/* * Oscar File transfer (OFT) and Oscar Direct Connect (ODC). * (ODC is also referred to as DirectIM and IM Image.) * * There are a few static helper functions at the top, then * ODC stuff, then ft stuff. * * I feel like this is a good place to explain OFT, so I'm going to * do just that. Each OFT packet has a header type. I guess this * is pretty similar to the subtype of a SNAC packet. The type * basically tells the other client the meaning of the OFT packet. * There are two distinct types of file transfer, which I usually * call "sendfile" and "getfile." Sendfile is when you send a file * to another AIM user. Getfile is when you share a group of files, * and other users request that you send them the files. * * A typical sendfile file transfer goes like this: * 1) Sender sends a channel 2 ICBM telling the other user that * we want to send them a file. At the same time, we open a * listener socket (this should be done before sending the * ICBM) on some port, and wait for them to connect to us. * The ICBM we sent should contain our IP address and the port * number that we're listening on. * 2) The receiver connects to the sender on the given IP address * and port. After the connection is established, the receiver * sends an ICBM signifying that we are ready and waiting. * 3) The sender sends an OFT PROMPT message over the OFT * connection. * 4) The receiver of the file sends back an exact copy of this * OFT packet, except the cookie is filled in with the cookie * from the ICBM. I think this might be an attempt to verify * that the user that is connected is actually the guy that * we sent the ICBM to. Oh, I've been calling this the ACK. * 5) The sender starts sending raw data across the connection * until the entire file has been sent. * 6) The receiver knows the file is finished because the sender * sent the file size in an earlier OFT packet. So then the * receiver sends the DONE thingy (after filling in the * "received" checksum and size) and closes the connection. */ #define FAIM_INTERNAL #ifdef HAVE_CONFIG_H #include #endif #include #ifndef _WIN32 #include #include #include #include #include /* for aim_odc_initiate */ #include /* for inet_ntoa */ #define G_DIR_SEPARATOR '/' #endif #ifdef _WIN32 #include "win32dep.h" #endif struct aim_odc_intdata { fu8_t cookie[8]; char sn[MAXSNLEN+1]; char ip[22]; }; /** * Convert the directory separator from / (0x2f) to ^A (0x01) * * @param name The filename to convert. */ static void aim_oft_dirconvert_tostupid(char *name) { while (name[0]) { if (name[0] == 0x01) name[0] = G_DIR_SEPARATOR; name++; } } /** * Convert the directory separator from ^A (0x01) to / (0x2f) * * @param name The filename to convert. */ static void aim_oft_dirconvert_fromstupid(char *name) { while (name[0]) { if (name[0] == G_DIR_SEPARATOR) name[0] = 0x01; name++; } } /** * Calculate oft checksum of buffer * * Prevcheck should be 0xFFFF0000 when starting a checksum of a file. The * checksum is kind of a rolling checksum thing, so each time you get bytes * of a file you just call this puppy and it updates the checksum. You can * calculate the checksum of an entire file by calling this in a while or a * for loop, or something. * * Thanks to Graham Booker for providing this improved checksum routine, * which is simpler and should be more accurate than Josh Myer's original * code. -- wtm * * This algorithim works every time I have tried it. The other fails * sometimes. So, AOL who thought this up? It has got to be the weirdest * checksum I have ever seen. * * @param buffer Buffer of data to checksum. Man I'd like to buff her... * @param bufsize Size of buffer. * @param prevcheck Previous checksum. */ faim_export