/* * $Id: uac_fifo.c,v 1.12 2004/11/09 15:15:12 andrei Exp $ * * Copyright (C) 2001-2003 FhG Fokus * * This file is part of ser, a free SIP server. * * ser 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 * * For a license to use the ser software under conditions * other than those described here, or to purchase support for this * software, please contact iptel.org by e-mail at the following addresses: * info@iptel.org * * ser 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * History: * -------- * 2003-12-03 : fifo_callback() updated for changes in tm callbacks (bogdan) * 2004-02-11: fix: TM callback writes to fifo changed to non-blocking (jiri) */ #include #include "../../mem/shm_mem.h" #include "../../mem/mem.h" #include "../../dprint.h" #include "../../fifo_server.h" #include "../../str.h" #include "../../parser/msg_parser.h" #include "../../parser/parse_from.h" #include "../../parser/parse_uri.h" #include "../../ip_addr.h" #include "config.h" #include "ut.h" #include "uac.h" #include "dlg.h" #include "callid.h" #include "h_table.h" #include "uac_fifo.h" /* * Callback data structure */ struct cb_data { dlg_t* dialog; char filename[1]; }; struct str_list { str s; struct str_list *next; }; #define skip_hf(_hf) ( \ ((_hf)->type == HDR_FROM) || \ ((_hf)->type == HDR_TO) || \ ((_hf)->type == HDR_CALLID) || \ ((_hf)->type == HDR_CSEQ) \ ) /* * Report an error to syslog and FIFO output file */ static inline void fifo_uac_error(char *reply_fifo, int code, char *msg) { LOG(L_ERR, "ERROR: fifo_uac_error: %s\n", msg ); fifo_reply(reply_fifo, "%d fifo_uac_error: %s", code, msg); } /* * Get the Request URI from the FIFO stream and parse it */ static inline int fifo_get_ruri(FILE* stream, char* response_file, str* ruri, struct sip_uri* puri) { static char ruri_buf[MAX_URI_SIZE]; if (!read_line(ruri_buf, MAX_URI_SIZE, stream, &ruri->len) || !ruri->len) { fifo_uac_error(response_file, 400, "ruri expected"); return -1; } if (parse_uri(ruri_buf, ruri->len, puri) < 0 ) { fifo_uac_error(response_file, 400, "ruri invalid\n"); return -2; } ruri->s = ruri_buf; DBG("DEBUG: fifo_get_ruri: '%.*s'\n", ruri->len, ruri->s); return 0; } /* * Get and parse next hop URI */ static inline int fifo_get_nexthop(FILE* stream, char* response_file, str* nexthop, struct sip_uri* pnexthop) { static char nexthop_buf[MAX_URI_SIZE]; if (!read_line(nexthop_buf, MAX_URI_SIZE, stream, &nexthop->len) || !nexthop->len) { fifo_uac_error(response_file, 400, "next hop address expected\n"); return -1; } if (nexthop->len == 1 && nexthop_buf[0] == '.' ) { DBG("DEBUG: fifo_get_nexthop: next hop empty\n"); nexthop->s = 0; nexthop->len = 0; } else if (parse_uri(nexthop_buf, nexthop->len, pnexthop) < 0 ) { fifo_uac_error(response_file, 400, "next hop uri invalid\n"); return -2; } else { nexthop->s = nexthop_buf; DBG("DEBUG: fifo_get_nexthop: hop: '%.*s'\n", nexthop->len, nexthop->s); } return 0; } /* * Get method name from FIFO stream */ static inline int fifo_get_method(FILE* stream, char* response_file, str* method) { static char method_buf[MAX_METHOD]; if (!read_line(method_buf, MAX_METHOD, stream, &method->len) || !method->len) { /* line breaking must have failed -- consume the rest and proceed to a new request */ fifo_uac_error(response_file, 400, "method expected"); return -1; } method->s = method_buf; DBG("fifo_get_method: method: '%.*s'\n", method->len, method->s); return 0; } /* * Get message body from FIFO stream */ static inline int fifo_get_body(FILE* stream, char* response_file, str* body) { static char body_buf[MAX_BODY]; if (!read_body(body_buf, MAX_BODY, stream, &body->len)) { fifo_uac_error(response_file, 400, "body expected"); return -1; } body->s = body_buf; DBG("fifo_get_body: body: %.