointer to the mpm context. * \param mpm_thread_ctx Pointer to the mpm thread context. */ void SCACDestroyThreadCtx(MpmCtx *mpm_ctx, MpmThreadCtx *mpm_thread_ctx) { SCACPrintSearchStats(mpm_thread_ctx); if (mpm_thread_ctx->ctx != NULL) { SCFree(mpm_thread_ctx->ctx); mpm_thread_ctx->ctx = NULL; mpm_thread_ctx->memory_cnt--; mpm_thread_ctx->memory_size -= sizeof(SCACThreadCtx); } return; } /** * \brief Destroy the mpm context. * * \param mpm_ctx Pointer to the mpm context. */ void SCACDestroyCtx(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; if (ctx == NULL) return; if (ctx->init_hash != NULL) { SCFree(ctx->init_hash); ctx->init_hash = NULL; mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= (INIT_HASH_SIZE * sizeof(SCACPattern *)); } if (ctx->parray != NULL) { uint32_t i; for (i = 0; i < mpm_ctx->pattern_cnt; i++) { if (ctx->parray[i] != NULL) { SCACFreePattern(mpm_ctx, ctx->parray[i]); } } SCFree(ctx->parray); ctx->parray = NULL; mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= (mpm_ctx->pattern_cnt * sizeof(SCACPattern *)); } if (ctx->state_count < 65536) { if (ctx->state_table_u16 != NULL) { SCFree(ctx->state_table_u16); ctx->state_table_u16 = NULL; mpm_ctx->memory_cnt++; mpm_ctx->memory_size -= (ctx->state_count * sizeof(SC_AC_STATE_TYPE_U16) * 256); } else if (ctx->state_table_u32 != NULL) { SCFree(ctx->state_table_u32); ctx->state_table_u32 = NULL; mpm_ctx->memory_cnt++; mpm_ctx->memory_size -= (ctx->state_count * sizeof(SC_AC_STATE_TYPE_U32) * 256); } } SCFree(mpm_ctx->ctx); mpm_ctx->memory_cnt--; mpm_ctx->memory_size -= sizeof(SCACCtx); return; } /** * \brief The aho corasick search function. * * \param mpm_ctx Pointer to the mpm context. * \param mpm_thread_ctx Pointer to the mpm thread context. * \param pmq Pointer to the Pattern Matcher Queue to hold * search matches. * \param buf Buffer to be searched. * \param buflen Buffer length. * * \retval matches Match count. */ uint32_t SCACSearch(MpmCtx *mpm_ctx, MpmThreadCtx *mpm_thread_ctx, PatternMatcherQueue *pmq, uint8_t *buf, uint16_t buflen) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; int i = 0; int matches = 0; if (ctx->state_count < 65536) { /* \todo tried loop unrolling with register var, with no perf increase. Need * to dig deeper */ /* \todo Change it for stateful MPM. Supply the state using mpm_thread_ctx */ register SC_AC_STATE_TYPE_U16 state = 0; for (i = 0; i < buflen; i++) { state = ctx->state_table_u16[state][buf[i]]; if (ctx->output_table[state].no_of_entries != 0) { uint32_t k = 0; for (k = 0; k < ctx->output_table[state].no_of_entries; k++) { matches += MpmVerifyMatch(mpm_thread_ctx, pmq, ctx->output_table[state].pids[k]); #ifdef SC_AC_COUNTERS if (mpm_thread_ctx->ctx != NULL) { SCACThreadCtx *tctx = (SCACThreadCtx *)mpm_thread_ctx->ctx; tctx->total_matches++; } #endif /* SC_AC_COUNTERS */ } } } /* for (i = 0; i < buflen; i++) */ } else { /* \todo tried loop unrolling with register var, with no perf increase. Need * to dig deeper */ /* \todo Change it for stateful MPM. Supply the state using mpm_thread_ctx */ register SC_AC_STATE_TYPE_U32 state = 0; for (i = 0; i < buflen; i++) { state = ctx->state_table_u32[state][buf[i]]; if (ctx->output_table[state].no_of_entries != 0) { uint32_t k = 0; for (k = 0; k < ctx->output_table[state].no_of_entries; k++) { matches += MpmVerifyMatch(mpm_thread_ctx, pmq, ctx->output_table[state].pids[k]); #ifdef SC_AC_COUNTERS if (mpm_thread_ctx->ctx != NULL) { SCACThreadCtx *tctx = (SCACThreadCtx *)mpm_thread_ctx->ctx; tctx->total_matches++; } #endif /* SC_AC_COUNTERS */ } } } /* for (i = 0; i < buflen; i++) */ } /* else - if (ctx->state_count < 65536) */ #ifdef SC_AC_COUNTERS if (mpm_thread_ctx->ctx != NULL) { SCACThreadCtx *tctx = (SCACThreadCtx *)mpm_thread_ctx->ctx; tctx->total_calls++; } #endif /* SC_AC_COUNTERS */ return matches; } /** * \brief Add a case insensitive pattern. Although we have different calls for * adding