diff options
-rw-r--r-- | Makefile | 1 | ||||
-rw-r--r-- | pacredir.c | 215 |
2 files changed, 131 insertions, 85 deletions
@@ -7,6 +7,7 @@ CP := cp RM := rm SED := sed CFLAGS += -O2 -Wall -Werror +CFLAGS += -lpthread CFLAGS += $(shell pkg-config --libs --cflags libcurl) CFLAGS += $(shell pkg-config --libs --cflags avahi-client) CFLAGS += $(shell pkg-config --libs --cflags libmicrohttpd) @@ -5,6 +5,7 @@ * of the GNU General Public License, incorporated herein by reference. */ +/* glibc headers */ #include <arpa/inet.h> #include <assert.h> #include <math.h> @@ -17,14 +18,18 @@ #include <sys/stat.h> #include <time.h> +/* Avahi headers */ #include <avahi-client/lookup.h> #include <avahi-common/error.h> #include <avahi-common/simple-watch.h> +/* various headers needing linker options */ #include <curl/curl.h> #include <iniparser.h> #include <microhttpd.h> +#include <pthread.h> +/* compile time configuration */ #include "config.h" /* services */ @@ -54,6 +59,22 @@ struct ignore_interfaces { struct ignore_interfaces * next; }; +/* request */ +struct request { + /* host name */ + const char * host; + /* port */ + uint16_t port; + /* pointer to bad */ + __time_t * bad; + /* url */ + char * url; + /* HTTP status code */ + long http_code; + /* last modified timestamp */ + long last_modified; +}; + /* global variables */ struct hosts * hosts = NULL; struct ignore_interfaces * ignore_interfaces = NULL; @@ -98,7 +119,7 @@ int add_host(const char * host, const char * type) { tmphosts->pacserve.bad = 0; tmphosts->pacdbserve.online = 0; tmphosts->pacdbserve.bad = 0; - tmphosts->next = realloc(tmphosts->next, sizeof(struct hosts)); + tmphosts->next = malloc(sizeof(struct hosts)); tmphosts->next->host = NULL; tmphosts->next->next = NULL; @@ -207,14 +228,16 @@ static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UN } /*** get_http_code ***/ -int get_http_code(const char * host, const uint16_t port, const char * url, long * http_code, long * last_modified) { +static void * get_http_code(void * data) { + struct request * request = (struct request *)data; CURL *curl; CURLcode res; + struct timeval tv; - curl_global_init(CURL_GLOBAL_ALL); + gettimeofday(&tv, NULL); if ((curl = curl_easy_init()) != NULL) { - curl_easy_setopt(curl, CURLOPT_URL, url); + curl_easy_setopt(curl, CURLOPT_URL, request->url); /* example.com is redirected, so we tell libcurl to follow redirection */ curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); /* set user agent */ @@ -223,41 +246,43 @@ int get_http_code(const char * host, const uint16_t port, const char * url, long curl_easy_setopt(curl, CURLOPT_NOBODY, 1L); /* ask for filetime */ curl_easy_setopt(curl, CURLOPT_FILETIME, 1L); - /* set connection timeout to 2 seconds + /* set connection timeout to 5 seconds * if the host needs longer we do not want to use it anyway ;) */ - curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 2L); + curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 5L); + /* time out if connection is established but transfer rate is low + * this should make curl finish after a maximum of 8 seconds */ + curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 1L); + curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 3L); /* perform the request */ if (curl_easy_perform(curl) != CURLE_OK) { - write_log(stderr, "Could not connect to server %s on port %d.\n", host, port); - *http_code = 0; - *last_modified = 0; - return EXIT_FAILURE; + write_log(stderr, "Could not connect to server %s on port %d.