*s\n", body->len, body->s); return 0; } /* * Get message headers from FIFO stream */ static inline int fifo_get_headers(FILE* stream, char* response_file, str* headers) { static char headers_buf[MAX_HEADER]; /* now read and parse header fields */ if (!read_line_set(headers_buf, MAX_HEADER, stream, &headers->len) || !headers->len) { fifo_uac_error(response_file, 400, "HFs expected"); return -1; } headers->s = headers_buf; DBG("fifo_get_headers: headers: %.*s\n", headers->len, headers->s); return 0; } /* * Create shm_copy of filename */ static inline int fifo_cbp(char** shm_file, char* response_file) { int fn_len; if (response_file) { fn_len = strlen(response_file) + 1; *shm_file = shm_malloc(fn_len); if (!*shm_file) { fifo_uac_error(response_file, 500, "no shmem"); return -1; } memcpy(*shm_file, response_file, fn_len); } else { *shm_file = 0; } return 0; } static inline struct str_list *new_str(char *s, int len, struct str_list **last, int *total) { struct str_list *new; new=pkg_malloc(sizeof(struct str_list)); if (!new) { LOG(L_ERR, "ERROR: new_str: not enough mem\n"); return 0; } new->s.s=s; new->s.len=len; new->next=0; (*last)->next=new; *last=new; *total+=len; return new; } static char *get_hfblock(str *uri, struct hdr_field *hf, int *l, int proto) { struct str_list sl, *last, *new, *i, *foo; int hf_avail, frag_len, total_len; char *begin, *needle, *dst, *ret, *d; str *sock_name, *portname; union sockaddr_union to_su; struct socket_info* send_sock; ret=0; /* pessimist: assume failure */ total_len=0; last=&sl; last->next=0; portname=sock_name=0; for (; hf; hf=hf->next) { if (skip_hf(hf)) continue; begin=needle=hf->name.s; hf_avail=hf->len; /* substitution loop */ while(hf_avail) { d=memchr(needle, SUBST_CHAR, hf_avail); if (!d || d+1>=needle+hf_avail) { /* nothing to substitute */ new=new_str(begin, hf_avail, &last, &total_len); if (!new) goto error; break; } else { frag_len=d-begin; d++; /* d not at the second substitution char */ switch(*d) { case SUBST_CHAR: /* double SUBST_CHAR: IP */ /* string before substitute */ new=new_str(begin, frag_len, &last, &total_len); if (!new) goto error; /* substitute */ if (!sock_name) { send_sock=uri2sock(0, uri, &to_su, proto ); if (!send_sock) { LOG(L_ERR, "ERROR: get_hfblock: send_sock failed\n"); goto error; } sock_name=&send_sock->address_str; portname=&send_sock->port_no_str; } new=new_str(sock_name->s, sock_name->len, &last, &total_len ); if (!new) goto error; /* inefficient - FIXME --andrei*/ new=new_str(":", 1, &last, &total_len); if (!new) goto error; new=new_str(portname->s, portname->len, &last, &total_len ); if (!new) goto error; /* keep going ... */ begin=needle=d+1;hf_avail-=frag_len+2; continue; default: /* no valid substitution char -- keep going */ hf_avail-=frag_len+1; needle=d; } } /* possible substitute */ } /* substitution loop */ /* proceed to next header */ /* new=new_str(CRLF, CRLF_LEN, &last, &total_len ); if (!new) goto error; */ DBG("DEBUG: get_hfblock: one more hf processed\n"); } /* header loop */ /* construct a single header block now */ ret=pkg_malloc(total_len); if (!ret) { LOG(L_ERR, "ERROR: get_hfblock no pkg mem for hf block\n"); goto error; } i=sl.next; dst=ret; while(i) { foo=i; i=i->next; memcpy(dst, foo->s.s, foo->s.len); dst+=foo->s.len; pkg_free(foo); } *l=total_len; return ret; error: i=sl.next; while(i) { foo=i; i=i->next; pkg_free(foo); } *l=0; return 0; } /* syntax: :t_uac:[file] EOL method EOL r-uri EOL dst EOL // ("." if no outbound server used) // must be used with dialogs/lr + // From and To must be present at least; // dialog-apps must include tag in From // (an ephemeral is appended otherwise) // and supply CSeq/CallId .