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mtu_smpp_main.cpp
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mtu_smpp_main.cpp
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//
// mtu_smpp_main.cpp
// mlSMPPMTU
//
// Created by Mark Hay on 23/07/2023.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <time.h>
#include <sys/time.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <arpa/inet.h>
bool endserver = false;
uint64_t gMessageID = 1;
extern "C" int main_inner(int argc, char** argv);
void perror(char*str) { fprintf(stderr,"%s",str); }
int dolisten( int portno_in )
{
struct sockaddr_in serv_addr;
int listensockfd = socket(AF_INET, SOCK_STREAM, 0);
if (listensockfd < 0) { perror("ERROR opening socket"); return -1; }
int rc, on = 1;
rc = setsockopt(listensockfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
if (rc < 0) { perror("setsockopt() failed"); close(listensockfd); exit(-1); }
// Set socket to be nonblocking.
rc = ioctl(listensockfd, FIONBIO, (char *)&on);
if (rc < 0) { perror("ioctl() failed"); close(listensockfd); exit(-1); }
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno_in);
if (::bind(listensockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) { perror("ERROR on binding"); return -1; }
int r = listen(listensockfd,64);
printf("r=%d listensockfd=%d\n",r,listensockfd);
return listensockfd;
}
typedef struct stSMPPState {
bool empty, bound;
void reset(void) { empty = true; bound = false; }
} SMPPState;
SMPPState smppStates[64000];
void setUint32(uint8_t* buf,uint32_t v) {
buf[3] = v & 0xff;
buf[2] = (v>>8) & 0xff;
buf[1] = (v>>16) & 0xff;
buf[0] = (v>>24) & 0xff;
}
void sendSMPP(int s,int cmd,int status,int seqno,uint8_t* bufext=NULL,int extlen=0) {
uint8_t buf[16+extlen];
setUint32(buf,16+extlen);
setUint32(buf+4,cmd);
setUint32(buf+8,status);
setUint32(buf+12,seqno);
if (bufext!=NULL) memcpy(buf+16,bufext,extlen);
send(s,buf,16+extlen,0);
}
uint32_t getUint32(uint8_t* buf) {
return (((((buf[0]<<8)+buf[1])<<8)+buf[2])<<8)+buf[3];
}
typedef enum { COctetString, Integer, OctetString, NoMoreParams } SMPPTypes;
typedef struct {
SMPPTypes type;
char v_coctetstring[256];
int v_int;
uint8_t v_octetstring[256];
} SMPPTypeVals;
int parseSMPPPDU( uint8_t* buf, int len, SMPPTypes types[], SMPPTypeVals typevals[] ) {
int idx = 0;
int param = 0;
while (idx<len) {
if ( types[param] == NoMoreParams ) break;
typevals[param].type = types[param];
switch (types[param]) {
case COctetString: {
typevals[param].v_coctetstring[0] = '\0';
strcpy(typevals[param].v_coctetstring,(char*)(buf+idx));
idx += 1 + strlen(typevals[param].v_coctetstring);
break;
}
case Integer: {
typevals[param].v_int = buf[idx];
idx++;
break;
}
case OctetString: {
typevals[param].v_octetstring[0] = '\0';
strcpy((char*)typevals[param].v_octetstring,(char*)(buf+idx));
idx += 1 + strlen((char*)typevals[param].v_octetstring);
break;
}
}
param++;
}
/*for(int i=0;i<param;i++) {
printf("%2d: type(%d) co(%s) i(%d) o(%s)\n",
i,
typevals[i].type,
typevals[i].v_coctetstring,
typevals[i].v_int,
typevals[i].v_octetstring);
}*/
return param;
}
bool processSMPP(int s) {
uint8_t buf[1024];
long l = recv(s,buf,(int)sizeof(buf),0);
if (l<16) return true;
if (smppStates[s].empty) { smppStates[s].reset(); smppStates[s].empty = false; }
SMPPState& state = smppStates[s];
uint32_t len = getUint32(buf);
uint32_t cmd = getUint32(buf+4);
uint32_t status = getUint32(buf+8);
uint32_t seqno = getUint32(buf+12);
printf("SMPP [0x%x 0x%x 0x%x 0x%x] (%d)\n",len,cmd,status,seqno,s);
if ((cmd==0x00000001)||(cmd==0x00000002)||(cmd==0x00000009/*bind_transceiver*/)) {
