/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2004 Pawel Jakub Dawidek * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #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 #include #include #include "ggate.h" #define GGATED_EXPORT_FILE "/etc/gg.exports" struct ggd_connection { off_t c_mediasize; unsigned c_sectorsize; unsigned c_flags; /* flags (RO/RW) */ int c_diskfd; int c_sendfd; int c_recvfd; time_t c_birthtime; char *c_path; uint64_t c_token; in_addr_t c_srcip; LIST_ENTRY(ggd_connection) c_next; }; struct ggd_request { struct g_gate_hdr r_hdr; char *r_data; TAILQ_ENTRY(ggd_request) r_next; }; #define r_cmd r_hdr.gh_cmd #define r_offset r_hdr.gh_offset #define r_length r_hdr.gh_length #define r_error r_hdr.gh_error struct ggd_export { char *e_path; /* path to device/file */ in_addr_t e_ip; /* remote IP address */ in_addr_t e_mask; /* IP mask */ unsigned e_flags; /* flags (RO/RW) */ SLIST_ENTRY(ggd_export) e_next; }; static const char *exports_file = GGATED_EXPORT_FILE; static int got_sighup = 0; static in_addr_t bindaddr; static TAILQ_HEAD(, ggd_request) inqueue = TAILQ_HEAD_INITIALIZER(inqueue); static TAILQ_HEAD(, ggd_request) outqueue = TAILQ_HEAD_INITIALIZER(outqueue); static pthread_mutex_t inqueue_mtx, outqueue_mtx; static pthread_cond_t inqueue_cond, outqueue_cond; static SLIST_HEAD(, ggd_export) exports = SLIST_HEAD_INITIALIZER(exports); static LIST_HEAD(, ggd_connection) connections = LIST_HEAD_INITIALIZER(connections); static void *recv_thread(void *arg); static void *disk_thread(void *arg); static void *send_thread(void *arg); static void usage(void) { fprintf(stderr, "usage: %s [-nv] [-a address] [-F pidfile] [-p port] " "[-R rcvbuf] [-S sndbuf] [exports file]\n", getprogname()); exit(EXIT_FAILURE); } static char * ip2str(in_addr_t ip) { static char sip[16]; snprintf(sip, sizeof(sip), "%u.%u.%u.%u", ((ip >> 24) & 0xff), ((ip >> 16) & 0xff), ((ip >> 8) & 0xff), (ip & 0xff)); return (sip); } static in_addr_t countmask(unsigned m) { in_addr_t mask; if (m == 0) { mask = 0x0; } else { mask = 1 << (32 - m); mask--; mask = ~mask; } return (mask); } static void line_parse(char *line, unsigned lineno) { struct ggd_export *ex; char *word, *path, *sflags; unsigned flags, i, vmask; in_addr_t ip, mask; ip = mask = flags = vmask = 0; path = NULL; sflags = NULL; for (i = 0, word = strtok(line, " \t"); word != NULL; i++, word = strtok(NULL, " \t")) { switch (i) { case 0: /* IP address or host name */ ip = g_gate_str2ip(strsep(&word, "/")); if (ip == INADDR_NONE) { g_gate_xlog("Invalid IP/host name at line %u.", lineno); } ip = ntohl(ip); if (word == NULL) vmask = 32; else { errno = 0; vmask = strtoul(word, NULL, 10); if (vmask == 0 && errno != 0) { g_gate_xlog("Invalid IP mask value at " "line %u.", lineno); } if ((unsigned)vmask > 32) { g_gate_xlog("Invalid IP mask value at line %u.", lineno); } } mask = countmask(vmask); break; case 1: /* flags */ if (strcasecmp("rd", word) == 0 || strcasecmp("ro", word) == 0) { flags = O_RDONLY; } else if (strcasecmp("wo", word) == 0) { flags = O_WRONLY; } else if (strcasecmp("rw", word) == 0) { flags = O_RDWR; } else { g_gate_xlog("Invalid value in flags field at " "line %u.", lineno); } sflags = word; break; case 2: /* path */ if (strlen(word) >= MAXPATHLEN) { g_gate_xlog("Path too long at line %u. ", lineno); } path = word; break; default: g_gate_xlog("Too many arguments at line %u. ", lineno); } } if (i != 3) g_gate_xlog("Too few arguments at line %u.", lineno); ex = malloc(sizeof(*ex)); if (ex == NULL) g_gate_xlog("Not enough memory."); ex->e_path = strdup(path); if (ex->e_path == NULL) g_gate_xlog("Not enough memory."); /* Made 'and' here. */ ex->e_ip = (ip & mask); ex->e_mask = mask; ex->e_flags = flags; SLIST_INSERT_HEAD(&exports, ex, e_next); g_gate_log(LOG_DEBUG, "Added %s/%u %s %s to exports list.", ip2str(ex->e_ip), vmask, path, sflags); } static void exports_clear(void) { struct ggd_export *ex; while (!SLIST_EMPTY(&exports)) { ex = SLIST_FIRST(&exports); SLIST_REMOVE_HEAD(&exports, e_next); free(ex); } } #define EXPORTS_LINE_SIZE 2048 static void exports_get(void) { char buf[EXPORTS_LINE_SIZE], *line; unsigned lineno = 0, objs = 0, len; FILE *fd; exports_clear(); fd = fopen(exports_file, "r"); if (fd == NULL) { g_gate_xlog("Cannot open exports file (%s): %s.", exports_file, strerror(errno)); } g_gate_log(LOG_INFO, "Reading exports file (%s).", exports_file); for (;;) { if (fgets(buf, sizeof(buf), fd) == NULL) { if (feof(fd)) break; g_gate_xlog("Error while reading exports file: %s.", strerror(errno)); } /* Increase line count. */ lineno++; /* Skip spaces and tabs. */ for (line = buf; *line == ' ' || *line == '\t'; ++line) ; /* Empty line, comment or empty line at the end of file. */ if (*line == '\n' || *line == '#' || *line == '\0') continue; len = strlen(line); if (line[len - 1] == '\n') { /* Remove new line char. */ line[len - 1] = '\0'; } else { if (!feof(fd)) g_gate_xlog("Line %u too long.", lineno); } line_parse(line, lineno); objs++; } fclose(fd); if (objs == 0) g_gate_xlog("There are no objects to export."); g_gate_log(LOG_INFO, "Exporting %u object(s).", objs); } static int exports_check(struct ggd_export *ex, struct g_gate_cinit *cinit, struct ggd_connection *conn) { char ipmask[32]; /* 32 == strlen("xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx")+1 */ int error = 0, flags; strlcpy(ipmask, ip2str(ex->e_ip), sizeof(ipmask)); strlcat(ipmask, "/", sizeof(ipmask)); strlcat(ipmask, ip2str(ex->e_mask), sizeof(ipmask)); if ((cinit->gc_flags & GGATE_FLAG_RDONLY) != 0) { if (ex->e_flags == O_WRONLY) { g_gate_log(LOG_WARNING, "Read-only access requested, " "but %s (%s) is exported write-only.", ex->e_path, ipmask); return (EPERM); } else { conn->c_flags |= GGATE_FLAG_RDONLY; } } else if ((cinit->gc_flags & GGATE_FLAG_WRONLY) != 0) { if (ex->e_flags == O_RDONLY) { g_gate_log(LOG_WARNING, "Write-only access requested, " "but %s (%s) is exported read-only.", ex->e_path, ipmask); return (EPERM); } else { conn->c_flags |= GGATE_FLAG_WRONLY; } } else { if (ex->e_flags == O_RDONLY) { g_gate_log(LOG_WARNING, "Read-write access requested, " "but %s (%s) is exported read-only.", ex->e_path, ipmask); return (EPERM); } else if (ex->e_flags == O_WRONLY) { g_gate_log(LOG_WARNING, "Read-write access requested, " "but %s (%s) is exported write-only.", ex->e_path, ipmask); return (EPERM); } } if ((conn->c_flags & GGATE_FLAG_RDONLY) != 0) flags = O_RDONLY; else if ((conn->c_flags & GGATE_FLAG_WRONLY) != 0) flags = O_WRONLY; else flags = O_RDWR; conn->c_diskfd = open(ex->e_path, flags); if (conn->c_diskfd == -1) { error = errno; g_gate_log(LOG_ERR, "Cannot open %s: %s.", ex->e_path, strerror(error)); return (error); } return (0); } static struct ggd_export * exports_find(struct sockaddr *s, struct g_gate_cinit *cinit, struct ggd_connection *conn) { struct ggd_export *ex; in_addr_t ip; int error; ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr); SLIST_FOREACH(ex, &exports, e_next) { if ((ip & ex->e_mask) != ex->e_ip) { g_gate_log(LOG_DEBUG, "exports[%s]: IP mismatch.", ex->e_path); continue; } if (strcmp(cinit->gc_path, ex->e_path) != 0) { g_gate_log(LOG_DEBUG, "exports[%s]: Path mismatch.", ex->e_path); continue; } error = exports_check(ex, cinit, conn); if (error == 0) return (ex); else { errno = error; return (NULL); } } g_gate_log(LOG_WARNING, "Unauthorized connection from: %s.", ip2str(ip)); errno = EPERM; return (NULL); } /* * Remove