sdp_util.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/un.h>
#include <sys/poll.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "../../timer.h"
#include "../../dprint.h"
#include "../../mem/mem.h"
#include "../../str.h"
#include "../../trim.h"
#include "../../parser/msg_parser.h"
#include "../../parser/parser_f.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_uri.h"
#include "../../parser/contact/parse_contact.h"
#include "../../data_lump.h"
#include "sdp_util.h"
#include "mod.h"
#include "nat_helper.h"
#include "sip.h"

Go to the source code of this file.

Functions
int	check_content_type (struct sip_msg *msg)
int	extract_body (struct sip_msg *msg, str *body)
static int	isnulladdr (str *sx, int pf)
static int	extract_mediaport (str *body, str *mediaport)
static int	extract_mediaip (str *body, str *mediaip, int *pf)
static int	alter_mediaip (struct sip_msg *msg, str *body, str *oldip, int oldpf, str *newip, int newpf, int preserve)
static int	alter_mediaport (struct sip_msg *msg, str *body, str *oldport, str *newport, int preserve)
static char *	find_sdp_line (char *p, char *plimit, char linechar)
static char *	find_next_sdp_line (char *p, char *plimit, char linechar, char *defptr)
static int	rfc1918address (str *address)
static int	get_to_tag (struct sip_msg *_m, str *_tag)
static int	get_from_tag (struct sip_msg *_m, str *_tag)
static int	get_callid (struct sip_msg *_m, str *_cid)
static char *	gencookie ()
static char *	send_rtpp_command (struct rtpp_node *node, struct iovec *v, int vcnt)
int	rtpp_test (struct rtpp_node *node, int isdisabled, int force)
static struct rtpp_node *	select_rtpp_node (str callid, int do_test, int node_idx)
static int	force_rtp_proxy2_f (struct sip_msg *msg, char *str1, char *str2, int had_sdp_in_invite)
static int	unforce_rtp_proxy_f (struct sip_msg *msg, int node_idx)
int	rtpproxy_init ()
int	rtpproxy_child_init (int rank)
int	P_SDP_manipulate (struct sip_msg *msg, char *str1, char *str2)
Variables
int	pcscf_nat_enable
	whether to enable NAT
rtpp_head	rtpp_list
	RTPProxy list.
int	rtpp_node_count
	RTPProxy list count.
char *	rtpproxy_sock
int	rtpproxy_enable
	if the RTPProxy is enabled
int	rtpproxy_disable_tout
	disabling timeout for the RTPProxy
int	rtpproxy_retr
	Retry count.
int	rtpproxy_tout
	Timeout.
unsigned int	myseqn
static str	sup_ptypes []
network_t	nets_1918 []

---

Function Documentation

int check_content_type

(

struct sip_msg *

msg

)

Definition at line 50 of file sdp_util.c.

References advance, M_NAME, one_of_16, one_of_8, and READ.

Referenced by extract_body(), and P_SDP_manipulate().

{
    static unsigned int appl[16] = {
        0x6c707061/*appl*/,0x6c707041/*Appl*/,0x6c705061/*aPpl*/,
        0x6c705041/*APpl*/,0x6c507061/*apPl*/,0x6c507041/*ApPl*/,
        0x6c505061/*aPPl*/,0x6c505041/*APPl*/,0x4c707061/*appL*/,
        0x4c707041/*AppL*/,0x4c705061/*aPpL*/,0x4c705041/*APpL*/,
        0x4c507061/*apPL*/,0x4c507041/*ApPL*/,0x4c505061/*aPPL*/,
        0x4c505041/*APPL*/};
    static unsigned int icat[16] = {
        0x74616369/*icat*/,0x74616349/*Icat*/,0x74614369/*iCat*/,
        0x74614349/*ICat*/,0x74416369/*icAt*/,0x74416349/*IcAt*/,
        0x74414369/*iCAt*/,0x74414349/*ICAt*/,0x54616369/*icaT*/,
        0x54616349/*IcaT*/,0x54614369/*iCaT*/,0x54614349/*ICaT*/,
        0x54416369/*icAT*/,0x54416349/*IcAT*/,0x54414369/*iCAT*/,
        0x54414349/*ICAT*/};
    static unsigned int ion_[8] = {
        0x006e6f69/*ion_*/,0x006e6f49/*Ion_*/,0x006e4f69/*iOn_*/,
        0x006e4f49/*IOn_*/,0x004e6f69/*ioN_*/,0x004e6f49/*IoN_*/,
        0x004e4f69/*iON_*/,0x004e4f49/*ION_*/};
    static unsigned int sdp_[8] = {
        0x00706473/*sdp_*/,0x00706453/*Sdp_*/,0x00704473/*sDp_*/,
        0x00704453/*SDp_*/,0x00506473/*sdP_*/,0x00506453/*SdP_*/,
        0x00504473/*sDP_*/,0x00504453/*SDP_*/};
    str           str_type;
    unsigned int  x;
    char          *p;