if (state.bound) {
sendSMPP(s,cmd+0x80000000,0x00000005/*ESME_RALYBND*/,seqno);
return false;
}
state.bound = true;
char systemid[] = "mtu_smpp";
sendSMPP(s,cmd+0x80000000,0x00000000/*ESME_ROK*/,seqno,(uint8_t*)systemid,(int)(strlen(systemid)+1));
}
if (cmd==0x00000004/*submit_sm*/) {
/*
./mtu -d0 -m0x2d -u0x15 -p1 -g12080011047228190600 -a13010008001204448729600010 -i987654321 -s"@@@@@"
*/
SMPPTypes submitPDU[] = {COctetString,
Integer,Integer,COctetString,
Integer,Integer,COctetString,
Integer,
Integer,
Integer,
COctetString,
COctetString,
Integer,
Integer,
Integer,
Integer,
Integer,
OctetString,
NoMoreParams};
SMPPTypeVals submitParams[sizeof(submitPDU)];
int countParams = parseSMPPPDU(buf+16, (int) l-16, submitPDU, submitParams );
//
for(int i=0;i<countParams;i++) {
printf("%2d: type(%d) co(%s) i(%d) o(%s)\n",
i,
submitParams[i].type,
submitParams[i].v_coctetstring,
submitParams[i].v_int,
submitParams[i].v_octetstring);
}
//
// call "int main_inner(argc, argv)" in mtu_main_mod.c
char* n_argv[9];
n_argv[0] = "";
n_argv[1] = "-d0";
n_argv[2] = "-m0x2d";
n_argv[3] = "-u0x15";
n_argv[4] = "-p1";
n_argv[5] = "-g12080011047228190600";
n_argv[6] = "-a13010008001204448729600010";
n_argv[7] = "-i987654321";
n_argv[8] = "-s\"Hello world\"";
char n_argv_5[64]{0};
snprintf(n_argv_5,64,"-g%s",submitParams[3].v_coctetstring);
n_argv[5] = n_argv_5;
char n_argv_6[64]{0};
snprintf(n_argv_6,64,"-a%s",submitParams[6].v_coctetstring);
n_argv[6] = n_argv_6;
char n_argv_8[256]{0};
snprintf(n_argv_8,64,"-s\"%s\"",submitParams[17].v_octetstring);
n_argv[8] = n_argv_8;
main_inner(9,n_argv);
//
char messageid[32];
snprintf(messageid,32,"%08llx",gMessageID++);
sendSMPP(s,cmd+0x80000000,0x00000000/*ESME_ROK*/,seqno,(uint8_t*)messageid,(int)(strlen(messageid)+1));
}
return false;
}
int main(int argc, const char * argv[]) {
int listensockfdSMPP = dolisten(2775);
if (listensockfdSMPP == -1) { perror("Failed to listen on SMPP port"); return -1; }
int rc=0,i=0,desc_ready=0,new_sd=0,close_conn=0,max_sd=-1;
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 1000*5; // 5ms
fd_set master_set, working_set;
FD_ZERO(&master_set);
FD_SET(listensockfdSMPP, &master_set);
if (listensockfdSMPP > max_sd) max_sd = listensockfdSMPP;
do {
memcpy(&working_set, &master_set, sizeof(master_set));
rc = select(max_sd + 1, &working_set, NULL, NULL, &timeout);
if (rc < 0) { perror(" select() failed"); if (errno == EINTR) continue; break; }
if ((rc == 0 /* select() timed-out */)||(rc != 0)) {
if (rc==0) continue; /* select() timed-out */
}
desc_ready = rc;
for (i=0; i <= max_sd && desc_ready > 0; ++i) {
if (FD_ISSET(i, &working_set))
{
desc_ready -= 1;
if (i == listensockfdSMPP)
{
do
{
struct sockaddr_in client_addr;
int clen = sizeof(sockaddr_in);
new_sd = accept(listensockfdSMPP, (struct sockaddr *)&client_addr, (socklen_t*) &clen);
if (new_sd < 0)
{
if (errno != EWOULDBLOCK) { perror(" accept() failed (SMPP)"); if (errno != EMFILE) endserver = true; }
break;
}
char* ip = inet_ntoa(client_addr.sin_addr);
printf("New connection - %s (%d)\n",ip,new_sd);
FD_SET(new_sd, &master_set);
if (new_sd > max_sd) max_sd = new_sd;
} while (new_sd != -1);
}
else {
bool closed = processSMPP(i);
if (closed) { printf("%ld Closing connection - %d\n", time(NULL), i); close_conn = true; }
else close_conn = false;
if (close_conn)
{
smppStates[i].reset();
close(i);
FD_CLR(i, &master_set);
if (i == max_sd) { while (FD_ISSET(max_sd, &master_set) == false) max_sd -= 1; }
}
}
}
}
} while (!endserver);
close(listensockfdSMPP);
return 0;
}