[EOL] [body] .EOL there is also the possibility to have server placed its hostname:portnumber in header fields -- just put double exclamation mark in any of the optional header fields (i.e., any but From/To/CallID,CSeq), they will be substituted hn:pn Example: sc fifo t_uac_dlg MESSAGE sip:joe@192.168.2.1 \ . \ # no outbound proxy 'From:sender@iptel.org;tagd=123' \ # no to-tag -> ephemeral 'To:sender@iptel.org' \ 'Foo: sip:user@!! ' \ # expansion here 'CSEQ: 11 MESSAGE ' \ . \ # EoH . # empty body --- U 192.168.2.16:5060 -> 192.168.2.1:5060 MESSAGE sip:joe@192.168.2.1 SIP/2.0.. Via: SIP/2.0/UDP 192.168.2.16;branch=z9hG4bK760c.922ea6a1.0.. To: sender@iptel.org.. From: sender@iptel.org;tagd=123;tag=5405e669bc2980663aed2624dc31396f-fa77.. CSeq: 11 MESSAGE.. Call-ID: e863bf56-22255@192.168.2.16.. Content-Length: 0.. User-Agent: Sip EXpress router (0.8.11pre4-tcp1-locking (i386/linux)).. Foo: sip:user@192.168.2.16:5060.. .. */ /* * Make sure that the FIFO user created the message * correctly */ static inline int fifo_check_msg(struct sip_msg* msg, str* method, char* resp, str* body, int* fromtag, int *cseq_is, int* cseq, str* callid) { struct to_body* parsed_from; struct cseq_body *parsed_cseq; int i; char c; if (body->len && !msg->content_type) { fifo_uac_error(resp, 400, "Content-Type missing"); return -1; } if (body->len && msg->content_length) { fifo_uac_error(resp, 400, "Content-Length disallowed"); return -2; } if (!msg->to) { fifo_uac_error(resp, 400, "To missing"); return -3; } if (!msg->from) { fifo_uac_error(resp, 400, "From missing"); return -4; } /* we also need to know if there is from-tag and add it otherwise */ if (parse_from_header(msg) < 0) { fifo_uac_error(resp, 400, "Error in From"); return -5; } parsed_from = (struct to_body*)msg->from->parsed; *fromtag = parsed_from->tag_value.s && parsed_from->tag_value.len; *cseq = 0; if (msg->cseq && (parsed_cseq = get_cseq(msg))) { *cseq_is = 1; for (i = 0; i < parsed_cseq->number.len; i++) { c = parsed_cseq->number.s[i]; if (c >= '0' && c <= '9' ) *cseq = (*cseq) * 10 + c - '0'; else { DBG("found non-numerical in CSeq: <%i>='%c'\n",(unsigned int)c,c); fifo_uac_error(resp, 400, "non-numerical CSeq"); return -6; } } if (parsed_cseq->method.len != method->len || memcmp(parsed_cseq->method.s, method->s, method->len) !=0 ) { fifo_uac_error(resp, 400, "CSeq method mismatch"); return -7; } } else { *cseq_is = 0; } if (msg->callid) { callid->s = msg->callid->body.s; callid->len = msg->callid->body.len; } else { callid->s = 0; callid->len = 0; } return 0; } #define FIFO_ROUTE_PREFIX "Route: " #define FIFO_ROUTE_SEPARATOR ", " static inline void print_routes(FILE* out, dlg_t* _d) { rr_t* ptr; ptr = _d->hooks.first_route; if (ptr) { fprintf(out, FIFO_ROUTE_PREFIX); } else { fprintf(out, ".\n"); return; } while(ptr) { fprintf(out, "%.*s", ptr->len, ptr->nameaddr.name.s); ptr = ptr->next; if (ptr) { fprintf(out, FIFO_ROUTE_SEPARATOR); } } if (_d->hooks.last_route) { fprintf(out, FIFO_ROUTE_SEPARATOR "<"); fprintf(out, "%.*s", _d->hooks.last_route->len, _d->hooks.last_route->s); fprintf(out, ">"); } if (_d->hooks.first_route) { fprintf(out, CRLF); } } static inline int print_uris(FILE* out, struct sip_msg* reply) { dlg_t* dlg; dlg = (dlg_t*)shm_malloc(sizeof(dlg_t)); if (!dlg) { LOG(L_ERR, "print_uris(): No memory left\n"); return -1; } memset(dlg, 0, sizeof(dlg_t)); if (dlg_response_uac(dlg, reply) < 0) { LOG(L_ERR, "print_uris(): Error while creating dialog structure\n"); free_dlg(dlg); return -2; } if (dlg->state != DLG_CONFIRMED) { fprintf(out, ".\n.\n.\n"); free_dlg(dlg); return 0; } if (dlg->hooks.request_uri->s) { fprintf(out, "%.*s\n", dlg->hooks.request_uri->len, dlg->hooks.request_uri->s); } else { fprintf(out, ".\n"); } if (dlg->hooks.next_hop->s) { fprintf(out, "%.*s\n", dlg->hooks.next_hop->len, dlg->hooks.next_hop->s); } else { fprintf(out, ".