    if (!msg->content_type){
        if (parse_headers(msg, HDR_CONTENTTYPE_F, 0)<0){
            LOG(L_ERR,"ERR:"M_NAME":check_content_type: error parsing headers\n");
            return 1;   
        }
    }
    if (!msg->content_type)
    {
        LOG(L_WARN,"WARNING: check_content_type: Content-TYPE header absent!"
            "let's assume the content is text/plain ;-)\n");
        return 1;
    }

    trim_len(str_type.len,str_type.s,msg->content_type->body);
    p = str_type.s;
    advance(p,4,str_type,error_1);
    x = READ(p-4);
    if (!one_of_16(x,appl))
        goto other;
    advance(p,4,str_type,error_1);
    x = READ(p-4);
    if (!one_of_16(x,icat))
        goto other;
    advance(p,3,str_type,error_1);
    x = READ(p-3) & 0x00ffffff;
    if (!one_of_8(x,ion_))
        goto other;

    /* skip spaces and tabs if any */
    while (*p==' ' || *p=='\t')
        advance(p,1,str_type,error_1);
    if (*p!='/')
    {
        LOG(L_ERR, "ERROR:check_content_type: parse error:"
            "no / found after primary type\n");
        goto error;
    }
    advance(p,1,str_type,error_1);
    while ((*p==' ' || *p=='\t') && p+1<str_type.s+str_type.len)
        advance(p,1,str_type,error_1);

    advance(p,3,str_type,error_1);
    x = READ(p-3) & 0x00ffffff;
    if (!one_of_8(x,sdp_))
        goto other;

    if (*p==';'||*p==' '||*p=='\t'||*p=='\n'||*p=='\r'||*p==0) {
        DBG("DEBUG:check_content_type: type <%.*s> found valid\n",
            (int)(p-str_type.s), str_type.s);
        return 1;
    } else {
        LOG(L_ERR,"ERROR:check_content_type: bad end for type!\n");
        return -1;
    }

error_1:
    LOG(L_ERR,"ERROR:check_content_type: parse error: body ended :-(!\n");
error:
    return -1;
other:
    LOG(L_ERR,"ERROR:check_content_type: invalid type for a message\n");
    return -1;
}

int extract_body	(	struct sip_msg *	msg,
		str *	body
	)

Definition at line 142 of file sdp_util.c.

References check_content_type().

Referenced by force_rtp_proxy2_f(), and P_SDP_manipulate().

{
    
    body->s = get_body(msg);
    if (body->s==0) {
        LOG(L_ERR, "ERROR: extract_body: failed to get the message body\n");
        goto error;
    }
    body->len = msg->len -(int)(body->s-msg->buf);
    if (body->len==0) {
        LOG(L_ERR, "ERROR: extract_body: message body has length zero\n");
        goto error;
    }
    
    /* no need for parse_headers(msg, EOH), get_body will 
     * parse everything */
    /*is the content type correct?*/
    if (check_content_type(msg)==-1)
    {
        LOG(L_ERR,"ERROR: extract_body: content type mismatching\n");
        goto error;
    }
    
    /*DBG("DEBUG:extract_body:=|%.*s|\n",body->len,body->s);*/

    return 1;
error:
    return -1;
}

static int isnulladdr	(	str *	sx,
		int	pf
	)			[static]

Definition at line 174 of file sdp_util.c.

Referenced by alter_mediaip(), and force_rtp_proxy2_f().

{
    char *cp;

    if (pf == AF_INET6) {
        for(cp = sx->s; cp < sx->s + sx->len; cp++)
            if (*cp != '0' && *cp != ':')
                return 0;
        return 1;
    }
    return (sx->len == 7 && memcmp("0.0.0.0", sx->s, 7) == 0);
}

static int extract_mediaport	(	str *	body,
		str *	mediaport
	)			[static]

Definition at line 187 of file sdp_util.c.

References NULL, ser_memmem(), and sup_ptypes.

Referenced by force_rtp_proxy2_f().

{
    char *cp, *cp1;
    int len, i;
    str ptype;

    cp1 = NULL;
    for (cp = body->s; (len = body->s + body->len - cp) > 0;) {
        cp1 = ser_memmem(cp, "m=", len, 2);
        if (cp1 == NULL || cp1[-1] == '\n' || cp1[-1] == '\r')
            break;
        cp = cp1 + 2;
    }
    if (cp1 == NULL) {
        LOG(L_ERR, "ERROR: extract_mediaport: no `m=' in SDP\n");
        return -1;
    }
    mediaport->s = cp1 + 2; /* skip `m=' */
    mediaport->len = eat_line(mediaport->s, body->s + body->len -
      mediaport->s) - mediaport->s;
    trim_len(mediaport->len, mediaport->s, *mediaport);

