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tests/LTsock.c
890 строк
21 KB
Jiajie Chen
[darwin] Fallback to localhost in LTsock
14 янв 2023, 06:52
14 янв 2023, 06:52
9bb3e71
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/* * LTsock.c -- Lsof Test IPv4 sockets * * V. Abell * Purdue University */ /* * Copyright 2002 Purdue Research Foundation, West Lafayette, Indiana * 47907. All rights reserved. * * Written by V. Abell. * * This software is not subject to any license of the American Telephone * and Telegraph Company or the Regents of the University of California. * * Permission is granted to anyone to use this software for any purpose on * any computer system, and to alter it and redistribute it freely, subject * to the following restrictions: * * 1. Neither the authors nor Purdue University are responsible for any * consequences of the use of this software. * * 2. The origin of this software must not be misrepresented, either by * explicit claim or by omission. Credit to the authors and Purdue * University must appear in documentation and sources. * * 3. Altered versions must be plainly marked as such, and must not be * misrepresented as being the original software. * * 4. This notice may not be removed or altered. */ #ifndef lint static char copyright[] = "@(#) Copyright 2002 Purdue Research Foundation.\nAll rights reserved.\n"; #endif #include "LsofTest.h" #include "lsof_fields.h" #include <netdb.h> #include <signal.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> /* * Pre-definitions that make be changed or revoked by dialects */ #define SIGHANDLER_T void /* signal handler function type */ #define LT_SOCKLEN_T int /* socket length type */ #if defined(LT_DIAL_aix) /* * AIX-specific items */ #undef LT_SOCKLEN_T #define LT_SOCKLEN_T size_t #endif /* defined(LT_DIAL_aix) */ #if defined(LT_DIAL_darwin) /* * Darwin-specific items */ # if LT_VERS>=800 #undef LT_SOCKLEN_T #define LT_SOCKLEN_T socklen_t # endif /* LT_VERS>=800 */ #endif /* defined(LT_DIAL_darwin) */ #if defined(LT_DIAL_freebsd) /* * FreeBSD-specific items */ #undef LT_SOCKLEN_T #define LT_SOCKLEN_T socklen_t #endif /* defined(LT_DIAL_freebsd) */ #if defined(LT_DIAL_hpux) /* * HP-UX-specific items */ # if LT_VERS>=1123 && defined(__GNUC__) #undef LT_SOCKLEN_T #define LT_SOCKLEN_T size_t # endif /* LT_VERS>=1123 && defined(__GNUC__) */ #endif /* defined(LT_DIAL_hpux) */ #if defined(LT_DIAL_ou) /* * OpenUNIX-specific items */ #undef LT_SOCKLEN_T #define LT_SOCKLEN_T size_t #endif /* defined(LT_DIAL_ou) */ #if defined(LT_DIAL_uw) /* * UnixWare-specific items */ #undef LT_SOCKLEN_T #define LT_SOCKLEN_T size_t #endif /* defined(LT_DIAL_uw) */ /* * Local definitions */ #define ALARMTM 30 /* alarm timer */ #define LT_CLNT 0 /* child process index */ #define LT_SRVR 1 /* parent process index */ #define LT_FNF 0 /* file not found */ #define LT_FBYIP 1 /* file found by IP address */ #define LT_FBYHN 2 /* file found by host name */ #define LT_FBYPORT 4 /* file found by port */ #if !defined(MAXHOSTNAMELEN) #define MAXHOSTNAMELEN 256 /* maximum host name length */ #endif /* !defined(MAXHOSTNAMELEN) */ #if !defined(MAXPATHLEN) #define MAXPATHLEN 1024 /* maximum path length */ #endif /* !defined(MAXPATHLEN) */ /* * Local structure definitions. */ typedef struct fdpara { /* file descriptor parameters */ int fd; /* FD */ char *fds; /* FD in ASCII */ int ff; /* file found flags (see LT_F*) */ char *host; /* host name */ int hlen; /* strlen(host) */ char *ipaddr; /* dotted IP address */ int ilen; /* strlen(ipaddr) */ pid_t pid; /* PID of process */ char *port; /* port in ASCII */ int plen; /* strlen(port) */ struct sockaddr_in sa; /* socket's address */ } fdpara_t; /* * Globals */ pid_t CPid = (pid_t)0; /* client PID */ fdpara_t FdPara[2]; /* file descriptor parameters */ #define NFDPARA (sizeof(FdPara) /sizeof(fdpara_t)) struct sockaddr_in Myad; /* my (server) socket address */ pid_t MyPid = (pid_t)0; /* PID of this process */ char *Pn = (char *)NULL; /* program name */ char *PtNm[] = { "client", "server" }; /* program type name */ int Ssock = -1; /* server socket */ /* * Local function prototypes */ _PROTOTYPE(static void CleanupClnt,(void)); _PROTOTYPE(static void CleanupSrvr,(void)); _PROTOTYPE(static SIGHANDLER_T HandleClntAlarm,(int sig)); _PROTOTYPE(static SIGHANDLER_T HandleSrvrAlarm,(int sig)); _PROTOTYPE(static char *FindSock,(int fn)); _PROTOTYPE(static void StartClnt,(struct sockaddr_in *cad)); /* * Main program */ int main(argc, argv) int argc; /* argument count */ char *argv[]; /* arguments */ { struct sockaddr_in aa; /* accept address */ struct sockaddr_in ba; /* bind address */ char buf[2048]; /* temporary buffer */ int bufl = sizeof(buf); /* size of buf[] */ struct sockaddr_in ca; /* connect address */ char *cem; /* current error message pointer */ char *ep; /* error message parameter */ char hnm[MAXHOSTNAMELEN + 1]; /* this host's name */ char *host; /* host name */ struct hostent *hp; /* this host's hostent structure */ char *ipaddr; /* IP address */ char *pem = (char *)NULL; /* previous error message */ char *port; /* port */ LT_SOCKLEN_T sal; /* socket address length */ char *tcp; /* temporary character size */ int ti, tj, tk; /* temporary indexes */ int tsfd; /* temporary socket FD */ int xv = 0; /* exit value */ /* * Get program name and PID, issue start message, and build space prefix. */ if ((Pn = strrchr(argv[0], '/'))) Pn++; else Pn = argv[0]; MyPid = getpid(); (void) printf("%s ... ", Pn); (void) fflush(stdout); PrtMsg((char *)NULL, Pn); /* * Initalize the FdPara[] array before any CleanupClnt() call. */ for (ti = 0; ti < NFDPARA; ti++) { (void) memset((void *)&FdPara[ti], 0, sizeof(fdpara_t)); FdPara[ti].fd = -1; FdPara[ti].ff = LT_FNF; } /* * Process arguments. */ if (ScanArg(argc, argv, "h", Pn)) xv = 1; if (xv || LTopt_h) { (void) PrtMsg("usage: [-h]", Pn); PrtMsgX(" -h print help (this panel)", Pn, CleanupSrvr, xv); } /* * See if lsof can be executed and can access kernel memory. */ if ((cem = IsLsofExec())) (void) PrtMsgX(cem, Pn, CleanupSrvr, 1); if ((cem = CanRdKmem())) (void) PrtMsgX(cem, Pn, CleanupSrvr, 1); /* * Get the host name and its IP address. Convert the IP address to dotted * ASCII form. */ if (gethostname(hnm, sizeof(hnm) - 1)) { cem = "ERROR!!! can't get this host's name"; goto print_errno; } hnm[sizeof(hnm) - 1] = '\0'; if (!