diff --git a/src/inline-fn.h b/src/inline-fn.h index db1c938..539cd18 100644 --- a/src/inline-fn.h +++ b/src/inline-fn.h @@ -1,294 +1,314 @@ /* * Copyright (C) 2013-2014 Philipp Marek * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This software 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 along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef _INLINE_FN_H #define _INLINE_FN_H #include #include #include #include #include "timer.h" #include "config.h" #include "transport.h" inline static int get_local_id(void) { return local ? local->site_id : -1; } inline static uint32_t get_node_id(struct booth_site *node) { return node ? node->site_id : 0; } /** Returns number of seconds left, if any. */ inline static int term_time_left(struct ticket_config *tk) { int left = 0; if (is_time_set(&tk->term_expires)) { left = time_left(&tk->term_expires); } return (left < 0) ? 0 : left; } inline static int leader_and_valid(struct ticket_config *tk) { if (tk->leader != local) return 0; return term_time_left(tk); } /** Is this some leader? */ inline static int is_owned(const struct ticket_config *tk) { return (tk->leader && tk->leader != no_leader); } inline static int is_resend(struct ticket_config *tk) { timetype now; get_time(&now); return time_sub_int(&now, &tk->req_sent_at) >= tk->timeout; } static inline void init_header_bare(struct boothc_header *h) { timetype now; assert(local && local->site_id); h->magic = htonl(BOOTHC_MAGIC); h->version = htonl(BOOTHC_VERSION); h->from = htonl(local->site_id); if (is_auth_req()) { get_time(&now); h->opts = htonl(BOOTH_OPT_AUTH); h->secs = htonl(secs_since_epoch(&now)); h->usecs = htonl(get_usecs(&now)); } else { h->opts = htonl(0); h->secs = htonl(0); h->usecs = htonl(0); } } /* get the _real_ message length out of the header */ #define sendmsglen(msg) ntohl((msg)->header.length) static inline void init_header(struct boothc_header *h, int cmd, int request, int options, int result, int reason, int data_len) { init_header_bare(h); h->length = htonl(data_len - (is_auth_req() ? 0 : sizeof(struct hmac))); h->cmd = htonl(cmd); h->request = htonl(request); h->options = htonl(options); h->result = htonl(result); h->reason = htonl(reason); } #define my_last_term(tk) \ (((tk)->state == ST_CANDIDATE && (tk)->last_valid_tk) ? \ (tk)->last_valid_tk->current_term : (tk)->current_term) extern int TIME_RES, TIME_MULT; #define msg_term_time(msg) \ ntohl((msg)->ticket.term_valid_for)*TIME_RES/TIME_MULT #define set_msg_term_time(msg, tk) \ (msg)->ticket.term_valid_for = htonl(term_time_left(tk)*TIME_MULT/TIME_RES) static inline void init_ticket_msg(struct boothc_ticket_msg *msg, int cmd, int request, int rv, int reason, struct ticket_config *tk) { assert(sizeof(msg->ticket.id) == sizeof(tk->name)); init_header(&msg->header, cmd, request, 0, rv, reason, sizeof(*msg)); if (!tk) { memset(&msg->ticket, 0, sizeof(msg->ticket)); } else { memcpy(msg->ticket.id, tk->name, sizeof(msg->ticket.id)); msg->ticket.leader = htonl(get_node_id( (tk->leader && tk->leader != no_leader) ? tk->leader : (tk->voted_for ? tk->voted_for : no_leader))); msg->ticket.term = htonl(tk->current_term); set_msg_term_time(msg, tk); } } static inline struct booth_transport const *transport(void) { return booth_transport + booth_conf->proto; } -static inline const char *site_string(struct booth_site *site) +static inline const char *site_string(const struct booth_site *site) { return site ? site->addr_string : "NONE"; } +/** + * @internal + * Parse booth configuration file and store as structured data + * + * @param[in] site subject of TCP/UDP port extraction + * + * @return 0 for "undefined", actual port number otherwise + */ +static inline uint16_t site_port(const struct booth_site *site) +{ + assert(site != NULL); + + return site + ? site->family == AF_INET + ? ntohs(site->sa4.sin_port) + : site->family == AF_INET6 + ? ntohs(site->sa6.sin6_port) + : 0 + : 0; +} static inline const char *ticket_leader_string(struct ticket_config *tk) { return site_string(tk->leader); } /* We allow half of the uint32_t to be used; * half of that below, half of that above the current known "good" value. * 0 UINT32_MAX * |--------------------------+----------------+------------| * | | | * |--------+-------| allowed range * | * current commit index * * So, on overflow it looks like that: * UINT32_MAX 0 * |--------------------------+-----------||---+------------| * | | | * |--------+-------| allowed range * | * current commit index * * This should be possible by using the same datatype and relying * on the under/overflow semantics. * * * Having 30 bits available, and assuming an expire time of * one minute and a (high) commit index step of 64 == 2^6 (because * of weights), we get 2^24 minutes of range - which is ~750 * years. "Should be enough for everybody." */ static inline int index_is_higher_than(uint32_t c_high, uint32_t c_low) { uint32_t diff; if (c_high == c_low) return 0; diff = c_high - c_low; if (diff < UINT32_MAX/4) return 1; diff = c_low - c_high; if (diff < UINT32_MAX/4) return 0; assert(!"commit index out of range - invalid"); } static inline uint32_t index_max2(uint32_t a, uint32_t b) { return index_is_higher_than(a, b) ? a : b; } static inline uint32_t index_max3(uint32_t a, uint32_t b, uint32_t c) { return index_max2( index_max2(a, b), c); } /* only invoked when ticket leader */ static inline void get_next_election_time(struct ticket_config *tk, timetype *next) { assert(tk->leader == local); /* if last_renewal is not set, which is unusual, it may mean * that the ticket never got updated, i.e. nobody acked * ticket updates (say, due to a temporary connection * problem) * we may try a bit later again */ if (!is_time_set(&tk->last_renewal)) { time_reset(next); } else { interval_add(&tk->last_renewal, tk->renewal_freq, next); } /* if delay_commit is earlier than next, then set next to * delay_commit */ if (is_time_set(&tk->delay_commit) && time_cmp(next, &tk->delay_commit, >)) { copy_time(&tk->delay_commit, next); } } static inline void expect_replies(struct ticket_config *tk, int reply_type) { tk->retry_number = 0; tk->acks_expected = reply_type; tk->acks_received = local->bitmask; get_time(&tk->req_sent_at); } static inline void no_resends(struct ticket_config *tk) { tk->retry_number = 0; tk->acks_expected = 0; } static inline struct booth_site *my_vote(struct ticket_config *tk) { return tk->votes_for[ local->index ]; } static inline int count_bits(uint64_t val) { return __builtin_popcount(val); } static inline int majority_of_bits(struct ticket_config *tk, uint64_t val) { /* Use ">" to get majority decision, even for an even number * of participants. */ return count_bits(val) * 2 > booth_conf->site_count; } static inline int all_replied(struct ticket_config *tk) { return !(tk->acks_received ^ booth_conf->all_bits); } static inline int all_sites_replied(struct ticket_config *tk) { return !