fu32_t aim_oft_checksum_chunk(const fu8_t *buffer, int bufferlen, fu32_t prevcheck) { fu32_t check = (prevcheck >> 16) & 0xffff, oldcheck; int i; unsigned short val; for (i=0; i oldcheck) check--; } check = ((check & 0x0000ffff) + (check >> 16)); check = ((check & 0x0000ffff) + (check >> 16)); return check << 16; } faim_export fu32_t aim_oft_checksum_file(char *filename) { FILE *fd; fu32_t checksum = 0xffff0000; if ((fd = fopen(filename, "rb"))) { int bytes; fu8_t buffer[1024]; while ((bytes = fread(buffer, 1, 1024, fd))) checksum = aim_oft_checksum_chunk(buffer, bytes, checksum); fclose(fd); } return checksum; } /** * Create a listening socket on a given port. * * XXX - Give the client author the responsibility of setting up a * listener, then we no longer have a libfaim problem with broken * solaris *innocent smile* -- jbm * * @param portnum The port number to bind to. * @return The file descriptor of the listening socket. */ static int listenestablish(fu16_t portnum) { #if HAVE_GETADDRINFO int listenfd; const int on = 1; struct addrinfo hints, *res, *ressave; char serv[5]; snprintf(serv, sizeof(serv), "%d", portnum); memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_flags = AI_PASSIVE; hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; if (getaddrinfo(NULL /* any IP */, serv, &hints, &res) != 0) { perror("getaddrinfo"); return -1; } ressave = res; do { listenfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (listenfd < 0) continue; setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); if (bind(listenfd, res->ai_addr, res->ai_addrlen) == 0) break; /* success */ close(listenfd); } while ( (res = res->ai_next) ); if (!res) return -1; freeaddrinfo(ressave); #else int listenfd; const int on = 1; struct sockaddr_in sockin; if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("socket"); return -1; } if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) != 0) { perror("setsockopt"); close(listenfd); return -1; } memset(&sockin, 0, sizeof(struct sockaddr_in)); sockin.sin_family = AF_INET; sockin.sin_port = htons(portnum); if (bind(listenfd, (struct sockaddr *)&sockin, sizeof(struct sockaddr_in)) != 0) { perror("bind"); close(listenfd); return -1; } #endif if (listen(listenfd, 4) != 0) { perror("listen"); close(listenfd); return -1; } fcntl(listenfd, F_SETFL, O_NONBLOCK); return listenfd; } /** * After establishing a listening socket, this is called to accept a connection. It * clones the conn used by the listener, and passes both of these to a signal handler. * The signal handler should close the listener conn and keep track of the new conn, * since this is what is used for file transfers and what not. * * @param sess The session. * @param cur The conn the incoming connection is on. * @return Return 0 if no errors, otherwise return the error number. */ faim_export int aim_handlerendconnect(aim_session_t *sess, aim_conn_t *cur) { int acceptfd = 0; struct sockaddr addr; socklen_t addrlen = sizeof(addr); int ret = 0; aim_conn_t *newconn; char ip[20]; int port; if ((acceptfd = accept(cur->fd, &addr, &addrlen)) == -1) return 0; /* not an error */ if (addr.sa_family != AF_INET) { /* just in case IPv6 really is happening */ close(acceptfd); aim_conn_close(cur); return -1; } strncpy(ip, inet_ntoa(((struct sockaddr_in *)&addr)->sin_addr), sizeof(ip)); port = ntohs(((struct sockaddr_in *)&addr)->sin_port); if (!