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-rw-r--r--tests/helpers/test_mkfds.c775
1 files changed, 775 insertions, 0 deletions
diff --git a/tests/helpers/test_mkfds.c b/tests/helpers/test_mkfds.c
new file mode 100644
index 0000000..12b814f
--- /dev/null
+++ b/tests/helpers/test_mkfds.c
@@ -0,0 +1,775 @@
+/*
+ * test_lsfd - make various file descriptors
+ *
+ * Written by Masatake YAMATO <yamato@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include "c.h"
+#include "nls.h"
+#include "xalloc.h"
+
+#define _U_ __attribute__((__unused__))
+
+static void __attribute__((__noreturn__)) usage(FILE *out, int status)
+{
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %s [options] FACTORY FD... [PARAM=VAL...]\n"), program_invocation_short_name);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -l, --list list available file descriptor factories and exit\n"), out);
+ fputs(_(" -I, --parameters <factory> list parameters the factory takes\n"), out);
+ fputs(_(" -r, --comm <name> rename self\n"), out);
+ fputs(_(" -q, --quiet don't print pid(s)\n"), out);
+ fputs(_(" -c, --dont-pause don't pause after making fd(s)\n"), out);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Examples:\n"), out);
+ fprintf(out, _("Using 3, open /etc/group:\n\n $ %s ro-regular-file 3 file=/etc/group\n\n"),
+ program_invocation_short_name);
+ fprintf(out, _("Using 3 and 4, make a pipe:\n\n $ %s pipe-no-fork 3 4\n\n"),
+ program_invocation_short_name);
+
+ exit(status);
+}
+
+union value {
+ const char *string;
+ long integer;
+};
+
+enum ptype {
+ PTYPE_STRING,
+ PTYPE_INTEGER,
+};
+
+struct ptype_class {
+ const char *name;
+
+ /* Covert to a string representation.
+ * A caller must free the returned value with free(3) after using. */
+ char *(*sprint)(const union value *value);
+
+ /* Convert from a string. If ARG is NULL, use DEFV instead.
+ * A caller must free the returned value with the free method
+ * after using. */
+ union value (*read)(const char *arg, const union value *defv);
+
+ /* Free the value returned from the read method. */
+ void (*free)(union value value);
+};
+
+#define ARG_STRING(A) (A.v.string)
+#define ARG_INTEGER(A) (A.v.integer)
+struct arg {
+ union value v;
+ void (*free)(union value value);
+};
+
+struct parameter {
+ const char *name;
+ const enum ptype type;
+ const char *desc;
+ union value defv; /* Default value */
+};
+
+static char *string_sprint(const union value *value)
+{
+ return xstrdup(value->string);
+}
+
+static union value string_read(const char *arg, const union value *defv)
+{
+ return (union value){ .string = xstrdup(arg?: defv->string) };
+}
+
+static void string_free(union value value)
+{
+ free((void *)value.string);
+}
+
+static char *integer_sprint(const union value *value)
+{
+ char *str = NULL;
+ xasprintf(&str, "%ld", value->integer);
+ return str;
+}
+
+static union value integer_read(const char *arg, const union value *defv)