((tk->acks_received & booth_conf->sites_bits) ^ booth_conf->sites_bits); } #endif diff --git a/src/main.c b/src/main.c index 8d921c5..9b47ec4 100644 --- a/src/main.c +++ b/src/main.c @@ -1,1639 +1,1636 @@ /* * Copyright (C) 2011 Jiaju Zhang * Copyright (C) 2013-2014 Philipp Marek * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This software 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 along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "b_config.h" #if HAVE_LIBGCRYPT #include #endif #ifndef NAMETAG_LIBSYSTEMD #include #else #include "alt/nametag_libsystemd.h" #endif #ifdef COREDUMP_NURSING #include #include #endif #include "log.h" #include "booth.h" #include "config.h" #include "transport.h" #include "inline-fn.h" #include "pacemaker.h" #include "ticket.h" #include "request.h" #include "attr.h" #include "handler.h" #define RELEASE_VERSION "1.0" #define RELEASE_STR RELEASE_VERSION " (build " BOOTH_BUILD_VERSION ")" #define CLIENT_NALLOC 32 static int daemonize = 1; int enable_stderr = 0; timetype start_time; /** Structure for "clients". * Filehandles with incoming data get registered here (and in pollfds), * along with their callbacks. * Because these can be reallocated with every new fd, addressing * happens _only_ by their numeric index. */ struct client *clients = NULL; struct pollfd *pollfds = NULL; static int client_maxi; static int client_size = 0; static const struct booth_site _no_leader = { .addr_string = "none", .site_id = NO_ONE, .index = -1, }; struct booth_site *const no_leader = (struct booth_site*) &_no_leader; typedef enum { BOOTHD_STARTED=0, BOOTHD_STARTING } BOOTH_DAEMON_STATE; int poll_timeout; struct booth_config *booth_conf; struct command_line cl; static void client_alloc(void) { int i; if (!(clients = realloc( clients, (client_size + CLIENT_NALLOC) * sizeof(*clients)) ) || !(pollfds = realloc( pollfds, (client_size + CLIENT_NALLOC) * sizeof(*pollfds)) )) { log_error("can't alloc for client array"); exit(1); } for (i = client_size; i < client_size + CLIENT_NALLOC; i++) { clients[i].workfn = NULL; clients[i].deadfn = NULL; clients[i].fd = -1; pollfds[i].fd = -1; pollfds[i].revents = 0; } client_size += CLIENT_NALLOC; } static void client_dead(int ci) { struct client *c = clients + ci; if (c->fd != -1) { log_debug("removing client %d", c->fd); close(c->fd); } c->fd = -1; c->workfn = NULL; if (c->msg) { free(c->msg); c->msg = NULL; c->offset = 0; } pollfds[ci].fd = -1; } int client_add(int fd, const struct booth_transport *tpt, void (*workfn)(int ci), void (*deadfn)(int ci)) { int i; struct client *c; if (client_size - 1 <= client_maxi ) { client_alloc(); } for (i = 0; i < client_size; i++) { c = clients + i; if (c->fd != -1) continue; c->workfn = workfn; if (deadfn) c->deadfn = deadfn; else c->deadfn = client_dead; c->transport = tpt; c->fd = fd; c->msg = NULL; c->offset = 0; pollfds[i].fd = fd; pollfds[i].events = POLLIN; if (i > client_maxi) client_maxi = i; return i; } assert(!"no client"); } int find_client_by_fd(int fd) { int i; if (fd < 0) return -1; for (i = 0; i <= client_maxi; i++) { if (clients[i].fd == fd) return i; } return -1; } static int format_peers(char **pdata, unsigned int *len) { struct booth_site *s; char *data, *cp; char time_str[64]; int i, alloc; *pdata = NULL; *len = 0; alloc = booth_conf->site_count * (BOOTH_NAME_LEN + 256); data = malloc(alloc); if (!data) return -ENOMEM; cp = data; FOREACH_NODE(i, s) { if (s == local) continue; strftime(time_str, sizeof(time_str), "%F %T", localtime(&s->last_recv)); cp += snprintf(cp, alloc - (cp - data), "%-12s %s, last recv: %s\n", type_to_string(s->type), s->addr_string, time_str); cp += snprintf(cp, alloc - (cp - data), "\tSent pkts:%u error:%u resends:%u\n", s->sent_cnt, s->sent_err_cnt, s->resend_cnt); cp += snprintf(cp, alloc - (cp - data), "\tRecv pkts:%u error:%u authfail:%u invalid:%u\n\n", s->recv_cnt, s->recv_err_cnt, s->sec_cnt, s->invalid_cnt); if (alloc - (cp - data) <= 0) { free(data); return -ENOMEM; } } *pdata = data; *len = cp - data; return 0; } void list_peers(int fd) { char *data; unsigned int olen; struct boothc_hdr_msg hdr; if (format_peers(&data, &olen) < 0) goto out; init_header(&hdr.header, CL_LIST, 0, 0, RLT_SUCCESS, 0, sizeof(hdr) + olen); (void)send_header_plus(fd, &hdr, data, olen); out: if (data) free(data); } /* trim trailing spaces if the key is ascii */ static void trim_key() { char *p; int i; for (i=0, p=booth_conf->authkey; i < booth_conf->authkey_len; i++, p++) if (!isascii(*p)) return; p = booth_conf->authkey; while (booth_conf->authkey_len > 0 && isspace(*p)) { p++; booth_conf->authkey_len--; } memmove(booth_conf->authkey, p, booth_conf->authkey_len); p = booth_conf->authkey + booth_conf->authkey_len - 1; while (booth_conf->authkey_len > 0 && isspace(*p)) { booth_conf->authkey_len--; p--; } } static int read_authkey() { int fd; booth_conf->authkey[0] = '\0'; fd = open(booth_conf->authfile, O_RDONLY); if (fd < 0) { log_error("cannot open %s: %s", booth_conf->authfile, strerror(errno)); return -1; } if (fstat(fd, &booth_conf->authstat) < 0) { log_error("cannot stat authentication file %s (%d): %s", booth_conf->authfile, fd, strerror(errno)); close(fd); return -1; } if (booth_conf->authstat.st_mode & (S_IRGRP | S_IROTH)) { log_error("%s: file shall not be readable for anyone but the owner", booth_conf->authfile); close(fd); return -1; } booth_conf->authkey_len = read(fd, booth_conf->authkey, BOOTH_MAX_KEY_LEN); close(fd); trim_key(); log_debug("read key of size %d in authfile %s", booth_conf->authkey_len, booth_conf->authfile); /* make sure that the key is of minimum length */ return (booth_conf->authkey_len >= BOOTH_MIN_KEY_LEN) ? 0 : -1; } int update_authkey() { struct stat statbuf; if (stat(booth_conf->authfile, &statbuf) < 0) { log_error("cannot stat authentication file %s: %s", booth_conf->authfile, strerror(errno)); return -1; } if (statbuf.st_mtime > booth_conf->authstat.st_mtime) { return read_authkey(); } return 0; } static int setup_config(struct booth_config **conf_pptr, int type) { int rv; assert(conf_pptr != NULL); rv = read_config(conf_pptr, cl.configfile, type); if (rv < 0) goto out; if (is_auth_req()) { rv = read_authkey(); if (rv < 0) goto out; #if HAVE_LIBGCRYPT if (!gcry_check_version(NULL)) { log_error("gcry_check_version"); rv = -ENOENT; goto out; } gcry_control(GCRYCTL_DISABLE_SECMEM, 0); gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0); #endif } /* Set "local" pointer, ignoring errors. */ if (cl.type == DAEMON && cl.site[0]) { if (!find_site_by_name(booth_conf, cl.site, &local, 1)) { log_error("Cannot find \"%s\" in the configuration.", cl.site); return -EINVAL; } local->local = 1; } else find_myself(booth_conf, NULL, type == CLIENT || type == GEOSTORE); rv = check_config(booth_conf, type); if (rv < 0) goto out; /* Per default the PID file name is derived from the * configuration name. */ if (!cl.lockfile[0]) { snprintf(cl.lockfile, sizeof(cl.lockfile) - 1, "%s/%s.pid", BOOTH_RUN_DIR, (*conf_pptr)->name); } out: return rv; } static int setup_transport(void) { int rv; rv = transport()->init(message_recv); if (rv < 0) { log_error("failed to init booth_transport %s", transport()->name); goto out; } rv = booth_transport[TCP].init(NULL); if (rv < 0) { log_error("failed to init booth_transport[TCP]"); goto out; } out: return rv; } static int write_daemon_state(int fd, int state) { char buffer[1024]; int rv, size; size = sizeof(buffer) - 1; rv = snprintf(buffer, size, - "booth_pid=%d " - "booth_state=%s " - "booth_type=%s " - "booth_cfg_name='%s' " - "booth_id=%d " - "booth_addr_string='%s' " - "booth_port=%d\n", - getpid(), - ( state == BOOTHD_STARTED ? "started" : - state == BOOTHD_STARTING ? "starting" : - "invalid"), - type_to_string(local->type), - booth_conf->name, - local->site_id, - local->addr_string, - booth_conf->port); + "booth_pid=%d " + "booth_state=%s " + "booth_type=%s " + "booth_cfg_name='%s' " + "booth_id=%d " + "booth_addr_string='%s' " + "booth_port=%d\n", + getpid(), + ( state == BOOTHD_STARTED ? "started" : + state == BOOTHD_STARTING ? "starting" : "invalid"), + type_to_string(local->type), booth_conf->name, + get_local_id(), site_string(local), + site_port(local)); if (rv < 0 || rv == size) { log_error("Buffer filled up in write_daemon_state()."); return -1; } size = rv; rv = ftruncate(fd, 0); if (rv < 0) { log_error("lockfile %s truncate error %d: %s", cl.lockfile, errno, strerror(errno)); return rv; } rv = lseek(fd, 0, SEEK_SET); if (rv < 0) { log_error("lseek set fd(%d) offset to 0 error, return(%d), message(%s)", fd, rv, strerror(errno)); rv = -1; return rv; } rv = write(fd, buffer, size); if (rv != size) { log_error("write to fd(%d, %d) returned %d, errno %d, message(%s)", fd, size, rv, errno, strerror(errno)); return -1; } return 0; } static int loop(int fd) { void (*workfn) (int ci); void (*deadfn) (int ci); int rv, i; rv = setup_transport(); if (rv < 0) goto fail; rv = setup_ticket(booth_conf); if (rv < 0) goto fail; rv = write_daemon_state(fd, BOOTHD_STARTED); if (rv != 0) { log_error("write daemon state %d to lockfile error %s: %s", BOOTHD_STARTED, cl.lockfile, strerror(errno)); goto fail; } log_info("BOOTH %s daemon started, node id is 0x%08X (%d).", type_to_string(local->type), local->site_id, local->site_id); while (1) { rv = poll(pollfds, client_maxi + 1, poll_timeout); if (rv == -1 && errno == EINTR) continue; if (rv < 0) { log_error("poll failed: %s (%d)", strerror(errno), errno); goto fail; } for (i = 0; i <= client_maxi; i++) { if (clients[i].fd < 0) continue; if (pollfds[i].revents & POLLIN) { workfn = clients[i].workfn; if (workfn) workfn(i); } if (pollfds[i].revents & (POLLERR | POLLHUP | POLLNVAL)) { deadfn = clients[i].deadfn; if (deadfn) deadfn(i); } } process_tickets(); } return 0; fail: return -1; } static int test_reply(cmd_result_t reply_code, cmd_request_t cmd) { int rv = 0; const char *op_str = ""; if (cmd == CMD_GRANT) op_str = "grant"; else if (cmd == CMD_REVOKE) op_str = "revoke"; else if (cmd == CMD_LIST) op_str = "list"; else if (cmd == CMD_PEERS) op_str = "peers"; else { log_error("internal error reading reply result!"); return -1; } switch (reply_code) { case RLT_OVERGRANT: log_info("You're granting a granted ticket. " "If you wanted to migrate a ticket, " "use revoke first, then use grant."); rv = -1; break; case RLT_TICKET_IDLE: log_info("ticket is not owned"); rv = 0; break; case RLT_ASYNC: log_info("%s command sent, result will be returned " "asynchronously. Please use \"booth list\" to " "see the outcome.", op_str); rv = 0; break; case RLT_CIB_PENDING: log_info("%s succeeded (CIB commit pending)", op_str); /* wait for the CIB commit? */ rv = (cl.options & OPT_WAIT_COMMIT) ? 3 : 0; break; case RLT_MORE: rv = 2; break; case RLT_SYNC_SUCC: case RLT_SUCCESS: if (cmd != CMD_LIST && cmd != CMD_PEERS) log_info("%s succeeded!", op_str); rv = 0; break; case RLT_SYNC_FAIL: log_info("%s failed!", op_str); rv = -1; break; case RLT_INVALID_ARG: log_error("ticket \"%s\" does not exist", cl.msg.ticket.id); rv = -1; break; case RLT_AUTH: log_error("authentication error"); rv = -1; break; case RLT_EXT_FAILED: log_error("before-acquire-handler for ticket \"%s\" failed, grant denied", cl.msg.ticket.id); rv = -1; break; case RLT_ATTR_PREREQ: log_error("attr-prereq for ticket \"%s\" failed, grant denied", cl.msg.ticket.id); rv = -1; break; case RLT_REDIRECT: /* talk to another site */ rv = 1; break; default: log_error("got an error code: %x", rv); rv = -1; } return rv; } static int query_get_string_answer(cmd_request_t cmd) { struct booth_site *site; struct boothc_hdr_msg reply; struct boothc_header *header; char *data; int data_len; int rv; struct booth_transport const *tpt; int (*test_reply_f) (cmd_result_t reply_code, cmd_request_t cmd); size_t msg_size; void *request; if (cl.type == GEOSTORE) { test_reply_f = test_attr_reply; msg_size = sizeof(cl.attr_msg); request = &cl.attr_msg; } else { test_reply_f = test_reply; msg_size = sizeof(cl.msg); request = &cl.msg; } header = (struct boothc_header *)request; data = NULL; init_header(header, cmd, 0, cl.options, 0, 0, msg_size); if (!*cl.site) site = local; else if (!find_site_by_name(booth_conf, cl.site, &site, 1)) { log_error("cannot find site \"%s\"", cl.site); rv = ENOENT; goto out; } tpt = booth_transport + TCP; rv = tpt->open(site); if (rv < 0) goto out_close; rv = tpt->send(site, request, msg_size); if (rv < 0) goto out_close; rv = tpt->recv_auth(site, &reply, sizeof(reply)); if (rv < 0) goto out_close; data_len = ntohl(reply.header.length) - rv; /* no attribute, or no ticket found */ if (!data_len) { goto out_test_reply; } data = malloc(data_len+1); if (!data) { rv = -ENOMEM; goto out_close; } rv = tpt->recv(site, data, data_len); if (rv < 0) goto out_close; *(data+data_len) = '\0'; *(data + data_len) = '\0'; (void)fputs(data, stdout); fflush(stdout); rv = 0; out_test_reply: rv = test_reply_f(ntohl(reply.header.result), cmd); out_close: tpt->close(site); out: if (data) free(data); return rv; } static int do_command(cmd_request_t cmd) { struct booth_site *site; struct boothc_ticket_msg reply; struct booth_transport const *tpt; uint32_t leader_id; int rv; int reply_cnt = 0, msg_logged = 0; const char *op_str = ""; if (cmd == CMD_GRANT) op_str = "grant"; else if (cmd == CMD_REVOKE) op_str = "revoke"; rv = 0; site = NULL; /* Always use TCP for client - at least for now. */ tpt = booth_transport + TCP; if (!*cl.site) site = local; else { if (!find_site_by_name(booth_conf, cl.site, &site, 1)) { log_error("Site \"%s\" not configured.", cl.site); goto out_close; } } if (site->type == ARBITRATOR) { if (site == local) { log_error("We're just an arbitrator, cannot grant/revoke tickets here."); } else { log_error("%s is just an arbitrator, cannot grant/revoke tickets there.", cl.site); } goto out_close; } assert(site->type == SITE); /* We don't check for existence of ticket, so that asking can be * done without local configuration, too. * Although, that means that the UDP port has to be specified, too. */ if (!cl.msg.ticket.id[0]) { /* If the loaded configuration has only a single ticket defined, use that. */ if (booth_conf->ticket_count == 1) { strncpy(cl.msg.ticket.id, booth_conf->ticket[0].name, sizeof(cl.msg.ticket.id)); } else { log_error("No ticket given."); goto out_close; } } redirect: init_header(&cl.msg.header, cmd, 0, cl.options, 0, 0, sizeof(cl.msg)); rv = tpt->open(site); if (rv < 0) goto out_close; rv = tpt->send(site, &cl.msg, sendmsglen(&cl.msg)); if (rv < 0) goto out_close; read_more: rv = tpt->recv_auth(site, &reply, sizeof(reply)); if (rv < 0) { /* print any errors depending on the code sent by the * server */ (void)test_reply(ntohl(reply.header.result), cmd); goto out_close; } rv = test_reply(ntohl(reply.header.result), cmd); if (rv == 1) { tpt->close(site); leader_id = ntohl(reply.ticket.leader); if (!find_site_by_id(booth_conf, leader_id, &site)) { log_error("Message with unknown redirect site %x received", leader_id); rv = -1; goto out_close; } goto redirect; } else if (rv == 2 || rv == 3) { /* the server has more to say */ /* don't wait too long */ if (reply_cnt > 1 && !