    /* Skip media supertype and spaces after it */
    cp = eat_token_end(mediaport->s, mediaport->s + mediaport->len);
    mediaport->len -= cp - mediaport->s;
    if (mediaport->len <= 0 || cp == mediaport->s) {
        LOG(L_ERR, "ERROR: extract_mediaport: no port in `m='\n");
        return -1;
    }
    mediaport->s = cp;
    cp = eat_space_end(mediaport->s, mediaport->s + mediaport->len);
    mediaport->len -= cp - mediaport->s;
    if (mediaport->len <= 0 || cp == mediaport->s) {
        LOG(L_ERR, "ERROR: extract_mediaport: no port in `m='\n");
        return -1;
    }
    /* Extract port */
    mediaport->s = cp;
    cp = eat_token_end(mediaport->s, mediaport->s + mediaport->len);
    ptype.len = mediaport->len - (cp - mediaport->s);
    if (ptype.len <= 0 || cp == mediaport->s) {
        LOG(L_ERR, "ERROR: extract_mediaport: no port in `m='\n");
        return -1;
    }
    ptype.s = cp;
    mediaport->len = cp - mediaport->s;
    /* Skip spaces after port */
    cp = eat_space_end(ptype.s, ptype.s + ptype.len);
    ptype.len -= cp - ptype.s;
    if (ptype.len <= 0 || cp == ptype.s) {
        LOG(L_ERR, "ERROR: extract_mediaport: no protocol type in `m='\n");
        return -1;
    }
    /* Extract protocol type */
    ptype.s = cp;
    cp = eat_token_end(ptype.s, ptype.s + ptype.len);
    if (cp == ptype.s) {
        LOG(L_ERR, "ERROR: extract_mediaport: no protocol type in `m='\n");
        return -1;
    }
    ptype.len = cp - ptype.s;

    for (i = 0; sup_ptypes[i].s != NULL; i++)
        if (ptype.len == sup_ptypes[i].len &&
            strncasecmp(ptype.s, sup_ptypes[i].s, ptype.len) == 0)
            return 0;
    /* Unproxyable protocol type. Generally it isn't error. */
    return -1;
}

static int extract_mediaip	(	str *	body,
		str *	mediaip,
		int *	pf
	)			[static]

Definition at line 258 of file sdp_util.c.

References NULL, and ser_memmem().

Referenced by force_rtp_proxy2_f().

{
    char *cp, *cp1;
    int len, nextisip;

    cp1 = NULL;
    for (cp = body->s; (len = body->s + body->len - cp) > 0;) {
        cp1 = ser_memmem(cp, "c=", len, 2);
        if (cp1 == NULL || cp1[-1] == '\n' || cp1[-1] == '\r')
            break;
        cp = cp1 + 2;
    }
    if (cp1 == NULL) {
        LOG(L_ERR, "ERROR: extract_mediaip: no `c=' in SDP\n");
        return -1;
    }
    mediaip->s = cp1 + 2;
    mediaip->len = eat_line(mediaip->s, body->s + body->len - mediaip->s) - mediaip->s;
    trim_len(mediaip->len, mediaip->s, *mediaip);

    nextisip = 0;
    for (cp = mediaip->s; cp < mediaip->s + mediaip->len;) {
        len = eat_token_end(cp, mediaip->s + mediaip->len) - cp;
        if (nextisip == 1) {
            mediaip->s = cp;
            mediaip->len = len;
            nextisip++;
            break;
        }
        if (len == 3 && memcmp(cp, "IP", 2) == 0) {
            switch (cp[2]) {
            case '4':
                nextisip = 1;
                *pf = AF_INET;
                break;

            case '6':
                nextisip = 1;
                *pf = AF_INET6;
                break;

            default:
                break;
            }
        }
        cp = eat_space_end(cp + len, mediaip->s + mediaip->len);
    }
    if (nextisip != 2 || mediaip->len == 0) {
        LOG(L_ERR, "ERROR: extract_mediaip: "
            "no `IP[4|6]' in `c=' field\n");
        return -1;
    }
    return 1;
}

static int alter_mediaip	(	struct sip_msg *	msg,
		str *	body,
		str *	oldip,
		int	oldpf,
		str *	newip,
		int	newpf,
		int	preserve
	)			[static]

Definition at line 334 of file sdp_util.c.

References AOLDMEDIP, AOLDMEDIP6, AOLDMEDIP6_LEN, AOLDMEDIP_LEN, isnulladdr(), and NULL.

Referenced by force_rtp_proxy2_f().