+{
+ char *ep;
+ union value r;
+
+ if (!arg)
+ return *defv;
+
+ errno = 0;
+ r.integer = strtol(arg, &ep, 10);
+ if (errno)
+ err(EXIT_FAILURE, _("fail to make a number from %s"), arg);
+ else if (*ep != '\0')
+ errx(EXIT_FAILURE, _("garbage at the end of number: %s"), arg);
+ return r;
+}
+
+static void integer_free(union value value _U_)
+{
+ /* Do nothing */
+}
+
+
+struct ptype_class ptype_classes [] = {
+ [PTYPE_STRING] = {
+ .name = "string",
+ .sprint = string_sprint,
+ .read = string_read,
+ .free = string_free,
+ },
+ [PTYPE_INTEGER] = {
+ .name = "integer",
+ .sprint = integer_sprint,
+ .read = integer_read,
+ .free = integer_free,
+ },
+};
+
+static struct arg decode_arg(const char *pname,
+ const struct parameter *parameters,
+ int argc, char **argv)
+{
+ char *v = NULL;
+ size_t len = strlen(pname);
+ const struct parameter *p = NULL;
+ struct arg arg;
+
+ while (parameters->name) {
+ if (strcmp(pname, parameters->name) == 0) {
+ p = parameters;
+ break;
+ }
+ parameters++;
+ }
+ if (p == NULL)
+ errx(EXIT_FAILURE, _("no such parameter: %s"), pname);
+
+ for (int i = 0; i < argc; i++) {
+ if (strncmp(pname, argv[i], len) == 0) {
+ v = argv[i] + len;
+ if (*v == '=') {
+ v++;
+ break;
+ } else if (*v == '\0')
+ errx(EXIT_FAILURE,
+ _("no value given for \"%s\" parameter"),
+ pname);
+ else
+ v = NULL;
+ }
+ }
+ arg.v = ptype_classes [p->type].read (v, &p->defv);
+ arg.free = ptype_classes [p->type].free;
+ return arg;
+}
+
+static void free_arg(struct arg *arg)
+{
+ arg->free(arg->v);
+}
+
+struct fdesc {
+ int fd;
+ void (*close)(int, void *);
+ void *data;
+};
+
+struct factory {
+ const char *name; /* [-a-zA-Z0-9_]+ */
+ const char *desc;
+ bool priv; /* the root privilege is needed to make fd(s) */
+#define MAX_N 3
+ int N; /* the number of fds this factory makes */
+ bool fork; /* whether this factory make a child process or not */
+ void (*make)(const struct factory *, struct fdesc[], pid_t *, int, char **);
+ const struct parameter * params;
+};
+
+static void close_fdesc(int fd, void *data _U_)
+{
+ close(fd);
+}
+
+static void open_ro_regular_file(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ struct arg file = decode_arg("file", factory->params, argc, argv);
+ struct arg offset = decode_arg("offset", factory->params, argc, argv);
+
+ int fd = open(ARG_STRING(file), O_RDONLY);
+ if (fd < 0)
+ err(EXIT_FAILURE, "failed to open: %s", ARG_STRING(file));
+ free_arg(&file);
+
+ if (ARG_INTEGER(offset) != 0) {
+ if (lseek(fd, (off_t)ARG_INTEGER(offset), SEEK_CUR) < 0) {
+ int e = errno;
+ close(fd);
+ errno = e;
+ err(EXIT_FAILURE, "failed to seek 0 -> %ld", ARG_INTEGER(offset));
+ }
+ }
+ free_arg(&offset);
+
+ if (fd != fdescs[0].fd) {
+ if (dup2(fd, fdescs[0].fd) < 0) {
+ int e = errno;
+ close(fd);
+ errno = e;
+ err(EXIT_FAILURE, "failed to dup %d -> %d", fd, fdescs[0].fd);
+ }
+ close(fd);
+ }
+
+ fdescs[0] = (struct fdesc){
+ .fd = fdescs[0].fd,