\n", request->host, request->port); + request->http_code = 0; + request->last_modified = 0; + *request->bad = tv.tv_sec; + return NULL; } - /* get http code */ - if ((res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, http_code)) != CURLE_OK) { + /* get http status code */ + if ((res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &(request->http_code))) != CURLE_OK) { write_log(stderr, "curl_easy_getinfo() failed: %s\n", curl_easy_strerror(res)); - return EXIT_FAILURE; + return NULL; } /* get last modified time */ - if (*http_code == MHD_HTTP_OK) { - if ((res = curl_easy_getinfo(curl, CURLINFO_FILETIME, last_modified)) != CURLE_OK) { + if (request->http_code == MHD_HTTP_OK) { + if ((res = curl_easy_getinfo(curl, CURLINFO_FILETIME, &(request->last_modified))) != CURLE_OK) { write_log(stderr, "curl_easy_getinfo() failed: %s\n", curl_easy_strerror(res)); - return EXIT_FAILURE; + return NULL; } } else - *last_modified = 0; + request->last_modified = 0; /* always cleanup */ curl_easy_cleanup(curl); } - /* we're done with libcurl, so clean it up */ - curl_global_cleanup(); - - return EXIT_SUCCESS; + return NULL; } /*** ahc_echo *** @@ -269,30 +294,38 @@ static int ahc_echo(void * cls, struct MHD_Connection * connection, const char * int ret; struct hosts * tmphosts = hosts; - char * url = NULL, * url_recent = NULL, * page; + char * url = NULL, * page; const char * basename; struct timeval tv; struct stat fst; char * filename; - unsigned int recent = 0; - long http_code, last_modified, last_modified_recent = 0; + uint8_t dbfile = 0; + int i, error, req_count = -1; + pthread_t * tid = NULL; + struct request ** requests = NULL; + struct request * request = NULL; + long http_code = 0, last_modified = 0; /* we want the filename, not the path */ basename = uri; while (strstr(basename, "/") != NULL) basename = strstr(basename, "/") + 1; + /* unexpected method */ if (strcmp(method, "GET") != 0) - return MHD_NO; /* unexpected method */ + return MHD_NO; + + /* The first time only the headers are valid, + * do not respond in the first round... */ if (&dummy != *ptr) { - /* The first time only the headers are valid, - * do not respond in the first round... */ *ptr = &dummy; return MHD_YES; } + + /* upload data in a GET!? */ if (*upload_data_size != 0) - return MHD_NO; /* upload data in a GET!? */ + return MHD_NO; /* clear context pointer */ *ptr = NULL; @@ -300,77 +333,80 @@ static int ahc_echo(void * cls, struct MHD_Connection * connection, const char * /* process db file (and signature) request */ if ((strlen(basename) > 3 && strcmp(basename + strlen(basename) - 3, ".db") == 0) || (strlen(basename) > 7 && strcmp(basename + strlen(basename) - 7, ".db.sig") == 0)) { + dbfile = 1; /* get timestamp of local file */ filename = malloc(strlen(SYNCPATH) + strlen(basename) + 2); sprintf(filename, SYNCPATH "/%s", basename); - bzero(&fst, sizeof(fst)); if (stat(filename, &fst) != 0) write_log(stderr, "stat() failed, you do not have a local copy of %s\n", basename); else - last_modified_recent = fst.st_mtime; + last_modified = fst.st_mtime; free(filename); + } - /* try to find a server with most recent file */ - while (tmphosts->host != NULL) { - gettimeofday(&tv, NULL); - - /* skip host if offline or had a bad request within last BADTIME seconds */ - if (tmphosts->pacdbserve.online == 0 || tmphosts->pacdbserve.bad + BADTIME > tv.tv_sec) { - tmphosts = tmphosts->next; - continue; - } - - url = realloc(url, 10 + strlen(tmphosts->host) + (log10(PORT_PACDBSERVE)+1) + strlen(basename)); - sprintf(url, "http://%s:%d/%s", tmphosts->host, PORT_PACDBSERVE, basename); - - write_log(stdout, "Trying %s\n", url); - if (get_http_code(tmphosts->host, PORT_PACDBSERVE, url, &http_code, &last_modified) == EXIT_FAILURE) - tmphosts->pacdbserve.bad = tv.tv_sec; - else if (http_code == MHD_HTTP_OK && last_modified > last_modified_recent) { - if (recent > 0) - free(url_recent); - last_modified_recent = last_modified; - url_recent = url; - url = NULL; - recent++; - } + /* try to find a server with most recent file */ + while (tmphosts->host != NULL) { + gettimeofday(&tv, NULL); + /* skip host if offline or had a bad request within last BADTIME seconds */ + if ((dbfile == 1 && (tmphosts->pacdbserve.online == 0 || tmphosts->pacdbserve.bad + BADTIME > tv.tv_sec)) || + (dbfile == 0 && (tmphosts->pacserve.online == 0 || tmphosts->pacserve.bad + BADTIME > tv.tv_sec))) { tmphosts = tmphosts->next; + continue; } - if (url != NULL) { - free(url); - url = NULL; + + /* This is multi-threading code! + * Pointer to struct request does not work as realloc can relocate the data. + * We need a pointer to pointer to struct