(newconn = aim_cloneconn(sess, cur))) { close(acceptfd); aim_conn_close(cur); return -ENOMEM; } newconn->type = AIM_CONN_TYPE_RENDEZVOUS; newconn->fd = acceptfd; if (newconn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM) { aim_rxcallback_t userfunc; struct aim_odc_intdata *priv; priv = (struct aim_odc_intdata *)(newconn->internal = cur->internal); cur->internal = NULL; snprintf(priv->ip, sizeof(priv->ip), "%s:%u", ip, port); if ((userfunc = aim_callhandler(sess, newconn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIM_ESTABLISHED))) ret = userfunc(sess, NULL, newconn, cur); } else if (newconn->subtype == AIM_CONN_SUBTYPE_OFT_GETFILE) { } else if (newconn->subtype == AIM_CONN_SUBTYPE_OFT_SENDFILE) { aim_rxcallback_t userfunc; if ((userfunc = aim_callhandler(sess, newconn, AIM_CB_FAM_OFT, AIM_CB_OFT_ESTABLISHED))) ret = userfunc(sess, NULL, newconn, cur); } else { faimdprintf(sess, 1,"Got a connection on a listener that's not rendezvous. Closing connection.\n"); aim_conn_close(newconn); ret = -1; } return ret; } /** * Send client-to-client typing notification over an established direct connection. * * @param sess The session. * @param conn The already-connected ODC connection. * @param typing If 0x0002, sends a "typing" message, 0x0001 sends "typed," and * 0x0000 sends "stopped." * @return Return 0 if no errors, otherwise return the error number. */ faim_export int aim_odc_send_typing(aim_session_t *sess, aim_conn_t *conn, int typing) { struct aim_odc_intdata *intdata = (struct aim_odc_intdata *)conn->internal; aim_frame_t *fr; aim_bstream_t *hdrbs; fu8_t *hdr; int hdrlen = 0x44; if (!sess || !conn || (conn->type != AIM_CONN_TYPE_RENDEZVOUS)) return -EINVAL; if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x0001, 0))) return -ENOMEM; memcpy(fr->hdr.rend.magic, "ODC2", 4); fr->hdr.rend.hdrlen = hdrlen; if (!(hdr = calloc(1, hdrlen))) { aim_frame_destroy(fr); return -ENOMEM; } hdrbs = &(fr->data); aim_bstream_init(hdrbs, hdr, hdrlen); aimbs_put16(hdrbs, 0x0006); aimbs_put16(hdrbs, 0x0000); aimbs_putraw(hdrbs, intdata->cookie, 8); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put32(hdrbs, 0x00000000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); if (typing == 0x0002) aimbs_put16(hdrbs, 0x0002 | 0x0008); else if (typing == 0x0001) aimbs_put16(hdrbs, 0x0002 | 0x0004); else aimbs_put16(hdrbs, 0x0002); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_putraw(hdrbs, sess->sn, strlen(sess->sn)); aim_bstream_setpos(hdrbs, 52); /* bleeehh */ aimbs_put8(hdrbs, 0x00); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put8(hdrbs, 0x00); /* end of hdr */ aim_tx_enqueue(sess, fr); return 0; } /** * Send client-to-client IM over an established direct connection. * Call this just like you would aim_send_im, to send a directim. * * @param sess The session. * @param conn The already-connected ODC connection. * @param msg Null-terminated string to send. * @param len The length of the message to send, including binary data. * @param encoding 0 for ascii, 2 for Unicode, 3 for ISO 8859-1. * @param isawaymsg 0 if this is not an auto-response, 1 if it is. * @return Return 0 if no errors, otherwise return the error number. */ faim_export int aim_odc_send_im(aim_session_t *sess, aim_conn_t *conn, const char *msg, int len, int encoding, int isawaymsg) { aim_frame_t *fr; aim_bstream_t *hdrbs; struct aim_odc_intdata *intdata = (struct aim_odc_intdata *)conn->internal; int hdrlen = 0x44; fu8_t *hdr; if (!sess || !conn || (conn->type != AIM_CONN_TYPE_RENDEZVOUS) || !msg) return -EINVAL; if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x01, 0))) return -ENOMEM; memcpy(fr->hdr.rend.magic, "ODC2", 4); fr->hdr.rend.hdrlen = hdrlen; if (!