+ .close = close_fdesc,
+ .data = NULL
+ };
+}
+
+static void make_pipe(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ int pd[2];
+ int nonblock_flags[2] = {0, 0};
+ struct arg nonblock = decode_arg("nonblock", factory->params, argc, argv);
+ if (strlen(ARG_STRING(nonblock)) != 2) {
+ errx(EXIT_FAILURE, "string value for %s has unexpected length: %s",
+ "nonblock", ARG_STRING(nonblock));
+ }
+
+ for (int i = 0; i < 2; i++) {
+ if (ARG_STRING(nonblock)[i] == '-')
+ continue;
+ if ((i == 0 && ARG_STRING(nonblock)[i] == 'r')
+ || (i == 1 && ARG_STRING(nonblock)[i] == 'w'))
+ nonblock_flags[i] = 1;
+ else
+ errx(EXIT_FAILURE, "unexpected value %c for the %s fd of %s",
+ ARG_STRING(nonblock)[i],
+ (i == 0)? "read": "write",
+ "nonblock");
+ }
+ free_arg(&nonblock);
+
+ if (pipe(pd) < 0)
+ err(EXIT_FAILURE, "failed to make pipe");
+
+ for (int i = 0; i < 2; i++) {
+ if (nonblock_flags[i]) {
+ int flags = fcntl(pd[i], F_GETFL);
+ if (fcntl(pd[i], F_SETFL, flags|O_NONBLOCK) < 0) {
+ int e = errno;
+ close(pd[0]);
+ close(pd[1]);
+ errno = e;
+ errx(EXIT_FAILURE, "failed to set NONBLOCK flag to the %s fd",
+ (i == 0)? "read": "write");
+ }
+ }
+ }
+
+ for (int i = 0; i < 2; i++) {
+ if (pd[i] != fdescs[i].fd) {
+ if (dup2(pd[i], fdescs[i].fd) < 0) {
+ int e = errno;
+ close(pd[0]);
+ close(pd[1]);
+ errno = e;
+ err(EXIT_FAILURE, "failed to dup %d -> %d",
+ pd[i], fdescs[i].fd);
+ }
+ close(pd[i]);
+ }
+ fdescs[i] = (struct fdesc){
+ .fd = fdescs[i].fd,
+ .close = close_fdesc,
+ .data = NULL
+ };
+ }
+}
+
+static void close_dir(int fd, void *data)
+{
+ DIR *dp = data;
+ if (dp)
+ closedir(dp);
+ else
+ close_fdesc(fd, NULL);
+}
+
+static void open_directory(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ struct arg dir = decode_arg("dir", factory->params, argc, argv);
+ struct arg dentries = decode_arg("dentries", factory->params, argc, argv);
+ DIR *dp = NULL;
+
+ int fd = open(ARG_STRING(dir), O_RDONLY|O_DIRECTORY);
+ if (fd < 0)
+ err(EXIT_FAILURE, "failed to open: %s", ARG_STRING(dir));
+ free_arg(&dir);
+
+ if (fd != fdescs[0].fd) {
+ if (dup2(fd, fdescs[0].fd) < 0) {
+ int e = errno;
+ close(fd);
+ errno = e;
+ err(EXIT_FAILURE, "failed to dup %d -> %d", fd, fdescs[0].fd);
+ }
+ close(fd);
+ }
+
+ if (ARG_INTEGER(dentries) > 0) {
+ dp = fdopendir(fdescs[0].fd);
+ if (dp == NULL) {
+ int e = errno;
+ close(fdescs[0].fd);
+ errno = e;
+ err(EXIT_FAILURE, "failed to make DIR* from fd: %s", ARG_STRING(dir));
+ }
+ for (int i = 0; i < ARG_INTEGER(dentries); i++) {
+ struct dirent *d = readdir(dp);
+ if (!d) {
+ int e = errno;
+ closedir(dp);
+ errno = e;
+ err(EXIT_FAILURE, "failed in readdir(3)");
+ }
+ }
+ }
+ free_arg(&dentries);
+
+
+ fdescs[0] = (struct fdesc){
+ .fd = fdescs[0].fd,
+ .close = close_dir,
+ .data = dp
+ };
+}
+
+static void open_rw_chrdev(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ struct arg chrdev = decode_arg("chrdev", factory->params, argc, argv);