{
    char *buf;
    int offset;
    struct lump* anchor;
    str omip, nip, oip;

    /* check that updating mediaip is really necessary */
    if (oldpf == newpf && isnulladdr(oldip, oldpf))
        return 0;
    if (newip->len == oldip->len && memcmp(newip->s, oldip->s, newip->len) == 0)
        return 0;

    /*
     * Since rewriting the same info twice will mess SDP up,
     * apply simple anti foot shooting measure - put flag on
     * messages that have been altered and check it when
     * another request comes.
     */
#if 0
    /* disabled:
     *  - alter_mediaip is called twice if 2 c= lines are present
     *    in the sdp (and we want to allow it)
     *  - the message flags are propagated in the on_reply_route
     *  => if we set the flags for the request they will be seen for the
     *    reply too, but we don't want that
     *  --andrei
     */
    if (msg->msg_flags & FL_SDP_IP_AFS) {
        LOG(L_ERR, "ERROR: alter_mediaip: you can't rewrite the same "
          "SDP twice, check your config!\n");
        return -1;
    }
#endif

    if (preserve != 0) {
        anchor = anchor_lump(msg, body->s + body->len - msg->buf  , 0, 0);
        if (anchor == NULL) 
        {
            LOG(L_ERR, "ERROR: alter_mediaip: anchor_lump failed\n");
            return -1;
        }
        if (oldpf == AF_INET6) 
        {
            omip.s = AOLDMEDIP6 ;
            omip.len = AOLDMEDIP6_LEN;
        } else {
            omip.s = AOLDMEDIP;
            omip.len = AOLDMEDIP_LEN;
        }
        buf = pkg_malloc(omip.len + oldip->len + CRLF_LEN);
        if (buf == NULL) 
        {
            LOG(L_ERR, "ERROR: alter_mediaip: out of memory\n");
            return -1;
        }
        memcpy(buf, omip.s, omip.len);
        memcpy(buf + omip.len, oldip->s, oldip->len);
        memcpy(buf + omip.len + oldip->len, CRLF, CRLF_LEN);
        if (insert_new_lump_after(anchor, buf,
            omip.len + oldip->len + CRLF_LEN, 0) == NULL) {
            LOG(L_ERR, "ERROR: alter_mediaip: insert_new_lump_after failed\n");
            pkg_free(buf);
            return -1;
        }
    }

    if (oldpf == newpf) {
        nip.len = newip->len;
        nip.s = pkg_malloc(nip.len);
        if (nip.s == NULL) {
            LOG(L_ERR, "ERROR: alter_mediaip: out of memory\n");
            return -1;
        }
        memcpy(nip.s, newip->s, newip->len);
    } else {
        nip.len = newip->len + 2;
        nip.s = pkg_malloc(nip.len);
        if (nip.s == NULL) {
            LOG(L_ERR, "ERROR: alter_mediaip: out of memory\n");
            return -1;
        }
        memcpy(nip.s + 2, newip->s, newip->len);
        nip.s[0] = (newpf == AF_INET6) ? '6' : '4';
        nip.s[1] = ' ';
    }

    oip = *oldip;
    if (oldpf != newpf) {
        do {
            oip.s--;
            oip.len++;
        } while (*oip.s != '6' && *oip.s != '4');
    }
    offset = oip.s - msg->buf;
    anchor = del_lump(msg, offset, oip.len, 0);
    if (anchor == NULL) {
        LOG(L_ERR, "ERROR: alter_mediaip: del_lump failed\n");
        pkg_free(nip.s);
        return -1;
    }

#if 0
    msg->msg_flags |= FL_SDP_IP_AFS;
#endif

    if (insert_new_lump_after(anchor, nip.s, nip.len, 0) == 0) {
        LOG(L_ERR, "ERROR: alter_mediaip: insert_new_lump_after failed\n");
        pkg_free(nip.s);
        return -1;
    }
    return 0;
}

static int alter_mediaport	(	struct sip_msg *	msg,
		str *	body,
		str *	oldport,
		str *	newport,
		int	preserve
	)			[static]

Definition at line 452 of file sdp_util.c.

References AOLDMEDPRT, AOLDMEDPRT_LEN, and NULL.

Referenced by force_rtp_proxy2_f().

{
    char *buf;
    int offset;
    struct lump* anchor;

    /* check that updating mediaport is really necessary */
    if (newport->len == oldport->len &&
        memcmp(newport->s, oldport->s, newport->len) == 0)
        return 0;

    /*
     * Since rewriting the same info twice will mess SDP up,
     * apply simple anti foot shooting measure - put flag on
     * messages that have been altered and check it when
     * another request comes.
     */
#if 0
    /* disabled: - it propagates to the reply and we don't want this
     *  -- andrei */
    if (msg->msg_flags & FL_SDP_PORT_AFS) {
        LOG(L_ERR, "ERROR: alter_mediaip: you can't rewrite the same "
          "SDP twice, check your config!\n");
        return -1;
    }
#endif

    if (preserve != 0) {
        anchor = anchor_lump(msg, body->s + body->len - msg->buf, 0, 0);
        if (anchor == NULL) {
            LOG(L_ERR, "ERROR: alter_mediaport: anchor_lump failed\n");
            return -1;
        }
        buf = pkg_malloc(AOLDMEDPRT_LEN + oldport->len + CRLF_LEN);
        if (buf == NULL) {
            LOG(L_ERR, "ERROR: alter_mediaport: out of memory\n");
            return -1;
        }
        memcpy(buf, AOLDMEDPRT, AOLDMEDPRT_LEN);
        memcpy(buf + AOLDMEDPRT_LEN, oldport->s, oldport->len);
        memcpy(buf + AOLDMEDPRT_LEN + oldport->len, CRLF, CRLF_LEN);
        if (insert_new_lump_after(anchor, buf,
            AOLDMEDPRT_LEN + oldport->len + CRLF_LEN, 0) == NULL) {
            LOG(L_ERR, "ERROR: alter_mediaport: insert_new_lump_after failed\n");
            pkg_free(buf);
            return -1;
        }
    }

