Mercurial > urweb
view src/c/request.c @ 1001:1d456a06ea4e
Add tuple pattern-matching at the constructor level
author | Adam Chlipala <adamc@hcoop.net> |
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date | Tue, 20 Oct 2009 10:19:00 -0400 |
parents | 6304f5e8fbb4 |
children | 83d8ddd09d95 |
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#define _GNU_SOURCE #include <stdio.h> #include <string.h> #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <unistd.h> #include <signal.h> #include <pthread.h> #include <mhash.h> #include "urweb.h" #define MAX_RETRIES 5 static int try_rollback(uw_context ctx, void *logger_data, uw_logger log_error) { int r = uw_rollback(ctx); if (r) { log_error(logger_data, "Error running SQL ROLLBACK\n"); uw_reset(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Error running SQL ROLLBACK\n"); } return r; } uw_context uw_request_new_context(void *logger_data, uw_logger log_error, uw_logger log_debug) { uw_context ctx = uw_init(); int retries_left = MAX_RETRIES; while (1) { failure_kind fk = uw_begin_init(ctx); if (fk == SUCCESS) { log_debug(logger_data, "Database connection initialized.\n"); break; } else if (fk == BOUNDED_RETRY) { if (retries_left) { log_debug(logger_data, "Initialization error triggers bounded retry: %s\n", uw_error_message(ctx)); --retries_left; } else { log_error(logger_data, "Fatal initialization error (out of retries): %s\n", uw_error_message(ctx)); uw_free(ctx); return NULL; } } else if (fk == UNLIMITED_RETRY) log_debug(logger_data, "Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx)); else if (fk == FATAL) { log_error(logger_data, "Fatal initialization error: %s\n", uw_error_message(ctx)); uw_free(ctx); return NULL; } else { log_error(logger_data, "Unknown uw_begin_init return code!\n"); uw_free(ctx); return NULL; } } return ctx; } #define KEYSIZE 16 #define PASSSIZE 4 #define HASH_ALGORITHM MHASH_SHA256 #define HASH_BLOCKSIZE 32 #define KEYGEN_ALGORITHM KEYGEN_MCRYPT int uw_hash_blocksize = HASH_BLOCKSIZE; static int password[PASSSIZE]; static unsigned char private_key[KEYSIZE]; static void init_crypto(void *logger_data, uw_logger log_error) { KEYGEN kg = {{HASH_ALGORITHM, HASH_ALGORITHM}}; int i; assert(mhash_get_block_size(HASH_ALGORITHM) == HASH_BLOCKSIZE); for (i = 0; i < PASSSIZE; ++i) password[i] = rand(); if (mhash_keygen_ext(KEYGEN_ALGORITHM, kg, private_key, sizeof(private_key), (unsigned char*)password, sizeof(password)) < 0) { log_error(logger_data, "Key generation failed\n"); exit(1); } } void uw_request_init(void *logger_data, uw_logger log_error, uw_logger log_debug) { uw_context ctx; failure_kind fk; uw_global_init(); ctx = uw_request_new_context(logger_data, log_error, log_debug); if (!ctx) exit(1); for (fk = uw_initialize(ctx); fk == UNLIMITED_RETRY; fk = uw_initialize(ctx)) { log_debug(logger_data, "Unlimited retry during init: %s\n", uw_error_message(ctx)); uw_db_rollback(ctx); uw_reset(ctx); } if (fk != SUCCESS) { log_error(logger_data, "Failed to initialize database! %s\n", uw_error_message(ctx)); uw_db_rollback(ctx); exit(1); } uw_free(ctx); init_crypto(logger_data, log_error); } void uw_sign(const char *in, char *out) { MHASH td; td = mhash_hmac_init(HASH_ALGORITHM, private_key, sizeof(private_key), mhash_get_hash_pblock(HASH_ALGORITHM)); mhash(td, in, strlen(in)); if (mhash_hmac_deinit(td, out) < 0) fprintf(stderr, "Signing failed\n"); } typedef struct uw_rc { size_t path_copy_size; char *path_copy; } *uw_request_context; uw_request_context uw_new_request_context(void) { uw_request_context r = malloc(sizeof(struct uw_rc)); r->path_copy_size = 0; r->path_copy = malloc(0); return r; } void uw_free_request_context(uw_request_context