(cl.options & OPT_WAIT)) { rv = 0; log_info("Giving up on waiting for the definite result. " "Please use \"booth list\" later to " "see the outcome."); goto out_close; } if (reply_cnt == 0) { log_info("%s request sent, " "waiting for the result ...", op_str); msg_logged++; } else if (rv == 3 && msg_logged < 2) { log_info("waiting for the CIB commit ..."); msg_logged++; } reply_cnt++; goto read_more; } out_close: if (site) tpt->close(site); return rv; } static int _lockfile(int mode, int *fdp, pid_t *locked_by) { struct flock lock; int fd, rv; /* After reboot the directory may not yet exist. * Try to create it, but ignore errors. */ if (strncmp(cl.lockfile, BOOTH_RUN_DIR, strlen(BOOTH_RUN_DIR)) == 0) mkdir(BOOTH_RUN_DIR, 0775); if (locked_by) *locked_by = 0; *fdp = -1; fd = open(cl.lockfile, mode, 0664); if (fd < 0) return errno; *fdp = fd; lock.l_type = F_WRLCK; lock.l_start = 0; lock.l_whence = SEEK_SET; lock.l_len = 0; lock.l_pid = 0; if (fcntl(fd, F_SETLK, &lock) == 0) return 0; rv = errno; if (locked_by) if (fcntl(fd, F_GETLK, &lock) == 0) *locked_by = lock.l_pid; return rv; } static inline int is_root(void) { return geteuid() == 0; } static int create_lockfile(void) { int rv, fd; fd = -1; rv = _lockfile(O_CREAT | O_WRONLY, &fd, NULL); if (fd == -1) { log_error("lockfile %s open error %d: %s", cl.lockfile, rv, strerror(rv)); return -1; } if (rv < 0) { log_error("lockfile %s setlk error %d: %s", cl.lockfile, rv, strerror(rv)); goto fail; } rv = write_daemon_state(fd, BOOTHD_STARTING); if (rv != 0) { log_error("write daemon state %d to lockfile error %s: %s", BOOTHD_STARTING, cl.lockfile, strerror(errno)); goto fail; } if (is_root()) { if (fchown(fd, booth_conf->uid, booth_conf->gid) < 0) log_error("fchown() on lockfile said %d: %s", errno, strerror(errno)); } return fd; fail: close(fd); return -1; } static void unlink_lockfile(int fd) { unlink(cl.lockfile); close(fd); } static void print_usage(void) { printf( "Usage:\n" " booth list [options]\n" " booth {grant|revoke} [options] \n" " booth status [options]\n" "\n" " list: List all tickets\n" " grant: Grant ticket to site\n" " revoke: Revoke ticket\n" "\n" "Options:\n" " -c FILE Specify config file [default " BOOTH_DEFAULT_CONF "]\n" " Can be a path or just a name without \".conf\" suffix\n" " -s Connect/grant to a different site\n" " -F Try to grant the ticket immediately\n" " even if not all sites are reachable\n" " For manual tickets:\n" " grant a manual ticket even if it has been already granted\n" " -w Wait forever for the outcome of the request\n" " -C Wait until the ticket is committed to the CIB (grant only)\n" " -h Print this help\n" "\n" "Examples:\n" "\n" " # booth list (list tickets)\n" " # booth grant ticket-A (grant ticket here)\n" " # booth grant -s 10.121.8.183 ticket-A (grant ticket to site 10.121.8.183)\n" " # booth revoke ticket-A (revoke ticket)\n" "\n" "See the booth(8) man page for more details.\n" ); } #define OPTION_STRING "c:Dl:t:s:FhSwC" #define ATTR_OPTION_STRING "c:Dt:s:h" void safe_copy(char *dest, char *value, size_t buflen, const char *description) { int content_len = buflen - 1; if (strlen(value) >= content_len) { fprintf(stderr, "'%s' exceeds maximum %s length of %d\n", value, description, content_len); exit(EXIT_FAILURE); } strncpy(dest, value, content_len); dest[content_len] = 0; } static int host_convert(char *hostname, char *ip_str, size_t ip_size) { struct addrinfo *result = NULL, hints = {0}; int re = -1; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET; hints.ai_socktype = SOCK_DGRAM; re = getaddrinfo(hostname, NULL, &hints, &result); if (re == 0) { struct in_addr addr = ((struct sockaddr_in *)result->ai_addr)->sin_addr; const char *re_ntop = inet_ntop(AF_INET, &addr, ip_str, ip_size); if (re_ntop == NULL) { re = -1; } } freeaddrinfo(result); return re; } #define cparg(dest, descr) do { \ if (optind >= argc) \ goto missingarg; \ safe_copy(dest, argv[optind], sizeof(dest), descr); \ optind++; \ } while(0) static int read_arguments(int argc, char **argv) { int optchar; char *arg1 = argv[1]; char *op = NULL; char *cp; const char *opt_string = OPTION_STRING; char site_arg[INET_ADDRSTRLEN] = {0}; int left; cl.type = 0; if ((cp = strstr(argv[0], ATTR_PROG)) && !strcmp(cp, ATTR_PROG)) { cl.type = GEOSTORE; op = argv[1]; optind = 2; opt_string = ATTR_OPTION_STRING; } else if (argc > 1 && (strcmp(arg1, "arbitrator") == 0 || strcmp(arg1, "site") == 0 || strcmp(arg1, "start") == 0 || strcmp(arg1, "daemon") == 0)) { cl.type = DAEMON; optind = 2; } else if (argc > 1 && (strcmp(arg1, "status") == 0)) { cl.type = STATUS; optind = 2; } else if (argc > 1 && (strcmp(arg1, "client") == 0)) { cl.type = CLIENT; if (argc < 3) { print_usage(); exit(EXIT_FAILURE); } op = argv[2]; optind = 3; } if (!cl.type) { cl.type = CLIENT; op = argv[1]; optind = 2; } if (argc < 2 || !strcmp(arg1, "help") || !strcmp(arg1, "--help") || !strcmp(arg1, "-h")) { if (cl.type == GEOSTORE) print_geostore_usage(); else print_usage(); exit(EXIT_SUCCESS); } if (!strcmp(arg1, "version") || !strcmp(arg1, "--version") || !strcmp(arg1, "-V")) { printf("%s %s\n", argv[0], RELEASE_STR); exit(EXIT_SUCCESS); } if (cl.type == CLIENT) { if (!strcmp(op, "list")) cl.op = CMD_LIST; else if (!strcmp(op, "grant")) cl.op = CMD_GRANT; else if (!strcmp(op, "revoke")) cl.op = CMD_REVOKE; else if (!strcmp(op, "peers")) cl.op = CMD_PEERS; else { fprintf(stderr, "client operation \"%s\" is unknown\n", op); exit(EXIT_FAILURE); } } else if (cl.type == GEOSTORE) { if (!strcmp(op, "list")) cl.op = ATTR_LIST; else if (!strcmp(op, "set")) cl.op = ATTR_SET; else if (!strcmp(op, "get")) cl.op = ATTR_GET; else if (!strcmp(op, "delete")) cl.op = ATTR_DEL; else { fprintf(stderr, "attribute operation \"%s\" is unknown\n", op); exit(EXIT_FAILURE); } } while (optind < argc) { optchar = getopt(argc, argv, opt_string); switch (optchar) { case 'c': if (strchr(optarg, '/')) { safe_copy(cl.configfile, optarg, sizeof(cl.configfile), "config file"); } else { /* If no "/" in there, use with default directory. */ strcpy(cl.configfile, BOOTH_DEFAULT_CONF_DIR); cp = cl.configfile + strlen(BOOTH_DEFAULT_CONF_DIR); assert(cp > cl.configfile); assert(*(cp-1) == '/'); /* Write at the \0, ie. after the "/" */ safe_copy(cp, optarg, (sizeof(cl.configfile) - (cp - cl.configfile) - strlen(BOOTH_DEFAULT_CONF_EXT)), "config name"); /* If no extension, append ".conf". * Space is available, see -strlen() above. */ if (!strchr(cp, '.')) strcat(cp, BOOTH_DEFAULT_CONF_EXT); } break; case 'D': debug_level++; break; case 'S': daemonize = 0; enable_stderr = 1; break; case 'l': safe_copy(cl.lockfile, optarg, sizeof(cl.lockfile), "lock file"); break; case 't': if (cl.op == CMD_GRANT || cl.op == CMD_REVOKE) { safe_copy(cl.msg.ticket.id, optarg, sizeof(cl.msg.ticket.id), "ticket name"); } else if (cl.type == GEOSTORE) { safe_copy(cl.attr_msg.attr.tkt_id, optarg, sizeof(cl.attr_msg.attr.tkt_id), "ticket name"); } else { print_usage(); exit(EXIT_FAILURE); } break; case 's': /* For testing and debugging: allow "-s site" also for * daemon start, so that the address that should be used * can be set manually. * This makes it easier to start multiple processes * on one machine. */ if (cl.type == CLIENT || cl.type == GEOSTORE || (cl.type == DAEMON && debug_level)) { if (strcmp(optarg, OTHER_SITE) && host_convert(optarg, site_arg, INET_ADDRSTRLEN) == 0) { safe_copy(cl.site, site_arg, sizeof(cl.site), "site name"); } else { safe_copy(cl.site, optarg, sizeof(cl.site), "site name"); } } else { log_error("\"-s\" not allowed in daemon mode."); exit(EXIT_FAILURE); } break; case 'F': if (cl.type != CLIENT || cl.op != CMD_GRANT) { log_error("use \"-F\" only for client grant"); exit(EXIT_FAILURE); } cl.options |= OPT_IMMEDIATE; break; case 'w': if (cl.type != CLIENT || (cl.op != CMD_GRANT && cl.op != CMD_REVOKE)) { log_error("use \"-w\" only for grant and revoke"); exit(EXIT_FAILURE); } cl.options |= OPT_WAIT; break; case 'C': if (cl.type != CLIENT || cl.op != CMD_GRANT) { log_error("use \"-C\" only for grant"); exit(EXIT_FAILURE); } cl.options |= OPT_WAIT | OPT_WAIT_COMMIT; break; case 'h': if (cl.type == GEOSTORE) print_geostore_usage(); else print_usage(); exit(EXIT_SUCCESS); break; case ':': case '?': fprintf(stderr, "Please use '-h' for usage.