(hp = gethostbyname(hnm))) { // fallback to localhost if hostname cannot be resolved strcpy(hnm, "localhost"); if (!(hp = gethostbyname(hnm))) { (void) snprintf(buf, bufl - 1, "ERROR!!! can't get IP address for %s", hnm); buf[bufl - 1] = '\0'; cem = buf; goto print_errno; } } (void) memset((void *)&Myad, 0, sizeof(Myad)); if ((ti = hp->h_length) > sizeof(Myad.sin_addr)) ti = sizeof(Myad.sin_addr); (void) memcpy((void *)&Myad.sin_addr, (void *)hp->h_addr, ti); Myad.sin_family = hp->h_addrtype; /* * Get INET domain socket FDs. */ for (ti = 0; ti < NFDPARA; ti++) { if ((tsfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { ep = "socket"; print_errno_by_ti: /* * Report socket function error. * * Entry: ep = function name * hnm = this host's name * Myad = this host's IP address * ti = FdPara[] index */ (void) snprintf(buf, bufl - 1, "ERROR!!! %s %s() failure", PtNm[ti], ep); buf[bufl - 1] = '\0'; PrtMsg(buf, Pn); (void) snprintf(buf, bufl - 1, " host: %s", FdPara[ti].host ? FdPara[ti].host : hnm); buf[bufl - 1] = '\0'; PrtMsg(buf, Pn); (void) snprintf(buf, bufl - 1, " IP: %s", FdPara[ti].ipaddr ? FdPara[ti].ipaddr : inet_ntoa(Myad.sin_addr)); buf[bufl - 1] = '\0'; cem = buf; print_errno: /* * Report errno. * * Entry: errno = error number */ PrtMsg(cem, Pn); (void) snprintf(buf, bufl - 1, " Errno %d: %s", errno, strerror(errno)); buf[bufl - 1] = '\0'; PrtMsgX(buf, Pn, CleanupSrvr, 1); } /* * Put the FD just acquired in FdPara[ti].fd. * * Set the file-not-found to LT_FNF. * * Save the server socket if this FdPara[] is for it. */ FdPara[ti].fd = tsfd; (void) snprintf(buf, bufl - 1, "%d", tsfd); buf[bufl - 1] = '\0'; FdPara[ti].fds = MkStrCpy(buf, &tj); if (ti == LT_SRVR) Ssock = tsfd; } /* * Bind the host name to the server socket. * * Get and save the server's socket address. * * Initiate a listen with an address list of one. */ (void) memcpy((void *)&ba, (void *)&Myad, sizeof(ba)); ti = LT_SRVR; FdPara[ti].pid = MyPid; if (bind(Ssock, (struct sockaddr *)&ba, sizeof(ba)) < 0) { ep = "bind"; goto print_errno_by_ti; } sal = (LT_SOCKLEN_T)sizeof(ca); if (getsockname(Ssock, (struct sockaddr *)&ca, &sal)) { ep = "getsockname"; goto print_errno_by_ti; } (void) memcpy((void *)&FdPara[ti].sa, (void *)&ca, sizeof(FdPara[ti].sa)); if (listen(Ssock, 1) < 0) { ep = "listen"; goto print_errno_by_ti; } /* * Fork a child process to run as the client. */ switch ((CPid = (pid_t)fork())) { case (pid_t)0: /* * This is the child. Start the client. */ StartClnt(&ca); (void) PrtMsgX("ERROR!!! unexpected client return", Pn, CleanupSrvr, 1); case (pid_t)-1: /* * This is a fork error. */ cem = "ERROR!!! fork() error"; goto print_errno; default: /* * This is the parent. * * Save the client's PID. * * Close the client's socket. */ FdPara[LT_CLNT].pid = CPid; if (FdPara[LT_CLNT].fd >= 0) { (void) close(FdPara[LT_CLNT].fd); FdPara[LT_CLNT].fd = -1; } } /* * Set a SIGALRM, then accept() the connection from the client. * * Save the client's socket address. * * Replace the server's FD with the accepted one and close the original. */ sal = (LT_SOCKLEN_T)sizeof(aa); (void) alarm(0); (void) signal(SIGALRM, HandleSrvrAlarm); (void) alarm(ALARMTM); tsfd = FdPara[LT_SRVR].fd = accept(Ssock, (struct sockaddr *)&aa, &sal); (void) alarm(0); (void) signal(SIGALRM, SIG_DFL); if (tsfd < 0) { ep = "accept"; goto print_errno_by_ti; } (void) snprintf(buf, bufl - 1, "%d", tsfd); buf[bufl - 1] = '\0'; if (FdPara[LT_SRVR].fds) (void) free((void *)FdPara[LT_SRVR].fds); FdPara[LT_SRVR].fds = MkStrCpy(buf, &tj); ti = LT_CLNT; (void) memcpy((void *)&FdPara[ti].sa, (void *)&aa, sizeof(FdPara[ti].sa)); (void) close(Ssock); Ssock = -1; /* * Convert the client and server IP address to ASCII form. * * Look up the client and server host names for their IP addresses. * * Convert the port from the socket address to host form. */ for (ti = 0; ti < NFDPARA; ti++) { tcp = inet_ntoa(FdPara[ti].sa.sin_addr); FdPara[ti].ipaddr = MkStrCpy(tcp, &FdPara[ti].ilen); (void) snprintf(buf, bufl - 1, "%d", (int)ntohs(FdPara[ti].sa.sin_port)); buf[bufl - 1] = '\0'; FdPara[ti].port = MkStrCpy(buf, &FdPara[ti].plen); if (!(hp = gethostbyaddr((char *)&FdPara[ti].sa.sin_addr, sizeof(FdPara[ti].sa.sin_addr), FdPara[ti].sa.sin_family)) ) { ep = "gethostbyaddr"; goto print_errno_by_ti; } if (hp->h_name) FdPara[ti].host = MkStrCpy(hp->h_name, &FdPara[ti].hlen); else { /* * The connected client's socket address can't be mapped to a host * name. */ (void) snprintf(buf, bufl - 1, "ERROR!!! can't map %s (client) to a host name", FdPara[ti].ipaddr); buf[bufl - 1] = '\0'; PrtMsgX(buf, Pn, CleanupSrvr, 1); } } /* * Call lsof three times to find the two sockets: 1) by host name and port; * 2) by IP address and port; and 3) by port. */ if ((cem = FindSock(LT_FBYHN))) PrtMsgX(cem, Pn, CleanupSrvr, 1); if ((cem = FindSock(LT_FBYIP))) PrtMsgX(cem, Pn, CleanupSrvr, 1); if ((cem = FindSock(LT_FBYPORT))) PrtMsgX(cem, Pn, CleanupSrvr, 1); /* * Check the FindSock() results. */ for (pem = (char *)NULL, ti = 0; ti < NFDPARA; ti++) { if ((tj = FdPara[ti].ff) != (LT_FBYHN | LT_FBYIP | LT_FBYPORT)) { host = FdPara[ti].host; ipaddr = FdPara[ti].ipaddr; port = FdPara[ti].port; /* * This FD wasn't found by some search method. */ if (!(tj & LT_FBYHN)) { /* * The search by host name and port failed. */ (void) snprintf(buf, bufl - 1, "ERROR!!! no %s socket by host and port: %s@%s", PtNm[ti], host, port); buf[bufl - 1] = '\0'; if (pem) (void) PrtMsg(pem, Pn); pem = MkStrCpy(buf, &tk); } if (!(tj & LT_FBYIP)) { /* * The search by IP address and port failed. */ (void) snprintf(buf, bufl - 1, "ERROR!!! no %s socket by IP and port: %s@%s", PtNm[ti], ipaddr, port); buf[bufl - 1] = '\0'; if (pem) (void) PrtMsg(pem, Pn); pem = MkStrCpy(buf, &tk); } if (!(tj & LT_FBYPORT)) { /* * The search by port number failed. */ (void) snprintf(buf, bufl - 1, "ERROR!!! no %s socket by port: %s", PtNm[ti], port); buf[bufl - 1] = '\0'; if (pem) (void) PrtMsg(pem, Pn); pem = MkStrCpy(buf, &tk); } } } if (pem) (void) PrtMsgX(pem, Pn, CleanupSrvr, 1); /* * Exit successfully. */ (void) PrtMsgX("OK", Pn, CleanupSrvr, 0); return(0); } /* * ClntCleanup() -- release client resources */ static void CleanupClnt() { int tfd; /* temporary file descriptor */ if ((tfd = FdPara[LT_CLNT].fd) >= 0) { (void) shutdown(tfd, 2); (void) close(tfd); FdPara[LT_CLNT].fd = -1; } } /* * CleanupSrvr() -- release server resources */ static void CleanupSrvr() { int tfd; /* temporary file