(hdr = calloc(1, hdrlen + len))) { aim_frame_destroy(fr); return -ENOMEM; } hdrbs = &(fr->data); aim_bstream_init(hdrbs, hdr, hdrlen + len); aimbs_put16(hdrbs, 0x0006); aimbs_put16(hdrbs, 0x0000); aimbs_putraw(hdrbs, intdata->cookie, 8); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put32(hdrbs, len); aimbs_put16(hdrbs, encoding); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); /* flags - used for typing notification and to mark if this is an away message */ aimbs_put16(hdrbs, 0x0000 | isawaymsg); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_putraw(hdrbs, sess->sn, strlen(sess->sn)); aim_bstream_setpos(hdrbs, 52); /* bleeehh */ aimbs_put8(hdrbs, 0x00); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x0000); aimbs_put8(hdrbs, 0x00); /* end of hdr2 */ #if 0 /* XXX - this is how you send buddy icon info... */ aimbs_put16(hdrbs, 0x0008); aimbs_put16(hdrbs, 0x000c); aimbs_put16(hdrbs, 0x0000); aimbs_put16(hdrbs, 0x1466); aimbs_put16(hdrbs, 0x0001); aimbs_put16(hdrbs, 0x2e0f); aimbs_put16(hdrbs, 0x393e); aimbs_put16(hdrbs, 0xcac8); #endif aimbs_putraw(hdrbs, msg, len); aim_tx_enqueue(sess, fr); return 0; } /** * Get the screen name of the peer of a direct connection. * * @param conn The ODC connection. * @return The screen name of the dude, or NULL if there was an anomaly. */ faim_export const char *aim_odc_getsn(aim_conn_t *conn) { struct aim_odc_intdata *intdata; if (!conn || !conn->internal) return NULL; if ((conn->type != AIM_CONN_TYPE_RENDEZVOUS) || (conn->subtype != AIM_CONN_SUBTYPE_OFT_DIRECTIM)) return NULL; intdata = (struct aim_odc_intdata *)conn->internal; return intdata->sn; } /** * Find the conn of a direct connection with the given buddy. * * @param sess The session. * @param sn The screen name of the buddy whose direct connection you want to find. * @return The conn for the direct connection with the given buddy, or NULL if no * connection was found. */ faim_export aim_conn_t *aim_odc_getconn(aim_session_t *sess, const char *sn) { aim_conn_t *cur; struct aim_odc_intdata *intdata; if (!sess || !sn || !strlen(sn)) return NULL; for (cur = sess->connlist; cur; cur = cur->next) { if ((cur->type == AIM_CONN_TYPE_RENDEZVOUS) && (cur->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM)) { intdata = cur->internal; if (!aim_sncmp(intdata->sn, sn)) return cur; } } return NULL; } /** * For those times when we want to open up the direct connection channel ourselves. * * You'll want to set up some kind of watcher on this socket. * When the state changes, call aim_handlerendconnection with * the connection returned by this. aim_handlerendconnection * will accept the pending connection and stop listening. * * @param sess The session * @param sn The screen name to connect to. * @return The new connection. */ faim_export aim_conn_t *aim_odc_initiate(aim_session_t *sess, const char *sn) { aim_conn_t *newconn; aim_msgcookie_t *cookie; struct aim_odc_intdata *priv; int listenfd; fu16_t port = 4443; fu8_t localip[4]; fu8_t ck[8]; if (aim_util_getlocalip(localip) == -1) return NULL; if ((listenfd = listenestablish(port)) == -1) return NULL; aim_im_sendch2_odcrequest(sess, ck, sn, localip, port); cookie = (aim_msgcookie_t *)calloc(1, sizeof(aim_msgcookie_t)); memcpy(cookie->cookie, ck, 8); cookie->type = AIM_COOKIETYPE_OFTIM; /* this one is for the cookie */ priv = (struct aim_odc_intdata *)calloc(1, sizeof(struct aim_odc_intdata)); memcpy(priv->cookie, ck, 8); strncpy(priv->sn, sn, sizeof(priv->sn)); cookie->data = priv; aim_cachecookie(sess, cookie); /* XXX - switch to aim_cloneconn()? */ if (!