timed out connections. */ static void connection_cleanups(void) { struct ggd_connection *conn, *tconn; time_t now; time(&now); LIST_FOREACH_SAFE(conn, &connections, c_next, tconn) { if (now - conn->c_birthtime > 10) { LIST_REMOVE(conn, c_next); g_gate_log(LOG_NOTICE, "Connection from %s [%s] removed.", ip2str(conn->c_srcip), conn->c_path); close(conn->c_diskfd); close(conn->c_sendfd); close(conn->c_recvfd); free(conn->c_path); free(conn); } } } static struct ggd_connection * connection_find(struct g_gate_cinit *cinit) { struct ggd_connection *conn; LIST_FOREACH(conn, &connections, c_next) { if (conn->c_token == cinit->gc_token) break; } return (conn); } static struct ggd_connection * connection_new(struct g_gate_cinit *cinit, struct sockaddr *s, int sfd) { struct ggd_connection *conn; in_addr_t ip; /* * First, look for old connections. * We probably should do it every X seconds, but what for? * It is only dangerous if an attacker wants to overload connections * queue, so here is a good place to do the cleanups. */ connection_cleanups(); conn = malloc(sizeof(*conn)); if (conn == NULL) return (NULL); conn->c_path = strdup(cinit->gc_path); if (conn->c_path == NULL) { free(conn); return (NULL); } conn->c_token = cinit->gc_token; ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr); conn->c_srcip = ip; conn->c_sendfd = conn->c_recvfd = -1; if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0) conn->c_sendfd = sfd; else conn->c_recvfd = sfd; conn->c_mediasize = 0; conn->c_sectorsize = 0; time(&conn->c_birthtime); conn->c_flags = cinit->gc_flags; LIST_INSERT_HEAD(&connections, conn, c_next); g_gate_log(LOG_DEBUG, "Connection created [%s, %s].", ip2str(ip), conn->c_path); return (conn); } static int connection_add(struct ggd_connection *conn, struct g_gate_cinit *cinit, struct sockaddr *s, int sfd) { in_addr_t ip; ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr); if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0) { if (conn->c_sendfd != -1) { g_gate_log(LOG_WARNING, "Send socket already exists [%s, %s].", ip2str(ip), conn->c_path); return (EEXIST); } conn->c_sendfd = sfd; } else { if (conn->c_recvfd != -1) { g_gate_log(LOG_WARNING, "Receive socket already exists [%s, %s].", ip2str(ip), conn->c_path); return (EEXIST); } conn->c_recvfd = sfd; } g_gate_log(LOG_DEBUG, "Connection added [%s, %s].", ip2str(ip), conn->c_path); return (0); } /* * Remove one socket from the given connection or the whole * connection if sfd == -1. */ static void connection_remove(struct ggd_connection *conn) { LIST_REMOVE(conn, c_next); g_gate_log(LOG_DEBUG, "Connection removed [%s %s].", ip2str(conn->c_srcip), conn->c_path); if (conn->c_sendfd != -1) close(conn->c_sendfd); if (conn->c_recvfd != -1) close(conn->c_recvfd); free(conn->c_path); free(conn); } static int connection_ready(struct ggd_connection *conn) { return (conn->c_sendfd != -1 && conn->c_recvfd != -1); } static void connection_launch(struct ggd_connection *conn) { pthread_t td; int error, pid; pid = fork(); if (pid > 0) return; else if (pid == -1) { g_gate_log(LOG_ERR, "Cannot fork: %s.", strerror(errno)); return; } g_gate_log(LOG_DEBUG, "Process created [%s].", conn->c_path); /* * Create condition variables and mutexes for in-queue and out-queue * synchronization. */ error = pthread_mutex_init(&inqueue_mtx, NULL); if (error != 0) { g_gate_xlog("pthread_mutex_init(inqueue_mtx): %s.", strerror(error)); } error = pthread_cond_init(&inqueue_cond, NULL); if (error != 0) { g_gate_xlog("pthread_cond_init(inqueue_cond): %s.", strerror(error)); } error = pthread_mutex_init(&outqueue_mtx, NULL); if (error != 0) { g_gate_xlog("pthread_mutex_init(outqueue_mtx): %s.", strerror(error)); } error = pthread_cond_init(&outqueue_cond, NULL); if (error != 0) { g_gate_xlog("pthread_cond_init(outqueue_cond): %s.", strerror(error)); } /* * Create threads: * recvtd - thread for receiving I/O request * diskio - thread for doing I/O request * sendtd - thread for sending I/O requests back */ error = pthread_create(&td, NULL, send_thread, conn); if (error != 0) { g_gate_xlog("pthread_create(send_thread): %s.", strerror(error)); } error = pthread_create(&td, NULL, recv_thread, conn); if (error != 0) { g_gate_xlog("pthread_create(recv_thread): %s.", strerror(error)); } disk_thread(conn); } static void sendfail(int sfd, int error, const char *fmt, ...) { struct g_gate_sinit sinit; va_list ap; ssize_t data; sinit.gs_error = error; g_gate_swap2n_sinit(&sinit); data = g_gate_send(sfd, &sinit, sizeof(sinit), 0); g_gate_swap2h_sinit(&sinit); if (data != sizeof(sinit)) { g_gate_log(LOG_WARNING, "Cannot send initial packet: %s.", strerror(errno)); return; } if (fmt != NULL) { va_start(ap, fmt); g_gate_vlog(LOG_WARNING, fmt, ap); va_end(ap); } } static void * malloc_waitok(size_t size) { void *p; while ((p = malloc(size)) == NULL) { g_gate_log(LOG_DEBUG, "Cannot allocate %zu bytes.", size); sleep(1); } return (p); } static void * recv_thread(void *arg) { struct ggd_connection *conn; struct ggd_request *req; ssize_t data; int error, fd; conn = arg; g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path); fd = conn->c_recvfd; for (;;) { /* * Get header packet. */ req = malloc_waitok(sizeof(*req)); data = g_gate_recv(fd, &req->r_hdr, sizeof(req->r_hdr), MSG_WAITALL); if (data == 0) { g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid()); exit(EXIT_SUCCESS); } else if (data == -1) { g_gate_xlog("Error while receiving hdr packet: %s.", strerror(errno)); } else if (data != sizeof(req->r_hdr)) { g_gate_xlog("Malformed hdr packet received."); } g_gate_log(LOG_DEBUG, "Received hdr packet."); g_gate_swap2h_hdr(&req->r_hdr); g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__, (intmax_t)req->r_offset, (unsigned)req->r_length); /* * Allocate memory for data. */ req->r_data = malloc_waitok(req->r_length); /* * Receive data to write for WRITE request. */ if (req->r_cmd == GGATE_CMD_WRITE) { g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...", req->r_length); data = g_gate_recv(fd, req->r_data, req->r_length, MSG_WAITALL); if (data == -1) { g_gate_xlog("Error while receiving data: %s.", strerror(errno)); } } /* * Put the request onto the incoming queue. */ error = pthread_mutex_lock(&inqueue_mtx); assert(error == 0); TAILQ_INSERT_TAIL(&inqueue, req, r_next); error = pthread_cond_signal(&inqueue_cond); assert(error == 0); error = pthread_mutex_unlock(&inqueue_mtx); assert(error == 0); } } static void * disk_thread(void *arg) { struct ggd_connection *conn; struct ggd_request *req; ssize_t data; int error, fd; conn = arg; g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path); fd = conn->c_diskfd; for (;;) { /* * Get a request from the incoming queue. */ error = pthread_mutex_lock(&inqueue_mtx); assert(error == 0); while ((req = TAILQ_FIRST(&inqueue)) == NULL) { error = pthread_cond_wait(&inqueue_cond, &inqueue_mtx); assert(error == 0); } TAILQ_REMOVE(&inqueue, req, r_next); error = pthread_mutex_unlock(&inqueue_mtx); assert(error == 0); /* * Check the request. */ assert(req->r_cmd == GGATE_CMD_READ || req->r_cmd == GGATE_CMD_WRITE); assert(req->r_offset + req->r_length <= (uintmax_t)conn->c_mediasize); assert((req->r_offset % conn->c_sectorsize) == 0); assert((req->r_length % conn->c_sectorsize) == 0); g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__, (intmax_t)req->r_offset, (unsigned)req->r_length); /* * Do the request. */ data = 0; switch (req->r_cmd) { case