+ int fd = open(ARG_STRING(chrdev), O_RDWR);
+ if (fd < 0)
+ err(EXIT_FAILURE, "failed to open: %s", ARG_STRING(chrdev));
+ free_arg(&chrdev);
+
+ fdescs[0] = (struct fdesc){
+ .fd = fd,
+ .close = close_fdesc,
+ .data = NULL
+ };
+}
+
+static void make_socketpair(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ int sd[2];
+ struct arg socktype = decode_arg("socktype", factory->params, argc, argv);
+ int isocktype;
+ if (strcmp(ARG_STRING(socktype), "STREAM") == 0)
+ isocktype = SOCK_STREAM;
+ else if (strcmp(ARG_STRING(socktype), "DGRAM") == 0)
+ isocktype = SOCK_DGRAM;
+ else if (strcmp(ARG_STRING(socktype), "SEQPACKET") == 0)
+ isocktype = SOCK_SEQPACKET;
+ else
+ errx(EXIT_FAILURE,
+ "unknown socket type for socketpair(AF_UNIX,...): %s",
+ ARG_STRING(socktype));
+ free_arg(&socktype);
+
+ if (socketpair(AF_UNIX, isocktype, 0, sd) < 0)
+ err(EXIT_FAILURE, "failed to make socket pair");
+
+ for (int i = 0; i < 2; i++) {
+ if (sd[i] != fdescs[i].fd) {
+ if (dup2(sd[i], fdescs[i].fd) < 0) {
+ int e = errno;
+ close(sd[0]);
+ close(sd[1]);
+ errno = e;
+ err(EXIT_FAILURE, "failed to dup %d -> %d",
+ sd[i], fdescs[i].fd);
+ }
+ close(sd[i]);
+ }
+ fdescs[i] = (struct fdesc){
+ .fd = fdescs[i].fd,
+ .close = close_fdesc,
+ .data = NULL
+ };
+ }
+}
+
+static void open_with_opath(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ struct arg path = decode_arg("path", factory->params, argc, argv);
+ int fd = open(ARG_STRING(path), O_PATH|O_NOFOLLOW);
+ if (fd < 0)
+ err(EXIT_FAILURE, "failed to open with O_PATH: %s", ARG_STRING(path));
+ free_arg(&path);
+
+ fdescs[0] = (struct fdesc){
+ .fd = fd,
+ .close = close_fdesc,
+ .data = NULL
+ };
+}
+
+static void open_ro_blkdev(const struct factory *factory, struct fdesc fdescs[], pid_t * child _U_,
+ int argc, char ** argv)
+{
+ struct arg blkdev = decode_arg("blkdev", factory->params, argc, argv);
+ int fd = open(ARG_STRING(blkdev), O_RDONLY);
+ if (fd < 0)
+ err(EXIT_FAILURE, "failed to open: %s", ARG_STRING(blkdev));
+ free_arg(&blkdev);
+
+ fdescs[0] = (struct fdesc){
+ .fd = fd,
+ .close = close_fdesc,
+ .data = NULL,
+ };
+}
+
+#define PARAM_END { .name = NULL, }
+static const struct factory factories[] = {
+ {
+ .name = "ro-regular-file",
+ .desc = "read-only regular file",
+ .priv = false,
+ .N = 1,
+ .fork = false,
+ .make = open_ro_regular_file,
+ .params = (struct parameter []) {
+ {
+ .name = "file",
+ .type = PTYPE_STRING,
+ .desc = "file to be opened",
+ .defv.string = "/etc/passwd",
+ },
+ {
+ .name = "offset",
+ .type = PTYPE_INTEGER,
+ .desc = "seek bytes after open with SEEK_CUR",
+ .defv.integer = 0,
+ },
+ PARAM_END
+ },
+ },
+ {
+ .name = "pipe-no-fork",
+ .desc = "making pair of fds with pipe(2)",
+ .priv = false,
+ .N = 2,
+ .fork = false,
+ .make = make_pipe,
+ .params = (struct parameter []) {
+ {
+ .name = "nonblock",
+ .type = PTYPE_STRING,