(newconn = aim_newconn(sess, AIM_CONN_TYPE_LISTENER, NULL))) { close(listenfd); return NULL; } /* this one is for the conn */ priv = (struct aim_odc_intdata *)calloc(1, sizeof(struct aim_odc_intdata)); memcpy(priv->cookie, ck, 8); strncpy(priv->sn, sn, sizeof(priv->sn)); newconn->fd = listenfd; newconn->subtype = AIM_CONN_SUBTYPE_OFT_DIRECTIM; newconn->internal = priv; newconn->lastactivity = time(NULL); return newconn; } /** * Connect directly to the given buddy for directim. * * This is a wrapper for aim_newconn. * * If addr is NULL, the socket is not created, but the connection is * allocated and setup to connect. * * @param sess The Godly session. * @param sn The screen name we're connecting to. I hope it's a girl... * @param addr Address to connect to. * @return The new connection. */ faim_export aim_conn_t *aim_odc_connect(aim_session_t *sess, const char *sn, const char *addr, const fu8_t *cookie) { aim_conn_t *newconn; struct aim_odc_intdata *intdata; if (!sess || !sn) return NULL; if (!(intdata = calloc(1, sizeof(struct aim_odc_intdata)))) return NULL; memcpy(intdata->cookie, cookie, 8); strncpy(intdata->sn, sn, sizeof(intdata->sn)); if (addr) strncpy(intdata->ip, addr, sizeof(intdata->ip)); /* XXX - verify that non-blocking connects actually work */ if (!(newconn = aim_newconn(sess, AIM_CONN_TYPE_RENDEZVOUS, addr))) { free(intdata); return NULL; } newconn->internal = intdata; newconn->subtype = AIM_CONN_SUBTYPE_OFT_DIRECTIM; return newconn; } /** * Sometimes you just don't know with these kinds of people. * * @param sess The session. * @param conn The ODC connection of the incoming data. * @param frr The frame allocated for the incoming data. * @param bs It stands for "bologna sandwich." * @return Return 0 if no errors, otherwise return the error number. */ static int handlehdr_odc(aim_session_t *sess, aim_conn_t *conn, aim_frame_t *frr, aim_bstream_t *bs) { aim_frame_t fr; int ret = 0; aim_rxcallback_t userfunc; fu32_t payloadlength; fu16_t flags, encoding; char *snptr = NULL; fr.conn = conn; /* AAA - ugly */ aim_bstream_setpos(bs, 20); payloadlength = aimbs_get32(bs); aim_bstream_setpos(bs, 24); encoding = aimbs_get16(bs); aim_bstream_setpos(bs, 30); flags = aimbs_get16(bs); aim_bstream_setpos(bs, 36); /* XXX - create an aimbs_getnullstr function? */ snptr = aimbs_getstr(bs, 32); /* Next 32 bytes contain the sn, padded with null chars */ faimdprintf(sess, 2, "faim: OFT frame: handlehdr_odc: %04x / %04x / %s\n", payloadlength, flags, snptr); if (flags & 0x0008) { if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMTYPING))) ret = userfunc(sess, &fr, snptr, 2); } else if (flags & 0x0004) { if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMTYPING))) ret = userfunc(sess, &fr, snptr, 1); } else { if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMTYPING))) ret = userfunc(sess, &fr, snptr, 0); } if (payloadlength) { char *msg; int recvd = 0; int i, isawaymsg; isawaymsg = flags & 0x0001; if (!(msg = calloc(1, payloadlength+1))) { free(snptr); return -ENOMEM; } while (payloadlength - recvd) { if (payloadlength - recvd >= 1024) i = aim_recv(conn->fd, &msg[recvd], 1024); else i = aim_recv(conn->fd, &msg[recvd], payloadlength - recvd); if (i <= 0) { free(msg); free(snptr); return -1; } recvd = recvd + i; if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_IMAGETRANSFER))) ret = userfunc(sess, &fr, snptr, (double)recvd / payloadlength); } if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMINCOMING))) ret = userfunc(sess, &fr, snptr, msg, payloadlength, encoding, isawaymsg); free(msg); } free(snptr); return ret; } faim_export struct aim_oft_info *aim_oft_createinfo(aim_session_t *sess, const fu8_t *cookie, const char *sn, const char *ip, fu16_t port, fu32_t size, fu32_t modtime, char *filename) { struct aim_oft_info *new; if (!sess) return NULL; if (!