GGATE_CMD_READ: data = pread(fd, req->r_data, req->r_length, req->r_offset); break; case GGATE_CMD_WRITE: data = pwrite(fd, req->r_data, req->r_length, req->r_offset); /* Free data memory here - better sooner. */ free(req->r_data); req->r_data = NULL; break; } if (data != (ssize_t)req->r_length) { /* Report short reads/writes as I/O errors. */ if (errno == 0) errno = EIO; g_gate_log(LOG_ERR, "Disk error: %s", strerror(errno)); req->r_error = errno; if (req->r_data != NULL) { free(req->r_data); req->r_data = NULL; } } /* * Put the request onto the outgoing queue. */ error = pthread_mutex_lock(&outqueue_mtx); assert(error == 0); TAILQ_INSERT_TAIL(&outqueue, req, r_next); error = pthread_cond_signal(&outqueue_cond); assert(error == 0); error = pthread_mutex_unlock(&outqueue_mtx); assert(error == 0); } /* NOTREACHED */ return (NULL); } static void * send_thread(void *arg) { struct ggd_connection *conn; struct ggd_request *req; ssize_t data; int error, fd; conn = arg; g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path); fd = conn->c_sendfd; for (;;) { /* * Get a request from the outgoing queue. */ error = pthread_mutex_lock(&outqueue_mtx); assert(error == 0); while ((req = TAILQ_FIRST(&outqueue)) == NULL) { error = pthread_cond_wait(&outqueue_cond, &outqueue_mtx); assert(error == 0); } TAILQ_REMOVE(&outqueue, req, r_next); error = pthread_mutex_unlock(&outqueue_mtx); assert(error == 0); g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__, (intmax_t)req->r_offset, (unsigned)req->r_length); /* * Send the request. */ g_gate_swap2n_hdr(&req->r_hdr); if (g_gate_send(fd, &req->r_hdr, sizeof(req->r_hdr), 0) == -1) { g_gate_xlog("Error while sending hdr packet: %s.", strerror(errno)); } g_gate_log(LOG_DEBUG, "Sent hdr packet."); g_gate_swap2h_hdr(&req->r_hdr); if (req->r_data != NULL) { data = g_gate_send(fd, req->r_data, req->r_length, 0); if (data != (ssize_t)req->r_length) { g_gate_xlog("Error while sending data: %s.", strerror(errno)); } g_gate_log(LOG_DEBUG, "Sent %zd bytes (offset=%ju, size=%zu).", data, (uintmax_t)req->r_offset, (size_t)req->r_length); free(req->r_data); } free(req); } /* NOTREACHED */ return (NULL); } static void log_connection(struct sockaddr *from) { in_addr_t ip; ip = htonl(((struct sockaddr_in *)(void *)from)->sin_addr.s_addr); g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip)); } static int handshake(struct sockaddr *from, int sfd) { struct g_gate_version ver; struct g_gate_cinit cinit; struct g_gate_sinit sinit; struct ggd_connection *conn; struct ggd_export *ex; ssize_t data; log_connection(from); /* * Phase 1: Version verification. */ g_gate_log(LOG_DEBUG, "Receiving version packet."); data = g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL); g_gate_swap2h_version(&ver); if (data != sizeof(ver)) { g_gate_log(LOG_WARNING, "Malformed version packet."); return (0); } g_gate_log(LOG_DEBUG, "Version packet received."); if (memcmp(ver.gv_magic, GGATE_MAGIC, strlen(GGATE_MAGIC)) != 0) { g_gate_log(LOG_WARNING, "Invalid magic field."); return (0); } if (ver.gv_version != GGATE_VERSION) { g_gate_log(LOG_WARNING, "Version %u is not supported.", ver.gv_version); return (0); } ver.gv_error = 0; g_gate_swap2n_version(&ver); data = g_gate_send(sfd, &ver, sizeof(ver), 0); g_gate_swap2h_version(&ver); if (data == -1) { sendfail(sfd, errno, "Error while sending version packet: %s.", strerror(errno)); return (0); } /* * Phase 2: Request verification. */ g_gate_log(LOG_DEBUG, "Receiving initial packet."); data = g_gate_recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL); g_gate_swap2h_cinit(&cinit); if (data != sizeof(cinit)) { g_gate_log(LOG_WARNING, "Malformed initial packet."); return (0); } g_gate_log(LOG_DEBUG, "Initial