X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=pppd%2Fmain.c;h=eec19c760398d598ca9eb8e7650f295db0d9101a;hb=8d95b4cae82fe429d2988b3d95d37325e65ea5ad;hp=1ad46a6b8ca3aa50c5da1b1af0d4ec8d6bf90f11;hpb=4f5d76ea5ee24f8833b5205d33a259d2c0c31cc6;p=ppp.git diff --git a/pppd/main.c b/pppd/main.c index 1ad46a6..eec19c7 100644 --- a/pppd/main.c +++ b/pppd/main.c @@ -18,7 +18,7 @@ */ #ifndef lint -static char rcsid[] = "$Id: main.c,v 1.43 1997/11/27 06:09:20 paulus Exp $"; +static char rcsid[] = "$Id: main.c,v 1.46 1998/03/26 04:46:04 paulus Exp $"; #endif #include @@ -40,7 +40,6 @@ static char rcsid[] = "$Id: main.c,v 1.43 1997/11/27 06:09:20 paulus Exp $"; #include #include #include -#include #include "pppd.h" #include "magic.h" @@ -69,7 +68,7 @@ extern char *strerror(); #endif /* interface vars */ -char ifname[IFNAMSIZ]; /* Interface name */ +char ifname[32]; /* Interface name */ int ifunit; /* Interface unit number */ char *progname; /* Name of this program */ @@ -86,11 +85,14 @@ int baud_rate; /* Actual bits/second for serial device */ int hungup; /* terminal has been hung up */ int privileged; /* we're running as real uid root */ int need_holdoff; /* need holdoff period before restarting */ +int detached; /* have detached from terminal */ int phase; /* where the link is at */ int kill_link; int open_ccp_flag; -int redirect_stderr; /* Connector's stderr should go to file */ + +char **script_env; /* Env. variable values for scripts */ +int s_env_nalloc; /* # words avail at script_env */ u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ @@ -170,6 +172,7 @@ main(argc, argv) sigset_t mask; struct protent *protp; struct stat statbuf; + char numbuf[16]; phase = PHASE_INITIALIZE; p = ttyname(0); @@ -177,6 +180,8 @@ main(argc, argv) strcpy(devnam, p); strcpy(default_devnam, devnam); + script_env = NULL; + /* Initialize syslog facilities */ #ifdef ULTRIX openlog("pppd", LOG_PID); @@ -193,6 +198,8 @@ main(argc, argv) uid = getuid(); privileged = uid == 0; + sprintf(numbuf, "%d", uid); + script_setenv("UID", numbuf); /* * Initialize to the standard option set, then parse, in order, @@ -201,7 +208,7 @@ main(argc, argv) */ for (i = 0; (protp = protocols[i]) != NULL; ++i) (*protp->init)(0); - + progname = *argv; if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) @@ -239,13 +246,18 @@ main(argc, argv) exit(1); } + script_setenv("DEVICE", devnam); + sprintf(numbuf, "%d", baud_rate); + script_setenv("SPEED", numbuf); + /* * If the user has specified the default device name explicitly, * pretend they hadn't. */ if (!default_device && strcmp(devnam, default_devnam) == 0) default_device = 1; - redirect_stderr = !nodetach || default_device; + if (default_device) + nodetach = 1; /* * Initialize system-dependent stuff and magic number package. @@ -259,10 +271,8 @@ main(argc, argv) * Detach ourselves from the terminal, if required, * and identify who is running us. */ - if (!default_device && !nodetach && daemon(0, 0) < 0) { - perror("Couldn't detach from controlling terminal"); - exit(1); - } + if (nodetach == 0) + detach(); pid = getpid(); p = getlogin(); if (p == NULL) { @@ -361,6 +371,7 @@ main(argc, argv) syslog(LOG_INFO, "Using interface ppp%d", ifunit); (void) sprintf(ifname, "ppp%d", ifunit); + script_setenv("IFNAME", ifname); /* write pid to file */ (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname); @@ -509,7 +520,8 @@ main(argc, argv) syslog(LOG_INFO, "Using interface ppp%d", ifunit); (void) sprintf(ifname, "ppp%d", ifunit); - + script_setenv("IFNAME", ifname); + /* write pid to file */ (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname); if ((pidfile = fopen(pidfilename, "w")) != NULL) { @@ -611,6 +623,21 @@ main(argc, argv) return 0; } +/* + * detach - detach us from the controlling terminal. + */ +void +detach() +{ + if (detached) + return; + if (daemon(0, 0) < 0) { + perror("Couldn't detach from controlling terminal"); + die(1); + } + detached = 1; +} + /* * holdoff_end - called via a timeout when the holdoff period ends. */ @@ -1055,9 +1082,9 @@ device_script(program, in, out) close(out); } } - if (redirect_stderr) { + if (nodetach == 0) { close(2); - errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644); + errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); if (errfd >= 0 && errfd != 2) { dup2(errfd, 2); close(errfd); @@ -1096,7 +1123,6 @@ run_program(prog, args, must_exist) int must_exist; { int pid; - char *nullenv[1]; pid = fork(); if (pid == -1) { @@ -1141,8 +1167,7 @@ run_program(prog, args, must_exist) /* SysV recommends a second fork at this point. */ /* run the program; give it a null environment */ - nullenv[0] = NULL; - execve(prog, args, nullenv); + execve(prog, args, script_env); if (must_exist || errno != ENOENT) syslog(LOG_WARNING, "Can't execute %s: %m", prog); _exit(-1); @@ -1567,3 +1592,78 @@ vfmtmsg(buf, buflen, fmt, args) *buf = 0; return buf - buf0; } + +/* + * script_setenv - set an environment variable value to be used + * for scripts that we run (e.g. ip-up, auth-up, etc.) + */ +void +script_setenv(var, value) + char *var, *value; +{ + int vl = strlen(var); + int i; + char *p, *newstring; + + newstring = (char *) malloc(vl + strlen(value) + 2); + if (newstring == 0) + return; + strcpy(newstring, var); + newstring[vl] = '='; + strcpy(newstring+vl+1, value); + + /* check if this variable is already set */ + if (script_env != 0) { + for (i = 0; (p = script_env[i]) != 0; ++i) { + if (strncmp(p, var, vl) == 0 && p[vl] == '=') { + free(p); + script_env[i] = newstring; + return; + } + } + } else { + i = 0; + script_env = (char **) malloc(16 * sizeof(char *)); + if (script_env == 0) + return; + s_env_nalloc = 16; + } + + /* reallocate script_env with more space if needed */ + if (i + 1 >= s_env_nalloc) { + int new_n = i + 17; + char **newenv = (char **) realloc((void *)script_env, + new_n * sizeof(char *)); + if (newenv == 0) + return; + script_env = newenv; + s_env_nalloc = new_n; + } + + script_env[i] = newstring; + script_env[i+1] = 0; +} + +/* + * script_unsetenv - remove a variable from the environment + * for scripts. + */ +void +script_unsetenv(var) + char *var; +{ + int vl = strlen(var); + int i; + char *p; + + if (script_env == 0) + return; + for (i = 0; (p = script_env[i]) != 0; ++i) { + if (strncmp(p, var, vl) == 0 && p[vl] == '=') { + free(p); + while ((script_env[i] = script_env[i+1]) != 0) + ++i; + break; + } + } +}