(new = (struct aim_oft_info *)calloc(1, sizeof(struct aim_oft_info)))) return NULL; new->sess = sess; if (cookie) memcpy(new->cookie, cookie, 8); if (ip) new->clientip = strdup(ip); if (sn) new->sn = strdup(sn); new->port = port; new->fh.totfiles = 1; new->fh.filesleft = 1; new->fh.totparts = 1; new->fh.partsleft = 1; new->fh.totsize = size; new->fh.size = size; new->fh.modtime = modtime; new->fh.checksum = 0xffff0000; new->fh.rfrcsum = 0xffff0000; new->fh.rfcsum = 0xffff0000; new->fh.recvcsum = 0xffff0000; strncpy(new->fh.idstring, "OFT_Windows ICBMFT V1.1 32", 31); if (filename) strncpy(new->fh.name, filename, 63); new->next = sess->oft_info; sess->oft_info = new; return new; } /** * Remove the given oft_info struct from the oft_info linked list, and * then free its memory. * * @param sess The session. * @param oft_info The aim_oft_info struct that we're destroying. * @return Return 0 if no errors, otherwise return the error number. */ faim_export int aim_oft_destroyinfo(struct aim_oft_info *oft_info) { aim_session_t *sess; if (!oft_info || !(sess = oft_info->sess)) return -EINVAL; if (sess->oft_info && (sess->oft_info == oft_info)) { sess->oft_info = sess->oft_info->next; } else { struct aim_oft_info *cur; for (cur=sess->oft_info; (cur->next && (cur->next!=oft_info)); cur=cur->next); if (cur->next) cur->next = cur->next->next; } free(oft_info->sn); free(oft_info->proxyip); free(oft_info->clientip); free(oft_info->verifiedip); free(oft_info); return 0; } /** * Creates a listener socket so the other dude can connect to us. * * You'll want to set up some kind of watcher on this socket. * When the state changes, call aim_handlerendconnection with * the connection returned by this. aim_handlerendconnection * will accept the pending connection and stop listening. * * @param sess The session. * @param oft_info File transfer information associated with this * connection. * @return Return 0 if no errors, otherwise return the error number. */ faim_export int aim_sendfile_listen(aim_session_t *sess, struct aim_oft_info *oft_info) { int listenfd; if (!oft_info) return -EINVAL; if ((listenfd = listenestablish(oft_info->port)) == -1) return 1; if (!(oft_info->conn = aim_newconn(sess, AIM_CONN_TYPE_LISTENER, NULL))) { close(listenfd); return -ENOMEM; } oft_info->conn->fd = listenfd; oft_info->conn->subtype = AIM_CONN_SUBTYPE_OFT_SENDFILE; oft_info->conn->lastactivity = time(NULL); return 0; } /** * Extract an &aim_fileheader_t from the given buffer. * * @param bs The should be from an incoming rendezvous packet. * @return A pointer to new struct on success, or NULL on error. */ static struct aim_fileheader_t *aim_oft_getheader(aim_bstream_t *bs) { struct aim_fileheader_t *fh; if (!(fh = calloc(1, sizeof(struct aim_fileheader_t)))) return NULL; /* The bstream should be positioned after the hdrtype. */ aimbs_getrawbuf(bs, fh->bcookie, 8); fh->encrypt = aimbs_get16(bs); fh->compress = aimbs_get16(bs); fh->totfiles = aimbs_get16(bs); fh->filesleft = aimbs_get16(bs); fh->totparts = aimbs_get16(bs); fh->partsleft = aimbs_get16(bs); fh->totsize = aimbs_get32(bs); fh->size = aimbs_get32(bs); fh->modtime = aimbs_get32(bs); fh->checksum = aimbs_get32(bs); fh->rfrcsum = aimbs_get32(bs); fh->rfsize = aimbs_get32(bs); fh->cretime = aimbs_get32(bs); fh->rfcsum = aimbs_get32(bs); fh->nrecvd = aimbs_get32(bs); fh->recvcsum = aimbs_get32(bs); aimbs_getrawbuf(bs, fh->idstring, 32); fh->flags = aimbs_get8(bs); fh->lnameoffset = aimbs_get8(bs); fh->lsizeoffset = aimbs_get8(bs); aimbs_getrawbuf(bs, fh->dummy, 69); aimbs_getrawbuf(bs, fh->macfileinfo, 16); fh->nencode = aimbs_get16(bs); fh->nlanguage = aimbs_get16(bs); aimbs_getrawbuf(bs, fh->name, 64); /* XXX - filenames longer than 64B */ return fh; } /** * Fills a buffer with network-order fh data * * @param bs A bstream to fill -- automatically initialized * @param fh A struct aim_fileheader_t to get data from. * @return Return non-zero on error. */ static int aim_oft_buildheader(aim_bstream_t *bs, struct aim_fileheader_t *fh) { fu8_t *hdr; if (!bs || !fh) return -EINVAL; if (!