    buf = pkg_malloc(newport->len);
    if (buf == NULL) {
        LOG(L_ERR, "ERROR: alter_mediaport: out of memory\n");
        return -1;
    }
    offset = oldport->s - msg->buf;
    anchor = del_lump(msg, offset, oldport->len, 0);
    if (anchor == NULL) {
        LOG(L_ERR, "ERROR: alter_mediaport: del_lump failed\n");
        pkg_free(buf);
        return -1;
    }
    memcpy(buf, newport->s, newport->len);
    if (insert_new_lump_after(anchor, buf, newport->len, 0) == 0) {
        LOG(L_ERR, "ERROR: alter_mediaport: insert_new_lump_after failed\n");
        pkg_free(buf);
        return -1;
    }

#if 0
    msg->msg_flags |= FL_SDP_PORT_AFS;
#endif
    return 0;
}

static char* find_sdp_line	(	char *	p,
		char *	plimit,
		char	linechar
	)			[static]

Definition at line 527 of file sdp_util.c.

References NULL, and ser_memmem().

Referenced by find_next_sdp_line(), and force_rtp_proxy2_f().

{
    static char linehead[3] = "x=";
    char *cp, *cp1;
    linehead[0] = linechar;
    /* Iterate thru body */
    cp = p;
    for (;;) {
        if (cp >= plimit)
            return NULL;
        cp1 = ser_memmem(cp, linehead, plimit-cp, 2);
        if (cp1 == NULL)
            return NULL;
        /*
         * As it is body, we assume it has previous line and we can
         * lookup previous character.
         */
        if (cp1[-1] == '\n' || cp1[-1] == '\r')
            return cp1;
        /*
         * Having such data, but not at line beginning.
         * Skip them and reiterate. ser_memmem() will find next
         * occurence.
         */
        if (plimit - cp1 < 2)
            return NULL;
        cp = cp1 + 2;
    }
    /*UNREACHED*/
    return NULL;
}

static char* find_next_sdp_line	(	char *	p,
		char *	plimit,
		char	linechar,
		char *	defptr
	)			[static]

Definition at line 559 of file sdp_util.c.

References find_sdp_line().

Referenced by force_rtp_proxy2_f().

{
    char *t;
    if (p >= plimit || plimit - p < 3)
        return defptr;
    t = find_sdp_line(p + 2, plimit, linechar);
    return t ? t : defptr;
}

static int rfc1918address

(

str *

address

)

[inline, static]

Definition at line 568 of file sdp_util.c.

References network_t::cnetaddr, nets_1918, and NULL.

{
    struct in_addr inaddr;
    uint32_t netaddr;
    int i, result;
    char c;

    c = address->s[address->len];
    address->s[address->len] = 0;

    result = inet_aton(address->s, &inaddr);

    address->s[address->len] = c;

    if (result==0)
        return -1; /* invalid address to test */

    netaddr = ntohl(inaddr.s_addr);

    for (i=0; nets_1918[i].cnetaddr!=NULL; i++) {
        if ((netaddr & nets_1918[i].mask)==nets_1918[i].netaddr) {
            return 1;
        }
    }

    return 0;
}

static int get_to_tag	(	struct sip_msg *	_m,
		str *	_tag
	)			[inline, static]

Definition at line 599 of file sdp_util.c.

Referenced by force_rtp_proxy2_f(), and unforce_rtp_proxy_f().

{
    if (!_m->to) {
        LOG(L_ERR, "get_to_tag(): To header field missing\n");
        return -1;
    }

    if (get_to(_m)->tag_value.len) {
        _tag->s = get_to(_m)->tag_value.s;
        _tag->len = get_to(_m)->tag_value.len;
    } else {
        _tag->s = 0; /* fixes gcc 4.0 warnings */
        _tag->len = 0;
    }

    return 0;
}

static int get_from_tag	(	struct sip_msg *	_m,
		str *	_tag
	)			[inline, static]

Definition at line 620 of file sdp_util.c.

Referenced by force_rtp_proxy2_f(), and unforce_rtp_proxy_f().

{

    if (parse_from_header(_m) == -1) {
        LOG(L_ERR, "get_from_tag(): Error while parsing From header\n");
        return -1;
    }

    if (get_from(_m)->tag_value.len) {
        _tag->s = get_from(_m)->tag_value.s;
        _tag->len = get_from(_m)->tag_value.len;
    } else {
        _tag->len = 0;
    }

    return 0;
}

static int get_callid	(	struct sip_msg *	_m,
		str *	_cid
	)			[inline, static]

Definition at line 638 of file sdp_util.c.