r) { free(r->path_copy); free(r); } extern char *uw_url_prefix; request_result uw_request(uw_request_context rc, uw_context ctx, char *method, char *path, char *query_string, char *body, size_t body_len, void (*on_success)(uw_context), void (*on_failure)(uw_context), void *logger_data, uw_logger log_error, uw_logger log_debug, int sock, int (*send)(int sockfd, const void *buf, size_t len), int (*close)(int fd)) { int retries_left = MAX_RETRIES; char *s; failure_kind fk; int is_post = 0, do_normal_send = 1; char *boundary = NULL; size_t boundary_len; char *inputs; if (!strcmp(method, "POST")) { char *clen_s = uw_Basis_requestHeader(ctx, "Content-length"); if (!clen_s) { log_error(logger_data, "No Content-length with POST\n"); return FAILED; } int clen = atoi(clen_s); if (clen < 0) { log_error(logger_data, "Negative Content-length with POST\n"); return FAILED; } if (body_len < clen) { log_error(logger_data, "Request doesn't contain all POST data (according to Content-Length)\n"); return FAILED; } is_post = 1; clen_s = uw_Basis_requestHeader(ctx, "Content-type"); if (clen_s && !strncasecmp(clen_s, "multipart/form-data", 19)) { if (strncasecmp(clen_s + 19, "; boundary=", 11)) { log_error(logger_data, "Bad multipart boundary spec"); return FAILED; } boundary = clen_s + 28; boundary[0] = '-'; boundary[1] = '-'; boundary_len = strlen(boundary); } } else if (strcmp(method, "GET")) { log_error(logger_data, "Not ready for non-GET/POST command: %s\n", method); return FAILED; } if (!strncmp(path, uw_url_prefix, strlen(uw_url_prefix)) && !strcmp(path + strlen(uw_url_prefix), ".msgs")) { char *id = uw_Basis_requestHeader(ctx, "UrWeb-Client"); char *pass = uw_Basis_requestHeader(ctx, "UrWeb-Pass"); if (sock < 0) { log_error(logger_data, ".msgs requested, but not socket supplied\n"); return FAILED; } if (id && pass) { unsigned idn = atoi(id); uw_client_connect(idn, atoi(pass), sock, send, close, logger_data, log_error); log_error(logger_data, "Processed request for messages by client %u\n\n", idn); return KEEP_OPEN; } else { log_error(logger_data, "Missing fields in .msgs request: %s, %s\n\n", id, pass); return FAILED; } } if (boundary) { char *part = body, *after_sub_headers, *header, *after_header; size_t part_len; part = strstr(part, boundary); if (!part) { log_error(logger_data, "Missing first multipart boundary\n"); return FAILED; } part += boundary_len; while (1) { char *name = NULL, *filename = NULL, *type = NULL; if (part[0] == '-' && part[1] == '-') break; if (*part != '\r') { log_error(logger_data, "No \\r after multipart boundary\n"); return FAILED; } ++part; if (*part != '\n') { log_error(logger_data, "No \\n after multipart boundary\n"); return FAILED; } ++part; if (!(after_sub_headers = strstr(part, "\r\n\r\n"))) { log_error(logger_data, "Missing end of headers after multipart boundary\n"); return FAILED; } after_sub_headers[2] = 0; after_sub_headers += 4; for (header = part; after_header = strstr(header, "\r\n"); header = after_header + 2) { char *colon, *after_colon; *after_header = 0; if (!(colon = strchr(header, ':'))) { log_error(logger_data, "Missing colon in multipart sub-header\n"); return FAILED; } *colon++ = 0; if (*colon++ != ' ') { log_error(logger_data, "No space after colon in multipart sub-header\n"); return FAILED; } if (!strcasecmp(header, "Content-Disposition")) { if (strncmp(colon, "form-data; ", 11)) { log_error(logger_data, "Multipart data is not \"form-data\"\n"); return FAILED; } for (colon += 11; after_colon = strchr(colon, '='); colon = after_colon) { char *data; after_colon[0] = 0; if (after_colon[1] != '"') { log_error(logger_data, "Disposition setting is missing initial quote\n"); return FAILED; } data = after_colon+2; if (!