(hdr = (unsigned char *)calloc(1, 0x100 - 8))) return -ENOMEM; aim_bstream_init(bs, hdr, 0x100 - 8); aimbs_putraw(bs, fh->bcookie, 8); aimbs_put16(bs, fh->encrypt); aimbs_put16(bs, fh->compress); aimbs_put16(bs, fh->totfiles); aimbs_put16(bs, fh->filesleft); aimbs_put16(bs, fh->totparts); aimbs_put16(bs, fh->partsleft); aimbs_put32(bs, fh->totsize); aimbs_put32(bs, fh->size); aimbs_put32(bs, fh->modtime); aimbs_put32(bs, fh->checksum); aimbs_put32(bs, fh->rfrcsum); aimbs_put32(bs, fh->rfsize); aimbs_put32(bs, fh->cretime); aimbs_put32(bs, fh->rfcsum); aimbs_put32(bs, fh->nrecvd); aimbs_put32(bs, fh->recvcsum); aimbs_putraw(bs, fh->idstring, 32); aimbs_put8(bs, fh->flags); aimbs_put8(bs, fh->lnameoffset); aimbs_put8(bs, fh->lsizeoffset); aimbs_putraw(bs, fh->dummy, 69); aimbs_putraw(bs, fh->macfileinfo, 16); aimbs_put16(bs, fh->nencode); aimbs_put16(bs, fh->nlanguage); aimbs_putraw(bs, fh->name, 64); /* XXX - filenames longer than 64B */ return 0; } /** * Create an OFT packet based on the given information, and send it on its merry way. * * @param sess The session. * @param type The subtype of the OFT packet we're sending. * @param oft_info The aim_oft_info struct with the connection and OFT * info we're sending. * @return Return 0 if no errors, otherwise return the error number. */ faim_export int aim_oft_sendheader(aim_session_t *sess, fu16_t type, struct aim_oft_info *oft_info) { aim_frame_t *fr; if (!sess || !oft_info || !oft_info->conn || (oft_info->conn->type != AIM_CONN_TYPE_RENDEZVOUS)) return -EINVAL; #if 0 /* * If you are receiving a file, the cookie should be null, if you are sending a * file, the cookie should be the same as the one used in the ICBM negotiation * SNACs. */ fh->lnameoffset = 0x1a; fh->lsizeoffset = 0x10; /* apparently 0 is ASCII, 2 is UCS-2 */ /* it is likely that 3 is ISO 8859-1 */ /* I think "nlanguage" might be the same thing as "subenc" in im.c */ fh->nencode = 0x0000; fh->nlanguage = 0x0000; #endif aim_oft_dirconvert_tostupid(oft_info->fh.name); if (!(fr = aim_tx_new(sess, oft_info->conn, AIM_FRAMETYPE_OFT, type, 0))) return -ENOMEM; if (aim_oft_buildheader(&fr->data, &oft_info->fh) == -1) { aim_frame_destroy(fr); return -ENOMEM; } memcpy(fr->hdr.rend.magic, "OFT2", 4); fr->hdr.rend.hdrlen = aim_bstream_curpos(&fr->data); aim_tx_enqueue(sess, fr); return 0; } /** * Handle incoming data on a rendezvous connection. This is analogous to the * consumesnac function in rxhandlers.c, and I really think this should probably * be in rxhandlers.c as well, but I haven't finished cleaning everything up yet. * * @param sess The session. * @param fr The frame allocated for the incoming data. * @return Return 0 if the packet was handled correctly, otherwise return the * error number. */ faim_internal int aim_rxdispatch_rendezvous(aim_session_t *sess, aim_frame_t *fr) { aim_conn_t *conn = fr->conn; int ret = 1; if (conn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM) { if (fr->hdr.rend.type == 0x0001) ret = handlehdr_odc(sess, conn, fr, &fr->data); else faimdprintf(sess, 0, "faim: ODC directim frame unknown, type is %04x\n", fr->hdr.rend.type); } else { aim_rxcallback_t userfunc; struct aim_fileheader_t *header = aim_oft_getheader(&fr->data); aim_oft_dirconvert_fromstupid(header->name); /* XXX - This should be client-side */ if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, fr->hdr.rend.type))) ret = userfunc(sess, fr, conn, header->bcookie, header); free(header); } if (ret == -1) aim_conn_close(conn); return ret; }