References NULL.

Referenced by force_rtp_proxy2_f(), and unforce_rtp_proxy_f().

{

    if ((parse_headers(_m, HDR_CALLID_F, 0) == -1)) {
        LOG(L_ERR, "get_callid(): parse_headers() failed\n");
        return -1;
    }

    if (_m->callid == NULL) {
        LOG(L_ERR, "get_callid(): Call-ID not found\n");
        return -1;
    }

    _cid->s = _m->callid->body.s;
    _cid->len = _m->callid->body.len;
    trim(_cid);
    return 0;
}

static char* gencookie

(

)

[static]

Definition at line 657 of file sdp_util.c.

References myseqn.

Referenced by send_rtpp_command().

{
    static char cook[34];

    sprintf(cook, "%d_%u ", (int)getpid(), myseqn);
    myseqn++;
    return cook;
}

static char* send_rtpp_command	(	struct rtpp_node *	node,
		struct iovec *	v,
		int	vcnt
	)			[static]

Definition at line 666 of file sdp_util.c.

References AF_LOCAL, errno, gencookie(), NULL, out, rtpp_node::rn_address, rtpp_node::rn_disabled, rtpp_node::rn_fd, rtpp_node::rn_recheck_ticks, rtpp_node::rn_umode, rtpp_node::rn_url, rtpproxy_disable_tout, rtpproxy_retr, and rtpproxy_tout.

Referenced by force_rtp_proxy2_f(), rtpp_test(), and unforce_rtp_proxy_f().

{
    struct sockaddr_un addr;
    int fd, len, i;
    char *cp;
    static char buf[256];
    struct pollfd fds[1];

    len = 0;
    cp = buf;
    if (node->rn_umode == 0) {
        memset(&addr, 0, sizeof(addr));
        addr.sun_family = AF_LOCAL;
        strncpy(addr.sun_path, node->rn_address,
            sizeof(addr.sun_path) - 1);
#ifdef HAVE_SOCKADDR_SA_LEN
        addr.sun_len = strlen(addr.sun_path);
#endif

        fd = socket(AF_LOCAL, SOCK_STREAM, 0);
        if (fd < 0) {
            LOG(L_ERR, "ERROR: send_rtpp_command: can't create socket\n");
            goto badproxy;
        }
        if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
            close(fd);
            LOG(L_ERR, "ERROR: send_rtpp_command: can't connect to RTP proxy\n");
            goto badproxy;
        }

        do {
            len = writev(fd, v + 1, vcnt - 1);
        } while (len == -1 && errno == EINTR);
        if (len <= 0) {
            close(fd);
            LOG(L_ERR, "ERROR: send_rtpp_command: can't send command to a RTP proxy\n");
            goto badproxy;
        }
        do {
            len = read(fd, buf, sizeof(buf) - 1);
        } while (len == -1 && errno == EINTR);
        close(fd);
        if (len <= 0) {
            LOG(L_ERR, "ERROR: send_rtpp_command: can't read reply from a RTP proxy\n");
            goto badproxy;
        }
    } else {
        fds[0].fd = node->rn_fd;
        fds[0].events = POLLIN;
        fds[0].revents = 0;
        /* Drain input buffer */
        while ((poll(fds, 1, 0) == 1) &&
            ((fds[0].revents & POLLIN) != 0)) {
            recv(node->rn_fd, buf, sizeof(buf) - 1, 0);
            fds[0].revents = 0;
        }
        v[0].iov_base = gencookie();
        v[0].iov_len = strlen(v[0].iov_base);
        for (i = 0; i < rtpproxy_retr; i++) {
            do {
                len = writev(node->rn_fd, v, vcnt);
            } while (len == -1 && (errno == EINTR || errno == ENOBUFS));
            if (len <= 0) {
                LOG(L_ERR, "ERROR: send_rtpp_command: "
                    "can't send command to a RTP proxy\n");
                goto badproxy;
            }
            while ((poll(fds, 1, rtpproxy_tout * 1000) == 1) &&
                (fds[0].revents & POLLIN) != 0) {
                do {
                    len = recv(node->rn_fd, buf, sizeof(buf) - 1, 0);
                } while (len == -1 && errno == EINTR);
                if (len <= 0) {
                    LOG(L_ERR, "ERROR: send_rtpp_command: "
                        "can't read reply from a RTP proxy\n");
                    goto badproxy;
                }
                if (len >= (v[0].iov_len - 1) &&
                    memcmp(buf, v[0].iov_base, (v[0].iov_len - 1)) == 0) {
                    len -= (v[0].iov_len - 1);
                    cp += (v[0].iov_len - 1);
                    if (len != 0) {
                        len--;
                        cp++;
                    }
                    goto out;
                }
                fds[0].revents = 0;
            }
        }
        if (i == rtpproxy_retr) {
            LOG(L_ERR, "ERROR: send_rtpp_command: "
                "timeout waiting reply from a RTP proxy\n");
            goto badproxy;
        }
    }

out:
    cp[len] = '\0';
    return cp;
badproxy:
    LOG(L_ERR, "send_rtpp_command(): proxy <%s> does not responding, disable it\n", node->rn_url);
    node->rn_disabled = 1;
    node->rn_recheck_ticks = get_ticks() + rtpproxy_disable_tout;
    return NULL;
}

int rtpp_test	(	struct rtpp_node *	node,
		int	isdisabled,
		int	force
	)

Definition at line 774 of file sdp_util.c.