case sensitive and insensitive patterns, we make a single call * for either case. No special treatment for either case. * * \param mpm_ctx Pointer to the mpm context. * \param pat The pattern to add. * \param patnen The pattern length. * \param offset Ignored. * \param depth Ignored. * \param pid The pattern id. * \param sid Ignored. * \param flags Flags associated with this pattern. * * \retval 0 On success. * \retval -1 On failure. */ int SCACAddPatternCI(MpmCtx *mpm_ctx, uint8_t *pat, uint16_t patlen, uint16_t offset, uint16_t depth, uint32_t pid, uint32_t sid, uint8_t flags) { flags |= MPM_PATTERN_FLAG_NOCASE; return SCACAddPattern(mpm_ctx, pat, patlen, offset, depth, pid, sid, flags); } /** * \brief Add a case sensitive pattern. Although we have different calls for * adding case sensitive and insensitive patterns, we make a single call * for either case. No special treatment for either case. * * \param mpm_ctx Pointer to the mpm context. * \param pat The pattern to add. * \param patnen The pattern length. * \param offset Ignored. * \param depth Ignored. * \param pid The pattern id. * \param sid Ignored. * \param flags Flags associated with this pattern. * * \retval 0 On success. * \retval -1 On failure. */ int SCACAddPatternCS(MpmCtx *mpm_ctx, uint8_t *pat, uint16_t patlen, uint16_t offset, uint16_t depth, uint32_t pid, uint32_t sid, uint8_t flags) { return SCACAddPattern(mpm_ctx, pat, patlen, offset, depth, pid, sid, flags); } void SCACPrintSearchStats(MpmThreadCtx *mpm_thread_ctx) { #ifdef SC_AC_COUNTERS SCACThreadCtx *ctx = (SCACThreadCtx *)mpm_thread_ctx->ctx; printf("AC Thread Search stats (ctx %p)\n", ctx); printf("Total calls: %" PRIu32 "\n", ctx->total_calls); printf("Total matches: %" PRIu64 "\n", ctx->total_matches); #endif /* SC_AC_COUNTERS */ return; } void SCACPrintInfo(MpmCtx *mpm_ctx) { SCACCtx *ctx = (SCACCtx *)mpm_ctx->ctx; printf("MPM AC Information:\n"); printf("Memory allocs: %" PRIu32 "\n", mpm_ctx->memory_cnt); printf("Memory alloced: %" PRIu32 "\n", mpm_ctx->memory_size); printf(" Sizeof:\n"); printf(" MpmCtx %" PRIuMAX "\n", (uintmax_t)sizeof(MpmCtx)); printf(" SCACCtx: %" PRIuMAX "\n", (uintmax_t)sizeof(SCACCtx)); printf(" SCACPattern %" PRIuMAX "\n", (uintmax_t)sizeof(SCACPattern)); printf(" SCACPattern %" PRIuMAX "\n", (uintmax_t)sizeof(SCACPattern)); printf("Unique Patterns: %" PRIu32 "\n", mpm_ctx->pattern_cnt); printf("Smallest: %" PRIu32 "\n", mpm_ctx->minlen); printf("Largest: %" PRIu32 "\n", mpm_ctx->maxlen); printf("Total states in the state table: %" PRIu32 "\n", ctx->state_count); printf("\n"); return; } /*************************************Unittests********************************/ #ifdef UNITTESTS static int SCACTest01(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcd", 4, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghjiklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest02(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abce", 4, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghjiklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 0) result = 1; else printf("0 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest03(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcd", 4, 0, 0, 0, 0, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"bcde", 4, 0, 0, 1, 0, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"fghj", 4, 0, 0, 2, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghjiklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 3) result = 1; else printf("3 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest04(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcd", 4, 0, 0, 0, 0, 0); SCACAddPatternCS(&mpm_ctx, (uint8_t *)"bcdegh", 6, 0, 0, 1, 0, 0); SCACAddPatternCS(&mpm_ctx, (uint8_t *)"fghjxyz", 7, 0, 0, 2, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghjiklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest05(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); SCACAddPatternCI(&mpm_ctx, (uint8_t *)"ABCD", 4, 0, 0, 0, 0, 0); SCACAddPatternCI(&mpm_ctx, (uint8_t *)"bCdEfG", 6, 0, 0, 1, 0, 0); SCACAddPatternCI(&mpm_ctx, (uint8_t *)"fghJikl", 7, 0, 0, 2, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghjiklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 3) result = 1; else printf("3 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest06(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcd", 4, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcd"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest07(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* should match 30 times */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"A", 1, 0, 0, 0, 0, 0); /* should match 29 times */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AA", 2, 0, 0, 1, 0, 0); /* should match 28 times */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AAA", 3, 0, 0, 2, 0, 0); /* 26 */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AAAAA", 5, 0, 0, 3, 0, 0); /* 21 */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AAAAAAAAAA", 10, 0, 0, 4, 0, 0); /* 1 */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", 30, 0, 0, 5, 0, 0); /* total matches: 135 */ SCACPreparePatterns(&mpm_ctx); char *buf = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 135) result = 1; else printf("135 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest08(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcd", 4, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)"a", 1); if (cnt == 0) result = 1; else printf("0 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest09(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"ab", 2, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)"ab", 2); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest10(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcdefgh", 8, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "01234567890123456789012345678901234567890123456789" "01234567890123456789012345678901234567890123456789" "abcdefgh" "01234567890123456789012345678901234567890123456789" "01234567890123456789012345678901234567890123456789"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest11(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); if (SCACAddPatternCS(&mpm_ctx, (uint8_t *)"he", 2, 0, 0, 1, 0, 0) == -1) goto end; if (SCACAddPatternCS(&mpm_ctx, (uint8_t *)"she", 3, 0, 0, 2, 0, 0) == -1) goto end; if (SCACAddPatternCS(&mpm_ctx, (uint8_t *)"his", 3, 0, 0, 3, 0, 0) == -1) goto end; if (SCACAddPatternCS(&mpm_ctx, (uint8_t *)"hers", 4, 0, 0, 4, 0, 0) == -1) goto end; if (SCACPreparePatterns(&mpm_ctx) == -1) goto end; result = 1; char *buf = "he"; result &= (SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)) == 1); buf = "she"; result &= (SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)) == 2); buf = "his"; result &= (SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)) == 1); buf = "hers"; result &= (SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)) == 2); end: SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest12(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"wxyz", 4, 0, 0, 0, 0, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"vwxyz", 5, 0, 0, 1, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 2) result = 1; else printf("2 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest13(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ char *pat = "abcdefghijklmnopqrstuvwxyzABCD"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyzABCD"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest14(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ char *pat = "abcdefghijklmnopqrstuvwxyzABCDE"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyzABCDE"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest15(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ char *pat = "abcdefghijklmnopqrstuvwxyzABCDEF"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyzABCDEF"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest16(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ char *pat = "abcdefghijklmnopqrstuvwxyzABC"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyzABC"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest17(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ char *pat = "abcdefghijklmnopqrstuvwxyzAB"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyzAB"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest18(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ char *pat = "abcde""fghij""klmno""pqrst""uvwxy""z"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcde""fghij""klmno""pqrst""uvwxy""z"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest19(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 */ char *pat = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); return result; } static int SCACTest20(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 */ char *pat = "AAAAA""AAAAA""AAAAA""AAAAA""AAAAA""AAAAA""AA"; SCACAddPatternCS(&mpm_ctx, (uint8_t *)pat, strlen(pat), 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "AAAAA""AAAAA""AAAAA""AAAAA""AAAAA""AAAAA""AA"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest21(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AA", 2, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)"AA", 2); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest22(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcd", 4, 0, 0, 0, 0, 0); /* 1 match */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"abcde", 5, 0, 0, 1, 0, 0); SCACPreparePatterns(&mpm_ctx); char *buf = "abcdefghijklmnopqrstuvwxyz"; uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)buf, strlen(buf)); if (cnt == 2) result = 1; else printf("2 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest23(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 */ SCACAddPatternCS(&mpm_ctx, (uint8_t *)"AA", 2, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)"aa", 2); if (cnt == 0) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } static int SCACTest24(void) { int result = 0; MpmCtx mpm_ctx; MpmThreadCtx mpm_thread_ctx; memset(&mpm_ctx, 0x00, sizeof(MpmCtx)); memset(&mpm_thread_ctx, 0, sizeof(MpmThreadCtx)); MpmInitCtx(&mpm_ctx, MPM_AC, -1); SCACInitThreadCtx(&mpm_ctx, &mpm_thread_ctx, 0); /* 1 */ SCACAddPatternCI(&mpm_ctx, (uint8_t *)"AA", 2, 0, 0, 0, 0, 0); SCACPreparePatterns(&mpm_ctx); uint32_t cnt = SCACSearch(&mpm_ctx, &mpm_thread_ctx, NULL, (uint8_t *)"aa", 2); if (cnt == 1) result = 1; else printf("1 != %" PRIu32 " ",cnt); SCACDestroyCtx(&mpm_ctx); SCACDestroyThreadCtx(&mpm_ctx, &mpm_thread_ctx); return result; } #endif /* UNITTESTS */ void SCACRegisterTests(void) { #ifdef UNITTESTS UtRegisterTest("SCACTest01", SCACTest01, 1); UtRegisterTest("SCACTest02", SCACTest02, 1); UtRegisterTest("SCACTest03", SCACTest03, 1); UtRegisterTest("SCACTest04", SCACTest04, 1); UtRegisterTest("SCACTest05", SCACTest05, 1); UtRegisterTest("SCACTest06", SCACTest06, 1); UtRegisterTest("SCACTest07", SCACTest07, 1); UtRegisterTest("SCACTest08", SCACTest08, 1); UtRegisterTest("SCACTest09", SCACTest09, 1); UtRegisterTest("SCACTest10", SCACTest10, 1); UtRegisterTest("SCACTest11", SCACTest11, 1); UtRegisterTest("SCACTest12", SCACTest12, 1); UtRegisterTest("SCACTest13", SCACTest13, 1); UtRegisterTest("SCACTest14", SCACTest14, 1); UtRegisterTest("SCACTest15", SCACTest15, 1); UtRegisterTest("SCACTest16", SCACTest16, 1); UtRegisterTest("SCACTest17", SCACTest17, 1); UtRegisterTest("SCACTest18", SCACTest18, 1); UtRegisterTest("SCACTest19", SCACTest19, 1); UtRegisterTest("SCACTest20", SCACTest20, 1); UtRegisterTest("SCACTest21", SCACTest21, 1); UtRegisterTest("SCACTest22", SCACTest22, 1); UtRegisterTest("SCACTest23", SCACTest23, 1); UtRegisterTest("SCACTest24", SCACTest24, 1); #endif return; }