packet received."); conn = connection_find(&cinit); if (conn != NULL) { /* * Connection should already exists. */ g_gate_log(LOG_DEBUG, "Found existing connection (token=%lu).", (unsigned long)conn->c_token); if (connection_add(conn, &cinit, from, sfd) == -1) { connection_remove(conn); return (0); } } else { /* * New connection, allocate space. */ conn = connection_new(&cinit, from, sfd); if (conn == NULL) { sendfail(sfd, ENOMEM, "Cannot allocate new connection."); return (0); } g_gate_log(LOG_DEBUG, "New connection created (token=%lu).", (unsigned long)conn->c_token); } ex = exports_find(from, &cinit, conn); if (ex == NULL) { sendfail(sfd, errno, NULL); connection_remove(conn); return (0); } if (conn->c_mediasize == 0) { conn->c_mediasize = g_gate_mediasize(conn->c_diskfd); conn->c_sectorsize = g_gate_sectorsize(conn->c_diskfd); } sinit.gs_mediasize = conn->c_mediasize; sinit.gs_sectorsize = conn->c_sectorsize; sinit.gs_error = 0; g_gate_log(LOG_DEBUG, "Sending initial packet."); g_gate_swap2n_sinit(&sinit); data = g_gate_send(sfd, &sinit, sizeof(sinit), 0); g_gate_swap2h_sinit(&sinit); if (data == -1) { sendfail(sfd, errno, "Error while sending initial packet: %s.", strerror(errno)); return (0); } if (connection_ready(conn)) { connection_launch(conn); connection_remove(conn); } return (1); } static void huphandler(int sig __unused) { got_sighup = 1; } int main(int argc, char *argv[]) { const char *ggated_pidfile = _PATH_VARRUN "/ggated.pid"; struct pidfh *pfh; struct sockaddr_in serv; struct sockaddr from; socklen_t fromlen; pid_t otherpid; int ch, sfd, tmpsfd; unsigned port; bindaddr = htonl(INADDR_ANY); port = G_GATE_PORT; while ((ch = getopt(argc, argv, "a:hnp:F:R:S:v")) != -1) { switch (ch) { case 'a': bindaddr = g_gate_str2ip(optarg); if (bindaddr == INADDR_NONE) { errx(EXIT_FAILURE, "Invalid IP/host name to bind to."); } break; case 'F': ggated_pidfile = optarg; break; case 'n': nagle = 0; break; case 'p': errno = 0; port = strtoul(optarg, NULL, 10); if (port == 0 && errno != 0) errx(EXIT_FAILURE, "Invalid port."); break; case 'R': errno = 0; rcvbuf = strtoul(optarg, NULL, 10); if (rcvbuf == 0 && errno != 0) errx(EXIT_FAILURE, "Invalid rcvbuf."); break; case 'S': errno = 0; sndbuf = strtoul(optarg, NULL, 10); if (sndbuf == 0 && errno != 0) errx(EXIT_FAILURE, "Invalid sndbuf."); break; case 'v': g_gate_verbose++; break; case 'h': default: usage(); } } argc -= optind; argv += optind; if (argv[0] != NULL) exports_file = argv[0]; exports_get(); pfh = pidfile_open(ggated_pidfile, 0600, &otherpid); if (pfh == NULL) { if (errno == EEXIST) { errx(EXIT_FAILURE, "Daemon already running, pid: %jd.", (intmax_t)otherpid); } err(EXIT_FAILURE, "Cannot open/create pidfile"); } if (!g_gate_verbose) { /* Run in daemon mode. */ if (daemon(0, 0) == -1) g_gate_xlog("Cannot daemonize: %s", strerror(errno)); } pidfile_write(pfh); signal(SIGCHLD, SIG_IGN); sfd = socket(AF_INET, SOCK_STREAM, 0); if (sfd == -1) g_gate_xlog("Cannot open stream socket: %s.", strerror(errno)); bzero(&serv, sizeof(serv)); serv.sin_family = AF_INET; serv.sin_addr.s_addr = bindaddr; serv.sin_port = htons(port); g_gate_socket_settings(sfd); if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1) g_gate_xlog("bind(): %s.", strerror(errno)); if (listen(sfd, 5) == -1) g_gate_xlog("listen(): %s.", strerror(errno)); g_gate_log(LOG_INFO, "Listen on port: %d.", port); signal(SIGHUP, huphandler); for (;;) { fromlen = sizeof(from); tmpsfd = accept(sfd, &from, &fromlen); if (tmpsfd == -1) g_gate_xlog("accept(): %s.", strerror(errno)); if (got_sighup) { got_sighup = 0; exports_get(); } if (!handshake(&from, tmpsfd)) close(tmpsfd); } close(sfd); pidfile_remove(pfh); exit(EXIT_SUCCESS); }