References NULL, REQ_CPROTOVER, rtpp_node::rn_recheck_ticks, rtpp_node::rn_url, rtpproxy_disable_tout, send_rtpp_command(), and SUP_CPROTOVER.

Referenced by rtpproxy_child_init(), and select_rtpp_node().

{
    int rtpp_ver;
    char *cp;
    struct iovec v[2] = {{NULL, 0}, {"V", 1}};
    struct iovec vf[4] = {{NULL, 0}, {"VF", 2}, {" ", 1},
        {REQ_CPROTOVER, 8}};

    if (force == 0) {
        if (isdisabled == 0)
            return 0;
        if (node->rn_recheck_ticks > get_ticks())
            return 1;
    }
    do {
        cp = send_rtpp_command(node, v, 2);
        if (cp == NULL) {
            LOG(L_WARN,"WARNING: rtpp_test: can't get version of "
                "the RTP proxy\n");
            break;
        }
        rtpp_ver = atoi(cp);
        if (rtpp_ver != SUP_CPROTOVER) {
            LOG(L_WARN, "WARNING: rtpp_test: unsupported "
                "version of RTP proxy <%s> found: %d supported, "
                "%d present\n", node->rn_url,
                SUP_CPROTOVER, rtpp_ver);
            break;
        }
        cp = send_rtpp_command(node, vf, 4);
        if (cp == NULL) {
            LOG(L_WARN,"WARNING: rtpp_test: RTP proxy went down during "
                "version query\n");
            break;
        }
        if (cp[0] == 'E' || atoi(cp) != 1) {
            LOG(L_WARN, "WARNING: rtpp_test: of RTP proxy <%s>"
                "doesn't support required protocol version %s\n",
                node->rn_url, REQ_CPROTOVER);
            break;
        }
        LOG(L_INFO, "rtpp_test: RTP proxy <%s> found, support for "
            "it %senabled\n",
            node->rn_url, force == 0 ? "re-" : "");
        return 0;
    } while(0);
    LOG(L_WARN, "WARNING: rtpp_test: support for RTP proxy <%s>"
        "has been disabled%s\n", node->rn_url,
        rtpproxy_disable_tout < 0 ? "" : " temporarily");
    if (rtpproxy_disable_tout >= 0)
        node->rn_recheck_ticks = get_ticks() + rtpproxy_disable_tout;

    return 1;
}

static struct rtpp_node* select_rtpp_node	(	str	callid,
		int	do_test,
		int	node_idx
	)			[static, read]

Definition at line 829 of file sdp_util.c.

References if, NULL, rtpp_node::rn_disabled, rtpp_head::rn_first, rtpp_node::rn_next, rtpp_node::rn_recheck_ticks, rtpp_node::rn_weight, rtpp_list, rtpp_node_count, and rtpp_test().

Referenced by force_rtp_proxy2_f(), and unforce_rtp_proxy_f().

{
    unsigned sum, sumcut, weight_sum;
    struct rtpp_node* node;
    int was_forced;

    /* Most popular case: 1 proxy, nothing to calculate */
    if (rtpp_node_count == 1) {
        if (node_idx > 0) {
            LOG(L_ERR, "ERROR: select_rtpp_node: node index out or range\n");
            return NULL;
        }
        node = rtpp_list.rn_first;
        if (node->rn_disabled && node->rn_recheck_ticks <= get_ticks()) {
            /* Try to enable if it's time to try. */
            node->rn_disabled = rtpp_test(node, 1, 0);
        }
        return node->rn_disabled ? NULL : node;
    }

    if (node_idx != -1) {
        for (node = rtpp_list.rn_first; node != NULL; node = node->rn_next) {
            if (node_idx > 0) {
                node_idx--;
                continue;
            }
            if (node->rn_disabled && node->rn_recheck_ticks <= get_ticks()) {
                /* Try to enable if it's time to try. */
                node->rn_disabled = rtpp_test(node, 1, 0);
            }
            return node->rn_disabled ? NULL : node;
        }
        LOG(L_ERR, "ERROR: select_rtpp_node: node index out or range\n");
        return NULL;
    }