\n"); exit(EXIT_FAILURE); break; case -1: /* No more parameters on cmdline, only arguments. */ goto extra_args; default: goto unknown; }; } return 0; extra_args: if (cl.type == CLIENT && !cl.msg.ticket.id[0]) { cparg(cl.msg.ticket.id, "ticket name"); } else if (cl.type == GEOSTORE) { if (cl.op != ATTR_LIST) { cparg(cl.attr_msg.attr.name, "attribute name"); } if (cl.op == ATTR_SET) { cparg(cl.attr_msg.attr.val, "attribute value"); } } if (optind == argc) return 0; left = argc - optind; fprintf(stderr, "Superfluous argument%s: %s%s\n", left == 1 ? "" : "s", argv[optind], left == 1 ? "" : "..."); exit(EXIT_FAILURE); unknown: fprintf(stderr, "unknown option: %s\n", argv[optind]); exit(EXIT_FAILURE); missingarg: fprintf(stderr, "not enough arguments\n"); exit(EXIT_FAILURE); } static void set_scheduler(void) { struct sched_param sched_param; struct rlimit rlimit; int rv; rlimit.rlim_cur = RLIM_INFINITY; rlimit.rlim_max = RLIM_INFINITY; setrlimit(RLIMIT_MEMLOCK, &rlimit); rv = mlockall(MCL_CURRENT | MCL_FUTURE); if (rv < 0) { log_error("mlockall failed"); } rv = sched_get_priority_max(SCHED_RR); if (rv != -1) { sched_param.sched_priority = rv; rv = sched_setscheduler(0, SCHED_RR, &sched_param); if (rv == -1) log_error("could not set SCHED_RR priority %d: %s (%d)", sched_param.sched_priority, strerror(errno), errno); } else { log_error("could not get maximum scheduler priority err %d", errno); } } static int set_procfs_val(const char *path, const char *val) { int rc = -1; FILE *fp = fopen(path, "w"); if (fp) { if (fprintf(fp, "%s", val) > 0) rc = 0; fclose(fp); } return rc; } static int do_status(struct booth_config **conf_pptr, int type) { pid_t pid; int rv, status_lock_fd, ret; const char *reason = NULL; char lockfile_data[1024], *cp; assert(conf_pptr != NULL); ret = PCMK_OCF_NOT_RUNNING; rv = setup_config(conf_pptr, type); if (rv) { reason = "Error reading configuration."; ret = PCMK_OCF_UNKNOWN_ERROR; goto quit; } if (!local) { reason = "No Service IP active here."; goto quit; } rv = _lockfile(O_RDWR, &status_lock_fd, &pid); if (status_lock_fd == -1) { reason = "No PID file."; goto quit; } if (rv == 0) { close(status_lock_fd); reason = "PID file not locked."; goto quit; } if (pid) { fprintf(stdout, "booth_lockpid=%d ", pid); fflush(stdout); } rv = read(status_lock_fd, lockfile_data, sizeof(lockfile_data) - 1); if (rv < 4) { close(status_lock_fd); reason = "Cannot read lockfile data."; ret = PCMK_LSB_UNKNOWN_ERROR; goto quit; } lockfile_data[rv] = 0; close(status_lock_fd); /* Make sure it's only a single line */ cp = strchr(lockfile_data, '\r'); if (cp) *cp = 0; cp = strchr(lockfile_data, '\n'); if (cp) *cp = 0; rv = setup_tcp_listener(1); if (rv == 0) { reason = "TCP port not in use."; goto quit; } fprintf(stdout, "booth_lockfile='%s' %s\n", cl.lockfile, lockfile_data); if (!daemonize) fprintf(stderr, "Booth at %s port %d seems to be running.\n", - local->addr_string, (*conf_pptr)->port); + site_string(local), site_port(local)); return 0; quit: log_debug("not running: %s", reason); /* Ie. "DEBUG" */ if (!daemonize) fprintf(stderr, "not running: %s\n", reason); return ret; } static int limit_this_process(void) { int rv; if (!is_root()) return 0; if (setregid(booth_conf->gid, booth_conf->gid) < 0) { rv = errno; log_error("setregid() didn't work: %s", strerror(rv)); return rv; } if (setreuid(booth_conf->uid, booth_conf->uid) < 0) { rv = errno; log_error("setreuid() didn't work: %s", strerror(rv)); return rv; } return 0; } static int lock_fd = -1; static void server_exit(void) { int rv; if (lock_fd >= 0) { /* We might not be able to delete it, but at least * make it empty. */ rv = ftruncate(lock_fd, 0); (void)rv; unlink_lockfile(lock_fd); } log_info("exiting"); } static void sig_exit_handler(int sig) { log_info("caught signal %d", sig); exit(0); } static int do_server(struct booth_config **conf_pptr, int type) { int rv = -1; static char log_ent[128] = DAEMON_NAME "-"; assert(conf_pptr != NULL); rv = setup_config(conf_pptr, type); if (rv < 0) return rv; if (!local) { log_error("Cannot find myself in the configuration."); exit(EXIT_FAILURE); } if (daemonize) { if (daemon(0, 0) < 0) { perror("daemon error"); exit(EXIT_FAILURE); } } /* The lockfile must be written to _after_ the call to daemon(), so * that the lockfile contains the pid of the daemon, not the parent. */ lock_fd = create_lockfile(); if (lock_fd < 0) return lock_fd; atexit(server_exit); strcat(log_ent, type_to_string(local->type)); cl_log_set_entity(log_ent); cl_log_enable_stderr(enable_stderr ? TRUE : FALSE); cl_log_set_facility(HA_LOG_FACILITY); cl_inherit_logging_environment(0); log_info("BOOTH %s %s daemon is starting", type_to_string(local->type), RELEASE_STR); signal(SIGUSR1, (__sighandler_t)tickets_log_info); signal(SIGTERM, (__sighandler_t)sig_exit_handler); signal(SIGINT, (__sighandler_t)sig_exit_handler); /* we'll handle errors there and then */ signal(SIGPIPE, SIG_IGN); set_scheduler(); /* we don't want to be killed by the OOM-killer */ if (set_procfs_val("/proc/self/oom_score_adj", "-999")) (void)set_procfs_val("/proc/self/oom_adj", "-16"); set_proc_title("%s %s %s for [%s]:%d", DAEMON_NAME, cl.configfile, type_to_string(local->type), - local->addr_string, (*conf_pptr) ->port); + site_string(local), site_port(local)); rv = limit_this_process(); if (rv) return rv; #ifdef COREDUMP_NURSING if (cl_enable_coredumps(TRUE) < 0){ log_error("enabling core dump failed"); } cl_cdtocoredir(); prctl(PR_SET_DUMPABLE, (unsigned long)TRUE, 0UL, 0UL, 0UL); #else if (chdir(BOOTH_CORE_DIR) < 0) { log_error("cannot change working directory to %s", BOOTH_CORE_DIR); } #endif signal(SIGCHLD, (__sighandler_t)wait_child); rv = loop(lock_fd); return rv; } static int do_client(struct booth_config **conf_pptr) { int rv; rv = setup_config(conf_pptr, CLIENT); if (rv < 0) { log_error("cannot read config"); goto out; } switch (cl.op) { case CMD_LIST: case CMD_PEERS: rv = query_get_string_answer(cl.op); break; case CMD_GRANT: case CMD_REVOKE: rv = do_command(cl.op); break; } out: return rv; } static int do_attr(struct booth_config **conf_pptr) { int rv = -1; assert(conf_pptr != NULL); rv = setup_config(conf_pptr, GEOSTORE); if (rv < 0) { log_error("cannot read config"); goto out; } /* We don't check for existence of ticket, so that asking can be * done without local configuration, too. * Although, that means that the UDP port has to be specified, too. */ if (!cl.attr_msg.attr.tkt_id[0]) { /* If the loaded configuration has only a single ticket defined, use that. */ if ((*conf_pptr)->ticket_count == 1) { strncpy(cl.attr_msg.attr.tkt_id, (*conf_pptr)->ticket[0].name, sizeof(cl.attr_msg.attr.tkt_id)); } else { rv = 1; log_error("No ticket given."); goto out; } } switch (cl.op) { case ATTR_LIST: case ATTR_GET: rv = query_get_string_answer(cl.op); break; case ATTR_SET: case ATTR_DEL: rv = do_attr_command(booth_conf, cl.op); break; } out: return rv; } int main(int argc, char *argv[], char *envp[]) { int rv; const char *cp; #ifdef LOGGING_LIBQB enum qb_log_target_slot i; #endif init_set_proc_title(argc, argv, envp); get_time(&start_time); memset(&cl, 0, sizeof(cl)); strncpy(cl.configfile, BOOTH_DEFAULT_CONF, BOOTH_PATH_LEN - 1); cl.lockfile[0] = 0; debug_level = 0; cp = ((cp = strstr(argv[0], ATTR_PROG)) && !strcmp(cp, ATTR_PROG) ? ATTR_PROG : "booth"); #ifndef LOGGING_LIBQB cl_log_set_entity(cp); #else qb_log_init(cp, LOG_USER, LOG_DEBUG); /* prio driven by debug_level */ for (i = QB_LOG_TARGET_START; i < QB_LOG_TARGET_MAX; i++) { if (i == QB_LOG_SYSLOG || i == QB_LOG_BLACKBOX) continue; qb_log_format_set(i, "%t %H %N: [%P]: %p: %b"); } (void) qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_ADD, QB_LOG_FILTER_FILE, "*", LOG_DEBUG); #endif cl_log_enable_stderr(TRUE); cl_log_set_facility(0); rv = read_arguments(argc, argv); if (rv < 0) goto out; switch (cl.type) { case STATUS: rv = do_status(&booth_conf, cl.type); break; case ARBITRATOR: case DAEMON: case SITE: rv = do_server(&booth_conf, cl.type); break; case CLIENT: rv = do_client(&booth_conf); break; case GEOSTORE: rv = do_attr(&booth_conf); break; } out: #ifdef LOGGING_LIBQB qb_log_fini(); #endif /* Normalize values. 