X-Git-Url: http://git.linux-vserver.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=util-vserver%2Fsrc%2Frpm-fake-resolver.c;h=a89ee30e38318314ce9c9ab20bb3c7cc6eb18835;hb=a917f24ef7b003dcef54a3db2644cf9cb4bc2db2;hp=6af3c67279fadd5d3aa4166666f45f398be6c4e4;hpb=c3fec66a494a6b744a706700859b826da2f8bc4d;p=util-vserver.git diff --git a/util-vserver/src/rpm-fake-resolver.c b/util-vserver/src/rpm-fake-resolver.c index 6af3c67..a89ee30 100644 --- a/util-vserver/src/rpm-fake-resolver.c +++ b/util-vserver/src/rpm-fake-resolver.c @@ -16,6 +16,15 @@ // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +// Protocol: +// 1. startup +// 2. initialize (setuid, ctx-migrate, chroot, ...) +// 3. send "." token to fd 3 +// 4. wait one character on fd 1 +// 5. process this character and consume further characters from fd 1 as far +// as needed +// 6. go to 3) (or exit) + #ifdef HAVE_CONFIG_H # include #endif @@ -23,24 +32,31 @@ #include "internal.h" #include "vserver.h" #include "util.h" -#include "wrappers.h" -#include "wrappers-vserver.h" #include #include #include #include #include +#include +#include + +#define ENSC_WRAPPERS_PREFIX "rpm-fake-resolver: " +#define ENSC_WRAPPERS_VSERVER 1 +#define ENSC_WRAPPERS_UNISTD 1 +#define ENSC_WRAPPERS_FCNTL 1 +#include #define MAX_RQSIZE 0x1000 int wrapper_exit_code = 1; struct ArgInfo { - ctx_t ctx; + xid_t ctx; uid_t uid; gid_t gid; bool do_fork; + bool in_ctx; char const * pid_file; char const * chroot; }; @@ -58,7 +74,7 @@ showHelp(int fd, char const *cmd, int res) WRITE_MSG(fd, "Usage: "); WRITE_STR(fd, cmd); WRITE_MSG(fd, - " [-c ] [-u ] [-g ] [-r ] [-n]\n" + " [-c ] [-u ] [-g ] [-r ] [-s] [-n]\n" "Please report bugs to " PACKAGE_BUGREPORT "\n"); exit(res); } @@ -79,7 +95,7 @@ inline static void parseArgs(struct ArgInfo *args, int argc, char *argv[]) { while (1) { - int c = getopt_long(argc, argv, "c:u:g:r:n", CMDLINE_OPTIONS, 0); + int c = getopt_long(argc, argv, "c:u:g:r:ns", CMDLINE_OPTIONS, 0); if (c==-1) break; switch (c) { @@ -91,6 +107,7 @@ parseArgs(struct ArgInfo *args, int argc, char *argv[]) case 'g' : args->gid = atoi(optarg); break; case 'r' : args->chroot = optarg; break; case 'n' : args->do_fork = false; break; + case 's' : args->in_ctx = true; break; default : WRITE_MSG(2, "Try '"); WRITE_STR(2, argv[0]); @@ -182,7 +199,7 @@ run() uint8_t c; while (true) { - Ewrite(2, ".", 1); + Ewrite(3, ".", 1); Eread (0, &c, sizeof c); switch (c) { case 'P' : do_getpwnam(); break; @@ -198,7 +215,13 @@ run() static void daemonize(struct ArgInfo const UNUSED * args, int pid_fd) { - pid_t pid = Efork(); + int p[2]; + pid_t pid; + char c; + + Epipe(p); + pid = Efork(); + if (pid!=0) { if (pid_fd!=-1) { char buf[sizeof(id_t)*3 + 2]; @@ -210,29 +233,62 @@ daemonize(struct ArgInfo const UNUSED * args, int pid_fd) } _exit(0); } + Eclose(p[1]); + read(p[0], &c, 1); + Eclose(p[0]); +} + +static void +activateContext(xid_t xid, bool in_ctx) +{ + if (in_ctx) { + struct vc_ctx_flags flags = { + .flagword = 0, + .mask = VC_VXF_STATE_SETUP, + }; + + Evc_set_flags(xid, &flags); + } + else if (vc_isSupported(vcFEATURE_MIGRATE)) + Evc_migrate_context(xid); + else { +#ifdef VC_ENABLE_API_COMPAT + Evc_new_s_context(xid, 0, S_CTX_INFO_LOCK); +#else + WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "can not change context: migrate kernel feature missing and 'compat' API disabled\n"); + exit(wrapper_exit_code); +#endif + } } int main(int argc, char * argv[]) { struct ArgInfo args = { - .ctx = VC_RANDCTX, + .ctx = VC_DYNAMIC_XID, .uid = 99, .gid = 99, - .do_fork = false, + .do_fork = true, .pid_file = 0, - .chroot = 0 + .chroot = 0, + .in_ctx = false, }; int pid_fd = -1; +#ifndef __dietlibc__ +# warning *** rpm-fake-resolver is built against glibc; please do not report errors before trying a dietlibc version *** + WRITE_MSG(2, + "*** rpm-fake-resolver was built with glibc; please do ***\n" + "*** not report errors before trying a dietlibc version. ***\n"); +#endif + parseArgs(&args, argc, argv); if (args.pid_file && args.do_fork) - pid_fd = Eopen(args.pid_file, O_CREAT|O_WRONLY, 0644); + pid_fd = EopenD(args.pid_file, O_CREAT|O_WRONLY, 0644); if (args.chroot) Echroot(args.chroot); Echdir("/"); - //Evc_new_s_context(args.ctx, ~(VC_CAP_SETGID|VC_CAP_SETUID), S_CTX_INFO_LOCK); - Evc_new_s_context(args.ctx, 0, S_CTX_INFO_LOCK); + activateContext(args.ctx, args.in_ctx); Esetgroups(0, &args.gid); Esetgid(args.gid); Esetuid(args.uid);