    /* XXX Use quick-and-dirty hashing algo */
    for(sum = 0; callid.len > 0; callid.len--)
        sum += callid.s[callid.len - 1];
    sum &= 0xff;

    was_forced = 0;
retry:
    weight_sum = 0;
    for (node = rtpp_list.rn_first; node != NULL; node = node->rn_next) {
        if (node->rn_disabled && node->rn_recheck_ticks <= get_ticks()) {
            /* Try to enable if it's time to try. */
            node->rn_disabled = rtpp_test(node, 1, 0);
        }
        if (!node->rn_disabled)
            weight_sum += node->rn_weight;
    }
    if (weight_sum == 0) {
        /* No proxies? Force all to be redetected, if not yet */
        if (was_forced)
            return NULL;
        was_forced = 1;
        for (node = rtpp_list.rn_first; node != NULL; node = node->rn_next) {
            node->rn_disabled = rtpp_test(node, 1, 1);
        }
        goto retry;
    }
    sumcut = sum % weight_sum;
    /*
     * sumcut here lays from 0 to weight_sum-1.
     * Scan proxy list and decrease until appropriate proxy is found.
     */
    for (node = rtpp_list.rn_first; node != NULL; node = node->rn_next) {
        if (node->rn_disabled)
            continue;
        if (sumcut < node->rn_weight)
            goto found;
        sumcut -= node->rn_weight;
    }
    /* No node list */
    return NULL;
found:
    if (do_test) {
        node->rn_disabled = rtpp_test(node, node->rn_disabled, 0);
        if (node->rn_disabled)
            goto retry;
    }
    return node;
}

static int force_rtp_proxy2_f	(	struct sip_msg *	msg,
		char *	str1,
		char *	str2,
		int	had_sdp_in_invite
	)			[static]

Definition at line 916 of file sdp_util.c.

References alter_mediaip(), alter_mediaport(), ANORTPPROXY, ANORTPPROXY_LEN, extract_body(), extract_mediaip(), extract_mediaport(), find_next_sdp_line(), find_sdp_line(), get_callid(), get_from_tag(), get_to_tag(), isnulladdr(), NULL, select_rtpp_node(), send_rtpp_command(), ser_memmem(), and STR2IOVEC.

Referenced by P_SDP_manipulate().

{
    str body, body1, oldport, oldip, newport, newip;
    str callid, from_tag, to_tag, tmp;
    int create, port, len, asymmetric, flookup, argc, proxied, real;
    int oidx, pf=0, pf1, force, node_idx;
    char opts[16];
    char *cp, *cp1;
    char  *cpend, *next;
    char **ap, *argv[10];
    struct lump* anchor;
    struct rtpp_node *node;
    struct iovec v[14] = {
        {NULL, 0},  /* command */
        {NULL, 0},  /* options */
        {" ", 1},   /* separator */
        {NULL, 0},  /* callid */
        {" ", 1},   /* separator */
        {NULL, 7},  /* newip */
        {" ", 1},   /* separator */
        {NULL, 1},  /* oldport */
        {" ", 1},   /* separator */
        {NULL, 0},  /* from_tag */
        {";", 1},   /* separator */
        {NULL, 0},  /* medianum */
        {" ", 1},   /* separator */
        {NULL, 0}   /* to_tag */
    };
    char *v1p, *v2p, *c1p, *c2p, *m1p, *m2p, *bodylimit;
    char medianum_buf[20];
    int medianum, media_multi;
    str medianum_str, tmpstr1;
    int c1p_altered;

    v[1].iov_base=opts;
    asymmetric = flookup = force = real = 0;
    oidx = 1;
    node_idx = -1;
    for (cp = str1; *cp != '\0'; cp++) {
        switch (*cp) {
        case ' ':
        case '\t':
            break;

        case 'a':
        case 'A':
            opts[oidx++] = 'A';
            asymmetric = 1;
            real = 1;
            break;

        case 'i':
        case 'I':
            opts[oidx++] = 'I';
            break;

        case 'e':
        case 'E':
            opts[oidx++] = 'E';
            break;

        case 'l':
        case 'L':
            flookup = 1;
            break;

        case 'f':
        case 'F':
            force = 1;
            break;

        case 'r':
        case 'R':
            real = 1;
            break;

        case 'n':
        case 'N':
            cp++;
            for (len = 0; isdigit(cp[len]); len++)
                continue;
            if (len == 0) {
                LOG(L_ERR, "ERROR: force_rtp_proxy2: non-negative integer"
                    "should follow N option\n");
                return -1;
            }
            node_idx = strtoul(cp, NULL, 10);
            cp += len - 1;
            break;

        default:
            LOG(L_ERR, "ERROR: force_rtp_proxy2: unknown option `%c'\n", *cp);
            return -1;
        }
    }

    if (msg->first_line.type == SIP_REQUEST &&
        msg->first_line.u.request.method_value == METHOD_INVITE) {
        create = 1;
    } else if (msg->first_line.type == SIP_REPLY) {
        if (had_sdp_in_invite) create = 0;
        else create = 1; // this was actually the first SDP, so we need to create it;
    } else if (msg->first_line.type == SIP_REQUEST &&
        msg->first_line.u.request.method_value == METHOD_ACK) {
        create = 0;
    } else {
        return -1;
    }
    /* extract_body will also parse all the headers in the message as
     * a side effect => don't move get_callid/get_to_tag in front of it