descriptor */ int ti; /* temporary index */ pid_t wpid; /* wait() PID */ if ((Ssock >= 0) && (Ssock != FdPara[LT_SRVR].fd)) { (void) shutdown(Ssock, 2); (void) close(Ssock); Ssock = -1; } for (ti = 0; ti < NFDPARA; ti++) { if ((tfd = FdPara[ti].fd) >= 0) { (void) shutdown(tfd, 2); (void) close(tfd); FdPara[ti].fd = -1; } } if (CPid > 0) { wpid = wait3(NULL, WNOHANG, NULL); if (wpid != CPid) { kill(CPid, SIGKILL); (void) wait3(NULL, WNOHANG, NULL); } CPid = (pid_t)0; } } /* * FindSock() -- find sockets with lsof */ static char * FindSock(fn) int fn; /* function -- an LT_FBY* value */ { char buf[2048]; /* temporary buffer */ int bufl = sizeof(buf); /* size of buf[] */ char *cem; /* current error message pointer */ LTfldo_t *cmdp; /* command pointer */ LTfldo_t *fop; /* field output pointer */ int nf; /* number of fields */ int nl; /* name length */ LTfldo_t *nmp; /* name pointer */ char *opv[5]; /* option vector for ExecLsof() */ char *pem = (char *)NULL; /* previous error message pointer */ pid_t pid; /* PID */ int pids = 0; /* PID found status */ int pl; /* port length */ int px; /* process index -- LT_CLNT or * LT_SRVR */ char *tcp, *tcp1; /* temporary character pointers */ int ti, tj; /* temporary integers */ LTfldo_t *typ; /* file type pointer */ /* * Check the function and determine the first lsof option from it. */ ti = 0; switch (fn) { case LT_FBYHN: opv[ti++] = "-P"; for (tj = 0; tj < NFDPARA; tj++) { (void) snprintf(buf, bufl - 1, "-i@%s:%s", FdPara[tj].host, FdPara[tj].port); buf[bufl - 1] = '\0'; opv[ti++] = MkStrCpy(buf, &pl); } break; case LT_FBYIP: opv[ti++] = "-Pn"; for (tj = 0; tj < NFDPARA; tj++) { (void) snprintf(buf, bufl - 1, "-i@%s:%s", FdPara[tj].ipaddr, FdPara[tj].port); buf[bufl - 1] = '\0'; opv[ti++] = MkStrCpy(buf, &pl); } break; case LT_FBYPORT: opv[ti++] = "-P"; for (tj = 0; tj < NFDPARA; tj++) { (void) snprintf(buf, bufl - 1, "-i:%s", FdPara[tj].port); buf[bufl - 1] = '\0'; opv[ti++] = MkStrCpy(buf, &pl); } break; default: (void) snprintf(buf, bufl - 1, "ERROR!!! illegal FindSock() function: %d", fn); buf[bufl - 1] = '\0'; return(MkStrCpy(buf, &ti)); } /* * Complete the option vector and start lsof execution. */ #if defined(USE_LSOF_C_OPT) opv[ti++] = "-C"; #endif /* defined(USE_LSOF_C_OPT) */ opv[ti] = (char *)NULL; if ((cem = ExecLsof(opv))) return(cem); /* * Read lsof output. */ while ((((FdPara[LT_CLNT].ff & fn) == 0) || ((FdPara[LT_SRVR].ff & fn) == 0)) && (fop = RdFrLsof(&nf, &cem)) ) { if (cem) { if (pem) (void) PrtMsg(pem, Pn); return(cem); } switch (fop->ft) { case LSOF_FID_PID: /* * This is a process information line. */ pid = (pid_t)atoi(fop->v); pids = 1; cmdp = (LTfldo_t *)NULL; for (fop++, ti = 1; ti < nf; fop++, ti++) { switch (fop->ft) { case LSOF_FID_CMD: cmdp = fop; break; } } if (!cmdp || ((pid != CPid) && (pid != MyPid))) pids = 0; break; case LSOF_FID_FD: /* * This is a file descriptor line. * * Identify the process -- client or server. */ if (!pids) break; if (pid == CPid) px = LT_CLNT; else if (pid == MyPid) px = LT_SRVR; else break; /* * Make sure the FD matches the identified process. */ if (strcmp(fop->v, FdPara[px].fds)) break; /* * Scan for name and type. */ nmp = typ = (LTfldo_t *)NULL; for (fop++, ti = 1; ti < nf; fop++, ti++) { switch (fop->ft) { case LSOF_FID_NAME: nmp = fop; break; case LSOF_FID_TYPE: typ = fop; break; } } /* * Check the type of the file. */ if (!typ || (strcasecmp(typ->v, "inet") && strcasecmp(typ->v, "ipv4")) ) { break; } /* * Check the addess in the name, based on the calling function. */ if (!nmp) break; tcp = nmp->v; switch (fn) { case LT_FBYHN: if (((nl = FdPara[px].hlen) <= 0) || !