0x100 would be seen as "OK" by waitpid(). */ return (rv >= 0 && rv < 0x70) ? rv : 1; } diff --git a/src/transport.c b/src/transport.c index f8dfc46..2efb442 100644 --- a/src/transport.c +++ b/src/transport.c @@ -1,1132 +1,1132 @@ /* * Copyright (C) 2011 Jiaju Zhang * Copyright (C) 2013-2014 Philipp Marek * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This software 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 along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include #include #include /* getnameinfo */ #include #include #include #include #include #include #include #include /* getnameinfo */ #include "b_config.h" #include "config.h" #include "transport.h" #include "attr.h" #include "auth.h" #include "booth.h" #include "inline-fn.h" #include "log.h" #include "ticket.h" #define BOOTH_IPADDR_LEN (sizeof(struct in6_addr)) #define NETLINK_BUFSIZE 16384 #define SOCKET_BUFFER_SIZE 160000 #define FRAME_SIZE_MAX 10000 struct booth_site *local = NULL; /* function to be called when handling booth-group-internal messages; * it's expected to return 0 to indicate success, negative integer * to indicate silent (or possibly already complained about) error, * or positive integer to indicate sender's ID that will then be * emitted in the error log message together with the real source * address if this is available */ static int (*deliver_fn) (void *msg, int msglen); static void parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) { while (RTA_OK(rta, len)) { if (rta->rta_type <= max) tb[rta->rta_type] = rta; rta = RTA_NEXT(rta,len); } } enum match_type { NO_MATCH = 0, FUZZY_MATCH, EXACT_MATCH, }; static int find_address(struct booth_config *conf_ptr, unsigned char ipaddr[BOOTH_IPADDR_LEN], int family, int prefixlen, int fuzzy_allowed, struct booth_site **me, int *address_bits_matched) { int i; struct booth_site *node; int bytes, bits_left, mask; unsigned char node_bits, ip_bits; uint8_t *n_a; int matched; enum match_type did_match = NO_MATCH; assert(conf_ptr != NULL); bytes = prefixlen / 8; bits_left = prefixlen % 8; /* One bit left to check means ignore 7 lowest bits. */ mask = ~( (1 << (8 - bits_left)) -1); for (i = 0; i < conf_ptr->site_count; i++) { node = conf_ptr->site + i; if (family != node->family) continue; n_a = node_to_addr_pointer(node); for(matched = 0; matched < node->addrlen; matched++) if (ipaddr[matched] != n_a[matched]) break; if (matched == node->addrlen) { *address_bits_matched = matched * 8; *me = node; did_match = EXACT_MATCH; break; } if (!fuzzy_allowed) continue; /* Check prefix, whole bytes */ if (matched < bytes) continue; if (matched * 8 < *address_bits_matched) continue; node_bits = n_a[bytes]; ip_bits = ipaddr[bytes]; if (((node_bits ^ ip_bits) & mask) == 0) { /* _At_least_ prefixlen bits matched. */ if (did_match < EXACT_MATCH) { *address_bits_matched = prefixlen; *me = node; did_match = FUZZY_MATCH; } } } return did_match; } static int _find_myself(struct booth_config *conf_ptr, int family, struct booth_site **mep, int fuzzy_allowed) { int fd; struct sockaddr_nl nladdr; struct booth_site *me; unsigned char ipaddr[BOOTH_IPADDR_LEN]; static char rcvbuf[NETLINK_BUFSIZE]; struct { struct nlmsghdr nlh; struct rtgenmsg g; } req; int address_bits_matched; if (local) goto found; me = NULL; address_bits_matched = 0; if (mep) *mep = NULL; fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (fd < 0) { log_error("failed to create netlink socket"); return 0; } setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)); memset(&nladdr, 0, sizeof(nladdr)); nladdr.nl_family = AF_NETLINK; memset(&req, 0, sizeof(req)); req.nlh.nlmsg_len = sizeof(req); req.nlh.nlmsg_type = RTM_GETADDR; req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; req.nlh.nlmsg_pid = 0; req.nlh.nlmsg_seq = 1; req.g.rtgen_family = family; if (sendto(fd, (void *)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr)) < 0) { close(fd); log_error("failed to send data to netlink socket"); return 0; } while (1) { int status; struct nlmsghdr *h; struct iovec iov = { rcvbuf, sizeof(rcvbuf) }; struct msghdr msg = { (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 }; status = recvmsg(fd, &msg, 0); if (!status) { close(fd); log_error("failed to recvmsg from netlink socket"); return 0; } h = (struct nlmsghdr *)rcvbuf; if (h->nlmsg_type == NLMSG_DONE) break; if (h->nlmsg_type == NLMSG_ERROR) { close(fd); log_error("netlink socket recvmsg error"); return 0; } while (NLMSG_OK(h, status)) { if (h->nlmsg_type == RTM_NEWADDR) { struct ifaddrmsg *ifa = NLMSG_DATA(h); struct rtattr *tb[IFA_MAX+1]; int len = h->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)); memset(tb, 0, sizeof(tb)); parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), len); memset(ipaddr, 0, BOOTH_IPADDR_LEN); /* prefer IFA_LOCAL if it exists, for p-t-p * interfaces, otherwise use IFA_ADDRESS */ if (tb[IFA_LOCAL]) { memcpy(ipaddr, RTA_DATA(tb[IFA_LOCAL]), BOOTH_IPADDR_LEN); } else { memcpy(ipaddr, RTA_DATA(tb[IFA_ADDRESS]), BOOTH_IPADDR_LEN); } /* Try to find the exact address or the address with subnet matching. * The function find_address will be called for each address received * from NLMSG_DATA above. * The exact match will be preferred. If no exact match is found, * the function find_address will try to return another, most similar * address (with the longest possible number of same bytes). */ if (ifa->ifa_prefixlen > address_bits_matched) { find_address(conf_ptr, ipaddr, ifa->ifa_family, ifa->ifa_prefixlen, fuzzy_allowed, &me, &address_bits_matched); if (me) { log_debug("found myself at %s (%d bits matched)", site_string(me), address_bits_matched); } } /* If the previous NLMSG_DATA calls have already allowed us * to find an address with address_bits_matched matching bits, * then no other better non-exact address can be found. * But we can still try to find an exact match, so let us * call the function find_address with disabled searching of * similar addresses (fuzzy_allowed == 0) */ else if (ifa->ifa_prefixlen == address_bits_matched) { find_address(conf_ptr, ipaddr, ifa->ifa_family, ifa->ifa_prefixlen, 0 /* fuzzy_allowed */, &me, &address_bits_matched); if (me) { log_debug("found myself at %s (exact match)", site_string(me)); } } } h = NLMSG_NEXT(h, status); } } close(fd); if (!me) return 0; me->local = 1; local = me; found: if (mep) *mep = local; return 1; } int find_myself(struct booth_config *conf_ptr, struct booth_site **mep, int fuzzy_allowed) { return _find_myself(conf_ptr, AF_INET6, mep, fuzzy_allowed) || _find_myself(conf_ptr, AF_INET, mep, fuzzy_allowed); } /** Checks the header fields for validity. * cf. init_header(). * For @len_incl_data < 0 the length is not checked. * Return <0 if error, else bytes read. */ int check_boothc_header(struct boothc_header *h, int len_incl_data) { int l; if (h->magic != htonl(BOOTHC_MAGIC)) { log_error("magic error %x", ntohl(h->magic)); return -EINVAL; } if (h->version != htonl(BOOTHC_VERSION)) { log_error("version error %x", ntohl(h->version)); return -EINVAL; } l = ntohl(h->length); if (l < sizeof(*h)) { log_error("length %d out of range", l); return -EINVAL; } if (len_incl_data < 0) return 0; if (l != len_incl_data) { log_error("length error - got %d, wanted %d", len_incl_data, l); return -EINVAL; } return len_incl_data; } static int do_read(int fd, void *buf, size_t count) { int rv, off = 0; while (off < count) { rv = read(fd, (char *)buf + off, count - off); if (rv == 0) return -1; if (rv == -1 && errno == EINTR) continue; if (rv == -1 && errno == EWOULDBLOCK) break; if (rv == -1) return -1; off += rv; } return off; } static int do_write(int fd, void *buf, size_t count) { int rv, off = 0; retry: rv = send(fd, (char *)buf + off, count, MSG_NOSIGNAL); if (rv == -1 && errno == EINTR) goto retry; /* If we cannot write _any_ data, we'd be in an (potential) loop. */ if (rv <= 0) { log_error("send failed: %s (%d)", strerror(errno), errno); return rv; } if (rv != count) { count -= rv; off += rv; goto retry; } return 0; } /* Only used for client requests (tcp) */ int read_client(struct client *req_cl) { char *msg; struct boothc_header *header; int rv, fd; int len = MAX_MSG_LEN; if (!req_cl->msg) { msg = malloc(MAX_MSG_LEN); if (!msg) { log_error("out of memory for client messages"); return -1; } req_cl->msg = (void *)msg; } else { msg = (char *)req_cl->msg; } header = (struct boothc_header *)msg; /* update len if we read enough */ if (req_cl->offset >= sizeof(*header)) { len = min(ntohl(header->length), MAX_MSG_LEN); } fd = req_cl->fd; rv = do_read(fd, msg+req_cl->offset, len-req_cl->offset); if (rv < 0) { if (errno == ECONNRESET) log_debug("client connection reset for fd %d", fd); return -1; } req_cl->offset += rv; /* update len if we read enough */ if (req_cl->offset >= sizeof(*header)) { len = min(ntohl(header->length), MAX_MSG_LEN); } if (req_cl->offset < len) { /* client promised to send more */ return 1; } if (check_boothc_header(header, len) < 0) { return -1; } return 0; } /* Only used for client requests (tcp) */ static void process_connection(int ci) { struct client *req_cl; void *msg = NULL; struct boothc_header *header; struct boothc_hdr_msg err_reply; cmd_result_t errc; void (*deadfn) (int ci); req_cl = clients + ci; switch (read_client(req_cl)) { case -1: /* error */ goto kill; case 1: /* more to read */ return; case 0: /* we can process the request now */ msg = req_cl->msg; } header = (struct boothc_header *)msg; if (check_auth(NULL, msg, ntohl(header->length))) { errc = RLT_AUTH; goto send_err; } /* For CMD_GRANT and CMD_REVOKE: * Don't close connection immediately, but send * result a second later? */ switch (ntohl(header->cmd)) { case CMD_LIST: ticket_answer_list(req_cl->fd); goto kill; case CMD_PEERS: list_peers(req_cl->fd); goto kill; case CMD_GRANT: case CMD_REVOKE: if (process_client_request(req_cl, msg) == 1) goto kill; /* request processed definitely, close connection */ else return; case ATTR_LIST: case ATTR_GET: case ATTR_SET: case ATTR_DEL: if (process_attr_request(req_cl, msg) == 1) goto kill; /* request processed definitely, close connection */ else return; default: log_error("connection %d cmd %x unknown", ci, ntohl(header->cmd)); errc = RLT_INVALID_ARG; goto send_err; } assert(0); return; send_err: init_header(&err_reply.header, CL_RESULT, 0, 0, errc, 0, sizeof(err_reply)); send_client_msg(req_cl->fd, &err_reply); kill: deadfn = req_cl->deadfn; if(deadfn) { deadfn(ci); } return; } static void process_tcp_listener(int ci) { int fd, i, flags, one = 1; socklen_t addrlen = sizeof(struct sockaddr); struct sockaddr addr; fd = accept(clients[ci].fd, &addr, &addrlen); if (fd < 0) { log_error("process_tcp_listener: accept error %d %d", fd, errno); return; } setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof(one)); flags = fcntl(fd, F_GETFL, 0); fcntl(fd, F_SETFL, flags | O_NONBLOCK); i = client_add(fd, clients[ci].transport, process_connection, NULL); log_debug("client connection %d fd %d", i, fd); } int setup_tcp_listener(int test_only) { int s, rv; int one = 1; s = socket(local->family, SOCK_STREAM, 0); if (s == -1) { log_error("failed to create tcp socket %s", strerror(errno)); return s; } rv = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)); if (rv == -1) { close(s); log_error("failed to set the SO_REUSEADDR option"); return rv; } rv = bind(s, &local->sa6, local->saddrlen); if (test_only) { rv = (rv == -1) ? errno : 0; close(s); return rv; } if (rv == -1) { close(s); log_error("failed to bind socket %s", strerror(errno)); return rv; } rv = listen(s, 5); if (rv == -1) { close(s); log_error("failed to listen on socket %s", strerror(errno)); return rv; } return s; } static int booth_tcp_init(void * unused __attribute__((unused))) { int rv; if (get_local_id() < 0) return -1; rv = setup_tcp_listener(0); if (rv < 0) return rv; client_add(rv, booth_transport + TCP, process_tcp_listener, NULL); return 0; } static int connect_nonb(int sockfd, const struct sockaddr *saptr, socklen_t salen, int sec) { int flags, n, error; socklen_t len; fd_set rset, wset; struct timeval tval; flags = fcntl(sockfd, F_GETFL, 0); fcntl(sockfd, F_SETFL, flags | O_NONBLOCK); error = 0; if ( (n = connect(sockfd, saptr, salen)) < 0) if (errno != EINPROGRESS) return -1; if (n == 0) goto done; /* connect completed immediately */ FD_ZERO(&rset); FD_SET(sockfd, &rset); wset = rset; tval.tv_sec = sec; tval.tv_usec = 0; if ((n = select(sockfd + 1, &rset, &wset, NULL, sec ? &tval : NULL)) == 0) { /* leave outside function to close */ /* timeout */ /* close(sockfd); */ errno = ETIMEDOUT; return -1; } if (FD_ISSET(sockfd, &rset) || FD_ISSET(sockfd, &wset)) { len = sizeof(error); if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) return -1; /* Solaris pending error */ } else { log_error("select error: sockfd not set"); return -1; } done: fcntl(sockfd, F_SETFL, flags); /* restore file status flags */ if (error) { /* leave outside function to close */ /* close(sockfd); */ errno = error; return -1; } return 0; } int booth_tcp_open(struct booth_site *to) { int s, rv; if (to->tcp_fd >= STDERR_FILENO) goto found; s = socket(to->family, SOCK_STREAM, 0); if (s == -1) { log_error("cannot create socket of family %d", to->family); return -1; } rv = connect_nonb(s, (struct sockaddr *)&to->sa6, to->saddrlen, 10); if (rv == -1) { if( errno == ETIMEDOUT) log_error("connect to %s got a timeout", site_string(to)); else log_error("connect to %s got an error: %s", site_string(to), strerror(errno)); goto error; } to->tcp_fd = s; found: return 1; error: if (s >= 0) close(s); return -1; } int booth_tcp_send(struct booth_site *to, void *buf, int len) { int rv; rv = add_hmac(buf, len); if (!rv) rv = do_write(to->tcp_fd, buf, len); return rv; } static int booth_tcp_recv(struct booth_site *from, void *buf, int len) { int got; /* Needs timeouts! */ got = do_read(from->tcp_fd, buf, len); if (got < 0) { log_error("read failed (%d): %s", errno, strerror(errno)); return got; } return got; } static int booth_tcp_recv_auth(struct booth_site *from, void *buf, int len) { int got, total; int payload_len; /* Needs timeouts! */ payload_len = len - sizeof(struct hmac); got = booth_tcp_recv(from, buf, payload_len); if (got < 0) { return got; } total = got; if (is_auth_req()) { got = booth_tcp_recv(from, (unsigned char *)buf+payload_len, sizeof(struct hmac)); if (got != sizeof(struct hmac) || check_auth(from, buf, len)) { return -1; } total += got; } return total; } static int booth_tcp_close(struct booth_site *to) { if (to) { if (to->tcp_fd > STDERR_FILENO) close(to->tcp_fd); to->tcp_fd = -1; } return 0; } static int booth_tcp_exit(void) { return 0; } static int setup_udp_server(void) { int rv, fd; int one = 1; unsigned int recvbuf_size; fd = socket(local->family, SOCK_DGRAM, 0); if (fd == -1) { log_error("failed to create UDP socket %s", strerror(errno)); goto ex; } rv = fcntl(fd, F_SETFL, O_NONBLOCK); if (rv == -1) { log_error("failed to set non-blocking operation " "on UDP socket: %s", strerror(errno)); goto ex; } rv = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)); if (rv == -1) { log_error("failed