(after_colon = strchr(data, '"'))) { log_error(logger_data, "Disposition setting is missing final quote\n"); return FAILED; } after_colon[0] = 0; ++after_colon; if (after_colon[0] == ';' && after_colon[1] == ' ') after_colon += 2; if (!strcasecmp(colon, "name")) name = data; else if (!strcasecmp(colon, "filename")) filename = data; } } else if (!strcasecmp(header, "Content-Type")) { type = colon; } } part = memmem(after_sub_headers, body + body_len - after_sub_headers, boundary, boundary_len); if (!part) { log_error(logger_data, "Missing boundary after multipart payload\n"); return FAILED; } part[-2] = 0; part_len = part - after_sub_headers - 2; part[0] = 0; part += boundary_len; if (filename) { uw_Basis_file f = {filename, type, {part_len, after_sub_headers}}; if (uw_set_file_input(ctx, name, f)) { log_error(logger_data, "%s\n", uw_error_message(ctx)); return FAILED; } } else if (uw_set_input(ctx, name, after_sub_headers)) { log_error(logger_data, "%s\n", uw_error_message(ctx)); return FAILED; } } } else { inputs = is_post ? body : query_string; if (inputs) { char *name, *value; while (*inputs) { name = inputs; if (inputs = strchr(inputs, '&')) *inputs++ = 0; else inputs = strchr(name, 0); if (value = strchr(name, '=')) { *value++ = 0; if (uw_set_input(ctx, name, value)) { log_error(logger_data, "%s\n", uw_error_message(ctx)); return FAILED; } } else if (uw_set_input(ctx, name, "")) { log_error(logger_data, "%s\n", uw_error_message(ctx)); return FAILED; } } } } log_debug(logger_data, "Serving URI %s....\n", path); while (1) { size_t path_len = strlen(path); on_success(ctx); if (path_len + 1 > rc->path_copy_size) { rc->path_copy_size = path_len + 1; rc->path_copy = realloc(rc->path_copy, rc->path_copy_size); } strcpy(rc->path_copy, path); fk = uw_begin(ctx, rc->path_copy); if (fk == SUCCESS || fk == RETURN_BLOB) { uw_commit(ctx); return SERVED; } else if (fk == BOUNDED_RETRY) { if (retries_left) { log_debug(logger_data, "Error triggers bounded retry: %s\n", uw_error_message(ctx)); --retries_left; } else { log_error(logger_data, "Fatal error (out of retries): %s\n", uw_error_message(ctx)); try_rollback(ctx, logger_data, log_error); uw_reset_keep_error_message(ctx); on_failure(ctx); uw_write_header(ctx, "Content-type: text/plain\r\n"); uw_write(ctx, "Fatal error (out of retries): "); uw_write(ctx, uw_error_message(ctx)); uw_write(ctx, "\n"); return FAILED; } } else if (fk == UNLIMITED_RETRY) log_debug(logger_data, "Error triggers unlimited retry: %s\n", uw_error_message(ctx)); else if (fk == FATAL) { log_error(logger_data, "Fatal error: %s\n", uw_error_message(ctx)); try_rollback(ctx, logger_data, log_error); uw_reset_keep_error_message(ctx); on_failure(ctx); uw_write_header(ctx, "Content-type: text/html\r\n"); uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>"); uw_write(ctx, "Fatal error: "); uw_write(ctx, uw_error_message(ctx)); uw_write(ctx, "\n</body></html>"); return FAILED; } else { log_error(logger_data, "Unknown uw_handle return code!\n"); try_rollback(ctx, logger_data, log_error); uw_reset_keep_request(ctx); on_failure(ctx); uw_write_header(ctx, "Content-type: text/plain\r\n"); uw_write(ctx, "Unknown uw_handle return code!\n"); return FAILED; } if (try_rollback(ctx, logger_data, log_error)) return FAILED; uw_reset_keep_request(ctx); } } typedef struct { void *logger_data; uw_logger log_error, log_debug; } loggers; void *client_pruner(void *data) { loggers *ls = (loggers *)data; uw_context ctx = uw_request_new_context(ls->logger_data, ls->log_error, ls->log_debug); if (!ctx) exit(1); while (1) { uw_prune_clients(ctx); sleep(5); } }