request, store the addresses in + * an array and give get_http_code() a struct the does not change! */ + req_count++; + tid = realloc(tid, sizeof(pthread_t) * (req_count + 1)); + requests = realloc(requests, sizeof(size_t) * (req_count + 1)); + requests[req_count] = malloc(sizeof(struct request)); + request = requests[req_count]; + + /* prepare request struct */ + request->host = tmphosts->host; + if (dbfile == 1) { + request->port = PORT_PACDBSERVE; + request->bad = &(tmphosts->pacdbserve.bad); + } else { + request->port = PORT_PACSERVE; + request->bad = &(tmphosts->pacserve.bad); } - if (recent > 0) { - http_code = MHD_HTTP_OK; - url = url_recent; - } else - http_code = 0; - /* process package file request */ - } else { - /* try to find a server */ - while (tmphosts->host != NULL) { - gettimeofday(&tv, NULL); - - /* skip host if offline or had a bad request within last BADTIME seconds */ - if (tmphosts->pacserve.online == 0 || tmphosts->pacserve.bad + BADTIME > tv.tv_sec) { - tmphosts = tmphosts->next; - continue; - } + request->url = malloc(10 + strlen(tmphosts->host) + 5 /* max strlen of decimal 16bit value */ + strlen(basename)); + sprintf(request->url, "http://%s:%d/%s", tmphosts->host, dbfile == 1 ? PORT_PACDBSERVE : PORT_PACSERVE, basename); + request->http_code = 0; + request->last_modified = 0; - url = realloc(url, 10 + strlen(tmphosts->host) + (log10(PORT_PACSERVE)+1) + strlen(basename)); - sprintf(url, "http://%s:%d/%s", tmphosts->host, PORT_PACSERVE, basename); + write_log(stdout, "Trying %s\n", request->url); - write_log(stdout, "Trying %s\n", url); - if (get_http_code(tmphosts->host, PORT_PACSERVE, url, &http_code, &last_modified) == EXIT_FAILURE) - tmphosts->pacserve.bad = tv.tv_sec; - else if (http_code == MHD_HTTP_OK) - break; + if ((error = pthread_create(&tid[req_count], NULL, get_http_code, (void *)request)) != 0) + write_log(stderr, "Could not run thread number %d, errno %d\n", req_count, error); - tmphosts = tmphosts->next; - } + tmphosts = tmphosts->next; + } + + /* try to find a suitable response */ + for (i = 0; i <= req_count; i++) { + if ((error = pthread_join(tid[i], NULL)) != 0) + write_log(stderr, "Could not join thread number %d, errno %d\n", i, error); + + request = requests[i]; + + if (request->http_code == MHD_HTTP_OK && + (dbfile == 0 || request->last_modified > last_modified)) { + printf("Found: %s\n", request->url); + if (url != NULL) + free(url); + url = request->url; + http_code = MHD_HTTP_OK; + last_modified = request->last_modified; + } else + free(request->url); + free(request); } /* give response */ @@ -381,6 +417,7 @@ static int ahc_echo(void * cls, struct MHD_Connection * connection, const char * response = MHD_create_response_from_data(strlen(page), (void*) page, MHD_NO, MHD_NO); ret = MHD_add_response_header(response, "Location", url); ret = MHD_queue_response(connection, MHD_HTTP_TEMPORARY_REDIRECT, response); + free(url); } else { write_log(stdout, "File %s not found, giving up.\n", basename); page = malloc(strlen(PAGE404) + strlen(basename) + 1); @@ -391,8 +428,10 @@ static int ahc_echo(void * cls, struct MHD_Connection * connection, const char * MHD_destroy_response(response); free(page); - if (url != NULL) - free(url); + if (req_count > -1) { + free(tid); + free(requests); + } return ret; } @@ -445,7 +484,6 @@ int main(int argc, char ** argv) { ignore_interfaces->interface = NULL; ignore_interfaces->next = NULL; - /* parse config file */ if ((ini = iniparser_load(CONFIGFILE)) == NULL) { write_log(stderr, "cannot parse file " CONFIGFILE ", continue anyway\n"); @@ -532,6 +570,9 @@ int main(int argc, char ** argv) { return EXIT_FAILURE; } + /* initialize curl */ + curl_global_init(CURL_GLOBAL_ALL); + /* register signal callbacks */ signal(SIGTERM, sig_callback); signal(SIGINT, sig_callback); @@ -540,8 +581,12 @@ int main(int argc, char ** argv) { /* run the main loop */ avahi_simple_poll_loop(simple_poll); + /* stop http server */ MHD_stop_daemon(mhd); + /* we're done with libcurl, so clean it up */ + curl_global_cleanup(); + ret = EXIT_SUCCESS; fail: |