to set the SO_REUSEADDR option"); goto ex; } rv = bind(fd, (struct sockaddr *)&local->sa6, local->saddrlen); if (rv == -1) { log_error("failed to bind UDP socket to [%s]:%d: %s", - site_string(local), booth_conf->port, - strerror(errno)); + site_string(local), site_port(local), + strerror(errno)); goto ex; } recvbuf_size = SOCKET_BUFFER_SIZE; rv = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &recvbuf_size, sizeof(recvbuf_size)); if (rv == -1) { log_error("failed to set recvbuf size"); goto ex; } local->udp_fd = fd; return 0; ex: if (fd >= 0) close(fd); return -1; } /* Receive/process callback for UDP */ static void process_recv(int ci) { struct sockaddr_storage sa; int rv; socklen_t sa_len; /* beware, the buffer needs to be large enough to accept * a packet */ char buffer[MAX_MSG_LEN]; /* Used for unit tests */ struct boothc_ticket_msg *msg; sa_len = sizeof(sa); msg = (void*)buffer; rv = recvfrom(clients[ci].fd, buffer, sizeof(buffer), MSG_NOSIGNAL | MSG_DONTWAIT, (struct sockaddr *)&sa, &sa_len); if (rv == -1) return; rv = deliver_fn((void*)msg, rv); if (rv > 0) { if (getnameinfo((struct sockaddr *)&sa, sa_len, buffer, sizeof(buffer), NULL, 0, NI_NUMERICHOST) == 0) log_error("unknown sender: %08x (real: %s)", rv, buffer); else log_error("unknown sender: %08x", rv); } } static int booth_udp_init(void *f) { int rv; rv = setup_udp_server(); if (rv < 0) return rv; deliver_fn = f; client_add(local->udp_fd, booth_transport + UDP, process_recv, NULL); return 0; } int booth_udp_send(struct booth_site *to, void *buf, int len) { int rv; to->sent_cnt++; rv = sendto(local->udp_fd, buf, len, MSG_NOSIGNAL, (struct sockaddr *)&to->sa6, to->saddrlen); if (rv == len) { rv = 0; } else if (rv < 0) { to->sent_err_cnt++; log_error("Cannot send to %s: %d %s", site_string(to), errno, strerror(errno)); } else { rv = -1; to->sent_err_cnt++; log_error("Packet sent to %s got truncated", site_string(to)); } return rv; } int booth_udp_send_auth(struct booth_site *to, void *buf, int len) { int rv; rv = add_hmac(buf, len); if (rv < 0) return rv; return booth_udp_send(to, buf, len); } static int booth_udp_broadcast_auth(void *buf, int len) { int i, rv, rvs; struct booth_site *site; if (!booth_conf || !booth_conf->site_count) return -1; rv = add_hmac(buf, len); if (rv < 0) return rv; rvs = 0; FOREACH_NODE(i, site) { if (site != local) { rv = booth_udp_send(site, buf, len); if (!rvs) rvs = rv; } } return rvs; } static int booth_udp_exit(void) { return 0; } /* SCTP transport layer has not been developed yet */ static int booth_sctp_init(void *f __attribute__((unused))) { return 0; } static int booth_sctp_send(struct booth_site * to __attribute__((unused)), void *buf __attribute__((unused)), int len __attribute__((unused))) { return 0; } static int booth_sctp_broadcast(void *buf __attribute__((unused)), int len __attribute__((unused))) { return 0; } static int return_0_booth_site(struct booth_site *v __attribute((unused))) { return 0; } static int return_0(void) { return 0; } const struct booth_transport booth_transport[TRANSPORT_ENTRIES] = { [TCP] = { .name = "TCP", .init = booth_tcp_init, .open = booth_tcp_open, .send = booth_tcp_send, .recv = booth_tcp_recv, .recv_auth = booth_tcp_recv_auth, .close = booth_tcp_close, .exit = booth_tcp_exit }, [UDP] = { .name = "UDP", .init = booth_udp_init, .open = return_0_booth_site, .send = booth_udp_send, .send_auth = booth_udp_send_auth, .close = return_0_booth_site, .broadcast_auth = booth_udp_broadcast_auth, .exit = booth_udp_exit }, [SCTP] = { .name = "SCTP", .init = booth_sctp_init, .open = return_0_booth_site, .send = booth_sctp_send, .broadcast = booth_sctp_broadcast, .exit = return_0, } }; /* data + (datalen-sizeof(struct hmac)) points to struct hmac * i.e. struct hmac is always tacked on the payload */ int add_hmac(void *data, int len) { int rv = 0; #if HAVE_LIBGCRYPT || HAVE_LIBMHASH int payload_len; struct hmac *hp; if (!is_auth_req()) return 0; payload_len = len - sizeof(struct hmac); hp = (struct hmac *)((unsigned char *)data + payload_len); hp->hid = htonl(BOOTH_HASH); memset(hp->hash, 0, BOOTH_MAC_SIZE); rv = calc_hmac(data, payload_len, BOOTH_HASH, hp->hash, booth_conf->authkey, booth_conf->authkey_len); if (rv < 0) { log_error("internal error: cannot calculate mac"); } #endif return rv; } #if HAVE_LIBGCRYPT || HAVE_LIBMHASH /* TODO: we need some client identification for logging */ #define peer_string(p) (p ? site_string(p) : "client") /* verify the validity of timestamp from the header * the timestamp needs to be either greater than the one already * recorded for the site or, and this is checked for clients, * not to be older than booth_conf->maxtimeskew * update the timestamp for the site, if this packet is from a * site */ static int verify_ts(struct booth_site *from, void *buf, int len) { struct boothc_header *h; struct timeval tv, curr_tv, now; if (len < sizeof(*h)) { log_error("%s: packet too short", peer_string(from)); return -1; } h = (struct boothc_header *)buf; tv.tv_sec = ntohl(h->secs); tv.tv_usec = ntohl(h->usecs); if (from) { curr_tv.tv_sec = from->last_secs; curr_tv.tv_usec = from->last_usecs; if (timercmp(&tv, &curr_tv, >)) goto accept; log_warn("%s: packet timestamp older than previous one", site_string(from)); } gettimeofday(&now, NULL); now.tv_sec -= booth_conf->maxtimeskew; if (timercmp(&tv, &now, >)) goto accept; log_error("%s: packet timestamp older than %d seconds", peer_string(from), booth_conf->maxtimeskew); return -1; accept: if (from) { from->last_secs = tv.tv_sec; from->last_usecs = tv.tv_usec; } return 0; } #endif int check_auth(struct booth_site *from, void *buf, int len) { int rv = 0; #if HAVE_LIBGCRYPT || HAVE_LIBMHASH int payload_len; struct hmac *hp; if (!is_auth_req()) return 0; payload_len = len - sizeof(struct hmac); if (payload_len < 0) { log_error("%s: failed to authenticate, packet too short (size:%d)", peer_string(from), len); return -1; } hp = (struct hmac *)((unsigned char *)buf + payload_len); rv = verify_hmac(buf, payload_len, ntohl(hp->hid), hp->hash, booth_conf->authkey, booth_conf->authkey_len); if (!rv) { rv = verify_ts(from, buf, len); } if (rv != 0) { log_error("%s: failed to authenticate", peer_string(from)); } #endif return rv; } int send_data(int fd, void *data, int datalen) { int rv = 0; rv = add_hmac(data, datalen); if (!rv) rv = do_write(fd, data, datalen); return rv; } int send_header_plus(int fd, struct boothc_hdr_msg *msg, void *data, int len) { int rv; rv = send_data(fd, msg, sendmsglen(msg)-len); if (rv >= 0 && len) rv = do_write(fd, data, len); return rv; } /* UDP message receiver (see also deliver_fn declaration's comment) */ int message_recv(struct booth_config *conf_ptr, void *msg, int msglen) { uint32_t from; struct boothc_header *header; struct booth_site *source; header = (struct boothc_header *)msg; from = ntohl(header->from); if (!find_site_by_id(conf_ptr, from, &source)) { /* caller knows the actual source address, pass the (assuredly) positive number and let it report */ from = from ? from : ~from; /* avoid 0 (success) */ return from & (~0U >> 1); /* avoid negative (error code} */ } time(&source->last_recv); source->recv_cnt++; if (check_boothc_header(header, msglen) < 0) { log_error("message from %s receive error", site_string(source)); source->recv_err_cnt++; return -1; } if (check_auth(source, msg, msglen)) { log_error("%s failed to authenticate", site_string(source)); source->sec_cnt++; return -1; } if (ntohl(header->opts) & BOOTH_OPT_ATTR) { /* not used, clients send/retrieve attributes directly * from sites */ return attr_recv(msg, source); } else { return ticket_recv(conf_ptr, msg, source); } }