(tcp1 = FdPara[px].host) || strncasecmp(tcp, tcp1, nl) ) { break; } tcp += nl; if ((*tcp++ != ':') || !(tcp1 = FdPara[px].port) || ((pl = FdPara[px].plen) <= 0) || strncmp(tcp, tcp1, pl) ) { break; } tcp += pl; if ((*tcp == '-') || (*tcp == ' ') || !*tcp) { FdPara[px].ff |= LT_FBYHN; } break; case LT_FBYIP: if (((nl = FdPara[px].ilen) <= 0) || !(tcp1 = FdPara[px].ipaddr) || strncasecmp(tcp, tcp1, nl) ) { break; } tcp += nl; if ((*tcp++ != ':') || !(tcp1 = FdPara[px].port) || ((pl = FdPara[px].plen) <= 0) || strncmp(tcp, tcp1, pl) ) { break; } tcp += pl; if ((*tcp == '-') || (*tcp == ' ') || !*tcp) { FdPara[px].ff |= LT_FBYIP; } break; case LT_FBYPORT: if (!(tcp = strchr(tcp, ':'))) break; tcp++; if (!(tcp1 = FdPara[px].port) || ((pl = FdPara[px].plen) <= 0) || strncmp(tcp, tcp1, pl) ) { break; } tcp += pl; if ((*tcp == '-') || (*tcp == ' ') || !*tcp) { FdPara[px].ff |= LT_FBYPORT; } break; } } } /* * Clean up and return. */ (void) StopLsof(); return(pem); } /* * HandleClntAlarm() -- handle client alarm */ static SIGHANDLER_T HandleClntAlarm(sig) int sig; /* the signal (SIGALRM) */ { (void) PrtMsgX("ERROR!!! client caught an alarm signal", Pn, CleanupClnt, 1); } /* * Handle SrvrAlarm() -- handle server alarm */ static SIGHANDLER_T HandleSrvrAlarm(sig) int sig; /* the signal (SIGALRM) */ { (void) PrtMsgX("ERROR!!! server caught an alarm signal.", Pn, CleanupSrvr, 1); } /* * StartClnt() -- start network client */ static void StartClnt(cad) struct sockaddr_in *cad; /* connection address */ { struct sockaddr_in ba; /* bind address */ int br; /* bytes read */ char buf[2048]; /* temporary buffer */ int bufl = sizeof(buf); /* size of buf[] */ int cr; /* connect() reply */ char *em; /* error message pointer */ int fd = FdPara[LT_CLNT].fd; /* client's socket FD */ /* * Close the server's sockets. */ if ((Ssock >= 0) && (Ssock != FdPara[LT_SRVR].fd)) { (void) close(Ssock); Ssock = -1; } if (FdPara[LT_SRVR].fd >= 0) { (void) close(FdPara[LT_SRVR].fd); FdPara[LT_SRVR].fd = -1; } /* * Bind to the local address. */ (void) memcpy((void *)&ba, (void *)&Myad, sizeof(ba)); if (bind(fd, (struct sockaddr *)&ba, sizeof(ba)) < 0) { em = "bind"; client_errno: (void) snprintf(buf, bufl - 1, "ERROR!!! client %s error: %s", em, strerror(errno)); buf[bufl - 1] = '\0'; (void) PrtMsgX(em, Pn, CleanupClnt, 1); } /* * Set an alarm timeout and connect to the server. */ (void) signal(SIGALRM, HandleClntAlarm); (void) alarm(ALARMTM); cr = connect(fd, (struct sockaddr *)cad, sizeof(struct sockaddr_in)); (void) alarm(0); (void) signal(SIGALRM, SIG_DFL); if (cr) { em = "connect"; goto client_errno; } /* * Sleep until the socket closes or the parent kills the process. */ for (br = 0; br >= 0;) { sleep(1); br = read(fd, buf, bufl); } (void) CleanupClnt(); exit(0); }