+ .desc = "set nonblock flag (\"--\", \"r-\", \"-w\", or \"rw\")",
+ .defv.string = "--",
+ },
+ PARAM_END
+ },
+ },
+ {
+ .name = "directory",
+ .desc = "directory",
+ .priv = false,
+ .N = 1,
+ .fork = false,
+ .make = open_directory,
+ .params = (struct parameter []) {
+ {
+ .name = "dir",
+ .type = PTYPE_STRING,
+ .desc = "directory to be opened",
+ .defv.string = "/",
+ },
+ {
+ .name = "dentries",
+ .type = PTYPE_INTEGER,
+ .desc = "read the number of dentries after open with readdir(3)",
+ .defv.integer = 0,
+ },
+ PARAM_END
+ },
+ },
+ {
+ .name = "rw-character-device",
+ .desc = "character device with O_RDWR flag",
+ .priv = false,
+ .N = 1,
+ .fork = false,
+ .make = open_rw_chrdev,
+ .params = (struct parameter []) {
+ {
+ .name = "chrdev",
+ .type = PTYPE_STRING,
+ .desc = "character device node to be opened",
+ .defv.string = "/dev/zero",
+ },
+ PARAM_END
+ },
+ },
+ {
+ .name = "socketpair",
+ .desc = "AF_UNIX socket pair created with socketpair(2)",
+ .priv = false,
+ .N = 2,
+ .fork = false,
+ .make = make_socketpair,
+ .params = (struct parameter []) {
+ {
+ .name = "socktype",
+ .type = PTYPE_STRING,
+ .desc = "STREAM, DGRAM, or SEQPACKET",
+ .defv.string = "STREAM",
+ },
+ PARAM_END
+ },
+ },
+ {
+ .name = "symlink",
+ .desc = "symbolic link itself opened with O_PATH",
+ .priv = false,
+ .N = 1,
+ .fork = false,
+ .make = open_with_opath,
+ .params = (struct parameter []) {
+ {
+ .name = "path",
+ .type = PTYPE_STRING,
+ .desc = "path to a symbolic link",
+ .defv.string = "/dev/stdin",
+ },
+ PARAM_END
+ },
+ },
+ {
+ .name = "ro-block-device",
+ .desc = "block device with O_RDONLY flag",
+ .priv = true,
+ .N = 1,
+ .fork = false,
+ .make = open_ro_blkdev,
+ .params = (struct parameter []) {
+ {
+ .name = "blkdev",
+ .type = PTYPE_STRING,
+ .desc = "block device node to be opened",
+ .defv.string = "/dev/nullb0",
+ },
+ PARAM_END
+ },
+ },
+};
+
+static int count_parameters(const struct factory *factory)
+{
+
+ const struct parameter *p = factory->params;
+ if (!p)
+ return 0;
+ while (p->name)
+ p++;
+ return p - factory->params;
+}
+
+static void print_factory(const struct factory *factory)
+{
+ printf("%-20s %4s %5d %4s %6d %s\n",
+ factory->name,
+ factory->priv? "yes": "no",
+ factory->N,
+ factory->fork? "yes": "no",
+ count_parameters(factory),
+ factory->desc);
+}
+
+static void list_factories(void)
+{
+ printf("%-20s PRIV COUNT FORK NPARAM DESCRIPTION\n", "FACTORY");
+ for (size_t i = 0; i < ARRAY_SIZE(factories); i++)
+ print_factory(factories + i);
+}
+
+static const struct factory *find_factory(const char *name)
+{
+ for (size_t i = 0; i < ARRAY_SIZE(factories); i++)
+ if (strcmp(factories[i].name, name) == 0)
+ return factories + i;
+ return NULL;
+}
+
+static void list_parameters(const char *factory_name)
+{
+ const struct factory *factory = find_factory(factory_name);
+ const char *fmt = "%-15s %-8s %15s %s\n";
+
+ if (!factory)
+ errx(EXIT_FAILURE, _("no such factory: %s"), factory_name);