\n"); } print_routes(out, dlg); free_dlg(dlg); return 0; } static void fifo_callback( struct cell *t, int type, struct tmcb_params *ps ) { char *filename; FILE* f; str text; DBG("!!!!! ref_counter: %d\n", t->ref_count); DBG("DEBUG: fifo UAC completed with status %d\n", ps->code); if (!*ps->param) { LOG(L_INFO, "INFO: fifo UAC completed with status %d\n", ps->code); return; } filename=(char *)(*ps->param); if (ps->rpl==FAKED_REPLY) { get_reply_status( &text, ps->rpl, ps->code); if (text.s==0) { LOG(L_ERR, "ERROR: fifo_callback: get_reply_status failed\n"); fifo_reply( filename, "500 fifo_callback: get_reply_status failed\n"); goto done; } fifo_reply(filename, "%.*s\n", text.len, text.s ); pkg_free(text.s); } else { text.s = ps->rpl->first_line.u.reply.reason.s; text.len = ps->rpl->first_line.u.reply.reason.len; f = open_reply_pipe(filename); if (!f) return; fprintf(f, "%d %.*s\n", ps->rpl->first_line.u.reply.statuscode, text.len, text.s); print_uris(f, ps->rpl); fprintf(f, "%s\n", ps->rpl->headers->name.s); fclose(f); } DBG("DEBUG: fifo_callback successfully completed\n"); done: shm_free(filename); } int fifo_uac(FILE *stream, char *response_file) { str method, ruri, nexthop, headers, body, hfb, callid; struct sip_uri puri, pnexthop; struct sip_msg faked_msg; int ret, sip_error, err_ret; int fromtag, cseq_is, cseq; struct cb_data; char err_buf[MAX_REASON_LEN]; char* shm_file; dlg_t dlg; if (fifo_get_method(stream, response_file, &method) < 0) return 1; if (fifo_get_ruri(stream, response_file, &ruri, &puri) < 0) return 1; if (fifo_get_nexthop(stream, response_file, &nexthop, &pnexthop) < 0) return 1; if (fifo_get_headers(stream, response_file, &headers) < 0) return 1; /* use SIP parser to look at what is in the FIFO request */ memset(&faked_msg, 0, sizeof(struct sip_msg)); faked_msg.len = headers.len; faked_msg.buf = faked_msg.unparsed = headers.s; if (parse_headers(&faked_msg, HDR_EOH, 0) == -1 ) { DBG("DEBUG: fifo_uac: parse_headers failed\n"); fifo_uac_error(response_file, 400, "HFs unparseable"); goto error; } DBG("DEBUG: fifo_uac: parse_headers succeeded\n"); if (fifo_get_body(stream, response_file, &body) < 0) goto error; /* at this moment, we collected all the things we got, let's * verify user has not forgotten something */ if (fifo_check_msg(&faked_msg, &method, response_file, &body, &fromtag, &cseq_is, &cseq, &callid) < 0) goto error; hfb.s = get_hfblock(nexthop.len ? &nexthop : &ruri, faked_msg.headers, &hfb.len, PROTO_UDP); if (!hfb.s) { fifo_uac_error(response_file, 500, "no mem for hf block"); goto error; } DBG("DEBUG: fifo_uac: EoL -- proceeding to transaction creation\n"); memset(&dlg, 0, sizeof(dlg_t)); /* Fill in Call-ID, use given Call-ID if * present and generate it if not present */ if (callid.s && callid.len) dlg.id.call_id = callid; else generate_callid(&dlg.id.call_id); /* We will not fill in dlg->id.rem_tag because * if present it will be printed within To HF */ /* Generate fromtag if not present */ if (!fromtag) { generate_fromtag(&dlg.id.loc_tag, &dlg.id.call_id); } /* Fill in CSeq */ if (cseq_is) dlg.loc_seq.value = cseq; else dlg.loc_seq.value = DEFAULT_CSEQ; dlg.loc_seq.is_set = 1; dlg.loc_uri = faked_msg.from->body; dlg.rem_uri = faked_msg.to->body; dlg.hooks.request_uri = &ruri; dlg.hooks.next_hop = (nexthop.len ? &nexthop : &ruri); #ifdef XL_DEBUG print_dlg(stderr, &dlg); #endif /* we got it all, initiate transaction now! */ if (fifo_cbp(&shm_file, response_file) < 0) goto error01; ret = t_uac(&method, &hfb, &body, &dlg, fifo_callback, shm_file); if (ret <= 0) { err_ret = err2reason_phrase(ret, &sip_error, err_buf, sizeof(err_buf), "FIFO/UAC") ; if (err_ret > 0 ) { fifo_uac_error(response_file, sip_error, err_buf); } else { fifo_uac_error(response_file, 500, "FIFO/UAC error"); } } error01: pkg_free(hfb.s); error: /* free_sip_msg(&faked_msg); */ if (faked_msg.headers) free_hdr_field_lst(faked_msg.headers); return 1; }