+
+ if (!factory->params)
+ return;
+
+ printf(fmt, "PARAMETER", "TYPE", "DEFAULT_VALUE", "DESCRIPTION");
+ for (const struct parameter *p = factory->params; p->name != NULL; p++) {
+ char *defv = ptype_classes[p->type].sprint(&p->defv);
+ printf(fmt, p->name, ptype_classes[p->type].name, defv, p->desc);
+ free(defv);
+ }
+}
+
+static void rename_self(const char *comm)
+{
+ if (prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0) < 0)
+ err(EXIT_FAILURE, _("failed to rename self via prctl: %s"), comm);
+}
+
+static void do_nothing(int signum _U_)
+{
+}
+
+int main(int argc, char **argv)
+{
+ int c;
+ pid_t pid[2];
+ const struct factory *factory;
+ struct fdesc fdescs[MAX_N];
+ bool quiet = false;
+ bool cont = false;
+
+ pid[0] = getpid();
+ pid[1] = -1;
+
+ static const struct option longopts[] = {
+ { "list", no_argument, NULL, 'l' },
+ { "parameters", required_argument, NULL, 'I' },
+ { "comm", required_argument, NULL, 'r' },
+ { "quiet", no_argument, NULL, 'q' },
+ { "dont-puase", no_argument, NULL, 'c' },
+ { "help", no_argument, NULL, 'h' },
+ };
+
+ while ((c = getopt_long(argc, argv, "lhqcI:r:", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'h':
+ usage(stdout, EXIT_SUCCESS);
+ case 'l':
+ list_factories();
+ exit(EXIT_SUCCESS);
+ case 'I':
+ list_parameters(optarg);
+ exit(EXIT_SUCCESS);
+ case 'q':
+ quiet = true;
+ break;
+ case 'c':
+ cont = true;
+ break;
+ case 'r':
+ rename_self(optarg);
+ break;
+ default:
+ usage(stderr, EXIT_FAILURE);
+ }
+ }
+
+
+ if (optind == argc)
+ errx(EXIT_FAILURE, _("no file descriptor specification given"));
+
+ factory = find_factory(argv[optind]);
+ if (!factory)
+ errx(EXIT_FAILURE, _("no such factory: %s"), argv[optind]);
+ assert(factory->N < MAX_N);
+ optind++;
+
+ if ((optind + factory->N) > argc)
+ errx(EXIT_FAILURE, _("not enough file descriptors given for %s"),
+ factory->name);
+ for (int i = 0; i < factory->N; i++) {
+ char *str = argv[optind + i];
+ long fd;
+ char *ep;
+
+ errno = 0;
+ fd = strtol(str, &ep, 10);
+ if (errno)
+ err(EXIT_FAILURE, "failed to convert fd number: %s", str);
+ if (ep == str)
+ errx(EXIT_FAILURE, "failed to convert fd number: %s", str);
+ if (*ep != '\0')
+ errx(EXIT_FAILURE, _("garbage at the end of number: %s"), str);
+ if (fd < 0)
+ errx(EXIT_FAILURE, "fd number should not be negative: %s", str);
+ if (fd < 3)
+ errx(EXIT_FAILURE, "fd 0, 1, 2 are reserved: %s", str);
+ fdescs[i].fd = fd;
+ }
+ optind += factory->N;
+
+ factory->make(factory, fdescs, pid + 1, argc - optind, argv + optind);
+
+ signal(SIGCONT, do_nothing);
+
+ if (!quiet) {
+ printf("%d", pid[0]);
+ if (pid[1] != -1)
+ printf(" %d", pid[1]);
+ putchar('\n');
+ fflush(stdout);
+ }
+
+ if (!cont)
+ pause();
+
+ for (int i = 0; i < factory->N; i++)
+ fdescs[i].close(fdescs[i].fd, fdescs[i].data);
+
+ exit(EXIT_SUCCESS);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-18 01:12:37 +0000